[PATCH v6 0/4] KVM statistics data fd-based binary interface

[PATCH v6 0/4] KVM statistics data fd-based binary interface

[Jing Zhang]

This patchset provides a file descriptor for every VM and VCPU to read
KVM statistics data in binary format.
It is meant to provide a lightweight, flexible, scalable and efficient
lock-free solution for user space telemetry applications to pull the
statistics data periodically for large scale systems. The pulling
frequency could be as high as a few times per second.
In this patchset, every statistics data are treated to have some
attributes as below:
  * architecture dependent or common
  * VM statistics data or VCPU statistics data
  * type: cumulative, instantaneous,
  * unit: none for simple counter, nanosecond, microsecond,
    millisecond, second, Byte, KiByte, MiByte, GiByte. Clock Cycles
Since no lock/synchronization is used, the consistency between all
the statistics data is not guaranteed. That means not all statistics
data are read out at the exact same time, since the statistics date
are still being updated by KVM subsystems while they are read out.

---

* v5 -> v6
  - Use designated initializers for STATS_DESC
  - Change KVM_STATS_SCALE... to KVM_STATS_BASE...
  - Use a common function for kvm_[vm|vcpu]_stats_read
  - Fix some documentation errors/missings
  - Use TEST_ASSERT in selftest
  - Use a common function for [vm|vcpu]_stats_test in selftest

* v4 -> v5
  - Rebase to kvm/queue, commit a4345a7cecfb ("Merge tag
    'kvmarm-fixes-5.13-1'")
  - Change maximum stats name length to 48
  - Replace VM_STATS_COMMON/VCPU_STATS_COMMON macros with stats
    descriptor definition macros.
  - Fixed some errors/warnings reported by checkpatch.pl

* v3 -> v4
  - Rebase to kvm/queue, commit 9f242010c3b4 ("KVM: avoid "deadlock"
    between install_new_memslots and MMU notifier")
  - Use C-stype comments in the whole patch
  - Fix wrong count for x86 VCPU stats descriptors
  - Fix KVM stats data size counting and validity check in selftest

* v2 -> v3
  - Rebase to kvm/queue, commit edf408f5257b ("KVM: avoid "deadlock"
    between install_new_memslots and MMU notifier")
  - Resolve some nitpicks about format

* v1 -> v2
  - Use ARRAY_SIZE to count the number of stats descriptors
  - Fix missing `size` field initialization in macro STATS_DESC

[1] https://lore.kernel.org/kvm/20210402224359.2297157-1-jingzhangos@google.com
[2] https://lore.kernel.org/kvm/20210415151741.1607806-1-jingzhangos@google.com
[3] https://lore.kernel.org/kvm/20210423181727.596466-1-jingzhangos@google.com
[4] https://lore.kernel.org/kvm/20210429203740.1935629-1-jingzhangos@google.com
[5] https://lore.kernel.org/kvm/20210517145314.157626-1-jingzhangos@google.com

---

Jing Zhang (4):
  KVM: stats: Separate common stats from architecture specific ones
  KVM: stats: Add fd-based API to read binary stats data
  KVM: stats: Add documentation for statistics data binary interface
  KVM: selftests: Add selftest for KVM statistics data binary interface

 Documentation/virt/kvm/api.rst                | 179 +++++++++++++++
 arch/arm64/include/asm/kvm_host.h             |   9 +-
 arch/arm64/kvm/guest.c                        |  38 ++-
 arch/mips/include/asm/kvm_host.h              |   9 +-
 arch/mips/kvm/mips.c                          |  64 +++++-
 arch/powerpc/include/asm/kvm_host.h           |   9 +-
 arch/powerpc/kvm/book3s.c                     |  64 +++++-
 arch/powerpc/kvm/book3s_hv.c                  |  12 +-
 arch/powerpc/kvm/book3s_pr.c                  |   2 +-
 arch/powerpc/kvm/book3s_pr_papr.c             |   2 +-
 arch/powerpc/kvm/booke.c                      |  59 ++++-
 arch/s390/include/asm/kvm_host.h              |   9 +-
 arch/s390/kvm/kvm-s390.c                      | 129 ++++++++++-
 arch/x86/include/asm/kvm_host.h               |   9 +-
 arch/x86/kvm/x86.c                            |  67 +++++-
 include/linux/kvm_host.h                      | 141 +++++++++++-
 include/linux/kvm_types.h                     |  12 +
 include/uapi/linux/kvm.h                      |  50 ++++
 tools/testing/selftests/kvm/.gitignore        |   1 +
 tools/testing/selftests/kvm/Makefile          |   3 +
 .../testing/selftests/kvm/include/kvm_util.h  |   3 +
 .../selftests/kvm/kvm_bin_form_stats.c        | 216 ++++++++++++++++++
 tools/testing/selftests/kvm/lib/kvm_util.c    |  12 +
 virt/kvm/kvm_main.c                           | 179 ++++++++++++++-
 24 files changed, 1188 insertions(+), 90 deletions(-)
 create mode 100644 tools/testing/selftests/kvm/kvm_bin_form_stats.c


base-commit: a4345a7cecfb91ae78cd43d26b0c6a956420761a
-- 
2.31.1.818.g46aad6cb9e-goog

[PATCH v6 0/4] KVM statistics data fd-based binary interface

[Jing Zhang]

This patchset provides a file descriptor for every VM and VCPU to read
KVM statistics data in binary format.
It is meant to provide a lightweight, flexible, scalable and efficient
lock-free solution for user space telemetry applications to pull the
statistics data periodically for large scale systems. The pulling
frequency could be as high as a few times per second.
In this patchset, every statistics data are treated to have some
attributes as below:
  * architecture dependent or common
  * VM statistics data or VCPU statistics data
  * type: cumulative, instantaneous,
  * unit: none for simple counter, nanosecond, microsecond,
    millisecond, second, Byte, KiByte, MiByte, GiByte. Clock Cycles
Since no lock/synchronization is used, the consistency between all
the statistics data is not guaranteed. That means not all statistics
data are read out at the exact same time, since the statistics date
are still being updated by KVM subsystems while they are read out.

---

* v5 -> v6
  - Use designated initializers for STATS_DESC
  - Change KVM_STATS_SCALE... to KVM_STATS_BASE...
  - Use a common function for kvm_[vm|vcpu]_stats_read
  - Fix some documentation errors/missings
  - Use TEST_ASSERT in selftest
  - Use a common function for [vm|vcpu]_stats_test in selftest

* v4 -> v5
  - Rebase to kvm/queue, commit a4345a7cecfb ("Merge tag
    'kvmarm-fixes-5.13-1'")
  - Change maximum stats name length to 48
  - Replace VM_STATS_COMMON/VCPU_STATS_COMMON macros with stats
    descriptor definition macros.
  - Fixed some errors/warnings reported by checkpatch.pl

* v3 -> v4
  - Rebase to kvm/queue, commit 9f242010c3b4 ("KVM: avoid "deadlock"
    between install_new_memslots and MMU notifier")
  - Use C-stype comments in the whole patch
  - Fix wrong count for x86 VCPU stats descriptors
  - Fix KVM stats data size counting and validity check in selftest

* v2 -> v3
  - Rebase to kvm/queue, commit edf408f5257b ("KVM: avoid "deadlock"
    between install_new_memslots and MMU notifier")
  - Resolve some nitpicks about format

* v1 -> v2
  - Use ARRAY_SIZE to count the number of stats descriptors
  - Fix missing `size` field initialization in macro STATS_DESC

[1] https://lore.kernel.org/kvm/20210402224359.2297157-1-jingzhangos@google.com
[2] https://lore.kernel.org/kvm/20210415151741.1607806-1-jingzhangos@google.com
[3] https://lore.kernel.org/kvm/20210423181727.596466-1-jingzhangos@google.com
[4] https://lore.kernel.org/kvm/20210429203740.1935629-1-jingzhangos@google.com
[5] https://lore.kernel.org/kvm/20210517145314.157626-1-jingzhangos@google.com

---

Jing Zhang (4):
  KVM: stats: Separate common stats from architecture specific ones
  KVM: stats: Add fd-based API to read binary stats data
  KVM: stats: Add documentation for statistics data binary interface
  KVM: selftests: Add selftest for KVM statistics data binary interface

 Documentation/virt/kvm/api.rst                | 179 +++++++++++++++
 arch/arm64/include/asm/kvm_host.h             |   9 +-
 arch/arm64/kvm/guest.c                        |  38 ++-
 arch/mips/include/asm/kvm_host.h              |   9 +-
 arch/mips/kvm/mips.c                          |  64 +++++-
 arch/powerpc/include/asm/kvm_host.h           |   9 +-
 arch/powerpc/kvm/book3s.c                     |  64 +++++-
 arch/powerpc/kvm/book3s_hv.c                  |  12 +-
 arch/powerpc/kvm/book3s_pr.c                  |   2 +-
 arch/powerpc/kvm/book3s_pr_papr.c             |   2 +-
 arch/powerpc/kvm/booke.c                      |  59 ++++-
 arch/s390/include/asm/kvm_host.h              |   9 +-
 arch/s390/kvm/kvm-s390.c                      | 129 ++++++++++-
 arch/x86/include/asm/kvm_host.h               |   9 +-
 arch/x86/kvm/x86.c                            |  67 +++++-
 include/linux/kvm_host.h                      | 141 +++++++++++-
 include/linux/kvm_types.h                     |  12 +
 include/uapi/linux/kvm.h                      |  50 ++++
 tools/testing/selftests/kvm/.gitignore        |   1 +
 tools/testing/selftests/kvm/Makefile          |   3 +
 .../testing/selftests/kvm/include/kvm_util.h  |   3 +
 .../selftests/kvm/kvm_bin_form_stats.c        | 216 ++++++++++++++++++
 tools/testing/selftests/kvm/lib/kvm_util.c    |  12 +
 virt/kvm/kvm_main.c                           | 179 ++++++++++++++-
 24 files changed, 1188 insertions(+), 90 deletions(-)
 create mode 100644 tools/testing/selftests/kvm/kvm_bin_form_stats.c


base-commit: a4345a7cecfb91ae78cd43d26b0c6a956420761a
-- 
2.31.1.818.g46aad6cb9e-goog

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

[PATCH v6 1/4] KVM: stats: Separate common stats from architecture specific ones

[Jing Zhang]

Put all common statistics in a separate structure to ease
statistics handling for the incoming new statistics API.

No functional change intended.

Reviewed-by: David Matlack <dmatlack@google.com>
Reviewed-by: Ricardo Koller <ricarkol@google.com>
Signed-off-by: Jing Zhang <jingzhangos@google.com>
---
 arch/arm64/include/asm/kvm_host.h   |  9 ++-------
 arch/arm64/kvm/guest.c              | 12 ++++++------
 arch/mips/include/asm/kvm_host.h    |  9 ++-------
 arch/mips/kvm/mips.c                | 12 ++++++------
 arch/powerpc/include/asm/kvm_host.h |  9 ++-------
 arch/powerpc/kvm/book3s.c           | 12 ++++++------
 arch/powerpc/kvm/book3s_hv.c        | 12 ++++++------
 arch/powerpc/kvm/book3s_pr.c        |  2 +-
 arch/powerpc/kvm/book3s_pr_papr.c   |  2 +-
 arch/powerpc/kvm/booke.c            | 14 +++++++-------
 arch/s390/include/asm/kvm_host.h    |  9 ++-------
 arch/s390/kvm/kvm-s390.c            | 12 ++++++------
 arch/x86/include/asm/kvm_host.h     |  9 ++-------
 arch/x86/kvm/x86.c                  | 14 +++++++-------
 include/linux/kvm_host.h            |  9 +++++++--
 include/linux/kvm_types.h           | 12 ++++++++++++
 virt/kvm/kvm_main.c                 | 14 +++++++-------
 17 files changed, 82 insertions(+), 90 deletions(-)

diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index 7cd7d5c8c4bc..f3ad7a20b0af 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -556,16 +556,11 @@ static inline bool __vcpu_write_sys_reg_to_cpu(u64 val, int reg)
 }
 
 struct kvm_vm_stat {
-	ulong remote_tlb_flush;
+	struct kvm_vm_stat_common common;
 };
 
 struct kvm_vcpu_stat {
-	u64 halt_successful_poll;
-	u64 halt_attempted_poll;
-	u64 halt_poll_success_ns;
-	u64 halt_poll_fail_ns;
-	u64 halt_poll_invalid;
-	u64 halt_wakeup;
+	struct kvm_vcpu_stat_common common;
 	u64 hvc_exit_stat;
 	u64 wfe_exit_stat;
 	u64 wfi_exit_stat;
diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
index 5cb4a1cd5603..0e41331b0911 100644
--- a/arch/arm64/kvm/guest.c
+++ b/arch/arm64/kvm/guest.c
@@ -29,18 +29,18 @@
 #include "trace.h"
 
 struct kvm_stats_debugfs_item debugfs_entries[] = {
-	VCPU_STAT("halt_successful_poll", halt_successful_poll),
-	VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
-	VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
-	VCPU_STAT("halt_wakeup", halt_wakeup),
+	VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
+	VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
+	VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
+	VCPU_STAT_COM("halt_wakeup", halt_wakeup),
 	VCPU_STAT("hvc_exit_stat", hvc_exit_stat),
 	VCPU_STAT("wfe_exit_stat", wfe_exit_stat),
 	VCPU_STAT("wfi_exit_stat", wfi_exit_stat),
 	VCPU_STAT("mmio_exit_user", mmio_exit_user),
 	VCPU_STAT("mmio_exit_kernel", mmio_exit_kernel),
 	VCPU_STAT("exits", exits),
-	VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
-	VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
+	VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
+	VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
 	{ NULL }
 };
 
diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h
index fca4547d580f..6f610fbcd8d1 100644
--- a/arch/mips/include/asm/kvm_host.h
+++ b/arch/mips/include/asm/kvm_host.h
@@ -109,10 +109,11 @@ static inline bool kvm_is_error_hva(unsigned long addr)
 }
 
 struct kvm_vm_stat {
-	ulong remote_tlb_flush;
+	struct kvm_vm_stat_common common;
 };
 
 struct kvm_vcpu_stat {
+	struct kvm_vcpu_stat_common common;
 	u64 wait_exits;
 	u64 cache_exits;
 	u64 signal_exits;
@@ -142,12 +143,6 @@ struct kvm_vcpu_stat {
 #ifdef CONFIG_CPU_LOONGSON64
 	u64 vz_cpucfg_exits;
 #endif
-	u64 halt_successful_poll;
-	u64 halt_attempted_poll;
-	u64 halt_poll_success_ns;
-	u64 halt_poll_fail_ns;
-	u64 halt_poll_invalid;
-	u64 halt_wakeup;
 };
 
 struct kvm_arch_memory_slot {
diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
index 4d4af97dcc88..f4fc60c05e9c 100644
--- a/arch/mips/kvm/mips.c
+++ b/arch/mips/kvm/mips.c
@@ -68,12 +68,12 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
 #ifdef CONFIG_CPU_LOONGSON64
 	VCPU_STAT("vz_cpucfg", vz_cpucfg_exits),
 #endif
-	VCPU_STAT("halt_successful_poll", halt_successful_poll),
-	VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
-	VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
-	VCPU_STAT("halt_wakeup", halt_wakeup),
-	VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
-	VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
+	VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
+	VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
+	VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
+	VCPU_STAT_COM("halt_wakeup", halt_wakeup),
+	VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
+	VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
 	{NULL}
 };
 
diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
index 1e83359f286b..473d9d0804ff 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -80,12 +80,13 @@ struct kvmppc_book3s_shadow_vcpu;
 struct kvm_nested_guest;
 
 struct kvm_vm_stat {
-	ulong remote_tlb_flush;
+	struct kvm_vm_stat_common common;
 	ulong num_2M_pages;
 	ulong num_1G_pages;
 };
 
 struct kvm_vcpu_stat {
+	struct kvm_vcpu_stat_common common;
 	u64 sum_exits;
 	u64 mmio_exits;
 	u64 signal_exits;
@@ -101,14 +102,8 @@ struct kvm_vcpu_stat {
 	u64 emulated_inst_exits;
 	u64 dec_exits;
 	u64 ext_intr_exits;
-	u64 halt_poll_success_ns;
-	u64 halt_poll_fail_ns;
 	u64 halt_wait_ns;
-	u64 halt_successful_poll;
-	u64 halt_attempted_poll;
 	u64 halt_successful_wait;
-	u64 halt_poll_invalid;
-	u64 halt_wakeup;
 	u64 dbell_exits;
 	u64 gdbell_exits;
 	u64 ld;
diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
index 2b691f4d1f26..bd3a10e1fdaf 100644
--- a/arch/powerpc/kvm/book3s.c
+++ b/arch/powerpc/kvm/book3s.c
@@ -47,14 +47,14 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
 	VCPU_STAT("dec", dec_exits),
 	VCPU_STAT("ext_intr", ext_intr_exits),
 	VCPU_STAT("queue_intr", queue_intr),
-	VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
-	VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
+	VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
+	VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
 	VCPU_STAT("halt_wait_ns", halt_wait_ns),
-	VCPU_STAT("halt_successful_poll", halt_successful_poll),
-	VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
+	VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
+	VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
 	VCPU_STAT("halt_successful_wait", halt_successful_wait),
-	VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
-	VCPU_STAT("halt_wakeup", halt_wakeup),
+	VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
+	VCPU_STAT_COM("halt_wakeup", halt_wakeup),
 	VCPU_STAT("pf_storage", pf_storage),
 	VCPU_STAT("sp_storage", sp_storage),
 	VCPU_STAT("pf_instruc", pf_instruc),
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 28a80d240b76..58e187e03c52 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -236,7 +236,7 @@ static void kvmppc_fast_vcpu_kick_hv(struct kvm_vcpu *vcpu)
 
 	waitp = kvm_arch_vcpu_get_wait(vcpu);
 	if (rcuwait_wake_up(waitp))
-		++vcpu->stat.halt_wakeup;
+		++vcpu->stat.common.halt_wakeup;
 
 	cpu = READ_ONCE(vcpu->arch.thread_cpu);
 	if (cpu >= 0 && kvmppc_ipi_thread(cpu))
@@ -3925,7 +3925,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
 	cur = start_poll = ktime_get();
 	if (vc->halt_poll_ns) {
 		ktime_t stop = ktime_add_ns(start_poll, vc->halt_poll_ns);
-		++vc->runner->stat.halt_attempted_poll;
+		++vc->runner->stat.common.halt_attempted_poll;
 
 		vc->vcore_state = VCORE_POLLING;
 		spin_unlock(&vc->lock);
@@ -3942,7 +3942,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
 		vc->vcore_state = VCORE_INACTIVE;
 
 		if (!do_sleep) {
-			++vc->runner->stat.halt_successful_poll;
+			++vc->runner->stat.common.halt_successful_poll;
 			goto out;
 		}
 	}
@@ -3954,7 +3954,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
 		do_sleep = 0;
 		/* If we polled, count this as a successful poll */
 		if (vc->halt_poll_ns)
-			++vc->runner->stat.halt_successful_poll;
+			++vc->runner->stat.common.halt_successful_poll;
 		goto out;
 	}
 
@@ -3981,13 +3981,13 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
 			ktime_to_ns(cur) - ktime_to_ns(start_wait);
 		/* Attribute failed poll time */
 		if (vc->halt_poll_ns)
-			vc->runner->stat.halt_poll_fail_ns +=
+			vc->runner->stat.common.halt_poll_fail_ns +=
 				ktime_to_ns(start_wait) -
 				ktime_to_ns(start_poll);
 	} else {
 		/* Attribute successful poll time */
 		if (vc->halt_poll_ns)
-			vc->runner->stat.halt_poll_success_ns +=
+			vc->runner->stat.common.halt_poll_success_ns +=
 				ktime_to_ns(cur) -
 				ktime_to_ns(start_poll);
 	}
diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c
index d7733b07f489..214caa9d9675 100644
--- a/arch/powerpc/kvm/book3s_pr.c
+++ b/arch/powerpc/kvm/book3s_pr.c
@@ -493,7 +493,7 @@ static void kvmppc_set_msr_pr(struct kvm_vcpu *vcpu, u64 msr)
 		if (!vcpu->arch.pending_exceptions) {
 			kvm_vcpu_block(vcpu);
 			kvm_clear_request(KVM_REQ_UNHALT, vcpu);
-			vcpu->stat.halt_wakeup++;
+			vcpu->stat.common.halt_wakeup++;
 
 			/* Unset POW bit after we woke up */
 			msr &= ~MSR_POW;
diff --git a/arch/powerpc/kvm/book3s_pr_papr.c b/arch/powerpc/kvm/book3s_pr_papr.c
index 031c8015864a..9384625c8051 100644
--- a/arch/powerpc/kvm/book3s_pr_papr.c
+++ b/arch/powerpc/kvm/book3s_pr_papr.c
@@ -378,7 +378,7 @@ int kvmppc_h_pr(struct kvm_vcpu *vcpu, unsigned long cmd)
 		kvmppc_set_msr_fast(vcpu, kvmppc_get_msr(vcpu) | MSR_EE);
 		kvm_vcpu_block(vcpu);
 		kvm_clear_request(KVM_REQ_UNHALT, vcpu);
-		vcpu->stat.halt_wakeup++;
+		vcpu->stat.common.halt_wakeup++;
 		return EMULATE_DONE;
 	case H_LOGICAL_CI_LOAD:
 		return kvmppc_h_pr_logical_ci_load(vcpu);
diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
index 7d5fe43f85c4..07fdd7a1254a 100644
--- a/arch/powerpc/kvm/booke.c
+++ b/arch/powerpc/kvm/booke.c
@@ -49,15 +49,15 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
 	VCPU_STAT("inst_emu", emulated_inst_exits),
 	VCPU_STAT("dec", dec_exits),
 	VCPU_STAT("ext_intr", ext_intr_exits),
-	VCPU_STAT("halt_successful_poll", halt_successful_poll),
-	VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
-	VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
-	VCPU_STAT("halt_wakeup", halt_wakeup),
+	VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
+	VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
+	VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
+	VCPU_STAT_COM("halt_wakeup", halt_wakeup),
 	VCPU_STAT("doorbell", dbell_exits),
 	VCPU_STAT("guest doorbell", gdbell_exits),
-	VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
-	VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
-	VM_STAT("remote_tlb_flush", remote_tlb_flush),
+	VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
+	VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
+	VM_STAT_COM("remote_tlb_flush", remote_tlb_flush),
 	{ NULL }
 };
 
diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
index 8925f3969478..57a20897f3db 100644
--- a/arch/s390/include/asm/kvm_host.h
+++ b/arch/s390/include/asm/kvm_host.h
@@ -361,6 +361,7 @@ struct sie_page {
 };
 
 struct kvm_vcpu_stat {
+	struct kvm_vcpu_stat_common common;
 	u64 exit_userspace;
 	u64 exit_null;
 	u64 exit_external_request;
@@ -370,13 +371,7 @@ struct kvm_vcpu_stat {
 	u64 exit_validity;
 	u64 exit_instruction;
 	u64 exit_pei;
-	u64 halt_successful_poll;
-	u64 halt_attempted_poll;
-	u64 halt_poll_invalid;
 	u64 halt_no_poll_steal;
-	u64 halt_wakeup;
-	u64 halt_poll_success_ns;
-	u64 halt_poll_fail_ns;
 	u64 instruction_lctl;
 	u64 instruction_lctlg;
 	u64 instruction_stctl;
@@ -755,12 +750,12 @@ struct kvm_vcpu_arch {
 };
 
 struct kvm_vm_stat {
+	struct kvm_vm_stat_common common;
 	u64 inject_io;
 	u64 inject_float_mchk;
 	u64 inject_pfault_done;
 	u64 inject_service_signal;
 	u64 inject_virtio;
-	u64 remote_tlb_flush;
 };
 
 struct kvm_arch_memory_slot {
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 1296fc10f80c..d6bf3372bb10 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -72,13 +72,13 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
 	VCPU_STAT("exit_program_interruption", exit_program_interruption),
 	VCPU_STAT("exit_instr_and_program_int", exit_instr_and_program),
 	VCPU_STAT("exit_operation_exception", exit_operation_exception),
-	VCPU_STAT("halt_successful_poll", halt_successful_poll),
-	VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
-	VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
+	VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
+	VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
+	VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
 	VCPU_STAT("halt_no_poll_steal", halt_no_poll_steal),
-	VCPU_STAT("halt_wakeup", halt_wakeup),
-	VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
-	VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
+	VCPU_STAT_COM("halt_wakeup", halt_wakeup),
+	VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
+	VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
 	VCPU_STAT("instruction_lctlg", instruction_lctlg),
 	VCPU_STAT("instruction_lctl", instruction_lctl),
 	VCPU_STAT("instruction_stctl", instruction_stctl),
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 55efbacfc244..5bfd6893fbf6 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1127,6 +1127,7 @@ struct kvm_arch {
 };
 
 struct kvm_vm_stat {
+	struct kvm_vm_stat_common common;
 	ulong mmu_shadow_zapped;
 	ulong mmu_pte_write;
 	ulong mmu_pde_zapped;
@@ -1134,13 +1135,13 @@ struct kvm_vm_stat {
 	ulong mmu_recycled;
 	ulong mmu_cache_miss;
 	ulong mmu_unsync;
-	ulong remote_tlb_flush;
 	ulong lpages;
 	ulong nx_lpage_splits;
 	ulong max_mmu_page_hash_collisions;
 };
 
 struct kvm_vcpu_stat {
+	struct kvm_vcpu_stat_common common;
 	u64 pf_fixed;
 	u64 pf_guest;
 	u64 tlb_flush;
@@ -1154,10 +1155,6 @@ struct kvm_vcpu_stat {
 	u64 nmi_window_exits;
 	u64 l1d_flush;
 	u64 halt_exits;
-	u64 halt_successful_poll;
-	u64 halt_attempted_poll;
-	u64 halt_poll_invalid;
-	u64 halt_wakeup;
 	u64 request_irq_exits;
 	u64 irq_exits;
 	u64 host_state_reload;
@@ -1168,8 +1165,6 @@ struct kvm_vcpu_stat {
 	u64 irq_injections;
 	u64 nmi_injections;
 	u64 req_event;
-	u64 halt_poll_success_ns;
-	u64 halt_poll_fail_ns;
 	u64 nested_run;
 	u64 directed_yield_attempted;
 	u64 directed_yield_successful;
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 9b6bca616929..9a93d80caff6 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -226,10 +226,10 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
 	VCPU_STAT("irq_window", irq_window_exits),
 	VCPU_STAT("nmi_window", nmi_window_exits),
 	VCPU_STAT("halt_exits", halt_exits),
-	VCPU_STAT("halt_successful_poll", halt_successful_poll),
-	VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
-	VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
-	VCPU_STAT("halt_wakeup", halt_wakeup),
+	VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
+	VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
+	VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
+	VCPU_STAT_COM("halt_wakeup", halt_wakeup),
 	VCPU_STAT("hypercalls", hypercalls),
 	VCPU_STAT("request_irq", request_irq_exits),
 	VCPU_STAT("irq_exits", irq_exits),
@@ -241,8 +241,8 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
 	VCPU_STAT("nmi_injections", nmi_injections),
 	VCPU_STAT("req_event", req_event),
 	VCPU_STAT("l1d_flush", l1d_flush),
-	VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
-	VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
+	VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
+	VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
 	VCPU_STAT("nested_run", nested_run),
 	VCPU_STAT("directed_yield_attempted", directed_yield_attempted),
 	VCPU_STAT("directed_yield_successful", directed_yield_successful),
@@ -253,7 +253,7 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
 	VM_STAT("mmu_recycled", mmu_recycled),
 	VM_STAT("mmu_cache_miss", mmu_cache_miss),
 	VM_STAT("mmu_unsync", mmu_unsync),
-	VM_STAT("remote_tlb_flush", remote_tlb_flush),
+	VM_STAT_COM("remote_tlb_flush", remote_tlb_flush),
 	VM_STAT("largepages", lpages, .mode = 0444),
 	VM_STAT("nx_largepages_splitted", nx_lpage_splits, .mode = 0444),
 	VM_STAT("max_mmu_page_hash_collisions", max_mmu_page_hash_collisions),
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 2f34487e21f2..97700e41db3b 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -1243,10 +1243,15 @@ struct kvm_stats_debugfs_item {
 #define KVM_DBGFS_GET_MODE(dbgfs_item)                                         \
 	((dbgfs_item)->mode ? (dbgfs_item)->mode : 0644)
 
-#define VM_STAT(n, x, ...) 							\
+#define VM_STAT(n, x, ...)						       \
 	{ n, offsetof(struct kvm, stat.x), KVM_STAT_VM, ## __VA_ARGS__ }
-#define VCPU_STAT(n, x, ...)							\
+#define VCPU_STAT(n, x, ...)						       \
 	{ n, offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU, ## __VA_ARGS__ }
+#define VM_STAT_COM(n, x, ...)						       \
+	{ n, offsetof(struct kvm, stat.common.x), KVM_STAT_VM, ## __VA_ARGS__ }
+#define VCPU_STAT_COM(n, x, ...)					       \
+	{ n, offsetof(struct kvm_vcpu, stat.common.x),			       \
+	  KVM_STAT_VCPU, ## __VA_ARGS__ }
 
 extern struct kvm_stats_debugfs_item debugfs_entries[];
 extern struct dentry *kvm_debugfs_dir;
diff --git a/include/linux/kvm_types.h b/include/linux/kvm_types.h
index a7580f69dda0..87eb05ad678b 100644
--- a/include/linux/kvm_types.h
+++ b/include/linux/kvm_types.h
@@ -76,5 +76,17 @@ struct kvm_mmu_memory_cache {
 };
 #endif
 
+struct kvm_vm_stat_common {
+	ulong remote_tlb_flush;
+};
+
+struct kvm_vcpu_stat_common {
+	u64 halt_successful_poll;
+	u64 halt_attempted_poll;
+	u64 halt_poll_invalid;
+	u64 halt_wakeup;
+	u64 halt_poll_success_ns;
+	u64 halt_poll_fail_ns;
+};
 
 #endif /* __KVM_TYPES_H__ */
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 6b4feb92dc79..34a4cf265297 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -330,7 +330,7 @@ void kvm_flush_remote_tlbs(struct kvm *kvm)
 	 */
 	if (!kvm_arch_flush_remote_tlb(kvm)
 	    || kvm_make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
-		++kvm->stat.remote_tlb_flush;
+		++kvm->stat.common.remote_tlb_flush;
 	cmpxchg(&kvm->tlbs_dirty, dirty_count, 0);
 }
 EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs);
@@ -2940,9 +2940,9 @@ static inline void
 update_halt_poll_stats(struct kvm_vcpu *vcpu, u64 poll_ns, bool waited)
 {
 	if (waited)
-		vcpu->stat.halt_poll_fail_ns += poll_ns;
+		vcpu->stat.common.halt_poll_fail_ns += poll_ns;
 	else
-		vcpu->stat.halt_poll_success_ns += poll_ns;
+		vcpu->stat.common.halt_poll_success_ns += poll_ns;
 }
 
 /*
@@ -2960,16 +2960,16 @@ void kvm_vcpu_block(struct kvm_vcpu *vcpu)
 	if (vcpu->halt_poll_ns && !kvm_arch_no_poll(vcpu)) {
 		ktime_t stop = ktime_add_ns(ktime_get(), vcpu->halt_poll_ns);
 
-		++vcpu->stat.halt_attempted_poll;
+		++vcpu->stat.common.halt_attempted_poll;
 		do {
 			/*
 			 * This sets KVM_REQ_UNHALT if an interrupt
 			 * arrives.
 			 */
 			if (kvm_vcpu_check_block(vcpu) < 0) {
-				++vcpu->stat.halt_successful_poll;
+				++vcpu->stat.common.halt_successful_poll;
 				if (!vcpu_valid_wakeup(vcpu))
-					++vcpu->stat.halt_poll_invalid;
+					++vcpu->stat.common.halt_poll_invalid;
 				goto out;
 			}
 			poll_end = cur = ktime_get();
@@ -3027,7 +3027,7 @@ bool kvm_vcpu_wake_up(struct kvm_vcpu *vcpu)
 	waitp = kvm_arch_vcpu_get_wait(vcpu);
 	if (rcuwait_wake_up(waitp)) {
 		WRITE_ONCE(vcpu->ready, true);
-		++vcpu->stat.halt_wakeup;
+		++vcpu->stat.common.halt_wakeup;
 		return true;
 	}
 
-- 
2.31.1.818.g46aad6cb9e-goog

[PATCH v6 1/4] KVM: stats: Separate common stats from architecture specific ones

[Jing Zhang]

Put all common statistics in a separate structure to ease
statistics handling for the incoming new statistics API.

No functional change intended.

Reviewed-by: David Matlack <dmatlack@google.com>
Reviewed-by: Ricardo Koller <ricarkol@google.com>
Signed-off-by: Jing Zhang <jingzhangos@google.com>
---
 arch/arm64/include/asm/kvm_host.h   |  9 ++-------
 arch/arm64/kvm/guest.c              | 12 ++++++------
 arch/mips/include/asm/kvm_host.h    |  9 ++-------
 arch/mips/kvm/mips.c                | 12 ++++++------
 arch/powerpc/include/asm/kvm_host.h |  9 ++-------
 arch/powerpc/kvm/book3s.c           | 12 ++++++------
 arch/powerpc/kvm/book3s_hv.c        | 12 ++++++------
 arch/powerpc/kvm/book3s_pr.c        |  2 +-
 arch/powerpc/kvm/book3s_pr_papr.c   |  2 +-
 arch/powerpc/kvm/booke.c            | 14 +++++++-------
 arch/s390/include/asm/kvm_host.h    |  9 ++-------
 arch/s390/kvm/kvm-s390.c            | 12 ++++++------
 arch/x86/include/asm/kvm_host.h     |  9 ++-------
 arch/x86/kvm/x86.c                  | 14 +++++++-------
 include/linux/kvm_host.h            |  9 +++++++--
 include/linux/kvm_types.h           | 12 ++++++++++++
 virt/kvm/kvm_main.c                 | 14 +++++++-------
 17 files changed, 82 insertions(+), 90 deletions(-)

diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index 7cd7d5c8c4bc..f3ad7a20b0af 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -556,16 +556,11 @@ static inline bool __vcpu_write_sys_reg_to_cpu(u64 val, int reg)
 }
 
 struct kvm_vm_stat {
-	ulong remote_tlb_flush;
+	struct kvm_vm_stat_common common;
 };
 
 struct kvm_vcpu_stat {
-	u64 halt_successful_poll;
-	u64 halt_attempted_poll;
-	u64 halt_poll_success_ns;
-	u64 halt_poll_fail_ns;
-	u64 halt_poll_invalid;
-	u64 halt_wakeup;
+	struct kvm_vcpu_stat_common common;
 	u64 hvc_exit_stat;
 	u64 wfe_exit_stat;
 	u64 wfi_exit_stat;
diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
index 5cb4a1cd5603..0e41331b0911 100644
--- a/arch/arm64/kvm/guest.c
+++ b/arch/arm64/kvm/guest.c
@@ -29,18 +29,18 @@
 #include "trace.h"
 
 struct kvm_stats_debugfs_item debugfs_entries[] = {
-	VCPU_STAT("halt_successful_poll", halt_successful_poll),
-	VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
-	VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
-	VCPU_STAT("halt_wakeup", halt_wakeup),
+	VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
+	VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
+	VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
+	VCPU_STAT_COM("halt_wakeup", halt_wakeup),
 	VCPU_STAT("hvc_exit_stat", hvc_exit_stat),
 	VCPU_STAT("wfe_exit_stat", wfe_exit_stat),
 	VCPU_STAT("wfi_exit_stat", wfi_exit_stat),
 	VCPU_STAT("mmio_exit_user", mmio_exit_user),
 	VCPU_STAT("mmio_exit_kernel", mmio_exit_kernel),
 	VCPU_STAT("exits", exits),
-	VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
-	VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
+	VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
+	VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
 	{ NULL }
 };
 
diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h
index fca4547d580f..6f610fbcd8d1 100644
--- a/arch/mips/include/asm/kvm_host.h
+++ b/arch/mips/include/asm/kvm_host.h
@@ -109,10 +109,11 @@ static inline bool kvm_is_error_hva(unsigned long addr)
 }
 
 struct kvm_vm_stat {
-	ulong remote_tlb_flush;
+	struct kvm_vm_stat_common common;
 };
 
 struct kvm_vcpu_stat {
+	struct kvm_vcpu_stat_common common;
 	u64 wait_exits;
 	u64 cache_exits;
 	u64 signal_exits;
@@ -142,12 +143,6 @@ struct kvm_vcpu_stat {
 #ifdef CONFIG_CPU_LOONGSON64
 	u64 vz_cpucfg_exits;
 #endif
-	u64 halt_successful_poll;
-	u64 halt_attempted_poll;
-	u64 halt_poll_success_ns;
-	u64 halt_poll_fail_ns;
-	u64 halt_poll_invalid;
-	u64 halt_wakeup;
 };
 
 struct kvm_arch_memory_slot {
diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
index 4d4af97dcc88..f4fc60c05e9c 100644
--- a/arch/mips/kvm/mips.c
+++ b/arch/mips/kvm/mips.c
@@ -68,12 +68,12 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
 #ifdef CONFIG_CPU_LOONGSON64
 	VCPU_STAT("vz_cpucfg", vz_cpucfg_exits),
 #endif
-	VCPU_STAT("halt_successful_poll", halt_successful_poll),
-	VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
-	VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
-	VCPU_STAT("halt_wakeup", halt_wakeup),
-	VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
-	VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
+	VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
+	VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
+	VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
+	VCPU_STAT_COM("halt_wakeup", halt_wakeup),
+	VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
+	VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
 	{NULL}
 };
 
diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
index 1e83359f286b..473d9d0804ff 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -80,12 +80,13 @@ struct kvmppc_book3s_shadow_vcpu;
 struct kvm_nested_guest;
 
 struct kvm_vm_stat {
-	ulong remote_tlb_flush;
+	struct kvm_vm_stat_common common;
 	ulong num_2M_pages;
 	ulong num_1G_pages;
 };
 
 struct kvm_vcpu_stat {
+	struct kvm_vcpu_stat_common common;
 	u64 sum_exits;
 	u64 mmio_exits;
 	u64 signal_exits;
@@ -101,14 +102,8 @@ struct kvm_vcpu_stat {
 	u64 emulated_inst_exits;
 	u64 dec_exits;
 	u64 ext_intr_exits;
-	u64 halt_poll_success_ns;
-	u64 halt_poll_fail_ns;
 	u64 halt_wait_ns;
-	u64 halt_successful_poll;
-	u64 halt_attempted_poll;
 	u64 halt_successful_wait;
-	u64 halt_poll_invalid;
-	u64 halt_wakeup;
 	u64 dbell_exits;
 	u64 gdbell_exits;
 	u64 ld;
diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
index 2b691f4d1f26..bd3a10e1fdaf 100644
--- a/arch/powerpc/kvm/book3s.c
+++ b/arch/powerpc/kvm/book3s.c
@@ -47,14 +47,14 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
 	VCPU_STAT("dec", dec_exits),
 	VCPU_STAT("ext_intr", ext_intr_exits),
 	VCPU_STAT("queue_intr", queue_intr),
-	VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
-	VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
+	VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
+	VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
 	VCPU_STAT("halt_wait_ns", halt_wait_ns),
-	VCPU_STAT("halt_successful_poll", halt_successful_poll),
-	VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
+	VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
+	VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
 	VCPU_STAT("halt_successful_wait", halt_successful_wait),
-	VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
-	VCPU_STAT("halt_wakeup", halt_wakeup),
+	VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
+	VCPU_STAT_COM("halt_wakeup", halt_wakeup),
 	VCPU_STAT("pf_storage", pf_storage),
 	VCPU_STAT("sp_storage", sp_storage),
 	VCPU_STAT("pf_instruc", pf_instruc),
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 28a80d240b76..58e187e03c52 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -236,7 +236,7 @@ static void kvmppc_fast_vcpu_kick_hv(struct kvm_vcpu *vcpu)
 
 	waitp = kvm_arch_vcpu_get_wait(vcpu);
 	if (rcuwait_wake_up(waitp))
-		++vcpu->stat.halt_wakeup;
+		++vcpu->stat.common.halt_wakeup;
 
 	cpu = READ_ONCE(vcpu->arch.thread_cpu);
 	if (cpu >= 0 && kvmppc_ipi_thread(cpu))
@@ -3925,7 +3925,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
 	cur = start_poll = ktime_get();
 	if (vc->halt_poll_ns) {
 		ktime_t stop = ktime_add_ns(start_poll, vc->halt_poll_ns);
-		++vc->runner->stat.halt_attempted_poll;
+		++vc->runner->stat.common.halt_attempted_poll;
 
 		vc->vcore_state = VCORE_POLLING;
 		spin_unlock(&vc->lock);
@@ -3942,7 +3942,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
 		vc->vcore_state = VCORE_INACTIVE;
 
 		if (!do_sleep) {
-			++vc->runner->stat.halt_successful_poll;
+			++vc->runner->stat.common.halt_successful_poll;
 			goto out;
 		}
 	}
@@ -3954,7 +3954,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
 		do_sleep = 0;
 		/* If we polled, count this as a successful poll */
 		if (vc->halt_poll_ns)
-			++vc->runner->stat.halt_successful_poll;
+			++vc->runner->stat.common.halt_successful_poll;
 		goto out;
 	}
 
@@ -3981,13 +3981,13 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
 			ktime_to_ns(cur) - ktime_to_ns(start_wait);
 		/* Attribute failed poll time */
 		if (vc->halt_poll_ns)
-			vc->runner->stat.halt_poll_fail_ns ++			vc->runner->stat.common.halt_poll_fail_ns + 				ktime_to_ns(start_wait) -
 				ktime_to_ns(start_poll);
 	} else {
 		/* Attribute successful poll time */
 		if (vc->halt_poll_ns)
-			vc->runner->stat.halt_poll_success_ns ++			vc->runner->stat.common.halt_poll_success_ns + 				ktime_to_ns(cur) -
 				ktime_to_ns(start_poll);
 	}
diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c
index d7733b07f489..214caa9d9675 100644
--- a/arch/powerpc/kvm/book3s_pr.c
+++ b/arch/powerpc/kvm/book3s_pr.c
@@ -493,7 +493,7 @@ static void kvmppc_set_msr_pr(struct kvm_vcpu *vcpu, u64 msr)
 		if (!vcpu->arch.pending_exceptions) {
 			kvm_vcpu_block(vcpu);
 			kvm_clear_request(KVM_REQ_UNHALT, vcpu);
-			vcpu->stat.halt_wakeup++;
+			vcpu->stat.common.halt_wakeup++;
 
 			/* Unset POW bit after we woke up */
 			msr &= ~MSR_POW;
diff --git a/arch/powerpc/kvm/book3s_pr_papr.c b/arch/powerpc/kvm/book3s_pr_papr.c
index 031c8015864a..9384625c8051 100644
--- a/arch/powerpc/kvm/book3s_pr_papr.c
+++ b/arch/powerpc/kvm/book3s_pr_papr.c
@@ -378,7 +378,7 @@ int kvmppc_h_pr(struct kvm_vcpu *vcpu, unsigned long cmd)
 		kvmppc_set_msr_fast(vcpu, kvmppc_get_msr(vcpu) | MSR_EE);
 		kvm_vcpu_block(vcpu);
 		kvm_clear_request(KVM_REQ_UNHALT, vcpu);
-		vcpu->stat.halt_wakeup++;
+		vcpu->stat.common.halt_wakeup++;
 		return EMULATE_DONE;
 	case H_LOGICAL_CI_LOAD:
 		return kvmppc_h_pr_logical_ci_load(vcpu);
diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
index 7d5fe43f85c4..07fdd7a1254a 100644
--- a/arch/powerpc/kvm/booke.c
+++ b/arch/powerpc/kvm/booke.c
@@ -49,15 +49,15 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
 	VCPU_STAT("inst_emu", emulated_inst_exits),
 	VCPU_STAT("dec", dec_exits),
 	VCPU_STAT("ext_intr", ext_intr_exits),
-	VCPU_STAT("halt_successful_poll", halt_successful_poll),
-	VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
-	VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
-	VCPU_STAT("halt_wakeup", halt_wakeup),
+	VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
+	VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
+	VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
+	VCPU_STAT_COM("halt_wakeup", halt_wakeup),
 	VCPU_STAT("doorbell", dbell_exits),
 	VCPU_STAT("guest doorbell", gdbell_exits),
-	VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
-	VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
-	VM_STAT("remote_tlb_flush", remote_tlb_flush),
+	VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
+	VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
+	VM_STAT_COM("remote_tlb_flush", remote_tlb_flush),
 	{ NULL }
 };
 
diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
index 8925f3969478..57a20897f3db 100644
--- a/arch/s390/include/asm/kvm_host.h
+++ b/arch/s390/include/asm/kvm_host.h
@@ -361,6 +361,7 @@ struct sie_page {
 };
 
 struct kvm_vcpu_stat {
+	struct kvm_vcpu_stat_common common;
 	u64 exit_userspace;
 	u64 exit_null;
 	u64 exit_external_request;
@@ -370,13 +371,7 @@ struct kvm_vcpu_stat {
 	u64 exit_validity;
 	u64 exit_instruction;
 	u64 exit_pei;
-	u64 halt_successful_poll;
-	u64 halt_attempted_poll;
-	u64 halt_poll_invalid;
 	u64 halt_no_poll_steal;
-	u64 halt_wakeup;
-	u64 halt_poll_success_ns;
-	u64 halt_poll_fail_ns;
 	u64 instruction_lctl;
 	u64 instruction_lctlg;
 	u64 instruction_stctl;
@@ -755,12 +750,12 @@ struct kvm_vcpu_arch {
 };
 
 struct kvm_vm_stat {
+	struct kvm_vm_stat_common common;
 	u64 inject_io;
 	u64 inject_float_mchk;
 	u64 inject_pfault_done;
 	u64 inject_service_signal;
 	u64 inject_virtio;
-	u64 remote_tlb_flush;
 };
 
 struct kvm_arch_memory_slot {
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 1296fc10f80c..d6bf3372bb10 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -72,13 +72,13 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
 	VCPU_STAT("exit_program_interruption", exit_program_interruption),
 	VCPU_STAT("exit_instr_and_program_int", exit_instr_and_program),
 	VCPU_STAT("exit_operation_exception", exit_operation_exception),
-	VCPU_STAT("halt_successful_poll", halt_successful_poll),
-	VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
-	VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
+	VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
+	VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
+	VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
 	VCPU_STAT("halt_no_poll_steal", halt_no_poll_steal),
-	VCPU_STAT("halt_wakeup", halt_wakeup),
-	VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
-	VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
+	VCPU_STAT_COM("halt_wakeup", halt_wakeup),
+	VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
+	VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
 	VCPU_STAT("instruction_lctlg", instruction_lctlg),
 	VCPU_STAT("instruction_lctl", instruction_lctl),
 	VCPU_STAT("instruction_stctl", instruction_stctl),
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 55efbacfc244..5bfd6893fbf6 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1127,6 +1127,7 @@ struct kvm_arch {
 };
 
 struct kvm_vm_stat {
+	struct kvm_vm_stat_common common;
 	ulong mmu_shadow_zapped;
 	ulong mmu_pte_write;
 	ulong mmu_pde_zapped;
@@ -1134,13 +1135,13 @@ struct kvm_vm_stat {
 	ulong mmu_recycled;
 	ulong mmu_cache_miss;
 	ulong mmu_unsync;
-	ulong remote_tlb_flush;
 	ulong lpages;
 	ulong nx_lpage_splits;
 	ulong max_mmu_page_hash_collisions;
 };
 
 struct kvm_vcpu_stat {
+	struct kvm_vcpu_stat_common common;
 	u64 pf_fixed;
 	u64 pf_guest;
 	u64 tlb_flush;
@@ -1154,10 +1155,6 @@ struct kvm_vcpu_stat {
 	u64 nmi_window_exits;
 	u64 l1d_flush;
 	u64 halt_exits;
-	u64 halt_successful_poll;
-	u64 halt_attempted_poll;
-	u64 halt_poll_invalid;
-	u64 halt_wakeup;
 	u64 request_irq_exits;
 	u64 irq_exits;
 	u64 host_state_reload;
@@ -1168,8 +1165,6 @@ struct kvm_vcpu_stat {
 	u64 irq_injections;
 	u64 nmi_injections;
 	u64 req_event;
-	u64 halt_poll_success_ns;
-	u64 halt_poll_fail_ns;
 	u64 nested_run;
 	u64 directed_yield_attempted;
 	u64 directed_yield_successful;
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 9b6bca616929..9a93d80caff6 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -226,10 +226,10 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
 	VCPU_STAT("irq_window", irq_window_exits),
 	VCPU_STAT("nmi_window", nmi_window_exits),
 	VCPU_STAT("halt_exits", halt_exits),
-	VCPU_STAT("halt_successful_poll", halt_successful_poll),
-	VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
-	VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
-	VCPU_STAT("halt_wakeup", halt_wakeup),
+	VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
+	VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
+	VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
+	VCPU_STAT_COM("halt_wakeup", halt_wakeup),
 	VCPU_STAT("hypercalls", hypercalls),
 	VCPU_STAT("request_irq", request_irq_exits),
 	VCPU_STAT("irq_exits", irq_exits),
@@ -241,8 +241,8 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
 	VCPU_STAT("nmi_injections", nmi_injections),
 	VCPU_STAT("req_event", req_event),
 	VCPU_STAT("l1d_flush", l1d_flush),
-	VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
-	VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
+	VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
+	VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
 	VCPU_STAT("nested_run", nested_run),
 	VCPU_STAT("directed_yield_attempted", directed_yield_attempted),
 	VCPU_STAT("directed_yield_successful", directed_yield_successful),
@@ -253,7 +253,7 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
 	VM_STAT("mmu_recycled", mmu_recycled),
 	VM_STAT("mmu_cache_miss", mmu_cache_miss),
 	VM_STAT("mmu_unsync", mmu_unsync),
-	VM_STAT("remote_tlb_flush", remote_tlb_flush),
+	VM_STAT_COM("remote_tlb_flush", remote_tlb_flush),
 	VM_STAT("largepages", lpages, .mode = 0444),
 	VM_STAT("nx_largepages_splitted", nx_lpage_splits, .mode = 0444),
 	VM_STAT("max_mmu_page_hash_collisions", max_mmu_page_hash_collisions),
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 2f34487e21f2..97700e41db3b 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -1243,10 +1243,15 @@ struct kvm_stats_debugfs_item {
 #define KVM_DBGFS_GET_MODE(dbgfs_item)                                         \
 	((dbgfs_item)->mode ? (dbgfs_item)->mode : 0644)
 
-#define VM_STAT(n, x, ...) 							\
+#define VM_STAT(n, x, ...)						       \
 	{ n, offsetof(struct kvm, stat.x), KVM_STAT_VM, ## __VA_ARGS__ }
-#define VCPU_STAT(n, x, ...)							\
+#define VCPU_STAT(n, x, ...)						       \
 	{ n, offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU, ## __VA_ARGS__ }
+#define VM_STAT_COM(n, x, ...)						       \
+	{ n, offsetof(struct kvm, stat.common.x), KVM_STAT_VM, ## __VA_ARGS__ }
+#define VCPU_STAT_COM(n, x, ...)					       \
+	{ n, offsetof(struct kvm_vcpu, stat.common.x),			       \
+	  KVM_STAT_VCPU, ## __VA_ARGS__ }
 
 extern struct kvm_stats_debugfs_item debugfs_entries[];
 extern struct dentry *kvm_debugfs_dir;
diff --git a/include/linux/kvm_types.h b/include/linux/kvm_types.h
index a7580f69dda0..87eb05ad678b 100644
--- a/include/linux/kvm_types.h
+++ b/include/linux/kvm_types.h
@@ -76,5 +76,17 @@ struct kvm_mmu_memory_cache {
 };
 #endif
 
+struct kvm_vm_stat_common {
+	ulong remote_tlb_flush;
+};
+
+struct kvm_vcpu_stat_common {
+	u64 halt_successful_poll;
+	u64 halt_attempted_poll;
+	u64 halt_poll_invalid;
+	u64 halt_wakeup;
+	u64 halt_poll_success_ns;
+	u64 halt_poll_fail_ns;
+};
 
 #endif /* __KVM_TYPES_H__ */
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 6b4feb92dc79..34a4cf265297 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -330,7 +330,7 @@ void kvm_flush_remote_tlbs(struct kvm *kvm)
 	 */
 	if (!kvm_arch_flush_remote_tlb(kvm)
 	    || kvm_make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
-		++kvm->stat.remote_tlb_flush;
+		++kvm->stat.common.remote_tlb_flush;
 	cmpxchg(&kvm->tlbs_dirty, dirty_count, 0);
 }
 EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs);
@@ -2940,9 +2940,9 @@ static inline void
 update_halt_poll_stats(struct kvm_vcpu *vcpu, u64 poll_ns, bool waited)
 {
 	if (waited)
-		vcpu->stat.halt_poll_fail_ns += poll_ns;
+		vcpu->stat.common.halt_poll_fail_ns += poll_ns;
 	else
-		vcpu->stat.halt_poll_success_ns += poll_ns;
+		vcpu->stat.common.halt_poll_success_ns += poll_ns;
 }
 
 /*
@@ -2960,16 +2960,16 @@ void kvm_vcpu_block(struct kvm_vcpu *vcpu)
 	if (vcpu->halt_poll_ns && !kvm_arch_no_poll(vcpu)) {
 		ktime_t stop = ktime_add_ns(ktime_get(), vcpu->halt_poll_ns);
 
-		++vcpu->stat.halt_attempted_poll;
+		++vcpu->stat.common.halt_attempted_poll;
 		do {
 			/*
 			 * This sets KVM_REQ_UNHALT if an interrupt
 			 * arrives.
 			 */
 			if (kvm_vcpu_check_block(vcpu) < 0) {
-				++vcpu->stat.halt_successful_poll;
+				++vcpu->stat.common.halt_successful_poll;
 				if (!vcpu_valid_wakeup(vcpu))
-					++vcpu->stat.halt_poll_invalid;
+					++vcpu->stat.common.halt_poll_invalid;
 				goto out;
 			}
 			poll_end = cur = ktime_get();
@@ -3027,7 +3027,7 @@ bool kvm_vcpu_wake_up(struct kvm_vcpu *vcpu)
 	waitp = kvm_arch_vcpu_get_wait(vcpu);
 	if (rcuwait_wake_up(waitp)) {
 		WRITE_ONCE(vcpu->ready, true);
-		++vcpu->stat.halt_wakeup;
+		++vcpu->stat.common.halt_wakeup;
 		return true;
 	}
 
-- 
2.31.1.818.g46aad6cb9e-goog

[PATCH v6 1/4] KVM: stats: Separate common stats from architecture specific ones

[Jing Zhang]

Put all common statistics in a separate structure to ease
statistics handling for the incoming new statistics API.

No functional change intended.

Reviewed-by: David Matlack <dmatlack@google.com>
Reviewed-by: Ricardo Koller <ricarkol@google.com>
Signed-off-by: Jing Zhang <jingzhangos@google.com>
---
 arch/arm64/include/asm/kvm_host.h   |  9 ++-------
 arch/arm64/kvm/guest.c              | 12 ++++++------
 arch/mips/include/asm/kvm_host.h    |  9 ++-------
 arch/mips/kvm/mips.c                | 12 ++++++------
 arch/powerpc/include/asm/kvm_host.h |  9 ++-------
 arch/powerpc/kvm/book3s.c           | 12 ++++++------
 arch/powerpc/kvm/book3s_hv.c        | 12 ++++++------
 arch/powerpc/kvm/book3s_pr.c        |  2 +-
 arch/powerpc/kvm/book3s_pr_papr.c   |  2 +-
 arch/powerpc/kvm/booke.c            | 14 +++++++-------
 arch/s390/include/asm/kvm_host.h    |  9 ++-------
 arch/s390/kvm/kvm-s390.c            | 12 ++++++------
 arch/x86/include/asm/kvm_host.h     |  9 ++-------
 arch/x86/kvm/x86.c                  | 14 +++++++-------
 include/linux/kvm_host.h            |  9 +++++++--
 include/linux/kvm_types.h           | 12 ++++++++++++
 virt/kvm/kvm_main.c                 | 14 +++++++-------
 17 files changed, 82 insertions(+), 90 deletions(-)

diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index 7cd7d5c8c4bc..f3ad7a20b0af 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -556,16 +556,11 @@ static inline bool __vcpu_write_sys_reg_to_cpu(u64 val, int reg)
 }
 
 struct kvm_vm_stat {
-	ulong remote_tlb_flush;
+	struct kvm_vm_stat_common common;
 };
 
 struct kvm_vcpu_stat {
-	u64 halt_successful_poll;
-	u64 halt_attempted_poll;
-	u64 halt_poll_success_ns;
-	u64 halt_poll_fail_ns;
-	u64 halt_poll_invalid;
-	u64 halt_wakeup;
+	struct kvm_vcpu_stat_common common;
 	u64 hvc_exit_stat;
 	u64 wfe_exit_stat;
 	u64 wfi_exit_stat;
diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
index 5cb4a1cd5603..0e41331b0911 100644
--- a/arch/arm64/kvm/guest.c
+++ b/arch/arm64/kvm/guest.c
@@ -29,18 +29,18 @@
 #include "trace.h"
 
 struct kvm_stats_debugfs_item debugfs_entries[] = {
-	VCPU_STAT("halt_successful_poll", halt_successful_poll),
-	VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
-	VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
-	VCPU_STAT("halt_wakeup", halt_wakeup),
+	VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
+	VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
+	VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
+	VCPU_STAT_COM("halt_wakeup", halt_wakeup),
 	VCPU_STAT("hvc_exit_stat", hvc_exit_stat),
 	VCPU_STAT("wfe_exit_stat", wfe_exit_stat),
 	VCPU_STAT("wfi_exit_stat", wfi_exit_stat),
 	VCPU_STAT("mmio_exit_user", mmio_exit_user),
 	VCPU_STAT("mmio_exit_kernel", mmio_exit_kernel),
 	VCPU_STAT("exits", exits),
-	VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
-	VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
+	VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
+	VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
 	{ NULL }
 };
 
diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h
index fca4547d580f..6f610fbcd8d1 100644
--- a/arch/mips/include/asm/kvm_host.h
+++ b/arch/mips/include/asm/kvm_host.h
@@ -109,10 +109,11 @@ static inline bool kvm_is_error_hva(unsigned long addr)
 }
 
 struct kvm_vm_stat {
-	ulong remote_tlb_flush;
+	struct kvm_vm_stat_common common;
 };
 
 struct kvm_vcpu_stat {
+	struct kvm_vcpu_stat_common common;
 	u64 wait_exits;
 	u64 cache_exits;
 	u64 signal_exits;
@@ -142,12 +143,6 @@ struct kvm_vcpu_stat {
 #ifdef CONFIG_CPU_LOONGSON64
 	u64 vz_cpucfg_exits;
 #endif
-	u64 halt_successful_poll;
-	u64 halt_attempted_poll;
-	u64 halt_poll_success_ns;
-	u64 halt_poll_fail_ns;
-	u64 halt_poll_invalid;
-	u64 halt_wakeup;
 };
 
 struct kvm_arch_memory_slot {
diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
index 4d4af97dcc88..f4fc60c05e9c 100644
--- a/arch/mips/kvm/mips.c
+++ b/arch/mips/kvm/mips.c
@@ -68,12 +68,12 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
 #ifdef CONFIG_CPU_LOONGSON64
 	VCPU_STAT("vz_cpucfg", vz_cpucfg_exits),
 #endif
-	VCPU_STAT("halt_successful_poll", halt_successful_poll),
-	VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
-	VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
-	VCPU_STAT("halt_wakeup", halt_wakeup),
-	VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
-	VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
+	VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
+	VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
+	VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
+	VCPU_STAT_COM("halt_wakeup", halt_wakeup),
+	VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
+	VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
 	{NULL}
 };
 
diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
index 1e83359f286b..473d9d0804ff 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -80,12 +80,13 @@ struct kvmppc_book3s_shadow_vcpu;
 struct kvm_nested_guest;
 
 struct kvm_vm_stat {
-	ulong remote_tlb_flush;
+	struct kvm_vm_stat_common common;
 	ulong num_2M_pages;
 	ulong num_1G_pages;
 };
 
 struct kvm_vcpu_stat {
+	struct kvm_vcpu_stat_common common;
 	u64 sum_exits;
 	u64 mmio_exits;
 	u64 signal_exits;
@@ -101,14 +102,8 @@ struct kvm_vcpu_stat {
 	u64 emulated_inst_exits;
 	u64 dec_exits;
 	u64 ext_intr_exits;
-	u64 halt_poll_success_ns;
-	u64 halt_poll_fail_ns;
 	u64 halt_wait_ns;
-	u64 halt_successful_poll;
-	u64 halt_attempted_poll;
 	u64 halt_successful_wait;
-	u64 halt_poll_invalid;
-	u64 halt_wakeup;
 	u64 dbell_exits;
 	u64 gdbell_exits;
 	u64 ld;
diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
index 2b691f4d1f26..bd3a10e1fdaf 100644
--- a/arch/powerpc/kvm/book3s.c
+++ b/arch/powerpc/kvm/book3s.c
@@ -47,14 +47,14 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
 	VCPU_STAT("dec", dec_exits),
 	VCPU_STAT("ext_intr", ext_intr_exits),
 	VCPU_STAT("queue_intr", queue_intr),
-	VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
-	VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
+	VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
+	VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
 	VCPU_STAT("halt_wait_ns", halt_wait_ns),
-	VCPU_STAT("halt_successful_poll", halt_successful_poll),
-	VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
+	VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
+	VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
 	VCPU_STAT("halt_successful_wait", halt_successful_wait),
-	VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
-	VCPU_STAT("halt_wakeup", halt_wakeup),
+	VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
+	VCPU_STAT_COM("halt_wakeup", halt_wakeup),
 	VCPU_STAT("pf_storage", pf_storage),
 	VCPU_STAT("sp_storage", sp_storage),
 	VCPU_STAT("pf_instruc", pf_instruc),
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 28a80d240b76..58e187e03c52 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -236,7 +236,7 @@ static void kvmppc_fast_vcpu_kick_hv(struct kvm_vcpu *vcpu)
 
 	waitp = kvm_arch_vcpu_get_wait(vcpu);
 	if (rcuwait_wake_up(waitp))
-		++vcpu->stat.halt_wakeup;
+		++vcpu->stat.common.halt_wakeup;
 
 	cpu = READ_ONCE(vcpu->arch.thread_cpu);
 	if (cpu >= 0 && kvmppc_ipi_thread(cpu))
@@ -3925,7 +3925,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
 	cur = start_poll = ktime_get();
 	if (vc->halt_poll_ns) {
 		ktime_t stop = ktime_add_ns(start_poll, vc->halt_poll_ns);
-		++vc->runner->stat.halt_attempted_poll;
+		++vc->runner->stat.common.halt_attempted_poll;
 
 		vc->vcore_state = VCORE_POLLING;
 		spin_unlock(&vc->lock);
@@ -3942,7 +3942,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
 		vc->vcore_state = VCORE_INACTIVE;
 
 		if (!do_sleep) {
-			++vc->runner->stat.halt_successful_poll;
+			++vc->runner->stat.common.halt_successful_poll;
 			goto out;
 		}
 	}
@@ -3954,7 +3954,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
 		do_sleep = 0;
 		/* If we polled, count this as a successful poll */
 		if (vc->halt_poll_ns)
-			++vc->runner->stat.halt_successful_poll;
+			++vc->runner->stat.common.halt_successful_poll;
 		goto out;
 	}
 
@@ -3981,13 +3981,13 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
 			ktime_to_ns(cur) - ktime_to_ns(start_wait);
 		/* Attribute failed poll time */
 		if (vc->halt_poll_ns)
-			vc->runner->stat.halt_poll_fail_ns +=
+			vc->runner->stat.common.halt_poll_fail_ns +=
 				ktime_to_ns(start_wait) -
 				ktime_to_ns(start_poll);
 	} else {
 		/* Attribute successful poll time */
 		if (vc->halt_poll_ns)
-			vc->runner->stat.halt_poll_success_ns +=
+			vc->runner->stat.common.halt_poll_success_ns +=
 				ktime_to_ns(cur) -
 				ktime_to_ns(start_poll);
 	}
diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c
index d7733b07f489..214caa9d9675 100644
--- a/arch/powerpc/kvm/book3s_pr.c
+++ b/arch/powerpc/kvm/book3s_pr.c
@@ -493,7 +493,7 @@ static void kvmppc_set_msr_pr(struct kvm_vcpu *vcpu, u64 msr)
 		if (!vcpu->arch.pending_exceptions) {
 			kvm_vcpu_block(vcpu);
 			kvm_clear_request(KVM_REQ_UNHALT, vcpu);
-			vcpu->stat.halt_wakeup++;
+			vcpu->stat.common.halt_wakeup++;
 
 			/* Unset POW bit after we woke up */
 			msr &= ~MSR_POW;
diff --git a/arch/powerpc/kvm/book3s_pr_papr.c b/arch/powerpc/kvm/book3s_pr_papr.c
index 031c8015864a..9384625c8051 100644
--- a/arch/powerpc/kvm/book3s_pr_papr.c
+++ b/arch/powerpc/kvm/book3s_pr_papr.c
@@ -378,7 +378,7 @@ int kvmppc_h_pr(struct kvm_vcpu *vcpu, unsigned long cmd)
 		kvmppc_set_msr_fast(vcpu, kvmppc_get_msr(vcpu) | MSR_EE);
 		kvm_vcpu_block(vcpu);
 		kvm_clear_request(KVM_REQ_UNHALT, vcpu);
-		vcpu->stat.halt_wakeup++;
+		vcpu->stat.common.halt_wakeup++;
 		return EMULATE_DONE;
 	case H_LOGICAL_CI_LOAD:
 		return kvmppc_h_pr_logical_ci_load(vcpu);
diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
index 7d5fe43f85c4..07fdd7a1254a 100644
--- a/arch/powerpc/kvm/booke.c
+++ b/arch/powerpc/kvm/booke.c
@@ -49,15 +49,15 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
 	VCPU_STAT("inst_emu", emulated_inst_exits),
 	VCPU_STAT("dec", dec_exits),
 	VCPU_STAT("ext_intr", ext_intr_exits),
-	VCPU_STAT("halt_successful_poll", halt_successful_poll),
-	VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
-	VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
-	VCPU_STAT("halt_wakeup", halt_wakeup),
+	VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
+	VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
+	VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
+	VCPU_STAT_COM("halt_wakeup", halt_wakeup),
 	VCPU_STAT("doorbell", dbell_exits),
 	VCPU_STAT("guest doorbell", gdbell_exits),
-	VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
-	VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
-	VM_STAT("remote_tlb_flush", remote_tlb_flush),
+	VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
+	VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
+	VM_STAT_COM("remote_tlb_flush", remote_tlb_flush),
 	{ NULL }
 };
 
diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
index 8925f3969478..57a20897f3db 100644
--- a/arch/s390/include/asm/kvm_host.h
+++ b/arch/s390/include/asm/kvm_host.h
@@ -361,6 +361,7 @@ struct sie_page {
 };
 
 struct kvm_vcpu_stat {
+	struct kvm_vcpu_stat_common common;
 	u64 exit_userspace;
 	u64 exit_null;
 	u64 exit_external_request;
@@ -370,13 +371,7 @@ struct kvm_vcpu_stat {
 	u64 exit_validity;
 	u64 exit_instruction;
 	u64 exit_pei;
-	u64 halt_successful_poll;
-	u64 halt_attempted_poll;
-	u64 halt_poll_invalid;
 	u64 halt_no_poll_steal;
-	u64 halt_wakeup;
-	u64 halt_poll_success_ns;
-	u64 halt_poll_fail_ns;
 	u64 instruction_lctl;
 	u64 instruction_lctlg;
 	u64 instruction_stctl;
@@ -755,12 +750,12 @@ struct kvm_vcpu_arch {
 };
 
 struct kvm_vm_stat {
+	struct kvm_vm_stat_common common;
 	u64 inject_io;
 	u64 inject_float_mchk;
 	u64 inject_pfault_done;
 	u64 inject_service_signal;
 	u64 inject_virtio;
-	u64 remote_tlb_flush;
 };
 
 struct kvm_arch_memory_slot {
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 1296fc10f80c..d6bf3372bb10 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -72,13 +72,13 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
 	VCPU_STAT("exit_program_interruption", exit_program_interruption),
 	VCPU_STAT("exit_instr_and_program_int", exit_instr_and_program),
 	VCPU_STAT("exit_operation_exception", exit_operation_exception),
-	VCPU_STAT("halt_successful_poll", halt_successful_poll),
-	VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
-	VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
+	VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
+	VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
+	VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
 	VCPU_STAT("halt_no_poll_steal", halt_no_poll_steal),
-	VCPU_STAT("halt_wakeup", halt_wakeup),
-	VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
-	VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
+	VCPU_STAT_COM("halt_wakeup", halt_wakeup),
+	VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
+	VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
 	VCPU_STAT("instruction_lctlg", instruction_lctlg),
 	VCPU_STAT("instruction_lctl", instruction_lctl),
 	VCPU_STAT("instruction_stctl", instruction_stctl),
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 55efbacfc244..5bfd6893fbf6 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1127,6 +1127,7 @@ struct kvm_arch {
 };
 
 struct kvm_vm_stat {
+	struct kvm_vm_stat_common common;
 	ulong mmu_shadow_zapped;
 	ulong mmu_pte_write;
 	ulong mmu_pde_zapped;
@@ -1134,13 +1135,13 @@ struct kvm_vm_stat {
 	ulong mmu_recycled;
 	ulong mmu_cache_miss;
 	ulong mmu_unsync;
-	ulong remote_tlb_flush;
 	ulong lpages;
 	ulong nx_lpage_splits;
 	ulong max_mmu_page_hash_collisions;
 };
 
 struct kvm_vcpu_stat {
+	struct kvm_vcpu_stat_common common;
 	u64 pf_fixed;
 	u64 pf_guest;
 	u64 tlb_flush;
@@ -1154,10 +1155,6 @@ struct kvm_vcpu_stat {
 	u64 nmi_window_exits;
 	u64 l1d_flush;
 	u64 halt_exits;
-	u64 halt_successful_poll;
-	u64 halt_attempted_poll;
-	u64 halt_poll_invalid;
-	u64 halt_wakeup;
 	u64 request_irq_exits;
 	u64 irq_exits;
 	u64 host_state_reload;
@@ -1168,8 +1165,6 @@ struct kvm_vcpu_stat {
 	u64 irq_injections;
 	u64 nmi_injections;
 	u64 req_event;
-	u64 halt_poll_success_ns;
-	u64 halt_poll_fail_ns;
 	u64 nested_run;
 	u64 directed_yield_attempted;
 	u64 directed_yield_successful;
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 9b6bca616929..9a93d80caff6 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -226,10 +226,10 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
 	VCPU_STAT("irq_window", irq_window_exits),
 	VCPU_STAT("nmi_window", nmi_window_exits),
 	VCPU_STAT("halt_exits", halt_exits),
-	VCPU_STAT("halt_successful_poll", halt_successful_poll),
-	VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
-	VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
-	VCPU_STAT("halt_wakeup", halt_wakeup),
+	VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
+	VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
+	VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
+	VCPU_STAT_COM("halt_wakeup", halt_wakeup),
 	VCPU_STAT("hypercalls", hypercalls),
 	VCPU_STAT("request_irq", request_irq_exits),
 	VCPU_STAT("irq_exits", irq_exits),
@@ -241,8 +241,8 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
 	VCPU_STAT("nmi_injections", nmi_injections),
 	VCPU_STAT("req_event", req_event),
 	VCPU_STAT("l1d_flush", l1d_flush),
-	VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
-	VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
+	VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
+	VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
 	VCPU_STAT("nested_run", nested_run),
 	VCPU_STAT("directed_yield_attempted", directed_yield_attempted),
 	VCPU_STAT("directed_yield_successful", directed_yield_successful),
@@ -253,7 +253,7 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
 	VM_STAT("mmu_recycled", mmu_recycled),
 	VM_STAT("mmu_cache_miss", mmu_cache_miss),
 	VM_STAT("mmu_unsync", mmu_unsync),
-	VM_STAT("remote_tlb_flush", remote_tlb_flush),
+	VM_STAT_COM("remote_tlb_flush", remote_tlb_flush),
 	VM_STAT("largepages", lpages, .mode = 0444),
 	VM_STAT("nx_largepages_splitted", nx_lpage_splits, .mode = 0444),
 	VM_STAT("max_mmu_page_hash_collisions", max_mmu_page_hash_collisions),
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 2f34487e21f2..97700e41db3b 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -1243,10 +1243,15 @@ struct kvm_stats_debugfs_item {
 #define KVM_DBGFS_GET_MODE(dbgfs_item)                                         \
 	((dbgfs_item)->mode ? (dbgfs_item)->mode : 0644)
 
-#define VM_STAT(n, x, ...) 							\
+#define VM_STAT(n, x, ...)						       \
 	{ n, offsetof(struct kvm, stat.x), KVM_STAT_VM, ## __VA_ARGS__ }
-#define VCPU_STAT(n, x, ...)							\
+#define VCPU_STAT(n, x, ...)						       \
 	{ n, offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU, ## __VA_ARGS__ }
+#define VM_STAT_COM(n, x, ...)						       \
+	{ n, offsetof(struct kvm, stat.common.x), KVM_STAT_VM, ## __VA_ARGS__ }
+#define VCPU_STAT_COM(n, x, ...)					       \
+	{ n, offsetof(struct kvm_vcpu, stat.common.x),			       \
+	  KVM_STAT_VCPU, ## __VA_ARGS__ }
 
 extern struct kvm_stats_debugfs_item debugfs_entries[];
 extern struct dentry *kvm_debugfs_dir;
diff --git a/include/linux/kvm_types.h b/include/linux/kvm_types.h
index a7580f69dda0..87eb05ad678b 100644
--- a/include/linux/kvm_types.h
+++ b/include/linux/kvm_types.h
@@ -76,5 +76,17 @@ struct kvm_mmu_memory_cache {
 };
 #endif
 
+struct kvm_vm_stat_common {
+	ulong remote_tlb_flush;
+};
+
+struct kvm_vcpu_stat_common {
+	u64 halt_successful_poll;
+	u64 halt_attempted_poll;
+	u64 halt_poll_invalid;
+	u64 halt_wakeup;
+	u64 halt_poll_success_ns;
+	u64 halt_poll_fail_ns;
+};
 
 #endif /* __KVM_TYPES_H__ */
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 6b4feb92dc79..34a4cf265297 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -330,7 +330,7 @@ void kvm_flush_remote_tlbs(struct kvm *kvm)
 	 */
 	if (!kvm_arch_flush_remote_tlb(kvm)
 	    || kvm_make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
-		++kvm->stat.remote_tlb_flush;
+		++kvm->stat.common.remote_tlb_flush;
 	cmpxchg(&kvm->tlbs_dirty, dirty_count, 0);
 }
 EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs);
@@ -2940,9 +2940,9 @@ static inline void
 update_halt_poll_stats(struct kvm_vcpu *vcpu, u64 poll_ns, bool waited)
 {
 	if (waited)
-		vcpu->stat.halt_poll_fail_ns += poll_ns;
+		vcpu->stat.common.halt_poll_fail_ns += poll_ns;
 	else
-		vcpu->stat.halt_poll_success_ns += poll_ns;
+		vcpu->stat.common.halt_poll_success_ns += poll_ns;
 }
 
 /*
@@ -2960,16 +2960,16 @@ void kvm_vcpu_block(struct kvm_vcpu *vcpu)
 	if (vcpu->halt_poll_ns && !kvm_arch_no_poll(vcpu)) {
 		ktime_t stop = ktime_add_ns(ktime_get(), vcpu->halt_poll_ns);
 
-		++vcpu->stat.halt_attempted_poll;
+		++vcpu->stat.common.halt_attempted_poll;
 		do {
 			/*
 			 * This sets KVM_REQ_UNHALT if an interrupt
 			 * arrives.
 			 */
 			if (kvm_vcpu_check_block(vcpu) < 0) {
-				++vcpu->stat.halt_successful_poll;
+				++vcpu->stat.common.halt_successful_poll;
 				if (!vcpu_valid_wakeup(vcpu))
-					++vcpu->stat.halt_poll_invalid;
+					++vcpu->stat.common.halt_poll_invalid;
 				goto out;
 			}
 			poll_end = cur = ktime_get();
@@ -3027,7 +3027,7 @@ bool kvm_vcpu_wake_up(struct kvm_vcpu *vcpu)
 	waitp = kvm_arch_vcpu_get_wait(vcpu);
 	if (rcuwait_wake_up(waitp)) {
 		WRITE_ONCE(vcpu->ready, true);
-		++vcpu->stat.halt_wakeup;
+		++vcpu->stat.common.halt_wakeup;
 		return true;
 	}
 
-- 
2.31.1.818.g46aad6cb9e-goog

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kvmarm@lists.cs.columbia.edu
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Re: [PATCH v6 1/4] KVM: stats: Separate common stats from architecture specific ones

[Krish Sadhukhan]

On 5/24/21 8:18 AM, Jing Zhang wrote:
> Put all common statistics in a separate structure to ease
> statistics handling for the incoming new statistics API.
>
> No functional change intended.
>
> Reviewed-by: David Matlack <dmatlack@google.com>
> Reviewed-by: Ricardo Koller <ricarkol@google.com>
> Signed-off-by: Jing Zhang <jingzhangos@google.com>
> ---
>   arch/arm64/include/asm/kvm_host.h   |  9 ++-------
>   arch/arm64/kvm/guest.c              | 12 ++++++------
>   arch/mips/include/asm/kvm_host.h    |  9 ++-------
>   arch/mips/kvm/mips.c                | 12 ++++++------
>   arch/powerpc/include/asm/kvm_host.h |  9 ++-------
>   arch/powerpc/kvm/book3s.c           | 12 ++++++------
>   arch/powerpc/kvm/book3s_hv.c        | 12 ++++++------
>   arch/powerpc/kvm/book3s_pr.c        |  2 +-
>   arch/powerpc/kvm/book3s_pr_papr.c   |  2 +-
>   arch/powerpc/kvm/booke.c            | 14 +++++++-------
>   arch/s390/include/asm/kvm_host.h    |  9 ++-------
>   arch/s390/kvm/kvm-s390.c            | 12 ++++++------
>   arch/x86/include/asm/kvm_host.h     |  9 ++-------
>   arch/x86/kvm/x86.c                  | 14 +++++++-------
>   include/linux/kvm_host.h            |  9 +++++++--
>   include/linux/kvm_types.h           | 12 ++++++++++++
>   virt/kvm/kvm_main.c                 | 14 +++++++-------
>   17 files changed, 82 insertions(+), 90 deletions(-)
>
> diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
> index 7cd7d5c8c4bc..f3ad7a20b0af 100644
> --- a/arch/arm64/include/asm/kvm_host.h
> +++ b/arch/arm64/include/asm/kvm_host.h
> @@ -556,16 +556,11 @@ static inline bool __vcpu_write_sys_reg_to_cpu(u64 val, int reg)
>   }
>   
>   struct kvm_vm_stat {
> -	ulong remote_tlb_flush;
> +	struct kvm_vm_stat_common common;
>   };
>   
>   struct kvm_vcpu_stat {
> -	u64 halt_successful_poll;
> -	u64 halt_attempted_poll;
> -	u64 halt_poll_success_ns;
> -	u64 halt_poll_fail_ns;
> -	u64 halt_poll_invalid;
> -	u64 halt_wakeup;
> +	struct kvm_vcpu_stat_common common;
>   	u64 hvc_exit_stat;
>   	u64 wfe_exit_stat;
>   	u64 wfi_exit_stat;
> diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
> index 5cb4a1cd5603..0e41331b0911 100644
> --- a/arch/arm64/kvm/guest.c
> +++ b/arch/arm64/kvm/guest.c
> @@ -29,18 +29,18 @@
>   #include "trace.h"
>   
>   struct kvm_stats_debugfs_item debugfs_entries[] = {
> -	VCPU_STAT("halt_successful_poll", halt_successful_poll),
> -	VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> -	VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> -	VCPU_STAT("halt_wakeup", halt_wakeup),
> +	VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> +	VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> +	VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> +	VCPU_STAT_COM("halt_wakeup", halt_wakeup),
>   	VCPU_STAT("hvc_exit_stat", hvc_exit_stat),
>   	VCPU_STAT("wfe_exit_stat", wfe_exit_stat),
>   	VCPU_STAT("wfi_exit_stat", wfi_exit_stat),
>   	VCPU_STAT("mmio_exit_user", mmio_exit_user),
>   	VCPU_STAT("mmio_exit_kernel", mmio_exit_kernel),
>   	VCPU_STAT("exits", exits),
> -	VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> -	VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> +	VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> +	VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
>   	{ NULL }
>   };
>   
> diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h
> index fca4547d580f..6f610fbcd8d1 100644
> --- a/arch/mips/include/asm/kvm_host.h
> +++ b/arch/mips/include/asm/kvm_host.h
> @@ -109,10 +109,11 @@ static inline bool kvm_is_error_hva(unsigned long addr)
>   }
>   
>   struct kvm_vm_stat {
> -	ulong remote_tlb_flush;
> +	struct kvm_vm_stat_common common;
>   };
>   
>   struct kvm_vcpu_stat {
> +	struct kvm_vcpu_stat_common common;
>   	u64 wait_exits;
>   	u64 cache_exits;
>   	u64 signal_exits;
> @@ -142,12 +143,6 @@ struct kvm_vcpu_stat {
>   #ifdef CONFIG_CPU_LOONGSON64
>   	u64 vz_cpucfg_exits;
>   #endif
> -	u64 halt_successful_poll;
> -	u64 halt_attempted_poll;
> -	u64 halt_poll_success_ns;
> -	u64 halt_poll_fail_ns;
> -	u64 halt_poll_invalid;
> -	u64 halt_wakeup;
>   };
>   
>   struct kvm_arch_memory_slot {
> diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
> index 4d4af97dcc88..f4fc60c05e9c 100644
> --- a/arch/mips/kvm/mips.c
> +++ b/arch/mips/kvm/mips.c
> @@ -68,12 +68,12 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>   #ifdef CONFIG_CPU_LOONGSON64
>   	VCPU_STAT("vz_cpucfg", vz_cpucfg_exits),
>   #endif
> -	VCPU_STAT("halt_successful_poll", halt_successful_poll),
> -	VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> -	VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> -	VCPU_STAT("halt_wakeup", halt_wakeup),
> -	VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> -	VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> +	VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> +	VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> +	VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> +	VCPU_STAT_COM("halt_wakeup", halt_wakeup),
> +	VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> +	VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
>   	{NULL}
>   };
>   
> diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
> index 1e83359f286b..473d9d0804ff 100644
> --- a/arch/powerpc/include/asm/kvm_host.h
> +++ b/arch/powerpc/include/asm/kvm_host.h
> @@ -80,12 +80,13 @@ struct kvmppc_book3s_shadow_vcpu;
>   struct kvm_nested_guest;
>   
>   struct kvm_vm_stat {
> -	ulong remote_tlb_flush;
> +	struct kvm_vm_stat_common common;
>   	ulong num_2M_pages;
>   	ulong num_1G_pages;
>   };
>   
>   struct kvm_vcpu_stat {
> +	struct kvm_vcpu_stat_common common;
>   	u64 sum_exits;
>   	u64 mmio_exits;
>   	u64 signal_exits;
> @@ -101,14 +102,8 @@ struct kvm_vcpu_stat {
>   	u64 emulated_inst_exits;
>   	u64 dec_exits;
>   	u64 ext_intr_exits;
> -	u64 halt_poll_success_ns;
> -	u64 halt_poll_fail_ns;
>   	u64 halt_wait_ns;
> -	u64 halt_successful_poll;
> -	u64 halt_attempted_poll;
>   	u64 halt_successful_wait;
> -	u64 halt_poll_invalid;
> -	u64 halt_wakeup;
>   	u64 dbell_exits;
>   	u64 gdbell_exits;
>   	u64 ld;
> diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
> index 2b691f4d1f26..bd3a10e1fdaf 100644
> --- a/arch/powerpc/kvm/book3s.c
> +++ b/arch/powerpc/kvm/book3s.c
> @@ -47,14 +47,14 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>   	VCPU_STAT("dec", dec_exits),
>   	VCPU_STAT("ext_intr", ext_intr_exits),
>   	VCPU_STAT("queue_intr", queue_intr),
> -	VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> -	VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> +	VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> +	VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
>   	VCPU_STAT("halt_wait_ns", halt_wait_ns),
> -	VCPU_STAT("halt_successful_poll", halt_successful_poll),
> -	VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> +	VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> +	VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
>   	VCPU_STAT("halt_successful_wait", halt_successful_wait),
> -	VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> -	VCPU_STAT("halt_wakeup", halt_wakeup),
> +	VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> +	VCPU_STAT_COM("halt_wakeup", halt_wakeup),
>   	VCPU_STAT("pf_storage", pf_storage),
>   	VCPU_STAT("sp_storage", sp_storage),
>   	VCPU_STAT("pf_instruc", pf_instruc),
> diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
> index 28a80d240b76..58e187e03c52 100644
> --- a/arch/powerpc/kvm/book3s_hv.c
> +++ b/arch/powerpc/kvm/book3s_hv.c
> @@ -236,7 +236,7 @@ static void kvmppc_fast_vcpu_kick_hv(struct kvm_vcpu *vcpu)
>   
>   	waitp = kvm_arch_vcpu_get_wait(vcpu);
>   	if (rcuwait_wake_up(waitp))
> -		++vcpu->stat.halt_wakeup;
> +		++vcpu->stat.common.halt_wakeup;
>   
>   	cpu = READ_ONCE(vcpu->arch.thread_cpu);
>   	if (cpu >= 0 && kvmppc_ipi_thread(cpu))
> @@ -3925,7 +3925,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
>   	cur = start_poll = ktime_get();
>   	if (vc->halt_poll_ns) {
>   		ktime_t stop = ktime_add_ns(start_poll, vc->halt_poll_ns);
> -		++vc->runner->stat.halt_attempted_poll;
> +		++vc->runner->stat.common.halt_attempted_poll;
>   
>   		vc->vcore_state = VCORE_POLLING;
>   		spin_unlock(&vc->lock);
> @@ -3942,7 +3942,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
>   		vc->vcore_state = VCORE_INACTIVE;
>   
>   		if (!do_sleep) {
> -			++vc->runner->stat.halt_successful_poll;
> +			++vc->runner->stat.common.halt_successful_poll;
>   			goto out;
>   		}
>   	}
> @@ -3954,7 +3954,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
>   		do_sleep = 0;
>   		/* If we polled, count this as a successful poll */
>   		if (vc->halt_poll_ns)
> -			++vc->runner->stat.halt_successful_poll;
> +			++vc->runner->stat.common.halt_successful_poll;
>   		goto out;
>   	}
>   
> @@ -3981,13 +3981,13 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
>   			ktime_to_ns(cur) - ktime_to_ns(start_wait);
>   		/* Attribute failed poll time */
>   		if (vc->halt_poll_ns)
> -			vc->runner->stat.halt_poll_fail_ns +=
> +			vc->runner->stat.common.halt_poll_fail_ns +=
>   				ktime_to_ns(start_wait) -
>   				ktime_to_ns(start_poll);
>   	} else {
>   		/* Attribute successful poll time */
>   		if (vc->halt_poll_ns)
> -			vc->runner->stat.halt_poll_success_ns +=
> +			vc->runner->stat.common.halt_poll_success_ns +=
>   				ktime_to_ns(cur) -
>   				ktime_to_ns(start_poll);
>   	}
> diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c
> index d7733b07f489..214caa9d9675 100644
> --- a/arch/powerpc/kvm/book3s_pr.c
> +++ b/arch/powerpc/kvm/book3s_pr.c
> @@ -493,7 +493,7 @@ static void kvmppc_set_msr_pr(struct kvm_vcpu *vcpu, u64 msr)
>   		if (!vcpu->arch.pending_exceptions) {
>   			kvm_vcpu_block(vcpu);
>   			kvm_clear_request(KVM_REQ_UNHALT, vcpu);
> -			vcpu->stat.halt_wakeup++;
> +			vcpu->stat.common.halt_wakeup++;
>   
>   			/* Unset POW bit after we woke up */
>   			msr &= ~MSR_POW;
> diff --git a/arch/powerpc/kvm/book3s_pr_papr.c b/arch/powerpc/kvm/book3s_pr_papr.c
> index 031c8015864a..9384625c8051 100644
> --- a/arch/powerpc/kvm/book3s_pr_papr.c
> +++ b/arch/powerpc/kvm/book3s_pr_papr.c
> @@ -378,7 +378,7 @@ int kvmppc_h_pr(struct kvm_vcpu *vcpu, unsigned long cmd)
>   		kvmppc_set_msr_fast(vcpu, kvmppc_get_msr(vcpu) | MSR_EE);
>   		kvm_vcpu_block(vcpu);
>   		kvm_clear_request(KVM_REQ_UNHALT, vcpu);
> -		vcpu->stat.halt_wakeup++;
> +		vcpu->stat.common.halt_wakeup++;
>   		return EMULATE_DONE;
>   	case H_LOGICAL_CI_LOAD:
>   		return kvmppc_h_pr_logical_ci_load(vcpu);
> diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
> index 7d5fe43f85c4..07fdd7a1254a 100644
> --- a/arch/powerpc/kvm/booke.c
> +++ b/arch/powerpc/kvm/booke.c
> @@ -49,15 +49,15 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>   	VCPU_STAT("inst_emu", emulated_inst_exits),
>   	VCPU_STAT("dec", dec_exits),
>   	VCPU_STAT("ext_intr", ext_intr_exits),
> -	VCPU_STAT("halt_successful_poll", halt_successful_poll),
> -	VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> -	VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> -	VCPU_STAT("halt_wakeup", halt_wakeup),
> +	VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> +	VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> +	VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> +	VCPU_STAT_COM("halt_wakeup", halt_wakeup),
>   	VCPU_STAT("doorbell", dbell_exits),
>   	VCPU_STAT("guest doorbell", gdbell_exits),
> -	VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> -	VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> -	VM_STAT("remote_tlb_flush", remote_tlb_flush),
> +	VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> +	VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
> +	VM_STAT_COM("remote_tlb_flush", remote_tlb_flush),
>   	{ NULL }
>   };
>   
> diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
> index 8925f3969478..57a20897f3db 100644
> --- a/arch/s390/include/asm/kvm_host.h
> +++ b/arch/s390/include/asm/kvm_host.h
> @@ -361,6 +361,7 @@ struct sie_page {
>   };
>   
>   struct kvm_vcpu_stat {
> +	struct kvm_vcpu_stat_common common;
>   	u64 exit_userspace;
>   	u64 exit_null;
>   	u64 exit_external_request;
> @@ -370,13 +371,7 @@ struct kvm_vcpu_stat {
>   	u64 exit_validity;
>   	u64 exit_instruction;
>   	u64 exit_pei;
> -	u64 halt_successful_poll;
> -	u64 halt_attempted_poll;
> -	u64 halt_poll_invalid;
>   	u64 halt_no_poll_steal;
> -	u64 halt_wakeup;
> -	u64 halt_poll_success_ns;
> -	u64 halt_poll_fail_ns;
>   	u64 instruction_lctl;
>   	u64 instruction_lctlg;
>   	u64 instruction_stctl;
> @@ -755,12 +750,12 @@ struct kvm_vcpu_arch {
>   };
>   
>   struct kvm_vm_stat {
> +	struct kvm_vm_stat_common common;
>   	u64 inject_io;
>   	u64 inject_float_mchk;
>   	u64 inject_pfault_done;
>   	u64 inject_service_signal;
>   	u64 inject_virtio;
> -	u64 remote_tlb_flush;
>   };
>   
>   struct kvm_arch_memory_slot {
> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> index 1296fc10f80c..d6bf3372bb10 100644
> --- a/arch/s390/kvm/kvm-s390.c
> +++ b/arch/s390/kvm/kvm-s390.c
> @@ -72,13 +72,13 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>   	VCPU_STAT("exit_program_interruption", exit_program_interruption),
>   	VCPU_STAT("exit_instr_and_program_int", exit_instr_and_program),
>   	VCPU_STAT("exit_operation_exception", exit_operation_exception),
> -	VCPU_STAT("halt_successful_poll", halt_successful_poll),
> -	VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> -	VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> +	VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> +	VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> +	VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
>   	VCPU_STAT("halt_no_poll_steal", halt_no_poll_steal),
> -	VCPU_STAT("halt_wakeup", halt_wakeup),
> -	VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> -	VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> +	VCPU_STAT_COM("halt_wakeup", halt_wakeup),
> +	VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> +	VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
>   	VCPU_STAT("instruction_lctlg", instruction_lctlg),
>   	VCPU_STAT("instruction_lctl", instruction_lctl),
>   	VCPU_STAT("instruction_stctl", instruction_stctl),
> diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
> index 55efbacfc244..5bfd6893fbf6 100644
> --- a/arch/x86/include/asm/kvm_host.h
> +++ b/arch/x86/include/asm/kvm_host.h
> @@ -1127,6 +1127,7 @@ struct kvm_arch {
>   };
>   
>   struct kvm_vm_stat {
> +	struct kvm_vm_stat_common common;
>   	ulong mmu_shadow_zapped;
>   	ulong mmu_pte_write;
>   	ulong mmu_pde_zapped;
> @@ -1134,13 +1135,13 @@ struct kvm_vm_stat {
>   	ulong mmu_recycled;
>   	ulong mmu_cache_miss;
>   	ulong mmu_unsync;
> -	ulong remote_tlb_flush;
>   	ulong lpages;
>   	ulong nx_lpage_splits;
>   	ulong max_mmu_page_hash_collisions;
>   };
>   
>   struct kvm_vcpu_stat {
> +	struct kvm_vcpu_stat_common common;
>   	u64 pf_fixed;
>   	u64 pf_guest;
>   	u64 tlb_flush;
> @@ -1154,10 +1155,6 @@ struct kvm_vcpu_stat {
>   	u64 nmi_window_exits;
>   	u64 l1d_flush;
>   	u64 halt_exits;
> -	u64 halt_successful_poll;
> -	u64 halt_attempted_poll;
> -	u64 halt_poll_invalid;
> -	u64 halt_wakeup;
>   	u64 request_irq_exits;
>   	u64 irq_exits;
>   	u64 host_state_reload;
> @@ -1168,8 +1165,6 @@ struct kvm_vcpu_stat {
>   	u64 irq_injections;
>   	u64 nmi_injections;
>   	u64 req_event;
> -	u64 halt_poll_success_ns;
> -	u64 halt_poll_fail_ns;
>   	u64 nested_run;
>   	u64 directed_yield_attempted;
>   	u64 directed_yield_successful;
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index 9b6bca616929..9a93d80caff6 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -226,10 +226,10 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>   	VCPU_STAT("irq_window", irq_window_exits),
>   	VCPU_STAT("nmi_window", nmi_window_exits),
>   	VCPU_STAT("halt_exits", halt_exits),
> -	VCPU_STAT("halt_successful_poll", halt_successful_poll),
> -	VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> -	VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> -	VCPU_STAT("halt_wakeup", halt_wakeup),
> +	VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> +	VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> +	VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> +	VCPU_STAT_COM("halt_wakeup", halt_wakeup),
>   	VCPU_STAT("hypercalls", hypercalls),
>   	VCPU_STAT("request_irq", request_irq_exits),
>   	VCPU_STAT("irq_exits", irq_exits),
> @@ -241,8 +241,8 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>   	VCPU_STAT("nmi_injections", nmi_injections),
>   	VCPU_STAT("req_event", req_event),
>   	VCPU_STAT("l1d_flush", l1d_flush),
> -	VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> -	VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> +	VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> +	VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
>   	VCPU_STAT("nested_run", nested_run),
>   	VCPU_STAT("directed_yield_attempted", directed_yield_attempted),
>   	VCPU_STAT("directed_yield_successful", directed_yield_successful),
> @@ -253,7 +253,7 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>   	VM_STAT("mmu_recycled", mmu_recycled),
>   	VM_STAT("mmu_cache_miss", mmu_cache_miss),
>   	VM_STAT("mmu_unsync", mmu_unsync),
> -	VM_STAT("remote_tlb_flush", remote_tlb_flush),
> +	VM_STAT_COM("remote_tlb_flush", remote_tlb_flush),
>   	VM_STAT("largepages", lpages, .mode = 0444),
>   	VM_STAT("nx_largepages_splitted", nx_lpage_splits, .mode = 0444),
>   	VM_STAT("max_mmu_page_hash_collisions", max_mmu_page_hash_collisions),
> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> index 2f34487e21f2..97700e41db3b 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -1243,10 +1243,15 @@ struct kvm_stats_debugfs_item {
>   #define KVM_DBGFS_GET_MODE(dbgfs_item)                                         \
>   	((dbgfs_item)->mode ? (dbgfs_item)->mode : 0644)
>   
> -#define VM_STAT(n, x, ...) 							\
> +#define VM_STAT(n, x, ...)						       \
>   	{ n, offsetof(struct kvm, stat.x), KVM_STAT_VM, ## __VA_ARGS__ }
> -#define VCPU_STAT(n, x, ...)							\
> +#define VCPU_STAT(n, x, ...)						       \
>   	{ n, offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU, ## __VA_ARGS__ }
> +#define VM_STAT_COM(n, x, ...)						       \
> +	{ n, offsetof(struct kvm, stat.common.x), KVM_STAT_VM, ## __VA_ARGS__ }
> +#define VCPU_STAT_COM(n, x, ...)					       \
> +	{ n, offsetof(struct kvm_vcpu, stat.common.x),			       \
> +	  KVM_STAT_VCPU, ## __VA_ARGS__ }
>   
>   extern struct kvm_stats_debugfs_item debugfs_entries[];
>   extern struct dentry *kvm_debugfs_dir;
> diff --git a/include/linux/kvm_types.h b/include/linux/kvm_types.h
> index a7580f69dda0..87eb05ad678b 100644
> --- a/include/linux/kvm_types.h
> +++ b/include/linux/kvm_types.h
> @@ -76,5 +76,17 @@ struct kvm_mmu_memory_cache {
>   };
>   #endif
>   
> +struct kvm_vm_stat_common {


Should this be named as 'kvm_vm_stat_generic' by following the 
convention in kvm_main.c ?  For example, kvm_vm_ioctl_enable_cap()  vs.  
kvm_vm_ioctl_enable_cap_generic().

> +	ulong remote_tlb_flush;
> +};
> +
> +struct kvm_vcpu_stat_common {


Same comment as above.

> +	u64 halt_successful_poll;
> +	u64 halt_attempted_poll;
> +	u64 halt_poll_invalid;
> +	u64 halt_wakeup;
> +	u64 halt_poll_success_ns;
> +	u64 halt_poll_fail_ns;
> +};
>   
>   #endif /* __KVM_TYPES_H__ */
> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> index 6b4feb92dc79..34a4cf265297 100644
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -330,7 +330,7 @@ void kvm_flush_remote_tlbs(struct kvm *kvm)
>   	 */
>   	if (!kvm_arch_flush_remote_tlb(kvm)
>   	    || kvm_make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
> -		++kvm->stat.remote_tlb_flush;
> +		++kvm->stat.common.remote_tlb_flush;
>   	cmpxchg(&kvm->tlbs_dirty, dirty_count, 0);
>   }
>   EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs);
> @@ -2940,9 +2940,9 @@ static inline void
>   update_halt_poll_stats(struct kvm_vcpu *vcpu, u64 poll_ns, bool waited)
>   {
>   	if (waited)
> -		vcpu->stat.halt_poll_fail_ns += poll_ns;
> +		vcpu->stat.common.halt_poll_fail_ns += poll_ns;
>   	else
> -		vcpu->stat.halt_poll_success_ns += poll_ns;
> +		vcpu->stat.common.halt_poll_success_ns += poll_ns;
>   }
>   
>   /*
> @@ -2960,16 +2960,16 @@ void kvm_vcpu_block(struct kvm_vcpu *vcpu)
>   	if (vcpu->halt_poll_ns && !kvm_arch_no_poll(vcpu)) {
>   		ktime_t stop = ktime_add_ns(ktime_get(), vcpu->halt_poll_ns);
>   
> -		++vcpu->stat.halt_attempted_poll;
> +		++vcpu->stat.common.halt_attempted_poll;
>   		do {
>   			/*
>   			 * This sets KVM_REQ_UNHALT if an interrupt
>   			 * arrives.
>   			 */
>   			if (kvm_vcpu_check_block(vcpu) < 0) {
> -				++vcpu->stat.halt_successful_poll;
> +				++vcpu->stat.common.halt_successful_poll;
>   				if (!vcpu_valid_wakeup(vcpu))
> -					++vcpu->stat.halt_poll_invalid;
> +					++vcpu->stat.common.halt_poll_invalid;
>   				goto out;
>   			}
>   			poll_end = cur = ktime_get();
> @@ -3027,7 +3027,7 @@ bool kvm_vcpu_wake_up(struct kvm_vcpu *vcpu)
>   	waitp = kvm_arch_vcpu_get_wait(vcpu);
>   	if (rcuwait_wake_up(waitp)) {
>   		WRITE_ONCE(vcpu->ready, true);
> -		++vcpu->stat.halt_wakeup;
> +		++vcpu->stat.common.halt_wakeup;
>   		return true;
>   	}
>   

Re: [PATCH v6 1/4] KVM: stats: Separate common stats from architecture specific ones

[Krish Sadhukhan]

On 5/24/21 8:18 AM, Jing Zhang wrote:
> Put all common statistics in a separate structure to ease
> statistics handling for the incoming new statistics API.
>
> No functional change intended.
>
> Reviewed-by: David Matlack <dmatlack@google.com>
> Reviewed-by: Ricardo Koller <ricarkol@google.com>
> Signed-off-by: Jing Zhang <jingzhangos@google.com>
> ---
>   arch/arm64/include/asm/kvm_host.h   |  9 ++-------
>   arch/arm64/kvm/guest.c              | 12 ++++++------
>   arch/mips/include/asm/kvm_host.h    |  9 ++-------
>   arch/mips/kvm/mips.c                | 12 ++++++------
>   arch/powerpc/include/asm/kvm_host.h |  9 ++-------
>   arch/powerpc/kvm/book3s.c           | 12 ++++++------
>   arch/powerpc/kvm/book3s_hv.c        | 12 ++++++------
>   arch/powerpc/kvm/book3s_pr.c        |  2 +-
>   arch/powerpc/kvm/book3s_pr_papr.c   |  2 +-
>   arch/powerpc/kvm/booke.c            | 14 +++++++-------
>   arch/s390/include/asm/kvm_host.h    |  9 ++-------
>   arch/s390/kvm/kvm-s390.c            | 12 ++++++------
>   arch/x86/include/asm/kvm_host.h     |  9 ++-------
>   arch/x86/kvm/x86.c                  | 14 +++++++-------
>   include/linux/kvm_host.h            |  9 +++++++--
>   include/linux/kvm_types.h           | 12 ++++++++++++
>   virt/kvm/kvm_main.c                 | 14 +++++++-------
>   17 files changed, 82 insertions(+), 90 deletions(-)
>
> diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
> index 7cd7d5c8c4bc..f3ad7a20b0af 100644
> --- a/arch/arm64/include/asm/kvm_host.h
> +++ b/arch/arm64/include/asm/kvm_host.h
> @@ -556,16 +556,11 @@ static inline bool __vcpu_write_sys_reg_to_cpu(u64 val, int reg)
>   }
>   
>   struct kvm_vm_stat {
> -	ulong remote_tlb_flush;
> +	struct kvm_vm_stat_common common;
>   };
>   
>   struct kvm_vcpu_stat {
> -	u64 halt_successful_poll;
> -	u64 halt_attempted_poll;
> -	u64 halt_poll_success_ns;
> -	u64 halt_poll_fail_ns;
> -	u64 halt_poll_invalid;
> -	u64 halt_wakeup;
> +	struct kvm_vcpu_stat_common common;
>   	u64 hvc_exit_stat;
>   	u64 wfe_exit_stat;
>   	u64 wfi_exit_stat;
> diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
> index 5cb4a1cd5603..0e41331b0911 100644
> --- a/arch/arm64/kvm/guest.c
> +++ b/arch/arm64/kvm/guest.c
> @@ -29,18 +29,18 @@
>   #include "trace.h"
>   
>   struct kvm_stats_debugfs_item debugfs_entries[] = {
> -	VCPU_STAT("halt_successful_poll", halt_successful_poll),
> -	VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> -	VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> -	VCPU_STAT("halt_wakeup", halt_wakeup),
> +	VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> +	VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> +	VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> +	VCPU_STAT_COM("halt_wakeup", halt_wakeup),
>   	VCPU_STAT("hvc_exit_stat", hvc_exit_stat),
>   	VCPU_STAT("wfe_exit_stat", wfe_exit_stat),
>   	VCPU_STAT("wfi_exit_stat", wfi_exit_stat),
>   	VCPU_STAT("mmio_exit_user", mmio_exit_user),
>   	VCPU_STAT("mmio_exit_kernel", mmio_exit_kernel),
>   	VCPU_STAT("exits", exits),
> -	VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> -	VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> +	VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> +	VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
>   	{ NULL }
>   };
>   
> diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h
> index fca4547d580f..6f610fbcd8d1 100644
> --- a/arch/mips/include/asm/kvm_host.h
> +++ b/arch/mips/include/asm/kvm_host.h
> @@ -109,10 +109,11 @@ static inline bool kvm_is_error_hva(unsigned long addr)
>   }
>   
>   struct kvm_vm_stat {
> -	ulong remote_tlb_flush;
> +	struct kvm_vm_stat_common common;
>   };
>   
>   struct kvm_vcpu_stat {
> +	struct kvm_vcpu_stat_common common;
>   	u64 wait_exits;
>   	u64 cache_exits;
>   	u64 signal_exits;
> @@ -142,12 +143,6 @@ struct kvm_vcpu_stat {
>   #ifdef CONFIG_CPU_LOONGSON64
>   	u64 vz_cpucfg_exits;
>   #endif
> -	u64 halt_successful_poll;
> -	u64 halt_attempted_poll;
> -	u64 halt_poll_success_ns;
> -	u64 halt_poll_fail_ns;
> -	u64 halt_poll_invalid;
> -	u64 halt_wakeup;
>   };
>   
>   struct kvm_arch_memory_slot {
> diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
> index 4d4af97dcc88..f4fc60c05e9c 100644
> --- a/arch/mips/kvm/mips.c
> +++ b/arch/mips/kvm/mips.c
> @@ -68,12 +68,12 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>   #ifdef CONFIG_CPU_LOONGSON64
>   	VCPU_STAT("vz_cpucfg", vz_cpucfg_exits),
>   #endif
> -	VCPU_STAT("halt_successful_poll", halt_successful_poll),
> -	VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> -	VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> -	VCPU_STAT("halt_wakeup", halt_wakeup),
> -	VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> -	VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> +	VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> +	VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> +	VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> +	VCPU_STAT_COM("halt_wakeup", halt_wakeup),
> +	VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> +	VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
>   	{NULL}
>   };
>   
> diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
> index 1e83359f286b..473d9d0804ff 100644
> --- a/arch/powerpc/include/asm/kvm_host.h
> +++ b/arch/powerpc/include/asm/kvm_host.h
> @@ -80,12 +80,13 @@ struct kvmppc_book3s_shadow_vcpu;
>   struct kvm_nested_guest;
>   
>   struct kvm_vm_stat {
> -	ulong remote_tlb_flush;
> +	struct kvm_vm_stat_common common;
>   	ulong num_2M_pages;
>   	ulong num_1G_pages;
>   };
>   
>   struct kvm_vcpu_stat {
> +	struct kvm_vcpu_stat_common common;
>   	u64 sum_exits;
>   	u64 mmio_exits;
>   	u64 signal_exits;
> @@ -101,14 +102,8 @@ struct kvm_vcpu_stat {
>   	u64 emulated_inst_exits;
>   	u64 dec_exits;
>   	u64 ext_intr_exits;
> -	u64 halt_poll_success_ns;
> -	u64 halt_poll_fail_ns;
>   	u64 halt_wait_ns;
> -	u64 halt_successful_poll;
> -	u64 halt_attempted_poll;
>   	u64 halt_successful_wait;
> -	u64 halt_poll_invalid;
> -	u64 halt_wakeup;
>   	u64 dbell_exits;
>   	u64 gdbell_exits;
>   	u64 ld;
> diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
> index 2b691f4d1f26..bd3a10e1fdaf 100644
> --- a/arch/powerpc/kvm/book3s.c
> +++ b/arch/powerpc/kvm/book3s.c
> @@ -47,14 +47,14 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>   	VCPU_STAT("dec", dec_exits),
>   	VCPU_STAT("ext_intr", ext_intr_exits),
>   	VCPU_STAT("queue_intr", queue_intr),
> -	VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> -	VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> +	VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> +	VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
>   	VCPU_STAT("halt_wait_ns", halt_wait_ns),
> -	VCPU_STAT("halt_successful_poll", halt_successful_poll),
> -	VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> +	VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> +	VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
>   	VCPU_STAT("halt_successful_wait", halt_successful_wait),
> -	VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> -	VCPU_STAT("halt_wakeup", halt_wakeup),
> +	VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> +	VCPU_STAT_COM("halt_wakeup", halt_wakeup),
>   	VCPU_STAT("pf_storage", pf_storage),
>   	VCPU_STAT("sp_storage", sp_storage),
>   	VCPU_STAT("pf_instruc", pf_instruc),
> diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
> index 28a80d240b76..58e187e03c52 100644
> --- a/arch/powerpc/kvm/book3s_hv.c
> +++ b/arch/powerpc/kvm/book3s_hv.c
> @@ -236,7 +236,7 @@ static void kvmppc_fast_vcpu_kick_hv(struct kvm_vcpu *vcpu)
>   
>   	waitp = kvm_arch_vcpu_get_wait(vcpu);
>   	if (rcuwait_wake_up(waitp))
> -		++vcpu->stat.halt_wakeup;
> +		++vcpu->stat.common.halt_wakeup;
>   
>   	cpu = READ_ONCE(vcpu->arch.thread_cpu);
>   	if (cpu >= 0 && kvmppc_ipi_thread(cpu))
> @@ -3925,7 +3925,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
>   	cur = start_poll = ktime_get();
>   	if (vc->halt_poll_ns) {
>   		ktime_t stop = ktime_add_ns(start_poll, vc->halt_poll_ns);
> -		++vc->runner->stat.halt_attempted_poll;
> +		++vc->runner->stat.common.halt_attempted_poll;
>   
>   		vc->vcore_state = VCORE_POLLING;
>   		spin_unlock(&vc->lock);
> @@ -3942,7 +3942,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
>   		vc->vcore_state = VCORE_INACTIVE;
>   
>   		if (!do_sleep) {
> -			++vc->runner->stat.halt_successful_poll;
> +			++vc->runner->stat.common.halt_successful_poll;
>   			goto out;
>   		}
>   	}
> @@ -3954,7 +3954,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
>   		do_sleep = 0;
>   		/* If we polled, count this as a successful poll */
>   		if (vc->halt_poll_ns)
> -			++vc->runner->stat.halt_successful_poll;
> +			++vc->runner->stat.common.halt_successful_poll;
>   		goto out;
>   	}
>   
> @@ -3981,13 +3981,13 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
>   			ktime_to_ns(cur) - ktime_to_ns(start_wait);
>   		/* Attribute failed poll time */
>   		if (vc->halt_poll_ns)
> -			vc->runner->stat.halt_poll_fail_ns +> +			vc->runner->stat.common.halt_poll_fail_ns +>   				ktime_to_ns(start_wait) -
>   				ktime_to_ns(start_poll);
>   	} else {
>   		/* Attribute successful poll time */
>   		if (vc->halt_poll_ns)
> -			vc->runner->stat.halt_poll_success_ns +> +			vc->runner->stat.common.halt_poll_success_ns +>   				ktime_to_ns(cur) -
>   				ktime_to_ns(start_poll);
>   	}
> diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c
> index d7733b07f489..214caa9d9675 100644
> --- a/arch/powerpc/kvm/book3s_pr.c
> +++ b/arch/powerpc/kvm/book3s_pr.c
> @@ -493,7 +493,7 @@ static void kvmppc_set_msr_pr(struct kvm_vcpu *vcpu, u64 msr)
>   		if (!vcpu->arch.pending_exceptions) {
>   			kvm_vcpu_block(vcpu);
>   			kvm_clear_request(KVM_REQ_UNHALT, vcpu);
> -			vcpu->stat.halt_wakeup++;
> +			vcpu->stat.common.halt_wakeup++;
>   
>   			/* Unset POW bit after we woke up */
>   			msr &= ~MSR_POW;
> diff --git a/arch/powerpc/kvm/book3s_pr_papr.c b/arch/powerpc/kvm/book3s_pr_papr.c
> index 031c8015864a..9384625c8051 100644
> --- a/arch/powerpc/kvm/book3s_pr_papr.c
> +++ b/arch/powerpc/kvm/book3s_pr_papr.c
> @@ -378,7 +378,7 @@ int kvmppc_h_pr(struct kvm_vcpu *vcpu, unsigned long cmd)
>   		kvmppc_set_msr_fast(vcpu, kvmppc_get_msr(vcpu) | MSR_EE);
>   		kvm_vcpu_block(vcpu);
>   		kvm_clear_request(KVM_REQ_UNHALT, vcpu);
> -		vcpu->stat.halt_wakeup++;
> +		vcpu->stat.common.halt_wakeup++;
>   		return EMULATE_DONE;
>   	case H_LOGICAL_CI_LOAD:
>   		return kvmppc_h_pr_logical_ci_load(vcpu);
> diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
> index 7d5fe43f85c4..07fdd7a1254a 100644
> --- a/arch/powerpc/kvm/booke.c
> +++ b/arch/powerpc/kvm/booke.c
> @@ -49,15 +49,15 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>   	VCPU_STAT("inst_emu", emulated_inst_exits),
>   	VCPU_STAT("dec", dec_exits),
>   	VCPU_STAT("ext_intr", ext_intr_exits),
> -	VCPU_STAT("halt_successful_poll", halt_successful_poll),
> -	VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> -	VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> -	VCPU_STAT("halt_wakeup", halt_wakeup),
> +	VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> +	VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> +	VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> +	VCPU_STAT_COM("halt_wakeup", halt_wakeup),
>   	VCPU_STAT("doorbell", dbell_exits),
>   	VCPU_STAT("guest doorbell", gdbell_exits),
> -	VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> -	VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> -	VM_STAT("remote_tlb_flush", remote_tlb_flush),
> +	VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> +	VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
> +	VM_STAT_COM("remote_tlb_flush", remote_tlb_flush),
>   	{ NULL }
>   };
>   
> diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
> index 8925f3969478..57a20897f3db 100644
> --- a/arch/s390/include/asm/kvm_host.h
> +++ b/arch/s390/include/asm/kvm_host.h
> @@ -361,6 +361,7 @@ struct sie_page {
>   };
>   
>   struct kvm_vcpu_stat {
> +	struct kvm_vcpu_stat_common common;
>   	u64 exit_userspace;
>   	u64 exit_null;
>   	u64 exit_external_request;
> @@ -370,13 +371,7 @@ struct kvm_vcpu_stat {
>   	u64 exit_validity;
>   	u64 exit_instruction;
>   	u64 exit_pei;
> -	u64 halt_successful_poll;
> -	u64 halt_attempted_poll;
> -	u64 halt_poll_invalid;
>   	u64 halt_no_poll_steal;
> -	u64 halt_wakeup;
> -	u64 halt_poll_success_ns;
> -	u64 halt_poll_fail_ns;
>   	u64 instruction_lctl;
>   	u64 instruction_lctlg;
>   	u64 instruction_stctl;
> @@ -755,12 +750,12 @@ struct kvm_vcpu_arch {
>   };
>   
>   struct kvm_vm_stat {
> +	struct kvm_vm_stat_common common;
>   	u64 inject_io;
>   	u64 inject_float_mchk;
>   	u64 inject_pfault_done;
>   	u64 inject_service_signal;
>   	u64 inject_virtio;
> -	u64 remote_tlb_flush;
>   };
>   
>   struct kvm_arch_memory_slot {
> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> index 1296fc10f80c..d6bf3372bb10 100644
> --- a/arch/s390/kvm/kvm-s390.c
> +++ b/arch/s390/kvm/kvm-s390.c
> @@ -72,13 +72,13 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>   	VCPU_STAT("exit_program_interruption", exit_program_interruption),
>   	VCPU_STAT("exit_instr_and_program_int", exit_instr_and_program),
>   	VCPU_STAT("exit_operation_exception", exit_operation_exception),
> -	VCPU_STAT("halt_successful_poll", halt_successful_poll),
> -	VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> -	VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> +	VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> +	VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> +	VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
>   	VCPU_STAT("halt_no_poll_steal", halt_no_poll_steal),
> -	VCPU_STAT("halt_wakeup", halt_wakeup),
> -	VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> -	VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> +	VCPU_STAT_COM("halt_wakeup", halt_wakeup),
> +	VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> +	VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
>   	VCPU_STAT("instruction_lctlg", instruction_lctlg),
>   	VCPU_STAT("instruction_lctl", instruction_lctl),
>   	VCPU_STAT("instruction_stctl", instruction_stctl),
> diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
> index 55efbacfc244..5bfd6893fbf6 100644
> --- a/arch/x86/include/asm/kvm_host.h
> +++ b/arch/x86/include/asm/kvm_host.h
> @@ -1127,6 +1127,7 @@ struct kvm_arch {
>   };
>   
>   struct kvm_vm_stat {
> +	struct kvm_vm_stat_common common;
>   	ulong mmu_shadow_zapped;
>   	ulong mmu_pte_write;
>   	ulong mmu_pde_zapped;
> @@ -1134,13 +1135,13 @@ struct kvm_vm_stat {
>   	ulong mmu_recycled;
>   	ulong mmu_cache_miss;
>   	ulong mmu_unsync;
> -	ulong remote_tlb_flush;
>   	ulong lpages;
>   	ulong nx_lpage_splits;
>   	ulong max_mmu_page_hash_collisions;
>   };
>   
>   struct kvm_vcpu_stat {
> +	struct kvm_vcpu_stat_common common;
>   	u64 pf_fixed;
>   	u64 pf_guest;
>   	u64 tlb_flush;
> @@ -1154,10 +1155,6 @@ struct kvm_vcpu_stat {
>   	u64 nmi_window_exits;
>   	u64 l1d_flush;
>   	u64 halt_exits;
> -	u64 halt_successful_poll;
> -	u64 halt_attempted_poll;
> -	u64 halt_poll_invalid;
> -	u64 halt_wakeup;
>   	u64 request_irq_exits;
>   	u64 irq_exits;
>   	u64 host_state_reload;
> @@ -1168,8 +1165,6 @@ struct kvm_vcpu_stat {
>   	u64 irq_injections;
>   	u64 nmi_injections;
>   	u64 req_event;
> -	u64 halt_poll_success_ns;
> -	u64 halt_poll_fail_ns;
>   	u64 nested_run;
>   	u64 directed_yield_attempted;
>   	u64 directed_yield_successful;
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index 9b6bca616929..9a93d80caff6 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -226,10 +226,10 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>   	VCPU_STAT("irq_window", irq_window_exits),
>   	VCPU_STAT("nmi_window", nmi_window_exits),
>   	VCPU_STAT("halt_exits", halt_exits),
> -	VCPU_STAT("halt_successful_poll", halt_successful_poll),
> -	VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> -	VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> -	VCPU_STAT("halt_wakeup", halt_wakeup),
> +	VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> +	VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> +	VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> +	VCPU_STAT_COM("halt_wakeup", halt_wakeup),
>   	VCPU_STAT("hypercalls", hypercalls),
>   	VCPU_STAT("request_irq", request_irq_exits),
>   	VCPU_STAT("irq_exits", irq_exits),
> @@ -241,8 +241,8 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>   	VCPU_STAT("nmi_injections", nmi_injections),
>   	VCPU_STAT("req_event", req_event),
>   	VCPU_STAT("l1d_flush", l1d_flush),
> -	VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> -	VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> +	VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> +	VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
>   	VCPU_STAT("nested_run", nested_run),
>   	VCPU_STAT("directed_yield_attempted", directed_yield_attempted),
>   	VCPU_STAT("directed_yield_successful", directed_yield_successful),
> @@ -253,7 +253,7 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>   	VM_STAT("mmu_recycled", mmu_recycled),
>   	VM_STAT("mmu_cache_miss", mmu_cache_miss),
>   	VM_STAT("mmu_unsync", mmu_unsync),
> -	VM_STAT("remote_tlb_flush", remote_tlb_flush),
> +	VM_STAT_COM("remote_tlb_flush", remote_tlb_flush),
>   	VM_STAT("largepages", lpages, .mode = 0444),
>   	VM_STAT("nx_largepages_splitted", nx_lpage_splits, .mode = 0444),
>   	VM_STAT("max_mmu_page_hash_collisions", max_mmu_page_hash_collisions),
> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> index 2f34487e21f2..97700e41db3b 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -1243,10 +1243,15 @@ struct kvm_stats_debugfs_item {
>   #define KVM_DBGFS_GET_MODE(dbgfs_item)                                         \
>   	((dbgfs_item)->mode ? (dbgfs_item)->mode : 0644)
>   
> -#define VM_STAT(n, x, ...) 							\
> +#define VM_STAT(n, x, ...)						       \
>   	{ n, offsetof(struct kvm, stat.x), KVM_STAT_VM, ## __VA_ARGS__ }
> -#define VCPU_STAT(n, x, ...)							\
> +#define VCPU_STAT(n, x, ...)						       \
>   	{ n, offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU, ## __VA_ARGS__ }
> +#define VM_STAT_COM(n, x, ...)						       \
> +	{ n, offsetof(struct kvm, stat.common.x), KVM_STAT_VM, ## __VA_ARGS__ }
> +#define VCPU_STAT_COM(n, x, ...)					       \
> +	{ n, offsetof(struct kvm_vcpu, stat.common.x),			       \
> +	  KVM_STAT_VCPU, ## __VA_ARGS__ }
>   
>   extern struct kvm_stats_debugfs_item debugfs_entries[];
>   extern struct dentry *kvm_debugfs_dir;
> diff --git a/include/linux/kvm_types.h b/include/linux/kvm_types.h
> index a7580f69dda0..87eb05ad678b 100644
> --- a/include/linux/kvm_types.h
> +++ b/include/linux/kvm_types.h
> @@ -76,5 +76,17 @@ struct kvm_mmu_memory_cache {
>   };
>   #endif
>   
> +struct kvm_vm_stat_common {


Should this be named as 'kvm_vm_stat_generic' by following the 
convention in kvm_main.c ?  For example, kvm_vm_ioctl_enable_cap()  vs.  
kvm_vm_ioctl_enable_cap_generic().

> +	ulong remote_tlb_flush;
> +};
> +
> +struct kvm_vcpu_stat_common {


Same comment as above.

> +	u64 halt_successful_poll;
> +	u64 halt_attempted_poll;
> +	u64 halt_poll_invalid;
> +	u64 halt_wakeup;
> +	u64 halt_poll_success_ns;
> +	u64 halt_poll_fail_ns;
> +};
>   
>   #endif /* __KVM_TYPES_H__ */
> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> index 6b4feb92dc79..34a4cf265297 100644
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -330,7 +330,7 @@ void kvm_flush_remote_tlbs(struct kvm *kvm)
>   	 */
>   	if (!kvm_arch_flush_remote_tlb(kvm)
>   	    || kvm_make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
> -		++kvm->stat.remote_tlb_flush;
> +		++kvm->stat.common.remote_tlb_flush;
>   	cmpxchg(&kvm->tlbs_dirty, dirty_count, 0);
>   }
>   EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs);
> @@ -2940,9 +2940,9 @@ static inline void
>   update_halt_poll_stats(struct kvm_vcpu *vcpu, u64 poll_ns, bool waited)
>   {
>   	if (waited)
> -		vcpu->stat.halt_poll_fail_ns += poll_ns;
> +		vcpu->stat.common.halt_poll_fail_ns += poll_ns;
>   	else
> -		vcpu->stat.halt_poll_success_ns += poll_ns;
> +		vcpu->stat.common.halt_poll_success_ns += poll_ns;
>   }
>   
>   /*
> @@ -2960,16 +2960,16 @@ void kvm_vcpu_block(struct kvm_vcpu *vcpu)
>   	if (vcpu->halt_poll_ns && !kvm_arch_no_poll(vcpu)) {
>   		ktime_t stop = ktime_add_ns(ktime_get(), vcpu->halt_poll_ns);
>   
> -		++vcpu->stat.halt_attempted_poll;
> +		++vcpu->stat.common.halt_attempted_poll;
>   		do {
>   			/*
>   			 * This sets KVM_REQ_UNHALT if an interrupt
>   			 * arrives.
>   			 */
>   			if (kvm_vcpu_check_block(vcpu) < 0) {
> -				++vcpu->stat.halt_successful_poll;
> +				++vcpu->stat.common.halt_successful_poll;
>   				if (!vcpu_valid_wakeup(vcpu))
> -					++vcpu->stat.halt_poll_invalid;
> +					++vcpu->stat.common.halt_poll_invalid;
>   				goto out;
>   			}
>   			poll_end = cur = ktime_get();
> @@ -3027,7 +3027,7 @@ bool kvm_vcpu_wake_up(struct kvm_vcpu *vcpu)
>   	waitp = kvm_arch_vcpu_get_wait(vcpu);
>   	if (rcuwait_wake_up(waitp)) {
>   		WRITE_ONCE(vcpu->ready, true);
> -		++vcpu->stat.halt_wakeup;
> +		++vcpu->stat.common.halt_wakeup;
>   		return true;
>   	}
>   

Re: [PATCH v6 1/4] KVM: stats: Separate common stats from architecture specific ones

[Krish Sadhukhan]

On 5/24/21 8:18 AM, Jing Zhang wrote:
> Put all common statistics in a separate structure to ease
> statistics handling for the incoming new statistics API.
>
> No functional change intended.
>
> Reviewed-by: David Matlack <dmatlack@google.com>
> Reviewed-by: Ricardo Koller <ricarkol@google.com>
> Signed-off-by: Jing Zhang <jingzhangos@google.com>
> ---
>   arch/arm64/include/asm/kvm_host.h   |  9 ++-------
>   arch/arm64/kvm/guest.c              | 12 ++++++------
>   arch/mips/include/asm/kvm_host.h    |  9 ++-------
>   arch/mips/kvm/mips.c                | 12 ++++++------
>   arch/powerpc/include/asm/kvm_host.h |  9 ++-------
>   arch/powerpc/kvm/book3s.c           | 12 ++++++------
>   arch/powerpc/kvm/book3s_hv.c        | 12 ++++++------
>   arch/powerpc/kvm/book3s_pr.c        |  2 +-
>   arch/powerpc/kvm/book3s_pr_papr.c   |  2 +-
>   arch/powerpc/kvm/booke.c            | 14 +++++++-------
>   arch/s390/include/asm/kvm_host.h    |  9 ++-------
>   arch/s390/kvm/kvm-s390.c            | 12 ++++++------
>   arch/x86/include/asm/kvm_host.h     |  9 ++-------
>   arch/x86/kvm/x86.c                  | 14 +++++++-------
>   include/linux/kvm_host.h            |  9 +++++++--
>   include/linux/kvm_types.h           | 12 ++++++++++++
>   virt/kvm/kvm_main.c                 | 14 +++++++-------
>   17 files changed, 82 insertions(+), 90 deletions(-)
>
> diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
> index 7cd7d5c8c4bc..f3ad7a20b0af 100644
> --- a/arch/arm64/include/asm/kvm_host.h
> +++ b/arch/arm64/include/asm/kvm_host.h
> @@ -556,16 +556,11 @@ static inline bool __vcpu_write_sys_reg_to_cpu(u64 val, int reg)
>   }
>   
>   struct kvm_vm_stat {
> -	ulong remote_tlb_flush;
> +	struct kvm_vm_stat_common common;
>   };
>   
>   struct kvm_vcpu_stat {
> -	u64 halt_successful_poll;
> -	u64 halt_attempted_poll;
> -	u64 halt_poll_success_ns;
> -	u64 halt_poll_fail_ns;
> -	u64 halt_poll_invalid;
> -	u64 halt_wakeup;
> +	struct kvm_vcpu_stat_common common;
>   	u64 hvc_exit_stat;
>   	u64 wfe_exit_stat;
>   	u64 wfi_exit_stat;
> diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
> index 5cb4a1cd5603..0e41331b0911 100644
> --- a/arch/arm64/kvm/guest.c
> +++ b/arch/arm64/kvm/guest.c
> @@ -29,18 +29,18 @@
>   #include "trace.h"
>   
>   struct kvm_stats_debugfs_item debugfs_entries[] = {
> -	VCPU_STAT("halt_successful_poll", halt_successful_poll),
> -	VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> -	VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> -	VCPU_STAT("halt_wakeup", halt_wakeup),
> +	VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> +	VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> +	VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> +	VCPU_STAT_COM("halt_wakeup", halt_wakeup),
>   	VCPU_STAT("hvc_exit_stat", hvc_exit_stat),
>   	VCPU_STAT("wfe_exit_stat", wfe_exit_stat),
>   	VCPU_STAT("wfi_exit_stat", wfi_exit_stat),
>   	VCPU_STAT("mmio_exit_user", mmio_exit_user),
>   	VCPU_STAT("mmio_exit_kernel", mmio_exit_kernel),
>   	VCPU_STAT("exits", exits),
> -	VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> -	VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> +	VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> +	VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
>   	{ NULL }
>   };
>   
> diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h
> index fca4547d580f..6f610fbcd8d1 100644
> --- a/arch/mips/include/asm/kvm_host.h
> +++ b/arch/mips/include/asm/kvm_host.h
> @@ -109,10 +109,11 @@ static inline bool kvm_is_error_hva(unsigned long addr)
>   }
>   
>   struct kvm_vm_stat {
> -	ulong remote_tlb_flush;
> +	struct kvm_vm_stat_common common;
>   };
>   
>   struct kvm_vcpu_stat {
> +	struct kvm_vcpu_stat_common common;
>   	u64 wait_exits;
>   	u64 cache_exits;
>   	u64 signal_exits;
> @@ -142,12 +143,6 @@ struct kvm_vcpu_stat {
>   #ifdef CONFIG_CPU_LOONGSON64
>   	u64 vz_cpucfg_exits;
>   #endif
> -	u64 halt_successful_poll;
> -	u64 halt_attempted_poll;
> -	u64 halt_poll_success_ns;
> -	u64 halt_poll_fail_ns;
> -	u64 halt_poll_invalid;
> -	u64 halt_wakeup;
>   };
>   
>   struct kvm_arch_memory_slot {
> diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
> index 4d4af97dcc88..f4fc60c05e9c 100644
> --- a/arch/mips/kvm/mips.c
> +++ b/arch/mips/kvm/mips.c
> @@ -68,12 +68,12 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>   #ifdef CONFIG_CPU_LOONGSON64
>   	VCPU_STAT("vz_cpucfg", vz_cpucfg_exits),
>   #endif
> -	VCPU_STAT("halt_successful_poll", halt_successful_poll),
> -	VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> -	VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> -	VCPU_STAT("halt_wakeup", halt_wakeup),
> -	VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> -	VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> +	VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> +	VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> +	VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> +	VCPU_STAT_COM("halt_wakeup", halt_wakeup),
> +	VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> +	VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
>   	{NULL}
>   };
>   
> diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
> index 1e83359f286b..473d9d0804ff 100644
> --- a/arch/powerpc/include/asm/kvm_host.h
> +++ b/arch/powerpc/include/asm/kvm_host.h
> @@ -80,12 +80,13 @@ struct kvmppc_book3s_shadow_vcpu;
>   struct kvm_nested_guest;
>   
>   struct kvm_vm_stat {
> -	ulong remote_tlb_flush;
> +	struct kvm_vm_stat_common common;
>   	ulong num_2M_pages;
>   	ulong num_1G_pages;
>   };
>   
>   struct kvm_vcpu_stat {
> +	struct kvm_vcpu_stat_common common;
>   	u64 sum_exits;
>   	u64 mmio_exits;
>   	u64 signal_exits;
> @@ -101,14 +102,8 @@ struct kvm_vcpu_stat {
>   	u64 emulated_inst_exits;
>   	u64 dec_exits;
>   	u64 ext_intr_exits;
> -	u64 halt_poll_success_ns;
> -	u64 halt_poll_fail_ns;
>   	u64 halt_wait_ns;
> -	u64 halt_successful_poll;
> -	u64 halt_attempted_poll;
>   	u64 halt_successful_wait;
> -	u64 halt_poll_invalid;
> -	u64 halt_wakeup;
>   	u64 dbell_exits;
>   	u64 gdbell_exits;
>   	u64 ld;
> diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
> index 2b691f4d1f26..bd3a10e1fdaf 100644
> --- a/arch/powerpc/kvm/book3s.c
> +++ b/arch/powerpc/kvm/book3s.c
> @@ -47,14 +47,14 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>   	VCPU_STAT("dec", dec_exits),
>   	VCPU_STAT("ext_intr", ext_intr_exits),
>   	VCPU_STAT("queue_intr", queue_intr),
> -	VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> -	VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> +	VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> +	VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
>   	VCPU_STAT("halt_wait_ns", halt_wait_ns),
> -	VCPU_STAT("halt_successful_poll", halt_successful_poll),
> -	VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> +	VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> +	VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
>   	VCPU_STAT("halt_successful_wait", halt_successful_wait),
> -	VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> -	VCPU_STAT("halt_wakeup", halt_wakeup),
> +	VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> +	VCPU_STAT_COM("halt_wakeup", halt_wakeup),
>   	VCPU_STAT("pf_storage", pf_storage),
>   	VCPU_STAT("sp_storage", sp_storage),
>   	VCPU_STAT("pf_instruc", pf_instruc),
> diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
> index 28a80d240b76..58e187e03c52 100644
> --- a/arch/powerpc/kvm/book3s_hv.c
> +++ b/arch/powerpc/kvm/book3s_hv.c
> @@ -236,7 +236,7 @@ static void kvmppc_fast_vcpu_kick_hv(struct kvm_vcpu *vcpu)
>   
>   	waitp = kvm_arch_vcpu_get_wait(vcpu);
>   	if (rcuwait_wake_up(waitp))
> -		++vcpu->stat.halt_wakeup;
> +		++vcpu->stat.common.halt_wakeup;
>   
>   	cpu = READ_ONCE(vcpu->arch.thread_cpu);
>   	if (cpu >= 0 && kvmppc_ipi_thread(cpu))
> @@ -3925,7 +3925,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
>   	cur = start_poll = ktime_get();
>   	if (vc->halt_poll_ns) {
>   		ktime_t stop = ktime_add_ns(start_poll, vc->halt_poll_ns);
> -		++vc->runner->stat.halt_attempted_poll;
> +		++vc->runner->stat.common.halt_attempted_poll;
>   
>   		vc->vcore_state = VCORE_POLLING;
>   		spin_unlock(&vc->lock);
> @@ -3942,7 +3942,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
>   		vc->vcore_state = VCORE_INACTIVE;
>   
>   		if (!do_sleep) {
> -			++vc->runner->stat.halt_successful_poll;
> +			++vc->runner->stat.common.halt_successful_poll;
>   			goto out;
>   		}
>   	}
> @@ -3954,7 +3954,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
>   		do_sleep = 0;
>   		/* If we polled, count this as a successful poll */
>   		if (vc->halt_poll_ns)
> -			++vc->runner->stat.halt_successful_poll;
> +			++vc->runner->stat.common.halt_successful_poll;
>   		goto out;
>   	}
>   
> @@ -3981,13 +3981,13 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
>   			ktime_to_ns(cur) - ktime_to_ns(start_wait);
>   		/* Attribute failed poll time */
>   		if (vc->halt_poll_ns)
> -			vc->runner->stat.halt_poll_fail_ns +=
> +			vc->runner->stat.common.halt_poll_fail_ns +=
>   				ktime_to_ns(start_wait) -
>   				ktime_to_ns(start_poll);
>   	} else {
>   		/* Attribute successful poll time */
>   		if (vc->halt_poll_ns)
> -			vc->runner->stat.halt_poll_success_ns +=
> +			vc->runner->stat.common.halt_poll_success_ns +=
>   				ktime_to_ns(cur) -
>   				ktime_to_ns(start_poll);
>   	}
> diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c
> index d7733b07f489..214caa9d9675 100644
> --- a/arch/powerpc/kvm/book3s_pr.c
> +++ b/arch/powerpc/kvm/book3s_pr.c
> @@ -493,7 +493,7 @@ static void kvmppc_set_msr_pr(struct kvm_vcpu *vcpu, u64 msr)
>   		if (!vcpu->arch.pending_exceptions) {
>   			kvm_vcpu_block(vcpu);
>   			kvm_clear_request(KVM_REQ_UNHALT, vcpu);
> -			vcpu->stat.halt_wakeup++;
> +			vcpu->stat.common.halt_wakeup++;
>   
>   			/* Unset POW bit after we woke up */
>   			msr &= ~MSR_POW;
> diff --git a/arch/powerpc/kvm/book3s_pr_papr.c b/arch/powerpc/kvm/book3s_pr_papr.c
> index 031c8015864a..9384625c8051 100644
> --- a/arch/powerpc/kvm/book3s_pr_papr.c
> +++ b/arch/powerpc/kvm/book3s_pr_papr.c
> @@ -378,7 +378,7 @@ int kvmppc_h_pr(struct kvm_vcpu *vcpu, unsigned long cmd)
>   		kvmppc_set_msr_fast(vcpu, kvmppc_get_msr(vcpu) | MSR_EE);
>   		kvm_vcpu_block(vcpu);
>   		kvm_clear_request(KVM_REQ_UNHALT, vcpu);
> -		vcpu->stat.halt_wakeup++;
> +		vcpu->stat.common.halt_wakeup++;
>   		return EMULATE_DONE;
>   	case H_LOGICAL_CI_LOAD:
>   		return kvmppc_h_pr_logical_ci_load(vcpu);
> diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
> index 7d5fe43f85c4..07fdd7a1254a 100644
> --- a/arch/powerpc/kvm/booke.c
> +++ b/arch/powerpc/kvm/booke.c
> @@ -49,15 +49,15 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>   	VCPU_STAT("inst_emu", emulated_inst_exits),
>   	VCPU_STAT("dec", dec_exits),
>   	VCPU_STAT("ext_intr", ext_intr_exits),
> -	VCPU_STAT("halt_successful_poll", halt_successful_poll),
> -	VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> -	VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> -	VCPU_STAT("halt_wakeup", halt_wakeup),
> +	VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> +	VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> +	VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> +	VCPU_STAT_COM("halt_wakeup", halt_wakeup),
>   	VCPU_STAT("doorbell", dbell_exits),
>   	VCPU_STAT("guest doorbell", gdbell_exits),
> -	VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> -	VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> -	VM_STAT("remote_tlb_flush", remote_tlb_flush),
> +	VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> +	VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
> +	VM_STAT_COM("remote_tlb_flush", remote_tlb_flush),
>   	{ NULL }
>   };
>   
> diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
> index 8925f3969478..57a20897f3db 100644
> --- a/arch/s390/include/asm/kvm_host.h
> +++ b/arch/s390/include/asm/kvm_host.h
> @@ -361,6 +361,7 @@ struct sie_page {
>   };
>   
>   struct kvm_vcpu_stat {
> +	struct kvm_vcpu_stat_common common;
>   	u64 exit_userspace;
>   	u64 exit_null;
>   	u64 exit_external_request;
> @@ -370,13 +371,7 @@ struct kvm_vcpu_stat {
>   	u64 exit_validity;
>   	u64 exit_instruction;
>   	u64 exit_pei;
> -	u64 halt_successful_poll;
> -	u64 halt_attempted_poll;
> -	u64 halt_poll_invalid;
>   	u64 halt_no_poll_steal;
> -	u64 halt_wakeup;
> -	u64 halt_poll_success_ns;
> -	u64 halt_poll_fail_ns;
>   	u64 instruction_lctl;
>   	u64 instruction_lctlg;
>   	u64 instruction_stctl;
> @@ -755,12 +750,12 @@ struct kvm_vcpu_arch {
>   };
>   
>   struct kvm_vm_stat {
> +	struct kvm_vm_stat_common common;
>   	u64 inject_io;
>   	u64 inject_float_mchk;
>   	u64 inject_pfault_done;
>   	u64 inject_service_signal;
>   	u64 inject_virtio;
> -	u64 remote_tlb_flush;
>   };
>   
>   struct kvm_arch_memory_slot {
> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> index 1296fc10f80c..d6bf3372bb10 100644
> --- a/arch/s390/kvm/kvm-s390.c
> +++ b/arch/s390/kvm/kvm-s390.c
> @@ -72,13 +72,13 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>   	VCPU_STAT("exit_program_interruption", exit_program_interruption),
>   	VCPU_STAT("exit_instr_and_program_int", exit_instr_and_program),
>   	VCPU_STAT("exit_operation_exception", exit_operation_exception),
> -	VCPU_STAT("halt_successful_poll", halt_successful_poll),
> -	VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> -	VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> +	VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> +	VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> +	VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
>   	VCPU_STAT("halt_no_poll_steal", halt_no_poll_steal),
> -	VCPU_STAT("halt_wakeup", halt_wakeup),
> -	VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> -	VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> +	VCPU_STAT_COM("halt_wakeup", halt_wakeup),
> +	VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> +	VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
>   	VCPU_STAT("instruction_lctlg", instruction_lctlg),
>   	VCPU_STAT("instruction_lctl", instruction_lctl),
>   	VCPU_STAT("instruction_stctl", instruction_stctl),
> diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
> index 55efbacfc244..5bfd6893fbf6 100644
> --- a/arch/x86/include/asm/kvm_host.h
> +++ b/arch/x86/include/asm/kvm_host.h
> @@ -1127,6 +1127,7 @@ struct kvm_arch {
>   };
>   
>   struct kvm_vm_stat {
> +	struct kvm_vm_stat_common common;
>   	ulong mmu_shadow_zapped;
>   	ulong mmu_pte_write;
>   	ulong mmu_pde_zapped;
> @@ -1134,13 +1135,13 @@ struct kvm_vm_stat {
>   	ulong mmu_recycled;
>   	ulong mmu_cache_miss;
>   	ulong mmu_unsync;
> -	ulong remote_tlb_flush;
>   	ulong lpages;
>   	ulong nx_lpage_splits;
>   	ulong max_mmu_page_hash_collisions;
>   };
>   
>   struct kvm_vcpu_stat {
> +	struct kvm_vcpu_stat_common common;
>   	u64 pf_fixed;
>   	u64 pf_guest;
>   	u64 tlb_flush;
> @@ -1154,10 +1155,6 @@ struct kvm_vcpu_stat {
>   	u64 nmi_window_exits;
>   	u64 l1d_flush;
>   	u64 halt_exits;
> -	u64 halt_successful_poll;
> -	u64 halt_attempted_poll;
> -	u64 halt_poll_invalid;
> -	u64 halt_wakeup;
>   	u64 request_irq_exits;
>   	u64 irq_exits;
>   	u64 host_state_reload;
> @@ -1168,8 +1165,6 @@ struct kvm_vcpu_stat {
>   	u64 irq_injections;
>   	u64 nmi_injections;
>   	u64 req_event;
> -	u64 halt_poll_success_ns;
> -	u64 halt_poll_fail_ns;
>   	u64 nested_run;
>   	u64 directed_yield_attempted;
>   	u64 directed_yield_successful;
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index 9b6bca616929..9a93d80caff6 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -226,10 +226,10 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>   	VCPU_STAT("irq_window", irq_window_exits),
>   	VCPU_STAT("nmi_window", nmi_window_exits),
>   	VCPU_STAT("halt_exits", halt_exits),
> -	VCPU_STAT("halt_successful_poll", halt_successful_poll),
> -	VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> -	VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> -	VCPU_STAT("halt_wakeup", halt_wakeup),
> +	VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> +	VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> +	VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> +	VCPU_STAT_COM("halt_wakeup", halt_wakeup),
>   	VCPU_STAT("hypercalls", hypercalls),
>   	VCPU_STAT("request_irq", request_irq_exits),
>   	VCPU_STAT("irq_exits", irq_exits),
> @@ -241,8 +241,8 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>   	VCPU_STAT("nmi_injections", nmi_injections),
>   	VCPU_STAT("req_event", req_event),
>   	VCPU_STAT("l1d_flush", l1d_flush),
> -	VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> -	VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> +	VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> +	VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
>   	VCPU_STAT("nested_run", nested_run),
>   	VCPU_STAT("directed_yield_attempted", directed_yield_attempted),
>   	VCPU_STAT("directed_yield_successful", directed_yield_successful),
> @@ -253,7 +253,7 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>   	VM_STAT("mmu_recycled", mmu_recycled),
>   	VM_STAT("mmu_cache_miss", mmu_cache_miss),
>   	VM_STAT("mmu_unsync", mmu_unsync),
> -	VM_STAT("remote_tlb_flush", remote_tlb_flush),
> +	VM_STAT_COM("remote_tlb_flush", remote_tlb_flush),
>   	VM_STAT("largepages", lpages, .mode = 0444),
>   	VM_STAT("nx_largepages_splitted", nx_lpage_splits, .mode = 0444),
>   	VM_STAT("max_mmu_page_hash_collisions", max_mmu_page_hash_collisions),
> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> index 2f34487e21f2..97700e41db3b 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -1243,10 +1243,15 @@ struct kvm_stats_debugfs_item {
>   #define KVM_DBGFS_GET_MODE(dbgfs_item)                                         \
>   	((dbgfs_item)->mode ? (dbgfs_item)->mode : 0644)
>   
> -#define VM_STAT(n, x, ...) 							\
> +#define VM_STAT(n, x, ...)						       \
>   	{ n, offsetof(struct kvm, stat.x), KVM_STAT_VM, ## __VA_ARGS__ }
> -#define VCPU_STAT(n, x, ...)							\
> +#define VCPU_STAT(n, x, ...)						       \
>   	{ n, offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU, ## __VA_ARGS__ }
> +#define VM_STAT_COM(n, x, ...)						       \
> +	{ n, offsetof(struct kvm, stat.common.x), KVM_STAT_VM, ## __VA_ARGS__ }
> +#define VCPU_STAT_COM(n, x, ...)					       \
> +	{ n, offsetof(struct kvm_vcpu, stat.common.x),			       \
> +	  KVM_STAT_VCPU, ## __VA_ARGS__ }
>   
>   extern struct kvm_stats_debugfs_item debugfs_entries[];
>   extern struct dentry *kvm_debugfs_dir;
> diff --git a/include/linux/kvm_types.h b/include/linux/kvm_types.h
> index a7580f69dda0..87eb05ad678b 100644
> --- a/include/linux/kvm_types.h
> +++ b/include/linux/kvm_types.h
> @@ -76,5 +76,17 @@ struct kvm_mmu_memory_cache {
>   };
>   #endif
>   
> +struct kvm_vm_stat_common {


Should this be named as 'kvm_vm_stat_generic' by following the 
convention in kvm_main.c ?  For example, kvm_vm_ioctl_enable_cap()  vs.  
kvm_vm_ioctl_enable_cap_generic().

> +	ulong remote_tlb_flush;
> +};
> +
> +struct kvm_vcpu_stat_common {


Same comment as above.

> +	u64 halt_successful_poll;
> +	u64 halt_attempted_poll;
> +	u64 halt_poll_invalid;
> +	u64 halt_wakeup;
> +	u64 halt_poll_success_ns;
> +	u64 halt_poll_fail_ns;
> +};
>   
>   #endif /* __KVM_TYPES_H__ */
> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> index 6b4feb92dc79..34a4cf265297 100644
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -330,7 +330,7 @@ void kvm_flush_remote_tlbs(struct kvm *kvm)
>   	 */
>   	if (!kvm_arch_flush_remote_tlb(kvm)
>   	    || kvm_make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
> -		++kvm->stat.remote_tlb_flush;
> +		++kvm->stat.common.remote_tlb_flush;
>   	cmpxchg(&kvm->tlbs_dirty, dirty_count, 0);
>   }
>   EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs);
> @@ -2940,9 +2940,9 @@ static inline void
>   update_halt_poll_stats(struct kvm_vcpu *vcpu, u64 poll_ns, bool waited)
>   {
>   	if (waited)
> -		vcpu->stat.halt_poll_fail_ns += poll_ns;
> +		vcpu->stat.common.halt_poll_fail_ns += poll_ns;
>   	else
> -		vcpu->stat.halt_poll_success_ns += poll_ns;
> +		vcpu->stat.common.halt_poll_success_ns += poll_ns;
>   }
>   
>   /*
> @@ -2960,16 +2960,16 @@ void kvm_vcpu_block(struct kvm_vcpu *vcpu)
>   	if (vcpu->halt_poll_ns && !kvm_arch_no_poll(vcpu)) {
>   		ktime_t stop = ktime_add_ns(ktime_get(), vcpu->halt_poll_ns);
>   
> -		++vcpu->stat.halt_attempted_poll;
> +		++vcpu->stat.common.halt_attempted_poll;
>   		do {
>   			/*
>   			 * This sets KVM_REQ_UNHALT if an interrupt
>   			 * arrives.
>   			 */
>   			if (kvm_vcpu_check_block(vcpu) < 0) {
> -				++vcpu->stat.halt_successful_poll;
> +				++vcpu->stat.common.halt_successful_poll;
>   				if (!vcpu_valid_wakeup(vcpu))
> -					++vcpu->stat.halt_poll_invalid;
> +					++vcpu->stat.common.halt_poll_invalid;
>   				goto out;
>   			}
>   			poll_end = cur = ktime_get();
> @@ -3027,7 +3027,7 @@ bool kvm_vcpu_wake_up(struct kvm_vcpu *vcpu)
>   	waitp = kvm_arch_vcpu_get_wait(vcpu);
>   	if (rcuwait_wake_up(waitp)) {
>   		WRITE_ONCE(vcpu->ready, true);
> -		++vcpu->stat.halt_wakeup;
> +		++vcpu->stat.common.halt_wakeup;
>   		return true;
>   	}
>   
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Re: [PATCH v6 1/4] KVM: stats: Separate common stats from architecture specific ones

[Jing Zhang]

Hi Krish,

On Tue, May 25, 2021 at 2:49 PM Krish Sadhukhan
<krish.sadhukhan@oracle.com> wrote:
>
>
> On 5/24/21 8:18 AM, Jing Zhang wrote:
> > Put all common statistics in a separate structure to ease
> > statistics handling for the incoming new statistics API.
> >
> > No functional change intended.
> >
> > Reviewed-by: David Matlack <dmatlack@google.com>
> > Reviewed-by: Ricardo Koller <ricarkol@google.com>
> > Signed-off-by: Jing Zhang <jingzhangos@google.com>
> > ---
> >   arch/arm64/include/asm/kvm_host.h   |  9 ++-------
> >   arch/arm64/kvm/guest.c              | 12 ++++++------
> >   arch/mips/include/asm/kvm_host.h    |  9 ++-------
> >   arch/mips/kvm/mips.c                | 12 ++++++------
> >   arch/powerpc/include/asm/kvm_host.h |  9 ++-------
> >   arch/powerpc/kvm/book3s.c           | 12 ++++++------
> >   arch/powerpc/kvm/book3s_hv.c        | 12 ++++++------
> >   arch/powerpc/kvm/book3s_pr.c        |  2 +-
> >   arch/powerpc/kvm/book3s_pr_papr.c   |  2 +-
> >   arch/powerpc/kvm/booke.c            | 14 +++++++-------
> >   arch/s390/include/asm/kvm_host.h    |  9 ++-------
> >   arch/s390/kvm/kvm-s390.c            | 12 ++++++------
> >   arch/x86/include/asm/kvm_host.h     |  9 ++-------
> >   arch/x86/kvm/x86.c                  | 14 +++++++-------
> >   include/linux/kvm_host.h            |  9 +++++++--
> >   include/linux/kvm_types.h           | 12 ++++++++++++
> >   virt/kvm/kvm_main.c                 | 14 +++++++-------
> >   17 files changed, 82 insertions(+), 90 deletions(-)
> >
> > diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
> > index 7cd7d5c8c4bc..f3ad7a20b0af 100644
> > --- a/arch/arm64/include/asm/kvm_host.h
> > +++ b/arch/arm64/include/asm/kvm_host.h
> > @@ -556,16 +556,11 @@ static inline bool __vcpu_write_sys_reg_to_cpu(u64 val, int reg)
> >   }
> >
> >   struct kvm_vm_stat {
> > -     ulong remote_tlb_flush;
> > +     struct kvm_vm_stat_common common;
> >   };
> >
> >   struct kvm_vcpu_stat {
> > -     u64 halt_successful_poll;
> > -     u64 halt_attempted_poll;
> > -     u64 halt_poll_success_ns;
> > -     u64 halt_poll_fail_ns;
> > -     u64 halt_poll_invalid;
> > -     u64 halt_wakeup;
> > +     struct kvm_vcpu_stat_common common;
> >       u64 hvc_exit_stat;
> >       u64 wfe_exit_stat;
> >       u64 wfi_exit_stat;
> > diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
> > index 5cb4a1cd5603..0e41331b0911 100644
> > --- a/arch/arm64/kvm/guest.c
> > +++ b/arch/arm64/kvm/guest.c
> > @@ -29,18 +29,18 @@
> >   #include "trace.h"
> >
> >   struct kvm_stats_debugfs_item debugfs_entries[] = {
> > -     VCPU_STAT("halt_successful_poll", halt_successful_poll),
> > -     VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> > -     VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> > -     VCPU_STAT("halt_wakeup", halt_wakeup),
> > +     VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> > +     VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> > +     VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> > +     VCPU_STAT_COM("halt_wakeup", halt_wakeup),
> >       VCPU_STAT("hvc_exit_stat", hvc_exit_stat),
> >       VCPU_STAT("wfe_exit_stat", wfe_exit_stat),
> >       VCPU_STAT("wfi_exit_stat", wfi_exit_stat),
> >       VCPU_STAT("mmio_exit_user", mmio_exit_user),
> >       VCPU_STAT("mmio_exit_kernel", mmio_exit_kernel),
> >       VCPU_STAT("exits", exits),
> > -     VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> > -     VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> > +     VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> > +     VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
> >       { NULL }
> >   };
> >
> > diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h
> > index fca4547d580f..6f610fbcd8d1 100644
> > --- a/arch/mips/include/asm/kvm_host.h
> > +++ b/arch/mips/include/asm/kvm_host.h
> > @@ -109,10 +109,11 @@ static inline bool kvm_is_error_hva(unsigned long addr)
> >   }
> >
> >   struct kvm_vm_stat {
> > -     ulong remote_tlb_flush;
> > +     struct kvm_vm_stat_common common;
> >   };
> >
> >   struct kvm_vcpu_stat {
> > +     struct kvm_vcpu_stat_common common;
> >       u64 wait_exits;
> >       u64 cache_exits;
> >       u64 signal_exits;
> > @@ -142,12 +143,6 @@ struct kvm_vcpu_stat {
> >   #ifdef CONFIG_CPU_LOONGSON64
> >       u64 vz_cpucfg_exits;
> >   #endif
> > -     u64 halt_successful_poll;
> > -     u64 halt_attempted_poll;
> > -     u64 halt_poll_success_ns;
> > -     u64 halt_poll_fail_ns;
> > -     u64 halt_poll_invalid;
> > -     u64 halt_wakeup;
> >   };
> >
> >   struct kvm_arch_memory_slot {
> > diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
> > index 4d4af97dcc88..f4fc60c05e9c 100644
> > --- a/arch/mips/kvm/mips.c
> > +++ b/arch/mips/kvm/mips.c
> > @@ -68,12 +68,12 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
> >   #ifdef CONFIG_CPU_LOONGSON64
> >       VCPU_STAT("vz_cpucfg", vz_cpucfg_exits),
> >   #endif
> > -     VCPU_STAT("halt_successful_poll", halt_successful_poll),
> > -     VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> > -     VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> > -     VCPU_STAT("halt_wakeup", halt_wakeup),
> > -     VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> > -     VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> > +     VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> > +     VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> > +     VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> > +     VCPU_STAT_COM("halt_wakeup", halt_wakeup),
> > +     VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> > +     VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
> >       {NULL}
> >   };
> >
> > diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
> > index 1e83359f286b..473d9d0804ff 100644
> > --- a/arch/powerpc/include/asm/kvm_host.h
> > +++ b/arch/powerpc/include/asm/kvm_host.h
> > @@ -80,12 +80,13 @@ struct kvmppc_book3s_shadow_vcpu;
> >   struct kvm_nested_guest;
> >
> >   struct kvm_vm_stat {
> > -     ulong remote_tlb_flush;
> > +     struct kvm_vm_stat_common common;
> >       ulong num_2M_pages;
> >       ulong num_1G_pages;
> >   };
> >
> >   struct kvm_vcpu_stat {
> > +     struct kvm_vcpu_stat_common common;
> >       u64 sum_exits;
> >       u64 mmio_exits;
> >       u64 signal_exits;
> > @@ -101,14 +102,8 @@ struct kvm_vcpu_stat {
> >       u64 emulated_inst_exits;
> >       u64 dec_exits;
> >       u64 ext_intr_exits;
> > -     u64 halt_poll_success_ns;
> > -     u64 halt_poll_fail_ns;
> >       u64 halt_wait_ns;
> > -     u64 halt_successful_poll;
> > -     u64 halt_attempted_poll;
> >       u64 halt_successful_wait;
> > -     u64 halt_poll_invalid;
> > -     u64 halt_wakeup;
> >       u64 dbell_exits;
> >       u64 gdbell_exits;
> >       u64 ld;
> > diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
> > index 2b691f4d1f26..bd3a10e1fdaf 100644
> > --- a/arch/powerpc/kvm/book3s.c
> > +++ b/arch/powerpc/kvm/book3s.c
> > @@ -47,14 +47,14 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
> >       VCPU_STAT("dec", dec_exits),
> >       VCPU_STAT("ext_intr", ext_intr_exits),
> >       VCPU_STAT("queue_intr", queue_intr),
> > -     VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> > -     VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> > +     VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> > +     VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
> >       VCPU_STAT("halt_wait_ns", halt_wait_ns),
> > -     VCPU_STAT("halt_successful_poll", halt_successful_poll),
> > -     VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> > +     VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> > +     VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> >       VCPU_STAT("halt_successful_wait", halt_successful_wait),
> > -     VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> > -     VCPU_STAT("halt_wakeup", halt_wakeup),
> > +     VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> > +     VCPU_STAT_COM("halt_wakeup", halt_wakeup),
> >       VCPU_STAT("pf_storage", pf_storage),
> >       VCPU_STAT("sp_storage", sp_storage),
> >       VCPU_STAT("pf_instruc", pf_instruc),
> > diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
> > index 28a80d240b76..58e187e03c52 100644
> > --- a/arch/powerpc/kvm/book3s_hv.c
> > +++ b/arch/powerpc/kvm/book3s_hv.c
> > @@ -236,7 +236,7 @@ static void kvmppc_fast_vcpu_kick_hv(struct kvm_vcpu *vcpu)
> >
> >       waitp = kvm_arch_vcpu_get_wait(vcpu);
> >       if (rcuwait_wake_up(waitp))
> > -             ++vcpu->stat.halt_wakeup;
> > +             ++vcpu->stat.common.halt_wakeup;
> >
> >       cpu = READ_ONCE(vcpu->arch.thread_cpu);
> >       if (cpu >= 0 && kvmppc_ipi_thread(cpu))
> > @@ -3925,7 +3925,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
> >       cur = start_poll = ktime_get();
> >       if (vc->halt_poll_ns) {
> >               ktime_t stop = ktime_add_ns(start_poll, vc->halt_poll_ns);
> > -             ++vc->runner->stat.halt_attempted_poll;
> > +             ++vc->runner->stat.common.halt_attempted_poll;
> >
> >               vc->vcore_state = VCORE_POLLING;
> >               spin_unlock(&vc->lock);
> > @@ -3942,7 +3942,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
> >               vc->vcore_state = VCORE_INACTIVE;
> >
> >               if (!do_sleep) {
> > -                     ++vc->runner->stat.halt_successful_poll;
> > +                     ++vc->runner->stat.common.halt_successful_poll;
> >                       goto out;
> >               }
> >       }
> > @@ -3954,7 +3954,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
> >               do_sleep = 0;
> >               /* If we polled, count this as a successful poll */
> >               if (vc->halt_poll_ns)
> > -                     ++vc->runner->stat.halt_successful_poll;
> > +                     ++vc->runner->stat.common.halt_successful_poll;
> >               goto out;
> >       }
> >
> > @@ -3981,13 +3981,13 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
> >                       ktime_to_ns(cur) - ktime_to_ns(start_wait);
> >               /* Attribute failed poll time */
> >               if (vc->halt_poll_ns)
> > -                     vc->runner->stat.halt_poll_fail_ns +=
> > +                     vc->runner->stat.common.halt_poll_fail_ns +=
> >                               ktime_to_ns(start_wait) -
> >                               ktime_to_ns(start_poll);
> >       } else {
> >               /* Attribute successful poll time */
> >               if (vc->halt_poll_ns)
> > -                     vc->runner->stat.halt_poll_success_ns +=
> > +                     vc->runner->stat.common.halt_poll_success_ns +=
> >                               ktime_to_ns(cur) -
> >                               ktime_to_ns(start_poll);
> >       }
> > diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c
> > index d7733b07f489..214caa9d9675 100644
> > --- a/arch/powerpc/kvm/book3s_pr.c
> > +++ b/arch/powerpc/kvm/book3s_pr.c
> > @@ -493,7 +493,7 @@ static void kvmppc_set_msr_pr(struct kvm_vcpu *vcpu, u64 msr)
> >               if (!vcpu->arch.pending_exceptions) {
> >                       kvm_vcpu_block(vcpu);
> >                       kvm_clear_request(KVM_REQ_UNHALT, vcpu);
> > -                     vcpu->stat.halt_wakeup++;
> > +                     vcpu->stat.common.halt_wakeup++;
> >
> >                       /* Unset POW bit after we woke up */
> >                       msr &= ~MSR_POW;
> > diff --git a/arch/powerpc/kvm/book3s_pr_papr.c b/arch/powerpc/kvm/book3s_pr_papr.c
> > index 031c8015864a..9384625c8051 100644
> > --- a/arch/powerpc/kvm/book3s_pr_papr.c
> > +++ b/arch/powerpc/kvm/book3s_pr_papr.c
> > @@ -378,7 +378,7 @@ int kvmppc_h_pr(struct kvm_vcpu *vcpu, unsigned long cmd)
> >               kvmppc_set_msr_fast(vcpu, kvmppc_get_msr(vcpu) | MSR_EE);
> >               kvm_vcpu_block(vcpu);
> >               kvm_clear_request(KVM_REQ_UNHALT, vcpu);
> > -             vcpu->stat.halt_wakeup++;
> > +             vcpu->stat.common.halt_wakeup++;
> >               return EMULATE_DONE;
> >       case H_LOGICAL_CI_LOAD:
> >               return kvmppc_h_pr_logical_ci_load(vcpu);
> > diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
> > index 7d5fe43f85c4..07fdd7a1254a 100644
> > --- a/arch/powerpc/kvm/booke.c
> > +++ b/arch/powerpc/kvm/booke.c
> > @@ -49,15 +49,15 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
> >       VCPU_STAT("inst_emu", emulated_inst_exits),
> >       VCPU_STAT("dec", dec_exits),
> >       VCPU_STAT("ext_intr", ext_intr_exits),
> > -     VCPU_STAT("halt_successful_poll", halt_successful_poll),
> > -     VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> > -     VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> > -     VCPU_STAT("halt_wakeup", halt_wakeup),
> > +     VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> > +     VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> > +     VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> > +     VCPU_STAT_COM("halt_wakeup", halt_wakeup),
> >       VCPU_STAT("doorbell", dbell_exits),
> >       VCPU_STAT("guest doorbell", gdbell_exits),
> > -     VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> > -     VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> > -     VM_STAT("remote_tlb_flush", remote_tlb_flush),
> > +     VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> > +     VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
> > +     VM_STAT_COM("remote_tlb_flush", remote_tlb_flush),
> >       { NULL }
> >   };
> >
> > diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
> > index 8925f3969478..57a20897f3db 100644
> > --- a/arch/s390/include/asm/kvm_host.h
> > +++ b/arch/s390/include/asm/kvm_host.h
> > @@ -361,6 +361,7 @@ struct sie_page {
> >   };
> >
> >   struct kvm_vcpu_stat {
> > +     struct kvm_vcpu_stat_common common;
> >       u64 exit_userspace;
> >       u64 exit_null;
> >       u64 exit_external_request;
> > @@ -370,13 +371,7 @@ struct kvm_vcpu_stat {
> >       u64 exit_validity;
> >       u64 exit_instruction;
> >       u64 exit_pei;
> > -     u64 halt_successful_poll;
> > -     u64 halt_attempted_poll;
> > -     u64 halt_poll_invalid;
> >       u64 halt_no_poll_steal;
> > -     u64 halt_wakeup;
> > -     u64 halt_poll_success_ns;
> > -     u64 halt_poll_fail_ns;
> >       u64 instruction_lctl;
> >       u64 instruction_lctlg;
> >       u64 instruction_stctl;
> > @@ -755,12 +750,12 @@ struct kvm_vcpu_arch {
> >   };
> >
> >   struct kvm_vm_stat {
> > +     struct kvm_vm_stat_common common;
> >       u64 inject_io;
> >       u64 inject_float_mchk;
> >       u64 inject_pfault_done;
> >       u64 inject_service_signal;
> >       u64 inject_virtio;
> > -     u64 remote_tlb_flush;
> >   };
> >
> >   struct kvm_arch_memory_slot {
> > diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> > index 1296fc10f80c..d6bf3372bb10 100644
> > --- a/arch/s390/kvm/kvm-s390.c
> > +++ b/arch/s390/kvm/kvm-s390.c
> > @@ -72,13 +72,13 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
> >       VCPU_STAT("exit_program_interruption", exit_program_interruption),
> >       VCPU_STAT("exit_instr_and_program_int", exit_instr_and_program),
> >       VCPU_STAT("exit_operation_exception", exit_operation_exception),
> > -     VCPU_STAT("halt_successful_poll", halt_successful_poll),
> > -     VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> > -     VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> > +     VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> > +     VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> > +     VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> >       VCPU_STAT("halt_no_poll_steal", halt_no_poll_steal),
> > -     VCPU_STAT("halt_wakeup", halt_wakeup),
> > -     VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> > -     VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> > +     VCPU_STAT_COM("halt_wakeup", halt_wakeup),
> > +     VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> > +     VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
> >       VCPU_STAT("instruction_lctlg", instruction_lctlg),
> >       VCPU_STAT("instruction_lctl", instruction_lctl),
> >       VCPU_STAT("instruction_stctl", instruction_stctl),
> > diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
> > index 55efbacfc244..5bfd6893fbf6 100644
> > --- a/arch/x86/include/asm/kvm_host.h
> > +++ b/arch/x86/include/asm/kvm_host.h
> > @@ -1127,6 +1127,7 @@ struct kvm_arch {
> >   };
> >
> >   struct kvm_vm_stat {
> > +     struct kvm_vm_stat_common common;
> >       ulong mmu_shadow_zapped;
> >       ulong mmu_pte_write;
> >       ulong mmu_pde_zapped;
> > @@ -1134,13 +1135,13 @@ struct kvm_vm_stat {
> >       ulong mmu_recycled;
> >       ulong mmu_cache_miss;
> >       ulong mmu_unsync;
> > -     ulong remote_tlb_flush;
> >       ulong lpages;
> >       ulong nx_lpage_splits;
> >       ulong max_mmu_page_hash_collisions;
> >   };
> >
> >   struct kvm_vcpu_stat {
> > +     struct kvm_vcpu_stat_common common;
> >       u64 pf_fixed;
> >       u64 pf_guest;
> >       u64 tlb_flush;
> > @@ -1154,10 +1155,6 @@ struct kvm_vcpu_stat {
> >       u64 nmi_window_exits;
> >       u64 l1d_flush;
> >       u64 halt_exits;
> > -     u64 halt_successful_poll;
> > -     u64 halt_attempted_poll;
> > -     u64 halt_poll_invalid;
> > -     u64 halt_wakeup;
> >       u64 request_irq_exits;
> >       u64 irq_exits;
> >       u64 host_state_reload;
> > @@ -1168,8 +1165,6 @@ struct kvm_vcpu_stat {
> >       u64 irq_injections;
> >       u64 nmi_injections;
> >       u64 req_event;
> > -     u64 halt_poll_success_ns;
> > -     u64 halt_poll_fail_ns;
> >       u64 nested_run;
> >       u64 directed_yield_attempted;
> >       u64 directed_yield_successful;
> > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> > index 9b6bca616929..9a93d80caff6 100644
> > --- a/arch/x86/kvm/x86.c
> > +++ b/arch/x86/kvm/x86.c
> > @@ -226,10 +226,10 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
> >       VCPU_STAT("irq_window", irq_window_exits),
> >       VCPU_STAT("nmi_window", nmi_window_exits),
> >       VCPU_STAT("halt_exits", halt_exits),
> > -     VCPU_STAT("halt_successful_poll", halt_successful_poll),
> > -     VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> > -     VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> > -     VCPU_STAT("halt_wakeup", halt_wakeup),
> > +     VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> > +     VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> > +     VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> > +     VCPU_STAT_COM("halt_wakeup", halt_wakeup),
> >       VCPU_STAT("hypercalls", hypercalls),
> >       VCPU_STAT("request_irq", request_irq_exits),
> >       VCPU_STAT("irq_exits", irq_exits),
> > @@ -241,8 +241,8 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
> >       VCPU_STAT("nmi_injections", nmi_injections),
> >       VCPU_STAT("req_event", req_event),
> >       VCPU_STAT("l1d_flush", l1d_flush),
> > -     VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> > -     VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> > +     VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> > +     VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
> >       VCPU_STAT("nested_run", nested_run),
> >       VCPU_STAT("directed_yield_attempted", directed_yield_attempted),
> >       VCPU_STAT("directed_yield_successful", directed_yield_successful),
> > @@ -253,7 +253,7 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
> >       VM_STAT("mmu_recycled", mmu_recycled),
> >       VM_STAT("mmu_cache_miss", mmu_cache_miss),
> >       VM_STAT("mmu_unsync", mmu_unsync),
> > -     VM_STAT("remote_tlb_flush", remote_tlb_flush),
> > +     VM_STAT_COM("remote_tlb_flush", remote_tlb_flush),
> >       VM_STAT("largepages", lpages, .mode = 0444),
> >       VM_STAT("nx_largepages_splitted", nx_lpage_splits, .mode = 0444),
> >       VM_STAT("max_mmu_page_hash_collisions", max_mmu_page_hash_collisions),
> > diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> > index 2f34487e21f2..97700e41db3b 100644
> > --- a/include/linux/kvm_host.h
> > +++ b/include/linux/kvm_host.h
> > @@ -1243,10 +1243,15 @@ struct kvm_stats_debugfs_item {
> >   #define KVM_DBGFS_GET_MODE(dbgfs_item)                                         \
> >       ((dbgfs_item)->mode ? (dbgfs_item)->mode : 0644)
> >
> > -#define VM_STAT(n, x, ...)                                                   \
> > +#define VM_STAT(n, x, ...)                                                  \
> >       { n, offsetof(struct kvm, stat.x), KVM_STAT_VM, ## __VA_ARGS__ }
> > -#define VCPU_STAT(n, x, ...)                                                 \
> > +#define VCPU_STAT(n, x, ...)                                                \
> >       { n, offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU, ## __VA_ARGS__ }
> > +#define VM_STAT_COM(n, x, ...)                                                      \
> > +     { n, offsetof(struct kvm, stat.common.x), KVM_STAT_VM, ## __VA_ARGS__ }
> > +#define VCPU_STAT_COM(n, x, ...)                                            \
> > +     { n, offsetof(struct kvm_vcpu, stat.common.x),                         \
> > +       KVM_STAT_VCPU, ## __VA_ARGS__ }
> >
> >   extern struct kvm_stats_debugfs_item debugfs_entries[];
> >   extern struct dentry *kvm_debugfs_dir;
> > diff --git a/include/linux/kvm_types.h b/include/linux/kvm_types.h
> > index a7580f69dda0..87eb05ad678b 100644
> > --- a/include/linux/kvm_types.h
> > +++ b/include/linux/kvm_types.h
> > @@ -76,5 +76,17 @@ struct kvm_mmu_memory_cache {
> >   };
> >   #endif
> >
> > +struct kvm_vm_stat_common {
>
>
> Should this be named as 'kvm_vm_stat_generic' by following the
> convention in kvm_main.c ?  For example, kvm_vm_ioctl_enable_cap()  vs.
> kvm_vm_ioctl_enable_cap_generic().
>
Sure. Thanks.
> > +     ulong remote_tlb_flush;
> > +};
> > +
> > +struct kvm_vcpu_stat_common {
>
>
> Same comment as above.
>
> > +     u64 halt_successful_poll;
> > +     u64 halt_attempted_poll;
> > +     u64 halt_poll_invalid;
> > +     u64 halt_wakeup;
> > +     u64 halt_poll_success_ns;
> > +     u64 halt_poll_fail_ns;
> > +};
> >
> >   #endif /* __KVM_TYPES_H__ */
> > diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> > index 6b4feb92dc79..34a4cf265297 100644
> > --- a/virt/kvm/kvm_main.c
> > +++ b/virt/kvm/kvm_main.c
> > @@ -330,7 +330,7 @@ void kvm_flush_remote_tlbs(struct kvm *kvm)
> >        */
> >       if (!kvm_arch_flush_remote_tlb(kvm)
> >           || kvm_make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
> > -             ++kvm->stat.remote_tlb_flush;
> > +             ++kvm->stat.common.remote_tlb_flush;
> >       cmpxchg(&kvm->tlbs_dirty, dirty_count, 0);
> >   }
> >   EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs);
> > @@ -2940,9 +2940,9 @@ static inline void
> >   update_halt_poll_stats(struct kvm_vcpu *vcpu, u64 poll_ns, bool waited)
> >   {
> >       if (waited)
> > -             vcpu->stat.halt_poll_fail_ns += poll_ns;
> > +             vcpu->stat.common.halt_poll_fail_ns += poll_ns;
> >       else
> > -             vcpu->stat.halt_poll_success_ns += poll_ns;
> > +             vcpu->stat.common.halt_poll_success_ns += poll_ns;
> >   }
> >
> >   /*
> > @@ -2960,16 +2960,16 @@ void kvm_vcpu_block(struct kvm_vcpu *vcpu)
> >       if (vcpu->halt_poll_ns && !kvm_arch_no_poll(vcpu)) {
> >               ktime_t stop = ktime_add_ns(ktime_get(), vcpu->halt_poll_ns);
> >
> > -             ++vcpu->stat.halt_attempted_poll;
> > +             ++vcpu->stat.common.halt_attempted_poll;
> >               do {
> >                       /*
> >                        * This sets KVM_REQ_UNHALT if an interrupt
> >                        * arrives.
> >                        */
> >                       if (kvm_vcpu_check_block(vcpu) < 0) {
> > -                             ++vcpu->stat.halt_successful_poll;
> > +                             ++vcpu->stat.common.halt_successful_poll;
> >                               if (!vcpu_valid_wakeup(vcpu))
> > -                                     ++vcpu->stat.halt_poll_invalid;
> > +                                     ++vcpu->stat.common.halt_poll_invalid;
> >                               goto out;
> >                       }
> >                       poll_end = cur = ktime_get();
> > @@ -3027,7 +3027,7 @@ bool kvm_vcpu_wake_up(struct kvm_vcpu *vcpu)
> >       waitp = kvm_arch_vcpu_get_wait(vcpu);
> >       if (rcuwait_wake_up(waitp)) {
> >               WRITE_ONCE(vcpu->ready, true);
> > -             ++vcpu->stat.halt_wakeup;
> > +             ++vcpu->stat.common.halt_wakeup;
> >               return true;
> >       }
> >

Re: [PATCH v6 1/4] KVM: stats: Separate common stats from architecture specific ones

[Jing Zhang]

Hi Krish,

On Tue, May 25, 2021 at 2:49 PM Krish Sadhukhan
<krish.sadhukhan@oracle.com> wrote:
>
>
> On 5/24/21 8:18 AM, Jing Zhang wrote:
> > Put all common statistics in a separate structure to ease
> > statistics handling for the incoming new statistics API.
> >
> > No functional change intended.
> >
> > Reviewed-by: David Matlack <dmatlack@google.com>
> > Reviewed-by: Ricardo Koller <ricarkol@google.com>
> > Signed-off-by: Jing Zhang <jingzhangos@google.com>
> > ---
> >   arch/arm64/include/asm/kvm_host.h   |  9 ++-------
> >   arch/arm64/kvm/guest.c              | 12 ++++++------
> >   arch/mips/include/asm/kvm_host.h    |  9 ++-------
> >   arch/mips/kvm/mips.c                | 12 ++++++------
> >   arch/powerpc/include/asm/kvm_host.h |  9 ++-------
> >   arch/powerpc/kvm/book3s.c           | 12 ++++++------
> >   arch/powerpc/kvm/book3s_hv.c        | 12 ++++++------
> >   arch/powerpc/kvm/book3s_pr.c        |  2 +-
> >   arch/powerpc/kvm/book3s_pr_papr.c   |  2 +-
> >   arch/powerpc/kvm/booke.c            | 14 +++++++-------
> >   arch/s390/include/asm/kvm_host.h    |  9 ++-------
> >   arch/s390/kvm/kvm-s390.c            | 12 ++++++------
> >   arch/x86/include/asm/kvm_host.h     |  9 ++-------
> >   arch/x86/kvm/x86.c                  | 14 +++++++-------
> >   include/linux/kvm_host.h            |  9 +++++++--
> >   include/linux/kvm_types.h           | 12 ++++++++++++
> >   virt/kvm/kvm_main.c                 | 14 +++++++-------
> >   17 files changed, 82 insertions(+), 90 deletions(-)
> >
> > diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
> > index 7cd7d5c8c4bc..f3ad7a20b0af 100644
> > --- a/arch/arm64/include/asm/kvm_host.h
> > +++ b/arch/arm64/include/asm/kvm_host.h
> > @@ -556,16 +556,11 @@ static inline bool __vcpu_write_sys_reg_to_cpu(u64 val, int reg)
> >   }
> >
> >   struct kvm_vm_stat {
> > -     ulong remote_tlb_flush;
> > +     struct kvm_vm_stat_common common;
> >   };
> >
> >   struct kvm_vcpu_stat {
> > -     u64 halt_successful_poll;
> > -     u64 halt_attempted_poll;
> > -     u64 halt_poll_success_ns;
> > -     u64 halt_poll_fail_ns;
> > -     u64 halt_poll_invalid;
> > -     u64 halt_wakeup;
> > +     struct kvm_vcpu_stat_common common;
> >       u64 hvc_exit_stat;
> >       u64 wfe_exit_stat;
> >       u64 wfi_exit_stat;
> > diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
> > index 5cb4a1cd5603..0e41331b0911 100644
> > --- a/arch/arm64/kvm/guest.c
> > +++ b/arch/arm64/kvm/guest.c
> > @@ -29,18 +29,18 @@
> >   #include "trace.h"
> >
> >   struct kvm_stats_debugfs_item debugfs_entries[] = {
> > -     VCPU_STAT("halt_successful_poll", halt_successful_poll),
> > -     VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> > -     VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> > -     VCPU_STAT("halt_wakeup", halt_wakeup),
> > +     VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> > +     VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> > +     VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> > +     VCPU_STAT_COM("halt_wakeup", halt_wakeup),
> >       VCPU_STAT("hvc_exit_stat", hvc_exit_stat),
> >       VCPU_STAT("wfe_exit_stat", wfe_exit_stat),
> >       VCPU_STAT("wfi_exit_stat", wfi_exit_stat),
> >       VCPU_STAT("mmio_exit_user", mmio_exit_user),
> >       VCPU_STAT("mmio_exit_kernel", mmio_exit_kernel),
> >       VCPU_STAT("exits", exits),
> > -     VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> > -     VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> > +     VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> > +     VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
> >       { NULL }
> >   };
> >
> > diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h
> > index fca4547d580f..6f610fbcd8d1 100644
> > --- a/arch/mips/include/asm/kvm_host.h
> > +++ b/arch/mips/include/asm/kvm_host.h
> > @@ -109,10 +109,11 @@ static inline bool kvm_is_error_hva(unsigned long addr)
> >   }
> >
> >   struct kvm_vm_stat {
> > -     ulong remote_tlb_flush;
> > +     struct kvm_vm_stat_common common;
> >   };
> >
> >   struct kvm_vcpu_stat {
> > +     struct kvm_vcpu_stat_common common;
> >       u64 wait_exits;
> >       u64 cache_exits;
> >       u64 signal_exits;
> > @@ -142,12 +143,6 @@ struct kvm_vcpu_stat {
> >   #ifdef CONFIG_CPU_LOONGSON64
> >       u64 vz_cpucfg_exits;
> >   #endif
> > -     u64 halt_successful_poll;
> > -     u64 halt_attempted_poll;
> > -     u64 halt_poll_success_ns;
> > -     u64 halt_poll_fail_ns;
> > -     u64 halt_poll_invalid;
> > -     u64 halt_wakeup;
> >   };
> >
> >   struct kvm_arch_memory_slot {
> > diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
> > index 4d4af97dcc88..f4fc60c05e9c 100644
> > --- a/arch/mips/kvm/mips.c
> > +++ b/arch/mips/kvm/mips.c
> > @@ -68,12 +68,12 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
> >   #ifdef CONFIG_CPU_LOONGSON64
> >       VCPU_STAT("vz_cpucfg", vz_cpucfg_exits),
> >   #endif
> > -     VCPU_STAT("halt_successful_poll", halt_successful_poll),
> > -     VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> > -     VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> > -     VCPU_STAT("halt_wakeup", halt_wakeup),
> > -     VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> > -     VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> > +     VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> > +     VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> > +     VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> > +     VCPU_STAT_COM("halt_wakeup", halt_wakeup),
> > +     VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> > +     VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
> >       {NULL}
> >   };
> >
> > diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
> > index 1e83359f286b..473d9d0804ff 100644
> > --- a/arch/powerpc/include/asm/kvm_host.h
> > +++ b/arch/powerpc/include/asm/kvm_host.h
> > @@ -80,12 +80,13 @@ struct kvmppc_book3s_shadow_vcpu;
> >   struct kvm_nested_guest;
> >
> >   struct kvm_vm_stat {
> > -     ulong remote_tlb_flush;
> > +     struct kvm_vm_stat_common common;
> >       ulong num_2M_pages;
> >       ulong num_1G_pages;
> >   };
> >
> >   struct kvm_vcpu_stat {
> > +     struct kvm_vcpu_stat_common common;
> >       u64 sum_exits;
> >       u64 mmio_exits;
> >       u64 signal_exits;
> > @@ -101,14 +102,8 @@ struct kvm_vcpu_stat {
> >       u64 emulated_inst_exits;
> >       u64 dec_exits;
> >       u64 ext_intr_exits;
> > -     u64 halt_poll_success_ns;
> > -     u64 halt_poll_fail_ns;
> >       u64 halt_wait_ns;
> > -     u64 halt_successful_poll;
> > -     u64 halt_attempted_poll;
> >       u64 halt_successful_wait;
> > -     u64 halt_poll_invalid;
> > -     u64 halt_wakeup;
> >       u64 dbell_exits;
> >       u64 gdbell_exits;
> >       u64 ld;
> > diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
> > index 2b691f4d1f26..bd3a10e1fdaf 100644
> > --- a/arch/powerpc/kvm/book3s.c
> > +++ b/arch/powerpc/kvm/book3s.c
> > @@ -47,14 +47,14 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
> >       VCPU_STAT("dec", dec_exits),
> >       VCPU_STAT("ext_intr", ext_intr_exits),
> >       VCPU_STAT("queue_intr", queue_intr),
> > -     VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> > -     VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> > +     VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> > +     VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
> >       VCPU_STAT("halt_wait_ns", halt_wait_ns),
> > -     VCPU_STAT("halt_successful_poll", halt_successful_poll),
> > -     VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> > +     VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> > +     VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> >       VCPU_STAT("halt_successful_wait", halt_successful_wait),
> > -     VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> > -     VCPU_STAT("halt_wakeup", halt_wakeup),
> > +     VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> > +     VCPU_STAT_COM("halt_wakeup", halt_wakeup),
> >       VCPU_STAT("pf_storage", pf_storage),
> >       VCPU_STAT("sp_storage", sp_storage),
> >       VCPU_STAT("pf_instruc", pf_instruc),
> > diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
> > index 28a80d240b76..58e187e03c52 100644
> > --- a/arch/powerpc/kvm/book3s_hv.c
> > +++ b/arch/powerpc/kvm/book3s_hv.c
> > @@ -236,7 +236,7 @@ static void kvmppc_fast_vcpu_kick_hv(struct kvm_vcpu *vcpu)
> >
> >       waitp = kvm_arch_vcpu_get_wait(vcpu);
> >       if (rcuwait_wake_up(waitp))
> > -             ++vcpu->stat.halt_wakeup;
> > +             ++vcpu->stat.common.halt_wakeup;
> >
> >       cpu = READ_ONCE(vcpu->arch.thread_cpu);
> >       if (cpu >= 0 && kvmppc_ipi_thread(cpu))
> > @@ -3925,7 +3925,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
> >       cur = start_poll = ktime_get();
> >       if (vc->halt_poll_ns) {
> >               ktime_t stop = ktime_add_ns(start_poll, vc->halt_poll_ns);
> > -             ++vc->runner->stat.halt_attempted_poll;
> > +             ++vc->runner->stat.common.halt_attempted_poll;
> >
> >               vc->vcore_state = VCORE_POLLING;
> >               spin_unlock(&vc->lock);
> > @@ -3942,7 +3942,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
> >               vc->vcore_state = VCORE_INACTIVE;
> >
> >               if (!do_sleep) {
> > -                     ++vc->runner->stat.halt_successful_poll;
> > +                     ++vc->runner->stat.common.halt_successful_poll;
> >                       goto out;
> >               }
> >       }
> > @@ -3954,7 +3954,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
> >               do_sleep = 0;
> >               /* If we polled, count this as a successful poll */
> >               if (vc->halt_poll_ns)
> > -                     ++vc->runner->stat.halt_successful_poll;
> > +                     ++vc->runner->stat.common.halt_successful_poll;
> >               goto out;
> >       }
> >
> > @@ -3981,13 +3981,13 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
> >                       ktime_to_ns(cur) - ktime_to_ns(start_wait);
> >               /* Attribute failed poll time */
> >               if (vc->halt_poll_ns)
> > -                     vc->runner->stat.halt_poll_fail_ns +> > +                     vc->runner->stat.common.halt_poll_fail_ns +> >                               ktime_to_ns(start_wait) -
> >                               ktime_to_ns(start_poll);
> >       } else {
> >               /* Attribute successful poll time */
> >               if (vc->halt_poll_ns)
> > -                     vc->runner->stat.halt_poll_success_ns +> > +                     vc->runner->stat.common.halt_poll_success_ns +> >                               ktime_to_ns(cur) -
> >                               ktime_to_ns(start_poll);
> >       }
> > diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c
> > index d7733b07f489..214caa9d9675 100644
> > --- a/arch/powerpc/kvm/book3s_pr.c
> > +++ b/arch/powerpc/kvm/book3s_pr.c
> > @@ -493,7 +493,7 @@ static void kvmppc_set_msr_pr(struct kvm_vcpu *vcpu, u64 msr)
> >               if (!vcpu->arch.pending_exceptions) {
> >                       kvm_vcpu_block(vcpu);
> >                       kvm_clear_request(KVM_REQ_UNHALT, vcpu);
> > -                     vcpu->stat.halt_wakeup++;
> > +                     vcpu->stat.common.halt_wakeup++;
> >
> >                       /* Unset POW bit after we woke up */
> >                       msr &= ~MSR_POW;
> > diff --git a/arch/powerpc/kvm/book3s_pr_papr.c b/arch/powerpc/kvm/book3s_pr_papr.c
> > index 031c8015864a..9384625c8051 100644
> > --- a/arch/powerpc/kvm/book3s_pr_papr.c
> > +++ b/arch/powerpc/kvm/book3s_pr_papr.c
> > @@ -378,7 +378,7 @@ int kvmppc_h_pr(struct kvm_vcpu *vcpu, unsigned long cmd)
> >               kvmppc_set_msr_fast(vcpu, kvmppc_get_msr(vcpu) | MSR_EE);
> >               kvm_vcpu_block(vcpu);
> >               kvm_clear_request(KVM_REQ_UNHALT, vcpu);
> > -             vcpu->stat.halt_wakeup++;
> > +             vcpu->stat.common.halt_wakeup++;
> >               return EMULATE_DONE;
> >       case H_LOGICAL_CI_LOAD:
> >               return kvmppc_h_pr_logical_ci_load(vcpu);
> > diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
> > index 7d5fe43f85c4..07fdd7a1254a 100644
> > --- a/arch/powerpc/kvm/booke.c
> > +++ b/arch/powerpc/kvm/booke.c
> > @@ -49,15 +49,15 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
> >       VCPU_STAT("inst_emu", emulated_inst_exits),
> >       VCPU_STAT("dec", dec_exits),
> >       VCPU_STAT("ext_intr", ext_intr_exits),
> > -     VCPU_STAT("halt_successful_poll", halt_successful_poll),
> > -     VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> > -     VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> > -     VCPU_STAT("halt_wakeup", halt_wakeup),
> > +     VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> > +     VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> > +     VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> > +     VCPU_STAT_COM("halt_wakeup", halt_wakeup),
> >       VCPU_STAT("doorbell", dbell_exits),
> >       VCPU_STAT("guest doorbell", gdbell_exits),
> > -     VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> > -     VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> > -     VM_STAT("remote_tlb_flush", remote_tlb_flush),
> > +     VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> > +     VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
> > +     VM_STAT_COM("remote_tlb_flush", remote_tlb_flush),
> >       { NULL }
> >   };
> >
> > diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
> > index 8925f3969478..57a20897f3db 100644
> > --- a/arch/s390/include/asm/kvm_host.h
> > +++ b/arch/s390/include/asm/kvm_host.h
> > @@ -361,6 +361,7 @@ struct sie_page {
> >   };
> >
> >   struct kvm_vcpu_stat {
> > +     struct kvm_vcpu_stat_common common;
> >       u64 exit_userspace;
> >       u64 exit_null;
> >       u64 exit_external_request;
> > @@ -370,13 +371,7 @@ struct kvm_vcpu_stat {
> >       u64 exit_validity;
> >       u64 exit_instruction;
> >       u64 exit_pei;
> > -     u64 halt_successful_poll;
> > -     u64 halt_attempted_poll;
> > -     u64 halt_poll_invalid;
> >       u64 halt_no_poll_steal;
> > -     u64 halt_wakeup;
> > -     u64 halt_poll_success_ns;
> > -     u64 halt_poll_fail_ns;
> >       u64 instruction_lctl;
> >       u64 instruction_lctlg;
> >       u64 instruction_stctl;
> > @@ -755,12 +750,12 @@ struct kvm_vcpu_arch {
> >   };
> >
> >   struct kvm_vm_stat {
> > +     struct kvm_vm_stat_common common;
> >       u64 inject_io;
> >       u64 inject_float_mchk;
> >       u64 inject_pfault_done;
> >       u64 inject_service_signal;
> >       u64 inject_virtio;
> > -     u64 remote_tlb_flush;
> >   };
> >
> >   struct kvm_arch_memory_slot {
> > diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> > index 1296fc10f80c..d6bf3372bb10 100644
> > --- a/arch/s390/kvm/kvm-s390.c
> > +++ b/arch/s390/kvm/kvm-s390.c
> > @@ -72,13 +72,13 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
> >       VCPU_STAT("exit_program_interruption", exit_program_interruption),
> >       VCPU_STAT("exit_instr_and_program_int", exit_instr_and_program),
> >       VCPU_STAT("exit_operation_exception", exit_operation_exception),
> > -     VCPU_STAT("halt_successful_poll", halt_successful_poll),
> > -     VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> > -     VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> > +     VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> > +     VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> > +     VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> >       VCPU_STAT("halt_no_poll_steal", halt_no_poll_steal),
> > -     VCPU_STAT("halt_wakeup", halt_wakeup),
> > -     VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> > -     VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> > +     VCPU_STAT_COM("halt_wakeup", halt_wakeup),
> > +     VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> > +     VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
> >       VCPU_STAT("instruction_lctlg", instruction_lctlg),
> >       VCPU_STAT("instruction_lctl", instruction_lctl),
> >       VCPU_STAT("instruction_stctl", instruction_stctl),
> > diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
> > index 55efbacfc244..5bfd6893fbf6 100644
> > --- a/arch/x86/include/asm/kvm_host.h
> > +++ b/arch/x86/include/asm/kvm_host.h
> > @@ -1127,6 +1127,7 @@ struct kvm_arch {
> >   };
> >
> >   struct kvm_vm_stat {
> > +     struct kvm_vm_stat_common common;
> >       ulong mmu_shadow_zapped;
> >       ulong mmu_pte_write;
> >       ulong mmu_pde_zapped;
> > @@ -1134,13 +1135,13 @@ struct kvm_vm_stat {
> >       ulong mmu_recycled;
> >       ulong mmu_cache_miss;
> >       ulong mmu_unsync;
> > -     ulong remote_tlb_flush;
> >       ulong lpages;
> >       ulong nx_lpage_splits;
> >       ulong max_mmu_page_hash_collisions;
> >   };
> >
> >   struct kvm_vcpu_stat {
> > +     struct kvm_vcpu_stat_common common;
> >       u64 pf_fixed;
> >       u64 pf_guest;
> >       u64 tlb_flush;
> > @@ -1154,10 +1155,6 @@ struct kvm_vcpu_stat {
> >       u64 nmi_window_exits;
> >       u64 l1d_flush;
> >       u64 halt_exits;
> > -     u64 halt_successful_poll;
> > -     u64 halt_attempted_poll;
> > -     u64 halt_poll_invalid;
> > -     u64 halt_wakeup;
> >       u64 request_irq_exits;
> >       u64 irq_exits;
> >       u64 host_state_reload;
> > @@ -1168,8 +1165,6 @@ struct kvm_vcpu_stat {
> >       u64 irq_injections;
> >       u64 nmi_injections;
> >       u64 req_event;
> > -     u64 halt_poll_success_ns;
> > -     u64 halt_poll_fail_ns;
> >       u64 nested_run;
> >       u64 directed_yield_attempted;
> >       u64 directed_yield_successful;
> > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> > index 9b6bca616929..9a93d80caff6 100644
> > --- a/arch/x86/kvm/x86.c
> > +++ b/arch/x86/kvm/x86.c
> > @@ -226,10 +226,10 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
> >       VCPU_STAT("irq_window", irq_window_exits),
> >       VCPU_STAT("nmi_window", nmi_window_exits),
> >       VCPU_STAT("halt_exits", halt_exits),
> > -     VCPU_STAT("halt_successful_poll", halt_successful_poll),
> > -     VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> > -     VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> > -     VCPU_STAT("halt_wakeup", halt_wakeup),
> > +     VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> > +     VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> > +     VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> > +     VCPU_STAT_COM("halt_wakeup", halt_wakeup),
> >       VCPU_STAT("hypercalls", hypercalls),
> >       VCPU_STAT("request_irq", request_irq_exits),
> >       VCPU_STAT("irq_exits", irq_exits),
> > @@ -241,8 +241,8 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
> >       VCPU_STAT("nmi_injections", nmi_injections),
> >       VCPU_STAT("req_event", req_event),
> >       VCPU_STAT("l1d_flush", l1d_flush),
> > -     VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> > -     VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> > +     VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> > +     VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
> >       VCPU_STAT("nested_run", nested_run),
> >       VCPU_STAT("directed_yield_attempted", directed_yield_attempted),
> >       VCPU_STAT("directed_yield_successful", directed_yield_successful),
> > @@ -253,7 +253,7 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
> >       VM_STAT("mmu_recycled", mmu_recycled),
> >       VM_STAT("mmu_cache_miss", mmu_cache_miss),
> >       VM_STAT("mmu_unsync", mmu_unsync),
> > -     VM_STAT("remote_tlb_flush", remote_tlb_flush),
> > +     VM_STAT_COM("remote_tlb_flush", remote_tlb_flush),
> >       VM_STAT("largepages", lpages, .mode = 0444),
> >       VM_STAT("nx_largepages_splitted", nx_lpage_splits, .mode = 0444),
> >       VM_STAT("max_mmu_page_hash_collisions", max_mmu_page_hash_collisions),
> > diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> > index 2f34487e21f2..97700e41db3b 100644
> > --- a/include/linux/kvm_host.h
> > +++ b/include/linux/kvm_host.h
> > @@ -1243,10 +1243,15 @@ struct kvm_stats_debugfs_item {
> >   #define KVM_DBGFS_GET_MODE(dbgfs_item)                                         \
> >       ((dbgfs_item)->mode ? (dbgfs_item)->mode : 0644)
> >
> > -#define VM_STAT(n, x, ...)                                                   \
> > +#define VM_STAT(n, x, ...)                                                  \
> >       { n, offsetof(struct kvm, stat.x), KVM_STAT_VM, ## __VA_ARGS__ }
> > -#define VCPU_STAT(n, x, ...)                                                 \
> > +#define VCPU_STAT(n, x, ...)                                                \
> >       { n, offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU, ## __VA_ARGS__ }
> > +#define VM_STAT_COM(n, x, ...)                                                      \
> > +     { n, offsetof(struct kvm, stat.common.x), KVM_STAT_VM, ## __VA_ARGS__ }
> > +#define VCPU_STAT_COM(n, x, ...)                                            \
> > +     { n, offsetof(struct kvm_vcpu, stat.common.x),                         \
> > +       KVM_STAT_VCPU, ## __VA_ARGS__ }
> >
> >   extern struct kvm_stats_debugfs_item debugfs_entries[];
> >   extern struct dentry *kvm_debugfs_dir;
> > diff --git a/include/linux/kvm_types.h b/include/linux/kvm_types.h
> > index a7580f69dda0..87eb05ad678b 100644
> > --- a/include/linux/kvm_types.h
> > +++ b/include/linux/kvm_types.h
> > @@ -76,5 +76,17 @@ struct kvm_mmu_memory_cache {
> >   };
> >   #endif
> >
> > +struct kvm_vm_stat_common {
>
>
> Should this be named as 'kvm_vm_stat_generic' by following the
> convention in kvm_main.c ?  For example, kvm_vm_ioctl_enable_cap()  vs.
> kvm_vm_ioctl_enable_cap_generic().
>
Sure. Thanks.
> > +     ulong remote_tlb_flush;
> > +};
> > +
> > +struct kvm_vcpu_stat_common {
>
>
> Same comment as above.
>
> > +     u64 halt_successful_poll;
> > +     u64 halt_attempted_poll;
> > +     u64 halt_poll_invalid;
> > +     u64 halt_wakeup;
> > +     u64 halt_poll_success_ns;
> > +     u64 halt_poll_fail_ns;
> > +};
> >
> >   #endif /* __KVM_TYPES_H__ */
> > diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> > index 6b4feb92dc79..34a4cf265297 100644
> > --- a/virt/kvm/kvm_main.c
> > +++ b/virt/kvm/kvm_main.c
> > @@ -330,7 +330,7 @@ void kvm_flush_remote_tlbs(struct kvm *kvm)
> >        */
> >       if (!kvm_arch_flush_remote_tlb(kvm)
> >           || kvm_make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
> > -             ++kvm->stat.remote_tlb_flush;
> > +             ++kvm->stat.common.remote_tlb_flush;
> >       cmpxchg(&kvm->tlbs_dirty, dirty_count, 0);
> >   }
> >   EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs);
> > @@ -2940,9 +2940,9 @@ static inline void
> >   update_halt_poll_stats(struct kvm_vcpu *vcpu, u64 poll_ns, bool waited)
> >   {
> >       if (waited)
> > -             vcpu->stat.halt_poll_fail_ns += poll_ns;
> > +             vcpu->stat.common.halt_poll_fail_ns += poll_ns;
> >       else
> > -             vcpu->stat.halt_poll_success_ns += poll_ns;
> > +             vcpu->stat.common.halt_poll_success_ns += poll_ns;
> >   }
> >
> >   /*
> > @@ -2960,16 +2960,16 @@ void kvm_vcpu_block(struct kvm_vcpu *vcpu)
> >       if (vcpu->halt_poll_ns && !kvm_arch_no_poll(vcpu)) {
> >               ktime_t stop = ktime_add_ns(ktime_get(), vcpu->halt_poll_ns);
> >
> > -             ++vcpu->stat.halt_attempted_poll;
> > +             ++vcpu->stat.common.halt_attempted_poll;
> >               do {
> >                       /*
> >                        * This sets KVM_REQ_UNHALT if an interrupt
> >                        * arrives.
> >                        */
> >                       if (kvm_vcpu_check_block(vcpu) < 0) {
> > -                             ++vcpu->stat.halt_successful_poll;
> > +                             ++vcpu->stat.common.halt_successful_poll;
> >                               if (!vcpu_valid_wakeup(vcpu))
> > -                                     ++vcpu->stat.halt_poll_invalid;
> > +                                     ++vcpu->stat.common.halt_poll_invalid;
> >                               goto out;
> >                       }
> >                       poll_end = cur = ktime_get();
> > @@ -3027,7 +3027,7 @@ bool kvm_vcpu_wake_up(struct kvm_vcpu *vcpu)
> >       waitp = kvm_arch_vcpu_get_wait(vcpu);
> >       if (rcuwait_wake_up(waitp)) {
> >               WRITE_ONCE(vcpu->ready, true);
> > -             ++vcpu->stat.halt_wakeup;
> > +             ++vcpu->stat.common.halt_wakeup;
> >               return true;
> >       }
> >

Re: [PATCH v6 1/4] KVM: stats: Separate common stats from architecture specific ones

[Jing Zhang]

Hi Krish,

On Tue, May 25, 2021 at 2:49 PM Krish Sadhukhan
<krish.sadhukhan@oracle.com> wrote:
>
>
> On 5/24/21 8:18 AM, Jing Zhang wrote:
> > Put all common statistics in a separate structure to ease
> > statistics handling for the incoming new statistics API.
> >
> > No functional change intended.
> >
> > Reviewed-by: David Matlack <dmatlack@google.com>
> > Reviewed-by: Ricardo Koller <ricarkol@google.com>
> > Signed-off-by: Jing Zhang <jingzhangos@google.com>
> > ---
> >   arch/arm64/include/asm/kvm_host.h   |  9 ++-------
> >   arch/arm64/kvm/guest.c              | 12 ++++++------
> >   arch/mips/include/asm/kvm_host.h    |  9 ++-------
> >   arch/mips/kvm/mips.c                | 12 ++++++------
> >   arch/powerpc/include/asm/kvm_host.h |  9 ++-------
> >   arch/powerpc/kvm/book3s.c           | 12 ++++++------
> >   arch/powerpc/kvm/book3s_hv.c        | 12 ++++++------
> >   arch/powerpc/kvm/book3s_pr.c        |  2 +-
> >   arch/powerpc/kvm/book3s_pr_papr.c   |  2 +-
> >   arch/powerpc/kvm/booke.c            | 14 +++++++-------
> >   arch/s390/include/asm/kvm_host.h    |  9 ++-------
> >   arch/s390/kvm/kvm-s390.c            | 12 ++++++------
> >   arch/x86/include/asm/kvm_host.h     |  9 ++-------
> >   arch/x86/kvm/x86.c                  | 14 +++++++-------
> >   include/linux/kvm_host.h            |  9 +++++++--
> >   include/linux/kvm_types.h           | 12 ++++++++++++
> >   virt/kvm/kvm_main.c                 | 14 +++++++-------
> >   17 files changed, 82 insertions(+), 90 deletions(-)
> >
> > diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
> > index 7cd7d5c8c4bc..f3ad7a20b0af 100644
> > --- a/arch/arm64/include/asm/kvm_host.h
> > +++ b/arch/arm64/include/asm/kvm_host.h
> > @@ -556,16 +556,11 @@ static inline bool __vcpu_write_sys_reg_to_cpu(u64 val, int reg)
> >   }
> >
> >   struct kvm_vm_stat {
> > -     ulong remote_tlb_flush;
> > +     struct kvm_vm_stat_common common;
> >   };
> >
> >   struct kvm_vcpu_stat {
> > -     u64 halt_successful_poll;
> > -     u64 halt_attempted_poll;
> > -     u64 halt_poll_success_ns;
> > -     u64 halt_poll_fail_ns;
> > -     u64 halt_poll_invalid;
> > -     u64 halt_wakeup;
> > +     struct kvm_vcpu_stat_common common;
> >       u64 hvc_exit_stat;
> >       u64 wfe_exit_stat;
> >       u64 wfi_exit_stat;
> > diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
> > index 5cb4a1cd5603..0e41331b0911 100644
> > --- a/arch/arm64/kvm/guest.c
> > +++ b/arch/arm64/kvm/guest.c
> > @@ -29,18 +29,18 @@
> >   #include "trace.h"
> >
> >   struct kvm_stats_debugfs_item debugfs_entries[] = {
> > -     VCPU_STAT("halt_successful_poll", halt_successful_poll),
> > -     VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> > -     VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> > -     VCPU_STAT("halt_wakeup", halt_wakeup),
> > +     VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> > +     VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> > +     VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> > +     VCPU_STAT_COM("halt_wakeup", halt_wakeup),
> >       VCPU_STAT("hvc_exit_stat", hvc_exit_stat),
> >       VCPU_STAT("wfe_exit_stat", wfe_exit_stat),
> >       VCPU_STAT("wfi_exit_stat", wfi_exit_stat),
> >       VCPU_STAT("mmio_exit_user", mmio_exit_user),
> >       VCPU_STAT("mmio_exit_kernel", mmio_exit_kernel),
> >       VCPU_STAT("exits", exits),
> > -     VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> > -     VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> > +     VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> > +     VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
> >       { NULL }
> >   };
> >
> > diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h
> > index fca4547d580f..6f610fbcd8d1 100644
> > --- a/arch/mips/include/asm/kvm_host.h
> > +++ b/arch/mips/include/asm/kvm_host.h
> > @@ -109,10 +109,11 @@ static inline bool kvm_is_error_hva(unsigned long addr)
> >   }
> >
> >   struct kvm_vm_stat {
> > -     ulong remote_tlb_flush;
> > +     struct kvm_vm_stat_common common;
> >   };
> >
> >   struct kvm_vcpu_stat {
> > +     struct kvm_vcpu_stat_common common;
> >       u64 wait_exits;
> >       u64 cache_exits;
> >       u64 signal_exits;
> > @@ -142,12 +143,6 @@ struct kvm_vcpu_stat {
> >   #ifdef CONFIG_CPU_LOONGSON64
> >       u64 vz_cpucfg_exits;
> >   #endif
> > -     u64 halt_successful_poll;
> > -     u64 halt_attempted_poll;
> > -     u64 halt_poll_success_ns;
> > -     u64 halt_poll_fail_ns;
> > -     u64 halt_poll_invalid;
> > -     u64 halt_wakeup;
> >   };
> >
> >   struct kvm_arch_memory_slot {
> > diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
> > index 4d4af97dcc88..f4fc60c05e9c 100644
> > --- a/arch/mips/kvm/mips.c
> > +++ b/arch/mips/kvm/mips.c
> > @@ -68,12 +68,12 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
> >   #ifdef CONFIG_CPU_LOONGSON64
> >       VCPU_STAT("vz_cpucfg", vz_cpucfg_exits),
> >   #endif
> > -     VCPU_STAT("halt_successful_poll", halt_successful_poll),
> > -     VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> > -     VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> > -     VCPU_STAT("halt_wakeup", halt_wakeup),
> > -     VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> > -     VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> > +     VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> > +     VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> > +     VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> > +     VCPU_STAT_COM("halt_wakeup", halt_wakeup),
> > +     VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> > +     VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
> >       {NULL}
> >   };
> >
> > diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
> > index 1e83359f286b..473d9d0804ff 100644
> > --- a/arch/powerpc/include/asm/kvm_host.h
> > +++ b/arch/powerpc/include/asm/kvm_host.h
> > @@ -80,12 +80,13 @@ struct kvmppc_book3s_shadow_vcpu;
> >   struct kvm_nested_guest;
> >
> >   struct kvm_vm_stat {
> > -     ulong remote_tlb_flush;
> > +     struct kvm_vm_stat_common common;
> >       ulong num_2M_pages;
> >       ulong num_1G_pages;
> >   };
> >
> >   struct kvm_vcpu_stat {
> > +     struct kvm_vcpu_stat_common common;
> >       u64 sum_exits;
> >       u64 mmio_exits;
> >       u64 signal_exits;
> > @@ -101,14 +102,8 @@ struct kvm_vcpu_stat {
> >       u64 emulated_inst_exits;
> >       u64 dec_exits;
> >       u64 ext_intr_exits;
> > -     u64 halt_poll_success_ns;
> > -     u64 halt_poll_fail_ns;
> >       u64 halt_wait_ns;
> > -     u64 halt_successful_poll;
> > -     u64 halt_attempted_poll;
> >       u64 halt_successful_wait;
> > -     u64 halt_poll_invalid;
> > -     u64 halt_wakeup;
> >       u64 dbell_exits;
> >       u64 gdbell_exits;
> >       u64 ld;
> > diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
> > index 2b691f4d1f26..bd3a10e1fdaf 100644
> > --- a/arch/powerpc/kvm/book3s.c
> > +++ b/arch/powerpc/kvm/book3s.c
> > @@ -47,14 +47,14 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
> >       VCPU_STAT("dec", dec_exits),
> >       VCPU_STAT("ext_intr", ext_intr_exits),
> >       VCPU_STAT("queue_intr", queue_intr),
> > -     VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> > -     VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> > +     VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> > +     VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
> >       VCPU_STAT("halt_wait_ns", halt_wait_ns),
> > -     VCPU_STAT("halt_successful_poll", halt_successful_poll),
> > -     VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> > +     VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> > +     VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> >       VCPU_STAT("halt_successful_wait", halt_successful_wait),
> > -     VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> > -     VCPU_STAT("halt_wakeup", halt_wakeup),
> > +     VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> > +     VCPU_STAT_COM("halt_wakeup", halt_wakeup),
> >       VCPU_STAT("pf_storage", pf_storage),
> >       VCPU_STAT("sp_storage", sp_storage),
> >       VCPU_STAT("pf_instruc", pf_instruc),
> > diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
> > index 28a80d240b76..58e187e03c52 100644
> > --- a/arch/powerpc/kvm/book3s_hv.c
> > +++ b/arch/powerpc/kvm/book3s_hv.c
> > @@ -236,7 +236,7 @@ static void kvmppc_fast_vcpu_kick_hv(struct kvm_vcpu *vcpu)
> >
> >       waitp = kvm_arch_vcpu_get_wait(vcpu);
> >       if (rcuwait_wake_up(waitp))
> > -             ++vcpu->stat.halt_wakeup;
> > +             ++vcpu->stat.common.halt_wakeup;
> >
> >       cpu = READ_ONCE(vcpu->arch.thread_cpu);
> >       if (cpu >= 0 && kvmppc_ipi_thread(cpu))
> > @@ -3925,7 +3925,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
> >       cur = start_poll = ktime_get();
> >       if (vc->halt_poll_ns) {
> >               ktime_t stop = ktime_add_ns(start_poll, vc->halt_poll_ns);
> > -             ++vc->runner->stat.halt_attempted_poll;
> > +             ++vc->runner->stat.common.halt_attempted_poll;
> >
> >               vc->vcore_state = VCORE_POLLING;
> >               spin_unlock(&vc->lock);
> > @@ -3942,7 +3942,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
> >               vc->vcore_state = VCORE_INACTIVE;
> >
> >               if (!do_sleep) {
> > -                     ++vc->runner->stat.halt_successful_poll;
> > +                     ++vc->runner->stat.common.halt_successful_poll;
> >                       goto out;
> >               }
> >       }
> > @@ -3954,7 +3954,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
> >               do_sleep = 0;
> >               /* If we polled, count this as a successful poll */
> >               if (vc->halt_poll_ns)
> > -                     ++vc->runner->stat.halt_successful_poll;
> > +                     ++vc->runner->stat.common.halt_successful_poll;
> >               goto out;
> >       }
> >
> > @@ -3981,13 +3981,13 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
> >                       ktime_to_ns(cur) - ktime_to_ns(start_wait);
> >               /* Attribute failed poll time */
> >               if (vc->halt_poll_ns)
> > -                     vc->runner->stat.halt_poll_fail_ns +=
> > +                     vc->runner->stat.common.halt_poll_fail_ns +=
> >                               ktime_to_ns(start_wait) -
> >                               ktime_to_ns(start_poll);
> >       } else {
> >               /* Attribute successful poll time */
> >               if (vc->halt_poll_ns)
> > -                     vc->runner->stat.halt_poll_success_ns +=
> > +                     vc->runner->stat.common.halt_poll_success_ns +=
> >                               ktime_to_ns(cur) -
> >                               ktime_to_ns(start_poll);
> >       }
> > diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c
> > index d7733b07f489..214caa9d9675 100644
> > --- a/arch/powerpc/kvm/book3s_pr.c
> > +++ b/arch/powerpc/kvm/book3s_pr.c
> > @@ -493,7 +493,7 @@ static void kvmppc_set_msr_pr(struct kvm_vcpu *vcpu, u64 msr)
> >               if (!vcpu->arch.pending_exceptions) {
> >                       kvm_vcpu_block(vcpu);
> >                       kvm_clear_request(KVM_REQ_UNHALT, vcpu);
> > -                     vcpu->stat.halt_wakeup++;
> > +                     vcpu->stat.common.halt_wakeup++;
> >
> >                       /* Unset POW bit after we woke up */
> >                       msr &= ~MSR_POW;
> > diff --git a/arch/powerpc/kvm/book3s_pr_papr.c b/arch/powerpc/kvm/book3s_pr_papr.c
> > index 031c8015864a..9384625c8051 100644
> > --- a/arch/powerpc/kvm/book3s_pr_papr.c
> > +++ b/arch/powerpc/kvm/book3s_pr_papr.c
> > @@ -378,7 +378,7 @@ int kvmppc_h_pr(struct kvm_vcpu *vcpu, unsigned long cmd)
> >               kvmppc_set_msr_fast(vcpu, kvmppc_get_msr(vcpu) | MSR_EE);
> >               kvm_vcpu_block(vcpu);
> >               kvm_clear_request(KVM_REQ_UNHALT, vcpu);
> > -             vcpu->stat.halt_wakeup++;
> > +             vcpu->stat.common.halt_wakeup++;
> >               return EMULATE_DONE;
> >       case H_LOGICAL_CI_LOAD:
> >               return kvmppc_h_pr_logical_ci_load(vcpu);
> > diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
> > index 7d5fe43f85c4..07fdd7a1254a 100644
> > --- a/arch/powerpc/kvm/booke.c
> > +++ b/arch/powerpc/kvm/booke.c
> > @@ -49,15 +49,15 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
> >       VCPU_STAT("inst_emu", emulated_inst_exits),
> >       VCPU_STAT("dec", dec_exits),
> >       VCPU_STAT("ext_intr", ext_intr_exits),
> > -     VCPU_STAT("halt_successful_poll", halt_successful_poll),
> > -     VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> > -     VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> > -     VCPU_STAT("halt_wakeup", halt_wakeup),
> > +     VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> > +     VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> > +     VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> > +     VCPU_STAT_COM("halt_wakeup", halt_wakeup),
> >       VCPU_STAT("doorbell", dbell_exits),
> >       VCPU_STAT("guest doorbell", gdbell_exits),
> > -     VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> > -     VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> > -     VM_STAT("remote_tlb_flush", remote_tlb_flush),
> > +     VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> > +     VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
> > +     VM_STAT_COM("remote_tlb_flush", remote_tlb_flush),
> >       { NULL }
> >   };
> >
> > diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
> > index 8925f3969478..57a20897f3db 100644
> > --- a/arch/s390/include/asm/kvm_host.h
> > +++ b/arch/s390/include/asm/kvm_host.h
> > @@ -361,6 +361,7 @@ struct sie_page {
> >   };
> >
> >   struct kvm_vcpu_stat {
> > +     struct kvm_vcpu_stat_common common;
> >       u64 exit_userspace;
> >       u64 exit_null;
> >       u64 exit_external_request;
> > @@ -370,13 +371,7 @@ struct kvm_vcpu_stat {
> >       u64 exit_validity;
> >       u64 exit_instruction;
> >       u64 exit_pei;
> > -     u64 halt_successful_poll;
> > -     u64 halt_attempted_poll;
> > -     u64 halt_poll_invalid;
> >       u64 halt_no_poll_steal;
> > -     u64 halt_wakeup;
> > -     u64 halt_poll_success_ns;
> > -     u64 halt_poll_fail_ns;
> >       u64 instruction_lctl;
> >       u64 instruction_lctlg;
> >       u64 instruction_stctl;
> > @@ -755,12 +750,12 @@ struct kvm_vcpu_arch {
> >   };
> >
> >   struct kvm_vm_stat {
> > +     struct kvm_vm_stat_common common;
> >       u64 inject_io;
> >       u64 inject_float_mchk;
> >       u64 inject_pfault_done;
> >       u64 inject_service_signal;
> >       u64 inject_virtio;
> > -     u64 remote_tlb_flush;
> >   };
> >
> >   struct kvm_arch_memory_slot {
> > diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> > index 1296fc10f80c..d6bf3372bb10 100644
> > --- a/arch/s390/kvm/kvm-s390.c
> > +++ b/arch/s390/kvm/kvm-s390.c
> > @@ -72,13 +72,13 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
> >       VCPU_STAT("exit_program_interruption", exit_program_interruption),
> >       VCPU_STAT("exit_instr_and_program_int", exit_instr_and_program),
> >       VCPU_STAT("exit_operation_exception", exit_operation_exception),
> > -     VCPU_STAT("halt_successful_poll", halt_successful_poll),
> > -     VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> > -     VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> > +     VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> > +     VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> > +     VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> >       VCPU_STAT("halt_no_poll_steal", halt_no_poll_steal),
> > -     VCPU_STAT("halt_wakeup", halt_wakeup),
> > -     VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> > -     VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> > +     VCPU_STAT_COM("halt_wakeup", halt_wakeup),
> > +     VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> > +     VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
> >       VCPU_STAT("instruction_lctlg", instruction_lctlg),
> >       VCPU_STAT("instruction_lctl", instruction_lctl),
> >       VCPU_STAT("instruction_stctl", instruction_stctl),
> > diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
> > index 55efbacfc244..5bfd6893fbf6 100644
> > --- a/arch/x86/include/asm/kvm_host.h
> > +++ b/arch/x86/include/asm/kvm_host.h
> > @@ -1127,6 +1127,7 @@ struct kvm_arch {
> >   };
> >
> >   struct kvm_vm_stat {
> > +     struct kvm_vm_stat_common common;
> >       ulong mmu_shadow_zapped;
> >       ulong mmu_pte_write;
> >       ulong mmu_pde_zapped;
> > @@ -1134,13 +1135,13 @@ struct kvm_vm_stat {
> >       ulong mmu_recycled;
> >       ulong mmu_cache_miss;
> >       ulong mmu_unsync;
> > -     ulong remote_tlb_flush;
> >       ulong lpages;
> >       ulong nx_lpage_splits;
> >       ulong max_mmu_page_hash_collisions;
> >   };
> >
> >   struct kvm_vcpu_stat {
> > +     struct kvm_vcpu_stat_common common;
> >       u64 pf_fixed;
> >       u64 pf_guest;
> >       u64 tlb_flush;
> > @@ -1154,10 +1155,6 @@ struct kvm_vcpu_stat {
> >       u64 nmi_window_exits;
> >       u64 l1d_flush;
> >       u64 halt_exits;
> > -     u64 halt_successful_poll;
> > -     u64 halt_attempted_poll;
> > -     u64 halt_poll_invalid;
> > -     u64 halt_wakeup;
> >       u64 request_irq_exits;
> >       u64 irq_exits;
> >       u64 host_state_reload;
> > @@ -1168,8 +1165,6 @@ struct kvm_vcpu_stat {
> >       u64 irq_injections;
> >       u64 nmi_injections;
> >       u64 req_event;
> > -     u64 halt_poll_success_ns;
> > -     u64 halt_poll_fail_ns;
> >       u64 nested_run;
> >       u64 directed_yield_attempted;
> >       u64 directed_yield_successful;
> > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> > index 9b6bca616929..9a93d80caff6 100644
> > --- a/arch/x86/kvm/x86.c
> > +++ b/arch/x86/kvm/x86.c
> > @@ -226,10 +226,10 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
> >       VCPU_STAT("irq_window", irq_window_exits),
> >       VCPU_STAT("nmi_window", nmi_window_exits),
> >       VCPU_STAT("halt_exits", halt_exits),
> > -     VCPU_STAT("halt_successful_poll", halt_successful_poll),
> > -     VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> > -     VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> > -     VCPU_STAT("halt_wakeup", halt_wakeup),
> > +     VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> > +     VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> > +     VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> > +     VCPU_STAT_COM("halt_wakeup", halt_wakeup),
> >       VCPU_STAT("hypercalls", hypercalls),
> >       VCPU_STAT("request_irq", request_irq_exits),
> >       VCPU_STAT("irq_exits", irq_exits),
> > @@ -241,8 +241,8 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
> >       VCPU_STAT("nmi_injections", nmi_injections),
> >       VCPU_STAT("req_event", req_event),
> >       VCPU_STAT("l1d_flush", l1d_flush),
> > -     VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> > -     VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> > +     VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> > +     VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
> >       VCPU_STAT("nested_run", nested_run),
> >       VCPU_STAT("directed_yield_attempted", directed_yield_attempted),
> >       VCPU_STAT("directed_yield_successful", directed_yield_successful),
> > @@ -253,7 +253,7 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
> >       VM_STAT("mmu_recycled", mmu_recycled),
> >       VM_STAT("mmu_cache_miss", mmu_cache_miss),
> >       VM_STAT("mmu_unsync", mmu_unsync),
> > -     VM_STAT("remote_tlb_flush", remote_tlb_flush),
> > +     VM_STAT_COM("remote_tlb_flush", remote_tlb_flush),
> >       VM_STAT("largepages", lpages, .mode = 0444),
> >       VM_STAT("nx_largepages_splitted", nx_lpage_splits, .mode = 0444),
> >       VM_STAT("max_mmu_page_hash_collisions", max_mmu_page_hash_collisions),
> > diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> > index 2f34487e21f2..97700e41db3b 100644
> > --- a/include/linux/kvm_host.h
> > +++ b/include/linux/kvm_host.h
> > @@ -1243,10 +1243,15 @@ struct kvm_stats_debugfs_item {
> >   #define KVM_DBGFS_GET_MODE(dbgfs_item)                                         \
> >       ((dbgfs_item)->mode ? (dbgfs_item)->mode : 0644)
> >
> > -#define VM_STAT(n, x, ...)                                                   \
> > +#define VM_STAT(n, x, ...)                                                  \
> >       { n, offsetof(struct kvm, stat.x), KVM_STAT_VM, ## __VA_ARGS__ }
> > -#define VCPU_STAT(n, x, ...)                                                 \
> > +#define VCPU_STAT(n, x, ...)                                                \
> >       { n, offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU, ## __VA_ARGS__ }
> > +#define VM_STAT_COM(n, x, ...)                                                      \
> > +     { n, offsetof(struct kvm, stat.common.x), KVM_STAT_VM, ## __VA_ARGS__ }
> > +#define VCPU_STAT_COM(n, x, ...)                                            \
> > +     { n, offsetof(struct kvm_vcpu, stat.common.x),                         \
> > +       KVM_STAT_VCPU, ## __VA_ARGS__ }
> >
> >   extern struct kvm_stats_debugfs_item debugfs_entries[];
> >   extern struct dentry *kvm_debugfs_dir;
> > diff --git a/include/linux/kvm_types.h b/include/linux/kvm_types.h
> > index a7580f69dda0..87eb05ad678b 100644
> > --- a/include/linux/kvm_types.h
> > +++ b/include/linux/kvm_types.h
> > @@ -76,5 +76,17 @@ struct kvm_mmu_memory_cache {
> >   };
> >   #endif
> >
> > +struct kvm_vm_stat_common {
>
>
> Should this be named as 'kvm_vm_stat_generic' by following the
> convention in kvm_main.c ?  For example, kvm_vm_ioctl_enable_cap()  vs.
> kvm_vm_ioctl_enable_cap_generic().
>
Sure. Thanks.
> > +     ulong remote_tlb_flush;
> > +};
> > +
> > +struct kvm_vcpu_stat_common {
>
>
> Same comment as above.
>
> > +     u64 halt_successful_poll;
> > +     u64 halt_attempted_poll;
> > +     u64 halt_poll_invalid;
> > +     u64 halt_wakeup;
> > +     u64 halt_poll_success_ns;
> > +     u64 halt_poll_fail_ns;
> > +};
> >
> >   #endif /* __KVM_TYPES_H__ */
> > diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> > index 6b4feb92dc79..34a4cf265297 100644
> > --- a/virt/kvm/kvm_main.c
> > +++ b/virt/kvm/kvm_main.c
> > @@ -330,7 +330,7 @@ void kvm_flush_remote_tlbs(struct kvm *kvm)
> >        */
> >       if (!kvm_arch_flush_remote_tlb(kvm)
> >           || kvm_make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
> > -             ++kvm->stat.remote_tlb_flush;
> > +             ++kvm->stat.common.remote_tlb_flush;
> >       cmpxchg(&kvm->tlbs_dirty, dirty_count, 0);
> >   }
> >   EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs);
> > @@ -2940,9 +2940,9 @@ static inline void
> >   update_halt_poll_stats(struct kvm_vcpu *vcpu, u64 poll_ns, bool waited)
> >   {
> >       if (waited)
> > -             vcpu->stat.halt_poll_fail_ns += poll_ns;
> > +             vcpu->stat.common.halt_poll_fail_ns += poll_ns;
> >       else
> > -             vcpu->stat.halt_poll_success_ns += poll_ns;
> > +             vcpu->stat.common.halt_poll_success_ns += poll_ns;
> >   }
> >
> >   /*
> > @@ -2960,16 +2960,16 @@ void kvm_vcpu_block(struct kvm_vcpu *vcpu)
> >       if (vcpu->halt_poll_ns && !kvm_arch_no_poll(vcpu)) {
> >               ktime_t stop = ktime_add_ns(ktime_get(), vcpu->halt_poll_ns);
> >
> > -             ++vcpu->stat.halt_attempted_poll;
> > +             ++vcpu->stat.common.halt_attempted_poll;
> >               do {
> >                       /*
> >                        * This sets KVM_REQ_UNHALT if an interrupt
> >                        * arrives.
> >                        */
> >                       if (kvm_vcpu_check_block(vcpu) < 0) {
> > -                             ++vcpu->stat.halt_successful_poll;
> > +                             ++vcpu->stat.common.halt_successful_poll;
> >                               if (!vcpu_valid_wakeup(vcpu))
> > -                                     ++vcpu->stat.halt_poll_invalid;
> > +                                     ++vcpu->stat.common.halt_poll_invalid;
> >                               goto out;
> >                       }
> >                       poll_end = cur = ktime_get();
> > @@ -3027,7 +3027,7 @@ bool kvm_vcpu_wake_up(struct kvm_vcpu *vcpu)
> >       waitp = kvm_arch_vcpu_get_wait(vcpu);
> >       if (rcuwait_wake_up(waitp)) {
> >               WRITE_ONCE(vcpu->ready, true);
> > -             ++vcpu->stat.halt_wakeup;
> > +             ++vcpu->stat.common.halt_wakeup;
> >               return true;
> >       }
> >
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Re: [PATCH v6 1/4] KVM: stats: Separate common stats from architecture specific ones

[David Matlack]

On Mon, May 24, 2021 at 8:18 AM Jing Zhang <jingzhangos@google.com> wrote:
>
> Put all common statistics in a separate structure to ease
> statistics handling for the incoming new statistics API.
>
> No functional change intended.
>
> Reviewed-by: David Matlack <dmatlack@google.com>

FYI I think you only add Reviewed-by tags if they are offered by the
reviewer explicitly [1]. Offering your Reviewed-by tag is similar to
hitting the +1 button on Gerrit.

But in any case, this patch looks good so here's my tag:

Reviewed-by: David Matlack <dmatlack@google.com>

[1] https://www.kernel.org/doc/html/v4.17/process/submitting-patches.html#reviewer-s-statement-of-oversight

> Reviewed-by: Ricardo Koller <ricarkol@google.com>
> Signed-off-by: Jing Zhang <jingzhangos@google.com>
> ---
>  arch/arm64/include/asm/kvm_host.h   |  9 ++-------
>  arch/arm64/kvm/guest.c              | 12 ++++++------
>  arch/mips/include/asm/kvm_host.h    |  9 ++-------
>  arch/mips/kvm/mips.c                | 12 ++++++------
>  arch/powerpc/include/asm/kvm_host.h |  9 ++-------
>  arch/powerpc/kvm/book3s.c           | 12 ++++++------
>  arch/powerpc/kvm/book3s_hv.c        | 12 ++++++------
>  arch/powerpc/kvm/book3s_pr.c        |  2 +-
>  arch/powerpc/kvm/book3s_pr_papr.c   |  2 +-
>  arch/powerpc/kvm/booke.c            | 14 +++++++-------
>  arch/s390/include/asm/kvm_host.h    |  9 ++-------
>  arch/s390/kvm/kvm-s390.c            | 12 ++++++------
>  arch/x86/include/asm/kvm_host.h     |  9 ++-------
>  arch/x86/kvm/x86.c                  | 14 +++++++-------
>  include/linux/kvm_host.h            |  9 +++++++--
>  include/linux/kvm_types.h           | 12 ++++++++++++
>  virt/kvm/kvm_main.c                 | 14 +++++++-------
>  17 files changed, 82 insertions(+), 90 deletions(-)
>
> diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
> index 7cd7d5c8c4bc..f3ad7a20b0af 100644
> --- a/arch/arm64/include/asm/kvm_host.h
> +++ b/arch/arm64/include/asm/kvm_host.h
> @@ -556,16 +556,11 @@ static inline bool __vcpu_write_sys_reg_to_cpu(u64 val, int reg)
>  }
>
>  struct kvm_vm_stat {
> -       ulong remote_tlb_flush;
> +       struct kvm_vm_stat_common common;
>  };
>
>  struct kvm_vcpu_stat {
> -       u64 halt_successful_poll;
> -       u64 halt_attempted_poll;
> -       u64 halt_poll_success_ns;
> -       u64 halt_poll_fail_ns;
> -       u64 halt_poll_invalid;
> -       u64 halt_wakeup;
> +       struct kvm_vcpu_stat_common common;
>         u64 hvc_exit_stat;
>         u64 wfe_exit_stat;
>         u64 wfi_exit_stat;
> diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
> index 5cb4a1cd5603..0e41331b0911 100644
> --- a/arch/arm64/kvm/guest.c
> +++ b/arch/arm64/kvm/guest.c
> @@ -29,18 +29,18 @@
>  #include "trace.h"
>
>  struct kvm_stats_debugfs_item debugfs_entries[] = {
> -       VCPU_STAT("halt_successful_poll", halt_successful_poll),
> -       VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> -       VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> -       VCPU_STAT("halt_wakeup", halt_wakeup),
> +       VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> +       VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> +       VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> +       VCPU_STAT_COM("halt_wakeup", halt_wakeup),
>         VCPU_STAT("hvc_exit_stat", hvc_exit_stat),
>         VCPU_STAT("wfe_exit_stat", wfe_exit_stat),
>         VCPU_STAT("wfi_exit_stat", wfi_exit_stat),
>         VCPU_STAT("mmio_exit_user", mmio_exit_user),
>         VCPU_STAT("mmio_exit_kernel", mmio_exit_kernel),
>         VCPU_STAT("exits", exits),
> -       VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> -       VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> +       VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> +       VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
>         { NULL }
>  };
>
> diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h
> index fca4547d580f..6f610fbcd8d1 100644
> --- a/arch/mips/include/asm/kvm_host.h
> +++ b/arch/mips/include/asm/kvm_host.h
> @@ -109,10 +109,11 @@ static inline bool kvm_is_error_hva(unsigned long addr)
>  }
>
>  struct kvm_vm_stat {
> -       ulong remote_tlb_flush;
> +       struct kvm_vm_stat_common common;
>  };
>
>  struct kvm_vcpu_stat {
> +       struct kvm_vcpu_stat_common common;
>         u64 wait_exits;
>         u64 cache_exits;
>         u64 signal_exits;
> @@ -142,12 +143,6 @@ struct kvm_vcpu_stat {
>  #ifdef CONFIG_CPU_LOONGSON64
>         u64 vz_cpucfg_exits;
>  #endif
> -       u64 halt_successful_poll;
> -       u64 halt_attempted_poll;
> -       u64 halt_poll_success_ns;
> -       u64 halt_poll_fail_ns;
> -       u64 halt_poll_invalid;
> -       u64 halt_wakeup;
>  };
>
>  struct kvm_arch_memory_slot {
> diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
> index 4d4af97dcc88..f4fc60c05e9c 100644
> --- a/arch/mips/kvm/mips.c
> +++ b/arch/mips/kvm/mips.c
> @@ -68,12 +68,12 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>  #ifdef CONFIG_CPU_LOONGSON64
>         VCPU_STAT("vz_cpucfg", vz_cpucfg_exits),
>  #endif
> -       VCPU_STAT("halt_successful_poll", halt_successful_poll),
> -       VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> -       VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> -       VCPU_STAT("halt_wakeup", halt_wakeup),
> -       VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> -       VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> +       VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> +       VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> +       VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> +       VCPU_STAT_COM("halt_wakeup", halt_wakeup),
> +       VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> +       VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
>         {NULL}
>  };
>
> diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
> index 1e83359f286b..473d9d0804ff 100644
> --- a/arch/powerpc/include/asm/kvm_host.h
> +++ b/arch/powerpc/include/asm/kvm_host.h
> @@ -80,12 +80,13 @@ struct kvmppc_book3s_shadow_vcpu;
>  struct kvm_nested_guest;
>
>  struct kvm_vm_stat {
> -       ulong remote_tlb_flush;
> +       struct kvm_vm_stat_common common;
>         ulong num_2M_pages;
>         ulong num_1G_pages;
>  };
>
>  struct kvm_vcpu_stat {
> +       struct kvm_vcpu_stat_common common;
>         u64 sum_exits;
>         u64 mmio_exits;
>         u64 signal_exits;
> @@ -101,14 +102,8 @@ struct kvm_vcpu_stat {
>         u64 emulated_inst_exits;
>         u64 dec_exits;
>         u64 ext_intr_exits;
> -       u64 halt_poll_success_ns;
> -       u64 halt_poll_fail_ns;
>         u64 halt_wait_ns;
> -       u64 halt_successful_poll;
> -       u64 halt_attempted_poll;
>         u64 halt_successful_wait;
> -       u64 halt_poll_invalid;
> -       u64 halt_wakeup;
>         u64 dbell_exits;
>         u64 gdbell_exits;
>         u64 ld;
> diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
> index 2b691f4d1f26..bd3a10e1fdaf 100644
> --- a/arch/powerpc/kvm/book3s.c
> +++ b/arch/powerpc/kvm/book3s.c
> @@ -47,14 +47,14 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>         VCPU_STAT("dec", dec_exits),
>         VCPU_STAT("ext_intr", ext_intr_exits),
>         VCPU_STAT("queue_intr", queue_intr),
> -       VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> -       VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> +       VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> +       VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
>         VCPU_STAT("halt_wait_ns", halt_wait_ns),
> -       VCPU_STAT("halt_successful_poll", halt_successful_poll),
> -       VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> +       VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> +       VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
>         VCPU_STAT("halt_successful_wait", halt_successful_wait),
> -       VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> -       VCPU_STAT("halt_wakeup", halt_wakeup),
> +       VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> +       VCPU_STAT_COM("halt_wakeup", halt_wakeup),
>         VCPU_STAT("pf_storage", pf_storage),
>         VCPU_STAT("sp_storage", sp_storage),
>         VCPU_STAT("pf_instruc", pf_instruc),
> diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
> index 28a80d240b76..58e187e03c52 100644
> --- a/arch/powerpc/kvm/book3s_hv.c
> +++ b/arch/powerpc/kvm/book3s_hv.c
> @@ -236,7 +236,7 @@ static void kvmppc_fast_vcpu_kick_hv(struct kvm_vcpu *vcpu)
>
>         waitp = kvm_arch_vcpu_get_wait(vcpu);
>         if (rcuwait_wake_up(waitp))
> -               ++vcpu->stat.halt_wakeup;
> +               ++vcpu->stat.common.halt_wakeup;
>
>         cpu = READ_ONCE(vcpu->arch.thread_cpu);
>         if (cpu >= 0 && kvmppc_ipi_thread(cpu))
> @@ -3925,7 +3925,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
>         cur = start_poll = ktime_get();
>         if (vc->halt_poll_ns) {
>                 ktime_t stop = ktime_add_ns(start_poll, vc->halt_poll_ns);
> -               ++vc->runner->stat.halt_attempted_poll;
> +               ++vc->runner->stat.common.halt_attempted_poll;
>
>                 vc->vcore_state = VCORE_POLLING;
>                 spin_unlock(&vc->lock);
> @@ -3942,7 +3942,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
>                 vc->vcore_state = VCORE_INACTIVE;
>
>                 if (!do_sleep) {
> -                       ++vc->runner->stat.halt_successful_poll;
> +                       ++vc->runner->stat.common.halt_successful_poll;
>                         goto out;
>                 }
>         }
> @@ -3954,7 +3954,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
>                 do_sleep = 0;
>                 /* If we polled, count this as a successful poll */
>                 if (vc->halt_poll_ns)
> -                       ++vc->runner->stat.halt_successful_poll;
> +                       ++vc->runner->stat.common.halt_successful_poll;
>                 goto out;
>         }
>
> @@ -3981,13 +3981,13 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
>                         ktime_to_ns(cur) - ktime_to_ns(start_wait);
>                 /* Attribute failed poll time */
>                 if (vc->halt_poll_ns)
> -                       vc->runner->stat.halt_poll_fail_ns +=
> +                       vc->runner->stat.common.halt_poll_fail_ns +=
>                                 ktime_to_ns(start_wait) -
>                                 ktime_to_ns(start_poll);
>         } else {
>                 /* Attribute successful poll time */
>                 if (vc->halt_poll_ns)
> -                       vc->runner->stat.halt_poll_success_ns +=
> +                       vc->runner->stat.common.halt_poll_success_ns +=
>                                 ktime_to_ns(cur) -
>                                 ktime_to_ns(start_poll);
>         }
> diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c
> index d7733b07f489..214caa9d9675 100644
> --- a/arch/powerpc/kvm/book3s_pr.c
> +++ b/arch/powerpc/kvm/book3s_pr.c
> @@ -493,7 +493,7 @@ static void kvmppc_set_msr_pr(struct kvm_vcpu *vcpu, u64 msr)
>                 if (!vcpu->arch.pending_exceptions) {
>                         kvm_vcpu_block(vcpu);
>                         kvm_clear_request(KVM_REQ_UNHALT, vcpu);
> -                       vcpu->stat.halt_wakeup++;
> +                       vcpu->stat.common.halt_wakeup++;
>
>                         /* Unset POW bit after we woke up */
>                         msr &= ~MSR_POW;
> diff --git a/arch/powerpc/kvm/book3s_pr_papr.c b/arch/powerpc/kvm/book3s_pr_papr.c
> index 031c8015864a..9384625c8051 100644
> --- a/arch/powerpc/kvm/book3s_pr_papr.c
> +++ b/arch/powerpc/kvm/book3s_pr_papr.c
> @@ -378,7 +378,7 @@ int kvmppc_h_pr(struct kvm_vcpu *vcpu, unsigned long cmd)
>                 kvmppc_set_msr_fast(vcpu, kvmppc_get_msr(vcpu) | MSR_EE);
>                 kvm_vcpu_block(vcpu);
>                 kvm_clear_request(KVM_REQ_UNHALT, vcpu);
> -               vcpu->stat.halt_wakeup++;
> +               vcpu->stat.common.halt_wakeup++;
>                 return EMULATE_DONE;
>         case H_LOGICAL_CI_LOAD:
>                 return kvmppc_h_pr_logical_ci_load(vcpu);
> diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
> index 7d5fe43f85c4..07fdd7a1254a 100644
> --- a/arch/powerpc/kvm/booke.c
> +++ b/arch/powerpc/kvm/booke.c
> @@ -49,15 +49,15 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>         VCPU_STAT("inst_emu", emulated_inst_exits),
>         VCPU_STAT("dec", dec_exits),
>         VCPU_STAT("ext_intr", ext_intr_exits),
> -       VCPU_STAT("halt_successful_poll", halt_successful_poll),
> -       VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> -       VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> -       VCPU_STAT("halt_wakeup", halt_wakeup),
> +       VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> +       VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> +       VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> +       VCPU_STAT_COM("halt_wakeup", halt_wakeup),
>         VCPU_STAT("doorbell", dbell_exits),
>         VCPU_STAT("guest doorbell", gdbell_exits),
> -       VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> -       VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> -       VM_STAT("remote_tlb_flush", remote_tlb_flush),
> +       VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> +       VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
> +       VM_STAT_COM("remote_tlb_flush", remote_tlb_flush),
>         { NULL }
>  };
>
> diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
> index 8925f3969478..57a20897f3db 100644
> --- a/arch/s390/include/asm/kvm_host.h
> +++ b/arch/s390/include/asm/kvm_host.h
> @@ -361,6 +361,7 @@ struct sie_page {
>  };
>
>  struct kvm_vcpu_stat {
> +       struct kvm_vcpu_stat_common common;
>         u64 exit_userspace;
>         u64 exit_null;
>         u64 exit_external_request;
> @@ -370,13 +371,7 @@ struct kvm_vcpu_stat {
>         u64 exit_validity;
>         u64 exit_instruction;
>         u64 exit_pei;
> -       u64 halt_successful_poll;
> -       u64 halt_attempted_poll;
> -       u64 halt_poll_invalid;
>         u64 halt_no_poll_steal;
> -       u64 halt_wakeup;
> -       u64 halt_poll_success_ns;
> -       u64 halt_poll_fail_ns;
>         u64 instruction_lctl;
>         u64 instruction_lctlg;
>         u64 instruction_stctl;
> @@ -755,12 +750,12 @@ struct kvm_vcpu_arch {
>  };
>
>  struct kvm_vm_stat {
> +       struct kvm_vm_stat_common common;
>         u64 inject_io;
>         u64 inject_float_mchk;
>         u64 inject_pfault_done;
>         u64 inject_service_signal;
>         u64 inject_virtio;
> -       u64 remote_tlb_flush;
>  };
>
>  struct kvm_arch_memory_slot {
> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> index 1296fc10f80c..d6bf3372bb10 100644
> --- a/arch/s390/kvm/kvm-s390.c
> +++ b/arch/s390/kvm/kvm-s390.c
> @@ -72,13 +72,13 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>         VCPU_STAT("exit_program_interruption", exit_program_interruption),
>         VCPU_STAT("exit_instr_and_program_int", exit_instr_and_program),
>         VCPU_STAT("exit_operation_exception", exit_operation_exception),
> -       VCPU_STAT("halt_successful_poll", halt_successful_poll),
> -       VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> -       VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> +       VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> +       VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> +       VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
>         VCPU_STAT("halt_no_poll_steal", halt_no_poll_steal),
> -       VCPU_STAT("halt_wakeup", halt_wakeup),
> -       VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> -       VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> +       VCPU_STAT_COM("halt_wakeup", halt_wakeup),
> +       VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> +       VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
>         VCPU_STAT("instruction_lctlg", instruction_lctlg),
>         VCPU_STAT("instruction_lctl", instruction_lctl),
>         VCPU_STAT("instruction_stctl", instruction_stctl),
> diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
> index 55efbacfc244..5bfd6893fbf6 100644
> --- a/arch/x86/include/asm/kvm_host.h
> +++ b/arch/x86/include/asm/kvm_host.h
> @@ -1127,6 +1127,7 @@ struct kvm_arch {
>  };
>
>  struct kvm_vm_stat {
> +       struct kvm_vm_stat_common common;
>         ulong mmu_shadow_zapped;
>         ulong mmu_pte_write;
>         ulong mmu_pde_zapped;
> @@ -1134,13 +1135,13 @@ struct kvm_vm_stat {
>         ulong mmu_recycled;
>         ulong mmu_cache_miss;
>         ulong mmu_unsync;
> -       ulong remote_tlb_flush;
>         ulong lpages;
>         ulong nx_lpage_splits;
>         ulong max_mmu_page_hash_collisions;
>  };
>
>  struct kvm_vcpu_stat {
> +       struct kvm_vcpu_stat_common common;
>         u64 pf_fixed;
>         u64 pf_guest;
>         u64 tlb_flush;
> @@ -1154,10 +1155,6 @@ struct kvm_vcpu_stat {
>         u64 nmi_window_exits;
>         u64 l1d_flush;
>         u64 halt_exits;
> -       u64 halt_successful_poll;
> -       u64 halt_attempted_poll;
> -       u64 halt_poll_invalid;
> -       u64 halt_wakeup;
>         u64 request_irq_exits;
>         u64 irq_exits;
>         u64 host_state_reload;
> @@ -1168,8 +1165,6 @@ struct kvm_vcpu_stat {
>         u64 irq_injections;
>         u64 nmi_injections;
>         u64 req_event;
> -       u64 halt_poll_success_ns;
> -       u64 halt_poll_fail_ns;
>         u64 nested_run;
>         u64 directed_yield_attempted;
>         u64 directed_yield_successful;
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index 9b6bca616929..9a93d80caff6 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -226,10 +226,10 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>         VCPU_STAT("irq_window", irq_window_exits),
>         VCPU_STAT("nmi_window", nmi_window_exits),
>         VCPU_STAT("halt_exits", halt_exits),
> -       VCPU_STAT("halt_successful_poll", halt_successful_poll),
> -       VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> -       VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> -       VCPU_STAT("halt_wakeup", halt_wakeup),
> +       VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> +       VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> +       VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> +       VCPU_STAT_COM("halt_wakeup", halt_wakeup),
>         VCPU_STAT("hypercalls", hypercalls),
>         VCPU_STAT("request_irq", request_irq_exits),
>         VCPU_STAT("irq_exits", irq_exits),
> @@ -241,8 +241,8 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>         VCPU_STAT("nmi_injections", nmi_injections),
>         VCPU_STAT("req_event", req_event),
>         VCPU_STAT("l1d_flush", l1d_flush),
> -       VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> -       VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> +       VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> +       VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
>         VCPU_STAT("nested_run", nested_run),
>         VCPU_STAT("directed_yield_attempted", directed_yield_attempted),
>         VCPU_STAT("directed_yield_successful", directed_yield_successful),
> @@ -253,7 +253,7 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>         VM_STAT("mmu_recycled", mmu_recycled),
>         VM_STAT("mmu_cache_miss", mmu_cache_miss),
>         VM_STAT("mmu_unsync", mmu_unsync),
> -       VM_STAT("remote_tlb_flush", remote_tlb_flush),
> +       VM_STAT_COM("remote_tlb_flush", remote_tlb_flush),
>         VM_STAT("largepages", lpages, .mode = 0444),
>         VM_STAT("nx_largepages_splitted", nx_lpage_splits, .mode = 0444),
>         VM_STAT("max_mmu_page_hash_collisions", max_mmu_page_hash_collisions),
> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> index 2f34487e21f2..97700e41db3b 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -1243,10 +1243,15 @@ struct kvm_stats_debugfs_item {
>  #define KVM_DBGFS_GET_MODE(dbgfs_item)                                         \
>         ((dbgfs_item)->mode ? (dbgfs_item)->mode : 0644)
>
> -#define VM_STAT(n, x, ...)                                                     \
> +#define VM_STAT(n, x, ...)                                                    \
>         { n, offsetof(struct kvm, stat.x), KVM_STAT_VM, ## __VA_ARGS__ }
> -#define VCPU_STAT(n, x, ...)                                                   \
> +#define VCPU_STAT(n, x, ...)                                                  \
>         { n, offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU, ## __VA_ARGS__ }
> +#define VM_STAT_COM(n, x, ...)                                                \
> +       { n, offsetof(struct kvm, stat.common.x), KVM_STAT_VM, ## __VA_ARGS__ }
> +#define VCPU_STAT_COM(n, x, ...)                                              \
> +       { n, offsetof(struct kvm_vcpu, stat.common.x),                         \
> +         KVM_STAT_VCPU, ## __VA_ARGS__ }
>
>  extern struct kvm_stats_debugfs_item debugfs_entries[];
>  extern struct dentry *kvm_debugfs_dir;
> diff --git a/include/linux/kvm_types.h b/include/linux/kvm_types.h
> index a7580f69dda0..87eb05ad678b 100644
> --- a/include/linux/kvm_types.h
> +++ b/include/linux/kvm_types.h
> @@ -76,5 +76,17 @@ struct kvm_mmu_memory_cache {
>  };
>  #endif
>
> +struct kvm_vm_stat_common {
> +       ulong remote_tlb_flush;
> +};
> +
> +struct kvm_vcpu_stat_common {
> +       u64 halt_successful_poll;
> +       u64 halt_attempted_poll;
> +       u64 halt_poll_invalid;
> +       u64 halt_wakeup;
> +       u64 halt_poll_success_ns;
> +       u64 halt_poll_fail_ns;
> +};
>
>  #endif /* __KVM_TYPES_H__ */
> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> index 6b4feb92dc79..34a4cf265297 100644
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -330,7 +330,7 @@ void kvm_flush_remote_tlbs(struct kvm *kvm)
>          */
>         if (!kvm_arch_flush_remote_tlb(kvm)
>             || kvm_make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
> -               ++kvm->stat.remote_tlb_flush;
> +               ++kvm->stat.common.remote_tlb_flush;
>         cmpxchg(&kvm->tlbs_dirty, dirty_count, 0);
>  }
>  EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs);
> @@ -2940,9 +2940,9 @@ static inline void
>  update_halt_poll_stats(struct kvm_vcpu *vcpu, u64 poll_ns, bool waited)
>  {
>         if (waited)
> -               vcpu->stat.halt_poll_fail_ns += poll_ns;
> +               vcpu->stat.common.halt_poll_fail_ns += poll_ns;
>         else
> -               vcpu->stat.halt_poll_success_ns += poll_ns;
> +               vcpu->stat.common.halt_poll_success_ns += poll_ns;
>  }
>
>  /*
> @@ -2960,16 +2960,16 @@ void kvm_vcpu_block(struct kvm_vcpu *vcpu)
>         if (vcpu->halt_poll_ns && !kvm_arch_no_poll(vcpu)) {
>                 ktime_t stop = ktime_add_ns(ktime_get(), vcpu->halt_poll_ns);
>
> -               ++vcpu->stat.halt_attempted_poll;
> +               ++vcpu->stat.common.halt_attempted_poll;
>                 do {
>                         /*
>                          * This sets KVM_REQ_UNHALT if an interrupt
>                          * arrives.
>                          */
>                         if (kvm_vcpu_check_block(vcpu) < 0) {
> -                               ++vcpu->stat.halt_successful_poll;
> +                               ++vcpu->stat.common.halt_successful_poll;
>                                 if (!vcpu_valid_wakeup(vcpu))
> -                                       ++vcpu->stat.halt_poll_invalid;
> +                                       ++vcpu->stat.common.halt_poll_invalid;
>                                 goto out;
>                         }
>                         poll_end = cur = ktime_get();
> @@ -3027,7 +3027,7 @@ bool kvm_vcpu_wake_up(struct kvm_vcpu *vcpu)
>         waitp = kvm_arch_vcpu_get_wait(vcpu);
>         if (rcuwait_wake_up(waitp)) {
>                 WRITE_ONCE(vcpu->ready, true);
> -               ++vcpu->stat.halt_wakeup;
> +               ++vcpu->stat.common.halt_wakeup;
>                 return true;
>         }
>
> --
> 2.31.1.818.g46aad6cb9e-goog
>

Re: [PATCH v6 1/4] KVM: stats: Separate common stats from architecture specific ones

[David Matlack]

On Mon, May 24, 2021 at 8:18 AM Jing Zhang <jingzhangos@google.com> wrote:
>
> Put all common statistics in a separate structure to ease
> statistics handling for the incoming new statistics API.
>
> No functional change intended.
>
> Reviewed-by: David Matlack <dmatlack@google.com>

FYI I think you only add Reviewed-by tags if they are offered by the
reviewer explicitly [1]. Offering your Reviewed-by tag is similar to
hitting the +1 button on Gerrit.

But in any case, this patch looks good so here's my tag:

Reviewed-by: David Matlack <dmatlack@google.com>

[1] https://www.kernel.org/doc/html/v4.17/process/submitting-patches.html#reviewer-s-statement-of-oversight

> Reviewed-by: Ricardo Koller <ricarkol@google.com>
> Signed-off-by: Jing Zhang <jingzhangos@google.com>
> ---
>  arch/arm64/include/asm/kvm_host.h   |  9 ++-------
>  arch/arm64/kvm/guest.c              | 12 ++++++------
>  arch/mips/include/asm/kvm_host.h    |  9 ++-------
>  arch/mips/kvm/mips.c                | 12 ++++++------
>  arch/powerpc/include/asm/kvm_host.h |  9 ++-------
>  arch/powerpc/kvm/book3s.c           | 12 ++++++------
>  arch/powerpc/kvm/book3s_hv.c        | 12 ++++++------
>  arch/powerpc/kvm/book3s_pr.c        |  2 +-
>  arch/powerpc/kvm/book3s_pr_papr.c   |  2 +-
>  arch/powerpc/kvm/booke.c            | 14 +++++++-------
>  arch/s390/include/asm/kvm_host.h    |  9 ++-------
>  arch/s390/kvm/kvm-s390.c            | 12 ++++++------
>  arch/x86/include/asm/kvm_host.h     |  9 ++-------
>  arch/x86/kvm/x86.c                  | 14 +++++++-------
>  include/linux/kvm_host.h            |  9 +++++++--
>  include/linux/kvm_types.h           | 12 ++++++++++++
>  virt/kvm/kvm_main.c                 | 14 +++++++-------
>  17 files changed, 82 insertions(+), 90 deletions(-)
>
> diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
> index 7cd7d5c8c4bc..f3ad7a20b0af 100644
> --- a/arch/arm64/include/asm/kvm_host.h
> +++ b/arch/arm64/include/asm/kvm_host.h
> @@ -556,16 +556,11 @@ static inline bool __vcpu_write_sys_reg_to_cpu(u64 val, int reg)
>  }
>
>  struct kvm_vm_stat {
> -       ulong remote_tlb_flush;
> +       struct kvm_vm_stat_common common;
>  };
>
>  struct kvm_vcpu_stat {
> -       u64 halt_successful_poll;
> -       u64 halt_attempted_poll;
> -       u64 halt_poll_success_ns;
> -       u64 halt_poll_fail_ns;
> -       u64 halt_poll_invalid;
> -       u64 halt_wakeup;
> +       struct kvm_vcpu_stat_common common;
>         u64 hvc_exit_stat;
>         u64 wfe_exit_stat;
>         u64 wfi_exit_stat;
> diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
> index 5cb4a1cd5603..0e41331b0911 100644
> --- a/arch/arm64/kvm/guest.c
> +++ b/arch/arm64/kvm/guest.c
> @@ -29,18 +29,18 @@
>  #include "trace.h"
>
>  struct kvm_stats_debugfs_item debugfs_entries[] = {
> -       VCPU_STAT("halt_successful_poll", halt_successful_poll),
> -       VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> -       VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> -       VCPU_STAT("halt_wakeup", halt_wakeup),
> +       VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> +       VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> +       VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> +       VCPU_STAT_COM("halt_wakeup", halt_wakeup),
>         VCPU_STAT("hvc_exit_stat", hvc_exit_stat),
>         VCPU_STAT("wfe_exit_stat", wfe_exit_stat),
>         VCPU_STAT("wfi_exit_stat", wfi_exit_stat),
>         VCPU_STAT("mmio_exit_user", mmio_exit_user),
>         VCPU_STAT("mmio_exit_kernel", mmio_exit_kernel),
>         VCPU_STAT("exits", exits),
> -       VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> -       VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> +       VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> +       VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
>         { NULL }
>  };
>
> diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h
> index fca4547d580f..6f610fbcd8d1 100644
> --- a/arch/mips/include/asm/kvm_host.h
> +++ b/arch/mips/include/asm/kvm_host.h
> @@ -109,10 +109,11 @@ static inline bool kvm_is_error_hva(unsigned long addr)
>  }
>
>  struct kvm_vm_stat {
> -       ulong remote_tlb_flush;
> +       struct kvm_vm_stat_common common;
>  };
>
>  struct kvm_vcpu_stat {
> +       struct kvm_vcpu_stat_common common;
>         u64 wait_exits;
>         u64 cache_exits;
>         u64 signal_exits;
> @@ -142,12 +143,6 @@ struct kvm_vcpu_stat {
>  #ifdef CONFIG_CPU_LOONGSON64
>         u64 vz_cpucfg_exits;
>  #endif
> -       u64 halt_successful_poll;
> -       u64 halt_attempted_poll;
> -       u64 halt_poll_success_ns;
> -       u64 halt_poll_fail_ns;
> -       u64 halt_poll_invalid;
> -       u64 halt_wakeup;
>  };
>
>  struct kvm_arch_memory_slot {
> diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
> index 4d4af97dcc88..f4fc60c05e9c 100644
> --- a/arch/mips/kvm/mips.c
> +++ b/arch/mips/kvm/mips.c
> @@ -68,12 +68,12 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>  #ifdef CONFIG_CPU_LOONGSON64
>         VCPU_STAT("vz_cpucfg", vz_cpucfg_exits),
>  #endif
> -       VCPU_STAT("halt_successful_poll", halt_successful_poll),
> -       VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> -       VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> -       VCPU_STAT("halt_wakeup", halt_wakeup),
> -       VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> -       VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> +       VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> +       VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> +       VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> +       VCPU_STAT_COM("halt_wakeup", halt_wakeup),
> +       VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> +       VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
>         {NULL}
>  };
>
> diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
> index 1e83359f286b..473d9d0804ff 100644
> --- a/arch/powerpc/include/asm/kvm_host.h
> +++ b/arch/powerpc/include/asm/kvm_host.h
> @@ -80,12 +80,13 @@ struct kvmppc_book3s_shadow_vcpu;
>  struct kvm_nested_guest;
>
>  struct kvm_vm_stat {
> -       ulong remote_tlb_flush;
> +       struct kvm_vm_stat_common common;
>         ulong num_2M_pages;
>         ulong num_1G_pages;
>  };
>
>  struct kvm_vcpu_stat {
> +       struct kvm_vcpu_stat_common common;
>         u64 sum_exits;
>         u64 mmio_exits;
>         u64 signal_exits;
> @@ -101,14 +102,8 @@ struct kvm_vcpu_stat {
>         u64 emulated_inst_exits;
>         u64 dec_exits;
>         u64 ext_intr_exits;
> -       u64 halt_poll_success_ns;
> -       u64 halt_poll_fail_ns;
>         u64 halt_wait_ns;
> -       u64 halt_successful_poll;
> -       u64 halt_attempted_poll;
>         u64 halt_successful_wait;
> -       u64 halt_poll_invalid;
> -       u64 halt_wakeup;
>         u64 dbell_exits;
>         u64 gdbell_exits;
>         u64 ld;
> diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
> index 2b691f4d1f26..bd3a10e1fdaf 100644
> --- a/arch/powerpc/kvm/book3s.c
> +++ b/arch/powerpc/kvm/book3s.c
> @@ -47,14 +47,14 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>         VCPU_STAT("dec", dec_exits),
>         VCPU_STAT("ext_intr", ext_intr_exits),
>         VCPU_STAT("queue_intr", queue_intr),
> -       VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> -       VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> +       VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> +       VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
>         VCPU_STAT("halt_wait_ns", halt_wait_ns),
> -       VCPU_STAT("halt_successful_poll", halt_successful_poll),
> -       VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> +       VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> +       VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
>         VCPU_STAT("halt_successful_wait", halt_successful_wait),
> -       VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> -       VCPU_STAT("halt_wakeup", halt_wakeup),
> +       VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> +       VCPU_STAT_COM("halt_wakeup", halt_wakeup),
>         VCPU_STAT("pf_storage", pf_storage),
>         VCPU_STAT("sp_storage", sp_storage),
>         VCPU_STAT("pf_instruc", pf_instruc),
> diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
> index 28a80d240b76..58e187e03c52 100644
> --- a/arch/powerpc/kvm/book3s_hv.c
> +++ b/arch/powerpc/kvm/book3s_hv.c
> @@ -236,7 +236,7 @@ static void kvmppc_fast_vcpu_kick_hv(struct kvm_vcpu *vcpu)
>
>         waitp = kvm_arch_vcpu_get_wait(vcpu);
>         if (rcuwait_wake_up(waitp))
> -               ++vcpu->stat.halt_wakeup;
> +               ++vcpu->stat.common.halt_wakeup;
>
>         cpu = READ_ONCE(vcpu->arch.thread_cpu);
>         if (cpu >= 0 && kvmppc_ipi_thread(cpu))
> @@ -3925,7 +3925,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
>         cur = start_poll = ktime_get();
>         if (vc->halt_poll_ns) {
>                 ktime_t stop = ktime_add_ns(start_poll, vc->halt_poll_ns);
> -               ++vc->runner->stat.halt_attempted_poll;
> +               ++vc->runner->stat.common.halt_attempted_poll;
>
>                 vc->vcore_state = VCORE_POLLING;
>                 spin_unlock(&vc->lock);
> @@ -3942,7 +3942,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
>                 vc->vcore_state = VCORE_INACTIVE;
>
>                 if (!do_sleep) {
> -                       ++vc->runner->stat.halt_successful_poll;
> +                       ++vc->runner->stat.common.halt_successful_poll;
>                         goto out;
>                 }
>         }
> @@ -3954,7 +3954,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
>                 do_sleep = 0;
>                 /* If we polled, count this as a successful poll */
>                 if (vc->halt_poll_ns)
> -                       ++vc->runner->stat.halt_successful_poll;
> +                       ++vc->runner->stat.common.halt_successful_poll;
>                 goto out;
>         }
>
> @@ -3981,13 +3981,13 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
>                         ktime_to_ns(cur) - ktime_to_ns(start_wait);
>                 /* Attribute failed poll time */
>                 if (vc->halt_poll_ns)
> -                       vc->runner->stat.halt_poll_fail_ns +> +                       vc->runner->stat.common.halt_poll_fail_ns +>                                 ktime_to_ns(start_wait) -
>                                 ktime_to_ns(start_poll);
>         } else {
>                 /* Attribute successful poll time */
>                 if (vc->halt_poll_ns)
> -                       vc->runner->stat.halt_poll_success_ns +> +                       vc->runner->stat.common.halt_poll_success_ns +>                                 ktime_to_ns(cur) -
>                                 ktime_to_ns(start_poll);
>         }
> diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c
> index d7733b07f489..214caa9d9675 100644
> --- a/arch/powerpc/kvm/book3s_pr.c
> +++ b/arch/powerpc/kvm/book3s_pr.c
> @@ -493,7 +493,7 @@ static void kvmppc_set_msr_pr(struct kvm_vcpu *vcpu, u64 msr)
>                 if (!vcpu->arch.pending_exceptions) {
>                         kvm_vcpu_block(vcpu);
>                         kvm_clear_request(KVM_REQ_UNHALT, vcpu);
> -                       vcpu->stat.halt_wakeup++;
> +                       vcpu->stat.common.halt_wakeup++;
>
>                         /* Unset POW bit after we woke up */
>                         msr &= ~MSR_POW;
> diff --git a/arch/powerpc/kvm/book3s_pr_papr.c b/arch/powerpc/kvm/book3s_pr_papr.c
> index 031c8015864a..9384625c8051 100644
> --- a/arch/powerpc/kvm/book3s_pr_papr.c
> +++ b/arch/powerpc/kvm/book3s_pr_papr.c
> @@ -378,7 +378,7 @@ int kvmppc_h_pr(struct kvm_vcpu *vcpu, unsigned long cmd)
>                 kvmppc_set_msr_fast(vcpu, kvmppc_get_msr(vcpu) | MSR_EE);
>                 kvm_vcpu_block(vcpu);
>                 kvm_clear_request(KVM_REQ_UNHALT, vcpu);
> -               vcpu->stat.halt_wakeup++;
> +               vcpu->stat.common.halt_wakeup++;
>                 return EMULATE_DONE;
>         case H_LOGICAL_CI_LOAD:
>                 return kvmppc_h_pr_logical_ci_load(vcpu);
> diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
> index 7d5fe43f85c4..07fdd7a1254a 100644
> --- a/arch/powerpc/kvm/booke.c
> +++ b/arch/powerpc/kvm/booke.c
> @@ -49,15 +49,15 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>         VCPU_STAT("inst_emu", emulated_inst_exits),
>         VCPU_STAT("dec", dec_exits),
>         VCPU_STAT("ext_intr", ext_intr_exits),
> -       VCPU_STAT("halt_successful_poll", halt_successful_poll),
> -       VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> -       VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> -       VCPU_STAT("halt_wakeup", halt_wakeup),
> +       VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> +       VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> +       VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> +       VCPU_STAT_COM("halt_wakeup", halt_wakeup),
>         VCPU_STAT("doorbell", dbell_exits),
>         VCPU_STAT("guest doorbell", gdbell_exits),
> -       VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> -       VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> -       VM_STAT("remote_tlb_flush", remote_tlb_flush),
> +       VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> +       VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
> +       VM_STAT_COM("remote_tlb_flush", remote_tlb_flush),
>         { NULL }
>  };
>
> diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
> index 8925f3969478..57a20897f3db 100644
> --- a/arch/s390/include/asm/kvm_host.h
> +++ b/arch/s390/include/asm/kvm_host.h
> @@ -361,6 +361,7 @@ struct sie_page {
>  };
>
>  struct kvm_vcpu_stat {
> +       struct kvm_vcpu_stat_common common;
>         u64 exit_userspace;
>         u64 exit_null;
>         u64 exit_external_request;
> @@ -370,13 +371,7 @@ struct kvm_vcpu_stat {
>         u64 exit_validity;
>         u64 exit_instruction;
>         u64 exit_pei;
> -       u64 halt_successful_poll;
> -       u64 halt_attempted_poll;
> -       u64 halt_poll_invalid;
>         u64 halt_no_poll_steal;
> -       u64 halt_wakeup;
> -       u64 halt_poll_success_ns;
> -       u64 halt_poll_fail_ns;
>         u64 instruction_lctl;
>         u64 instruction_lctlg;
>         u64 instruction_stctl;
> @@ -755,12 +750,12 @@ struct kvm_vcpu_arch {
>  };
>
>  struct kvm_vm_stat {
> +       struct kvm_vm_stat_common common;
>         u64 inject_io;
>         u64 inject_float_mchk;
>         u64 inject_pfault_done;
>         u64 inject_service_signal;
>         u64 inject_virtio;
> -       u64 remote_tlb_flush;
>  };
>
>  struct kvm_arch_memory_slot {
> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> index 1296fc10f80c..d6bf3372bb10 100644
> --- a/arch/s390/kvm/kvm-s390.c
> +++ b/arch/s390/kvm/kvm-s390.c
> @@ -72,13 +72,13 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>         VCPU_STAT("exit_program_interruption", exit_program_interruption),
>         VCPU_STAT("exit_instr_and_program_int", exit_instr_and_program),
>         VCPU_STAT("exit_operation_exception", exit_operation_exception),
> -       VCPU_STAT("halt_successful_poll", halt_successful_poll),
> -       VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> -       VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> +       VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> +       VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> +       VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
>         VCPU_STAT("halt_no_poll_steal", halt_no_poll_steal),
> -       VCPU_STAT("halt_wakeup", halt_wakeup),
> -       VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> -       VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> +       VCPU_STAT_COM("halt_wakeup", halt_wakeup),
> +       VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> +       VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
>         VCPU_STAT("instruction_lctlg", instruction_lctlg),
>         VCPU_STAT("instruction_lctl", instruction_lctl),
>         VCPU_STAT("instruction_stctl", instruction_stctl),
> diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
> index 55efbacfc244..5bfd6893fbf6 100644
> --- a/arch/x86/include/asm/kvm_host.h
> +++ b/arch/x86/include/asm/kvm_host.h
> @@ -1127,6 +1127,7 @@ struct kvm_arch {
>  };
>
>  struct kvm_vm_stat {
> +       struct kvm_vm_stat_common common;
>         ulong mmu_shadow_zapped;
>         ulong mmu_pte_write;
>         ulong mmu_pde_zapped;
> @@ -1134,13 +1135,13 @@ struct kvm_vm_stat {
>         ulong mmu_recycled;
>         ulong mmu_cache_miss;
>         ulong mmu_unsync;
> -       ulong remote_tlb_flush;
>         ulong lpages;
>         ulong nx_lpage_splits;
>         ulong max_mmu_page_hash_collisions;
>  };
>
>  struct kvm_vcpu_stat {
> +       struct kvm_vcpu_stat_common common;
>         u64 pf_fixed;
>         u64 pf_guest;
>         u64 tlb_flush;
> @@ -1154,10 +1155,6 @@ struct kvm_vcpu_stat {
>         u64 nmi_window_exits;
>         u64 l1d_flush;
>         u64 halt_exits;
> -       u64 halt_successful_poll;
> -       u64 halt_attempted_poll;
> -       u64 halt_poll_invalid;
> -       u64 halt_wakeup;
>         u64 request_irq_exits;
>         u64 irq_exits;
>         u64 host_state_reload;
> @@ -1168,8 +1165,6 @@ struct kvm_vcpu_stat {
>         u64 irq_injections;
>         u64 nmi_injections;
>         u64 req_event;
> -       u64 halt_poll_success_ns;
> -       u64 halt_poll_fail_ns;
>         u64 nested_run;
>         u64 directed_yield_attempted;
>         u64 directed_yield_successful;
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index 9b6bca616929..9a93d80caff6 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -226,10 +226,10 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>         VCPU_STAT("irq_window", irq_window_exits),
>         VCPU_STAT("nmi_window", nmi_window_exits),
>         VCPU_STAT("halt_exits", halt_exits),
> -       VCPU_STAT("halt_successful_poll", halt_successful_poll),
> -       VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> -       VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> -       VCPU_STAT("halt_wakeup", halt_wakeup),
> +       VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> +       VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> +       VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> +       VCPU_STAT_COM("halt_wakeup", halt_wakeup),
>         VCPU_STAT("hypercalls", hypercalls),
>         VCPU_STAT("request_irq", request_irq_exits),
>         VCPU_STAT("irq_exits", irq_exits),
> @@ -241,8 +241,8 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>         VCPU_STAT("nmi_injections", nmi_injections),
>         VCPU_STAT("req_event", req_event),
>         VCPU_STAT("l1d_flush", l1d_flush),
> -       VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> -       VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> +       VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> +       VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
>         VCPU_STAT("nested_run", nested_run),
>         VCPU_STAT("directed_yield_attempted", directed_yield_attempted),
>         VCPU_STAT("directed_yield_successful", directed_yield_successful),
> @@ -253,7 +253,7 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>         VM_STAT("mmu_recycled", mmu_recycled),
>         VM_STAT("mmu_cache_miss", mmu_cache_miss),
>         VM_STAT("mmu_unsync", mmu_unsync),
> -       VM_STAT("remote_tlb_flush", remote_tlb_flush),
> +       VM_STAT_COM("remote_tlb_flush", remote_tlb_flush),
>         VM_STAT("largepages", lpages, .mode = 0444),
>         VM_STAT("nx_largepages_splitted", nx_lpage_splits, .mode = 0444),
>         VM_STAT("max_mmu_page_hash_collisions", max_mmu_page_hash_collisions),
> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> index 2f34487e21f2..97700e41db3b 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -1243,10 +1243,15 @@ struct kvm_stats_debugfs_item {
>  #define KVM_DBGFS_GET_MODE(dbgfs_item)                                         \
>         ((dbgfs_item)->mode ? (dbgfs_item)->mode : 0644)
>
> -#define VM_STAT(n, x, ...)                                                     \
> +#define VM_STAT(n, x, ...)                                                    \
>         { n, offsetof(struct kvm, stat.x), KVM_STAT_VM, ## __VA_ARGS__ }
> -#define VCPU_STAT(n, x, ...)                                                   \
> +#define VCPU_STAT(n, x, ...)                                                  \
>         { n, offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU, ## __VA_ARGS__ }
> +#define VM_STAT_COM(n, x, ...)                                                \
> +       { n, offsetof(struct kvm, stat.common.x), KVM_STAT_VM, ## __VA_ARGS__ }
> +#define VCPU_STAT_COM(n, x, ...)                                              \
> +       { n, offsetof(struct kvm_vcpu, stat.common.x),                         \
> +         KVM_STAT_VCPU, ## __VA_ARGS__ }
>
>  extern struct kvm_stats_debugfs_item debugfs_entries[];
>  extern struct dentry *kvm_debugfs_dir;
> diff --git a/include/linux/kvm_types.h b/include/linux/kvm_types.h
> index a7580f69dda0..87eb05ad678b 100644
> --- a/include/linux/kvm_types.h
> +++ b/include/linux/kvm_types.h
> @@ -76,5 +76,17 @@ struct kvm_mmu_memory_cache {
>  };
>  #endif
>
> +struct kvm_vm_stat_common {
> +       ulong remote_tlb_flush;
> +};
> +
> +struct kvm_vcpu_stat_common {
> +       u64 halt_successful_poll;
> +       u64 halt_attempted_poll;
> +       u64 halt_poll_invalid;
> +       u64 halt_wakeup;
> +       u64 halt_poll_success_ns;
> +       u64 halt_poll_fail_ns;
> +};
>
>  #endif /* __KVM_TYPES_H__ */
> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> index 6b4feb92dc79..34a4cf265297 100644
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -330,7 +330,7 @@ void kvm_flush_remote_tlbs(struct kvm *kvm)
>          */
>         if (!kvm_arch_flush_remote_tlb(kvm)
>             || kvm_make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
> -               ++kvm->stat.remote_tlb_flush;
> +               ++kvm->stat.common.remote_tlb_flush;
>         cmpxchg(&kvm->tlbs_dirty, dirty_count, 0);
>  }
>  EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs);
> @@ -2940,9 +2940,9 @@ static inline void
>  update_halt_poll_stats(struct kvm_vcpu *vcpu, u64 poll_ns, bool waited)
>  {
>         if (waited)
> -               vcpu->stat.halt_poll_fail_ns += poll_ns;
> +               vcpu->stat.common.halt_poll_fail_ns += poll_ns;
>         else
> -               vcpu->stat.halt_poll_success_ns += poll_ns;
> +               vcpu->stat.common.halt_poll_success_ns += poll_ns;
>  }
>
>  /*
> @@ -2960,16 +2960,16 @@ void kvm_vcpu_block(struct kvm_vcpu *vcpu)
>         if (vcpu->halt_poll_ns && !kvm_arch_no_poll(vcpu)) {
>                 ktime_t stop = ktime_add_ns(ktime_get(), vcpu->halt_poll_ns);
>
> -               ++vcpu->stat.halt_attempted_poll;
> +               ++vcpu->stat.common.halt_attempted_poll;
>                 do {
>                         /*
>                          * This sets KVM_REQ_UNHALT if an interrupt
>                          * arrives.
>                          */
>                         if (kvm_vcpu_check_block(vcpu) < 0) {
> -                               ++vcpu->stat.halt_successful_poll;
> +                               ++vcpu->stat.common.halt_successful_poll;
>                                 if (!vcpu_valid_wakeup(vcpu))
> -                                       ++vcpu->stat.halt_poll_invalid;
> +                                       ++vcpu->stat.common.halt_poll_invalid;
>                                 goto out;
>                         }
>                         poll_end = cur = ktime_get();
> @@ -3027,7 +3027,7 @@ bool kvm_vcpu_wake_up(struct kvm_vcpu *vcpu)
>         waitp = kvm_arch_vcpu_get_wait(vcpu);
>         if (rcuwait_wake_up(waitp)) {
>                 WRITE_ONCE(vcpu->ready, true);
> -               ++vcpu->stat.halt_wakeup;
> +               ++vcpu->stat.common.halt_wakeup;
>                 return true;
>         }
>
> --
> 2.31.1.818.g46aad6cb9e-goog
>

Re: [PATCH v6 1/4] KVM: stats: Separate common stats from architecture specific ones

[David Matlack]

On Mon, May 24, 2021 at 8:18 AM Jing Zhang <jingzhangos@google.com> wrote:
>
> Put all common statistics in a separate structure to ease
> statistics handling for the incoming new statistics API.
>
> No functional change intended.
>
> Reviewed-by: David Matlack <dmatlack@google.com>

FYI I think you only add Reviewed-by tags if they are offered by the
reviewer explicitly [1]. Offering your Reviewed-by tag is similar to
hitting the +1 button on Gerrit.

But in any case, this patch looks good so here's my tag:

Reviewed-by: David Matlack <dmatlack@google.com>

[1] https://www.kernel.org/doc/html/v4.17/process/submitting-patches.html#reviewer-s-statement-of-oversight

> Reviewed-by: Ricardo Koller <ricarkol@google.com>
> Signed-off-by: Jing Zhang <jingzhangos@google.com>
> ---
>  arch/arm64/include/asm/kvm_host.h   |  9 ++-------
>  arch/arm64/kvm/guest.c              | 12 ++++++------
>  arch/mips/include/asm/kvm_host.h    |  9 ++-------
>  arch/mips/kvm/mips.c                | 12 ++++++------
>  arch/powerpc/include/asm/kvm_host.h |  9 ++-------
>  arch/powerpc/kvm/book3s.c           | 12 ++++++------
>  arch/powerpc/kvm/book3s_hv.c        | 12 ++++++------
>  arch/powerpc/kvm/book3s_pr.c        |  2 +-
>  arch/powerpc/kvm/book3s_pr_papr.c   |  2 +-
>  arch/powerpc/kvm/booke.c            | 14 +++++++-------
>  arch/s390/include/asm/kvm_host.h    |  9 ++-------
>  arch/s390/kvm/kvm-s390.c            | 12 ++++++------
>  arch/x86/include/asm/kvm_host.h     |  9 ++-------
>  arch/x86/kvm/x86.c                  | 14 +++++++-------
>  include/linux/kvm_host.h            |  9 +++++++--
>  include/linux/kvm_types.h           | 12 ++++++++++++
>  virt/kvm/kvm_main.c                 | 14 +++++++-------
>  17 files changed, 82 insertions(+), 90 deletions(-)
>
> diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
> index 7cd7d5c8c4bc..f3ad7a20b0af 100644
> --- a/arch/arm64/include/asm/kvm_host.h
> +++ b/arch/arm64/include/asm/kvm_host.h
> @@ -556,16 +556,11 @@ static inline bool __vcpu_write_sys_reg_to_cpu(u64 val, int reg)
>  }
>
>  struct kvm_vm_stat {
> -       ulong remote_tlb_flush;
> +       struct kvm_vm_stat_common common;
>  };
>
>  struct kvm_vcpu_stat {
> -       u64 halt_successful_poll;
> -       u64 halt_attempted_poll;
> -       u64 halt_poll_success_ns;
> -       u64 halt_poll_fail_ns;
> -       u64 halt_poll_invalid;
> -       u64 halt_wakeup;
> +       struct kvm_vcpu_stat_common common;
>         u64 hvc_exit_stat;
>         u64 wfe_exit_stat;
>         u64 wfi_exit_stat;
> diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
> index 5cb4a1cd5603..0e41331b0911 100644
> --- a/arch/arm64/kvm/guest.c
> +++ b/arch/arm64/kvm/guest.c
> @@ -29,18 +29,18 @@
>  #include "trace.h"
>
>  struct kvm_stats_debugfs_item debugfs_entries[] = {
> -       VCPU_STAT("halt_successful_poll", halt_successful_poll),
> -       VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> -       VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> -       VCPU_STAT("halt_wakeup", halt_wakeup),
> +       VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> +       VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> +       VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> +       VCPU_STAT_COM("halt_wakeup", halt_wakeup),
>         VCPU_STAT("hvc_exit_stat", hvc_exit_stat),
>         VCPU_STAT("wfe_exit_stat", wfe_exit_stat),
>         VCPU_STAT("wfi_exit_stat", wfi_exit_stat),
>         VCPU_STAT("mmio_exit_user", mmio_exit_user),
>         VCPU_STAT("mmio_exit_kernel", mmio_exit_kernel),
>         VCPU_STAT("exits", exits),
> -       VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> -       VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> +       VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> +       VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
>         { NULL }
>  };
>
> diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h
> index fca4547d580f..6f610fbcd8d1 100644
> --- a/arch/mips/include/asm/kvm_host.h
> +++ b/arch/mips/include/asm/kvm_host.h
> @@ -109,10 +109,11 @@ static inline bool kvm_is_error_hva(unsigned long addr)
>  }
>
>  struct kvm_vm_stat {
> -       ulong remote_tlb_flush;
> +       struct kvm_vm_stat_common common;
>  };
>
>  struct kvm_vcpu_stat {
> +       struct kvm_vcpu_stat_common common;
>         u64 wait_exits;
>         u64 cache_exits;
>         u64 signal_exits;
> @@ -142,12 +143,6 @@ struct kvm_vcpu_stat {
>  #ifdef CONFIG_CPU_LOONGSON64
>         u64 vz_cpucfg_exits;
>  #endif
> -       u64 halt_successful_poll;
> -       u64 halt_attempted_poll;
> -       u64 halt_poll_success_ns;
> -       u64 halt_poll_fail_ns;
> -       u64 halt_poll_invalid;
> -       u64 halt_wakeup;
>  };
>
>  struct kvm_arch_memory_slot {
> diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
> index 4d4af97dcc88..f4fc60c05e9c 100644
> --- a/arch/mips/kvm/mips.c
> +++ b/arch/mips/kvm/mips.c
> @@ -68,12 +68,12 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>  #ifdef CONFIG_CPU_LOONGSON64
>         VCPU_STAT("vz_cpucfg", vz_cpucfg_exits),
>  #endif
> -       VCPU_STAT("halt_successful_poll", halt_successful_poll),
> -       VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> -       VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> -       VCPU_STAT("halt_wakeup", halt_wakeup),
> -       VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> -       VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> +       VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> +       VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> +       VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> +       VCPU_STAT_COM("halt_wakeup", halt_wakeup),
> +       VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> +       VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
>         {NULL}
>  };
>
> diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
> index 1e83359f286b..473d9d0804ff 100644
> --- a/arch/powerpc/include/asm/kvm_host.h
> +++ b/arch/powerpc/include/asm/kvm_host.h
> @@ -80,12 +80,13 @@ struct kvmppc_book3s_shadow_vcpu;
>  struct kvm_nested_guest;
>
>  struct kvm_vm_stat {
> -       ulong remote_tlb_flush;
> +       struct kvm_vm_stat_common common;
>         ulong num_2M_pages;
>         ulong num_1G_pages;
>  };
>
>  struct kvm_vcpu_stat {
> +       struct kvm_vcpu_stat_common common;
>         u64 sum_exits;
>         u64 mmio_exits;
>         u64 signal_exits;
> @@ -101,14 +102,8 @@ struct kvm_vcpu_stat {
>         u64 emulated_inst_exits;
>         u64 dec_exits;
>         u64 ext_intr_exits;
> -       u64 halt_poll_success_ns;
> -       u64 halt_poll_fail_ns;
>         u64 halt_wait_ns;
> -       u64 halt_successful_poll;
> -       u64 halt_attempted_poll;
>         u64 halt_successful_wait;
> -       u64 halt_poll_invalid;
> -       u64 halt_wakeup;
>         u64 dbell_exits;
>         u64 gdbell_exits;
>         u64 ld;
> diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
> index 2b691f4d1f26..bd3a10e1fdaf 100644
> --- a/arch/powerpc/kvm/book3s.c
> +++ b/arch/powerpc/kvm/book3s.c
> @@ -47,14 +47,14 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>         VCPU_STAT("dec", dec_exits),
>         VCPU_STAT("ext_intr", ext_intr_exits),
>         VCPU_STAT("queue_intr", queue_intr),
> -       VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> -       VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> +       VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> +       VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
>         VCPU_STAT("halt_wait_ns", halt_wait_ns),
> -       VCPU_STAT("halt_successful_poll", halt_successful_poll),
> -       VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> +       VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> +       VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
>         VCPU_STAT("halt_successful_wait", halt_successful_wait),
> -       VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> -       VCPU_STAT("halt_wakeup", halt_wakeup),
> +       VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> +       VCPU_STAT_COM("halt_wakeup", halt_wakeup),
>         VCPU_STAT("pf_storage", pf_storage),
>         VCPU_STAT("sp_storage", sp_storage),
>         VCPU_STAT("pf_instruc", pf_instruc),
> diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
> index 28a80d240b76..58e187e03c52 100644
> --- a/arch/powerpc/kvm/book3s_hv.c
> +++ b/arch/powerpc/kvm/book3s_hv.c
> @@ -236,7 +236,7 @@ static void kvmppc_fast_vcpu_kick_hv(struct kvm_vcpu *vcpu)
>
>         waitp = kvm_arch_vcpu_get_wait(vcpu);
>         if (rcuwait_wake_up(waitp))
> -               ++vcpu->stat.halt_wakeup;
> +               ++vcpu->stat.common.halt_wakeup;
>
>         cpu = READ_ONCE(vcpu->arch.thread_cpu);
>         if (cpu >= 0 && kvmppc_ipi_thread(cpu))
> @@ -3925,7 +3925,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
>         cur = start_poll = ktime_get();
>         if (vc->halt_poll_ns) {
>                 ktime_t stop = ktime_add_ns(start_poll, vc->halt_poll_ns);
> -               ++vc->runner->stat.halt_attempted_poll;
> +               ++vc->runner->stat.common.halt_attempted_poll;
>
>                 vc->vcore_state = VCORE_POLLING;
>                 spin_unlock(&vc->lock);
> @@ -3942,7 +3942,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
>                 vc->vcore_state = VCORE_INACTIVE;
>
>                 if (!do_sleep) {
> -                       ++vc->runner->stat.halt_successful_poll;
> +                       ++vc->runner->stat.common.halt_successful_poll;
>                         goto out;
>                 }
>         }
> @@ -3954,7 +3954,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
>                 do_sleep = 0;
>                 /* If we polled, count this as a successful poll */
>                 if (vc->halt_poll_ns)
> -                       ++vc->runner->stat.halt_successful_poll;
> +                       ++vc->runner->stat.common.halt_successful_poll;
>                 goto out;
>         }
>
> @@ -3981,13 +3981,13 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
>                         ktime_to_ns(cur) - ktime_to_ns(start_wait);
>                 /* Attribute failed poll time */
>                 if (vc->halt_poll_ns)
> -                       vc->runner->stat.halt_poll_fail_ns +=
> +                       vc->runner->stat.common.halt_poll_fail_ns +=
>                                 ktime_to_ns(start_wait) -
>                                 ktime_to_ns(start_poll);
>         } else {
>                 /* Attribute successful poll time */
>                 if (vc->halt_poll_ns)
> -                       vc->runner->stat.halt_poll_success_ns +=
> +                       vc->runner->stat.common.halt_poll_success_ns +=
>                                 ktime_to_ns(cur) -
>                                 ktime_to_ns(start_poll);
>         }
> diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c
> index d7733b07f489..214caa9d9675 100644
> --- a/arch/powerpc/kvm/book3s_pr.c
> +++ b/arch/powerpc/kvm/book3s_pr.c
> @@ -493,7 +493,7 @@ static void kvmppc_set_msr_pr(struct kvm_vcpu *vcpu, u64 msr)
>                 if (!vcpu->arch.pending_exceptions) {
>                         kvm_vcpu_block(vcpu);
>                         kvm_clear_request(KVM_REQ_UNHALT, vcpu);
> -                       vcpu->stat.halt_wakeup++;
> +                       vcpu->stat.common.halt_wakeup++;
>
>                         /* Unset POW bit after we woke up */
>                         msr &= ~MSR_POW;
> diff --git a/arch/powerpc/kvm/book3s_pr_papr.c b/arch/powerpc/kvm/book3s_pr_papr.c
> index 031c8015864a..9384625c8051 100644
> --- a/arch/powerpc/kvm/book3s_pr_papr.c
> +++ b/arch/powerpc/kvm/book3s_pr_papr.c
> @@ -378,7 +378,7 @@ int kvmppc_h_pr(struct kvm_vcpu *vcpu, unsigned long cmd)
>                 kvmppc_set_msr_fast(vcpu, kvmppc_get_msr(vcpu) | MSR_EE);
>                 kvm_vcpu_block(vcpu);
>                 kvm_clear_request(KVM_REQ_UNHALT, vcpu);
> -               vcpu->stat.halt_wakeup++;
> +               vcpu->stat.common.halt_wakeup++;
>                 return EMULATE_DONE;
>         case H_LOGICAL_CI_LOAD:
>                 return kvmppc_h_pr_logical_ci_load(vcpu);
> diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
> index 7d5fe43f85c4..07fdd7a1254a 100644
> --- a/arch/powerpc/kvm/booke.c
> +++ b/arch/powerpc/kvm/booke.c
> @@ -49,15 +49,15 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>         VCPU_STAT("inst_emu", emulated_inst_exits),
>         VCPU_STAT("dec", dec_exits),
>         VCPU_STAT("ext_intr", ext_intr_exits),
> -       VCPU_STAT("halt_successful_poll", halt_successful_poll),
> -       VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> -       VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> -       VCPU_STAT("halt_wakeup", halt_wakeup),
> +       VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> +       VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> +       VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> +       VCPU_STAT_COM("halt_wakeup", halt_wakeup),
>         VCPU_STAT("doorbell", dbell_exits),
>         VCPU_STAT("guest doorbell", gdbell_exits),
> -       VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> -       VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> -       VM_STAT("remote_tlb_flush", remote_tlb_flush),
> +       VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> +       VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
> +       VM_STAT_COM("remote_tlb_flush", remote_tlb_flush),
>         { NULL }
>  };
>
> diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
> index 8925f3969478..57a20897f3db 100644
> --- a/arch/s390/include/asm/kvm_host.h
> +++ b/arch/s390/include/asm/kvm_host.h
> @@ -361,6 +361,7 @@ struct sie_page {
>  };
>
>  struct kvm_vcpu_stat {
> +       struct kvm_vcpu_stat_common common;
>         u64 exit_userspace;
>         u64 exit_null;
>         u64 exit_external_request;
> @@ -370,13 +371,7 @@ struct kvm_vcpu_stat {
>         u64 exit_validity;
>         u64 exit_instruction;
>         u64 exit_pei;
> -       u64 halt_successful_poll;
> -       u64 halt_attempted_poll;
> -       u64 halt_poll_invalid;
>         u64 halt_no_poll_steal;
> -       u64 halt_wakeup;
> -       u64 halt_poll_success_ns;
> -       u64 halt_poll_fail_ns;
>         u64 instruction_lctl;
>         u64 instruction_lctlg;
>         u64 instruction_stctl;
> @@ -755,12 +750,12 @@ struct kvm_vcpu_arch {
>  };
>
>  struct kvm_vm_stat {
> +       struct kvm_vm_stat_common common;
>         u64 inject_io;
>         u64 inject_float_mchk;
>         u64 inject_pfault_done;
>         u64 inject_service_signal;
>         u64 inject_virtio;
> -       u64 remote_tlb_flush;
>  };
>
>  struct kvm_arch_memory_slot {
> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> index 1296fc10f80c..d6bf3372bb10 100644
> --- a/arch/s390/kvm/kvm-s390.c
> +++ b/arch/s390/kvm/kvm-s390.c
> @@ -72,13 +72,13 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>         VCPU_STAT("exit_program_interruption", exit_program_interruption),
>         VCPU_STAT("exit_instr_and_program_int", exit_instr_and_program),
>         VCPU_STAT("exit_operation_exception", exit_operation_exception),
> -       VCPU_STAT("halt_successful_poll", halt_successful_poll),
> -       VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> -       VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> +       VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> +       VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> +       VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
>         VCPU_STAT("halt_no_poll_steal", halt_no_poll_steal),
> -       VCPU_STAT("halt_wakeup", halt_wakeup),
> -       VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> -       VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> +       VCPU_STAT_COM("halt_wakeup", halt_wakeup),
> +       VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> +       VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
>         VCPU_STAT("instruction_lctlg", instruction_lctlg),
>         VCPU_STAT("instruction_lctl", instruction_lctl),
>         VCPU_STAT("instruction_stctl", instruction_stctl),
> diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
> index 55efbacfc244..5bfd6893fbf6 100644
> --- a/arch/x86/include/asm/kvm_host.h
> +++ b/arch/x86/include/asm/kvm_host.h
> @@ -1127,6 +1127,7 @@ struct kvm_arch {
>  };
>
>  struct kvm_vm_stat {
> +       struct kvm_vm_stat_common common;
>         ulong mmu_shadow_zapped;
>         ulong mmu_pte_write;
>         ulong mmu_pde_zapped;
> @@ -1134,13 +1135,13 @@ struct kvm_vm_stat {
>         ulong mmu_recycled;
>         ulong mmu_cache_miss;
>         ulong mmu_unsync;
> -       ulong remote_tlb_flush;
>         ulong lpages;
>         ulong nx_lpage_splits;
>         ulong max_mmu_page_hash_collisions;
>  };
>
>  struct kvm_vcpu_stat {
> +       struct kvm_vcpu_stat_common common;
>         u64 pf_fixed;
>         u64 pf_guest;
>         u64 tlb_flush;
> @@ -1154,10 +1155,6 @@ struct kvm_vcpu_stat {
>         u64 nmi_window_exits;
>         u64 l1d_flush;
>         u64 halt_exits;
> -       u64 halt_successful_poll;
> -       u64 halt_attempted_poll;
> -       u64 halt_poll_invalid;
> -       u64 halt_wakeup;
>         u64 request_irq_exits;
>         u64 irq_exits;
>         u64 host_state_reload;
> @@ -1168,8 +1165,6 @@ struct kvm_vcpu_stat {
>         u64 irq_injections;
>         u64 nmi_injections;
>         u64 req_event;
> -       u64 halt_poll_success_ns;
> -       u64 halt_poll_fail_ns;
>         u64 nested_run;
>         u64 directed_yield_attempted;
>         u64 directed_yield_successful;
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index 9b6bca616929..9a93d80caff6 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -226,10 +226,10 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>         VCPU_STAT("irq_window", irq_window_exits),
>         VCPU_STAT("nmi_window", nmi_window_exits),
>         VCPU_STAT("halt_exits", halt_exits),
> -       VCPU_STAT("halt_successful_poll", halt_successful_poll),
> -       VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> -       VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> -       VCPU_STAT("halt_wakeup", halt_wakeup),
> +       VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> +       VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> +       VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> +       VCPU_STAT_COM("halt_wakeup", halt_wakeup),
>         VCPU_STAT("hypercalls", hypercalls),
>         VCPU_STAT("request_irq", request_irq_exits),
>         VCPU_STAT("irq_exits", irq_exits),
> @@ -241,8 +241,8 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>         VCPU_STAT("nmi_injections", nmi_injections),
>         VCPU_STAT("req_event", req_event),
>         VCPU_STAT("l1d_flush", l1d_flush),
> -       VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> -       VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> +       VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> +       VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
>         VCPU_STAT("nested_run", nested_run),
>         VCPU_STAT("directed_yield_attempted", directed_yield_attempted),
>         VCPU_STAT("directed_yield_successful", directed_yield_successful),
> @@ -253,7 +253,7 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>         VM_STAT("mmu_recycled", mmu_recycled),
>         VM_STAT("mmu_cache_miss", mmu_cache_miss),
>         VM_STAT("mmu_unsync", mmu_unsync),
> -       VM_STAT("remote_tlb_flush", remote_tlb_flush),
> +       VM_STAT_COM("remote_tlb_flush", remote_tlb_flush),
>         VM_STAT("largepages", lpages, .mode = 0444),
>         VM_STAT("nx_largepages_splitted", nx_lpage_splits, .mode = 0444),
>         VM_STAT("max_mmu_page_hash_collisions", max_mmu_page_hash_collisions),
> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> index 2f34487e21f2..97700e41db3b 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -1243,10 +1243,15 @@ struct kvm_stats_debugfs_item {
>  #define KVM_DBGFS_GET_MODE(dbgfs_item)                                         \
>         ((dbgfs_item)->mode ? (dbgfs_item)->mode : 0644)
>
> -#define VM_STAT(n, x, ...)                                                     \
> +#define VM_STAT(n, x, ...)                                                    \
>         { n, offsetof(struct kvm, stat.x), KVM_STAT_VM, ## __VA_ARGS__ }
> -#define VCPU_STAT(n, x, ...)                                                   \
> +#define VCPU_STAT(n, x, ...)                                                  \
>         { n, offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU, ## __VA_ARGS__ }
> +#define VM_STAT_COM(n, x, ...)                                                \
> +       { n, offsetof(struct kvm, stat.common.x), KVM_STAT_VM, ## __VA_ARGS__ }
> +#define VCPU_STAT_COM(n, x, ...)                                              \
> +       { n, offsetof(struct kvm_vcpu, stat.common.x),                         \
> +         KVM_STAT_VCPU, ## __VA_ARGS__ }
>
>  extern struct kvm_stats_debugfs_item debugfs_entries[];
>  extern struct dentry *kvm_debugfs_dir;
> diff --git a/include/linux/kvm_types.h b/include/linux/kvm_types.h
> index a7580f69dda0..87eb05ad678b 100644
> --- a/include/linux/kvm_types.h
> +++ b/include/linux/kvm_types.h
> @@ -76,5 +76,17 @@ struct kvm_mmu_memory_cache {
>  };
>  #endif
>
> +struct kvm_vm_stat_common {
> +       ulong remote_tlb_flush;
> +};
> +
> +struct kvm_vcpu_stat_common {
> +       u64 halt_successful_poll;
> +       u64 halt_attempted_poll;
> +       u64 halt_poll_invalid;
> +       u64 halt_wakeup;
> +       u64 halt_poll_success_ns;
> +       u64 halt_poll_fail_ns;
> +};
>
>  #endif /* __KVM_TYPES_H__ */
> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> index 6b4feb92dc79..34a4cf265297 100644
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -330,7 +330,7 @@ void kvm_flush_remote_tlbs(struct kvm *kvm)
>          */
>         if (!kvm_arch_flush_remote_tlb(kvm)
>             || kvm_make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
> -               ++kvm->stat.remote_tlb_flush;
> +               ++kvm->stat.common.remote_tlb_flush;
>         cmpxchg(&kvm->tlbs_dirty, dirty_count, 0);
>  }
>  EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs);
> @@ -2940,9 +2940,9 @@ static inline void
>  update_halt_poll_stats(struct kvm_vcpu *vcpu, u64 poll_ns, bool waited)
>  {
>         if (waited)
> -               vcpu->stat.halt_poll_fail_ns += poll_ns;
> +               vcpu->stat.common.halt_poll_fail_ns += poll_ns;
>         else
> -               vcpu->stat.halt_poll_success_ns += poll_ns;
> +               vcpu->stat.common.halt_poll_success_ns += poll_ns;
>  }
>
>  /*
> @@ -2960,16 +2960,16 @@ void kvm_vcpu_block(struct kvm_vcpu *vcpu)
>         if (vcpu->halt_poll_ns && !kvm_arch_no_poll(vcpu)) {
>                 ktime_t stop = ktime_add_ns(ktime_get(), vcpu->halt_poll_ns);
>
> -               ++vcpu->stat.halt_attempted_poll;
> +               ++vcpu->stat.common.halt_attempted_poll;
>                 do {
>                         /*
>                          * This sets KVM_REQ_UNHALT if an interrupt
>                          * arrives.
>                          */
>                         if (kvm_vcpu_check_block(vcpu) < 0) {
> -                               ++vcpu->stat.halt_successful_poll;
> +                               ++vcpu->stat.common.halt_successful_poll;
>                                 if (!vcpu_valid_wakeup(vcpu))
> -                                       ++vcpu->stat.halt_poll_invalid;
> +                                       ++vcpu->stat.common.halt_poll_invalid;
>                                 goto out;
>                         }
>                         poll_end = cur = ktime_get();
> @@ -3027,7 +3027,7 @@ bool kvm_vcpu_wake_up(struct kvm_vcpu *vcpu)
>         waitp = kvm_arch_vcpu_get_wait(vcpu);
>         if (rcuwait_wake_up(waitp)) {
>                 WRITE_ONCE(vcpu->ready, true);
> -               ++vcpu->stat.halt_wakeup;
> +               ++vcpu->stat.common.halt_wakeup;
>                 return true;
>         }
>
> --
> 2.31.1.818.g46aad6cb9e-goog
>
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Re: [PATCH v6 1/4] KVM: stats: Separate common stats from architecture specific ones

[Jing Zhang]

On Tue, May 25, 2021 at 4:36 PM David Matlack <dmatlack@google.com> wrote:
>
> On Mon, May 24, 2021 at 8:18 AM Jing Zhang <jingzhangos@google.com> wrote:
> >
> > Put all common statistics in a separate structure to ease
> > statistics handling for the incoming new statistics API.
> >
> > No functional change intended.
> >
> > Reviewed-by: David Matlack <dmatlack@google.com>
>
> FYI I think you only add Reviewed-by tags if they are offered by the
> reviewer explicitly [1]. Offering your Reviewed-by tag is similar to
> hitting the +1 button on Gerrit.
>
> But in any case, this patch looks good so here's my tag:
>
> Reviewed-by: David Matlack <dmatlack@google.com>
>
> [1] https://www.kernel.org/doc/html/v4.17/process/submitting-patches.html#reviewer-s-statement-of-oversight
>
> > Reviewed-by: Ricardo Koller <ricarkol@google.com>
> > Signed-off-by: Jing Zhang <jingzhangos@google.com>
> > ---
> >  arch/arm64/include/asm/kvm_host.h   |  9 ++-------
> >  arch/arm64/kvm/guest.c              | 12 ++++++------
> >  arch/mips/include/asm/kvm_host.h    |  9 ++-------
> >  arch/mips/kvm/mips.c                | 12 ++++++------
> >  arch/powerpc/include/asm/kvm_host.h |  9 ++-------
> >  arch/powerpc/kvm/book3s.c           | 12 ++++++------
> >  arch/powerpc/kvm/book3s_hv.c        | 12 ++++++------
> >  arch/powerpc/kvm/book3s_pr.c        |  2 +-
> >  arch/powerpc/kvm/book3s_pr_papr.c   |  2 +-
> >  arch/powerpc/kvm/booke.c            | 14 +++++++-------
> >  arch/s390/include/asm/kvm_host.h    |  9 ++-------
> >  arch/s390/kvm/kvm-s390.c            | 12 ++++++------
> >  arch/x86/include/asm/kvm_host.h     |  9 ++-------
> >  arch/x86/kvm/x86.c                  | 14 +++++++-------
> >  include/linux/kvm_host.h            |  9 +++++++--
> >  include/linux/kvm_types.h           | 12 ++++++++++++
> >  virt/kvm/kvm_main.c                 | 14 +++++++-------
> >  17 files changed, 82 insertions(+), 90 deletions(-)
> >
> > diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
> > index 7cd7d5c8c4bc..f3ad7a20b0af 100644
> > --- a/arch/arm64/include/asm/kvm_host.h
> > +++ b/arch/arm64/include/asm/kvm_host.h
> > @@ -556,16 +556,11 @@ static inline bool __vcpu_write_sys_reg_to_cpu(u64 val, int reg)
> >  }
> >
> >  struct kvm_vm_stat {
> > -       ulong remote_tlb_flush;
> > +       struct kvm_vm_stat_common common;
> >  };
> >
> >  struct kvm_vcpu_stat {
> > -       u64 halt_successful_poll;
> > -       u64 halt_attempted_poll;
> > -       u64 halt_poll_success_ns;
> > -       u64 halt_poll_fail_ns;
> > -       u64 halt_poll_invalid;
> > -       u64 halt_wakeup;
> > +       struct kvm_vcpu_stat_common common;
> >         u64 hvc_exit_stat;
> >         u64 wfe_exit_stat;
> >         u64 wfi_exit_stat;
> > diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
> > index 5cb4a1cd5603..0e41331b0911 100644
> > --- a/arch/arm64/kvm/guest.c
> > +++ b/arch/arm64/kvm/guest.c
> > @@ -29,18 +29,18 @@
> >  #include "trace.h"
> >
> >  struct kvm_stats_debugfs_item debugfs_entries[] = {
> > -       VCPU_STAT("halt_successful_poll", halt_successful_poll),
> > -       VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> > -       VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> > -       VCPU_STAT("halt_wakeup", halt_wakeup),
> > +       VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> > +       VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> > +       VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> > +       VCPU_STAT_COM("halt_wakeup", halt_wakeup),
> >         VCPU_STAT("hvc_exit_stat", hvc_exit_stat),
> >         VCPU_STAT("wfe_exit_stat", wfe_exit_stat),
> >         VCPU_STAT("wfi_exit_stat", wfi_exit_stat),
> >         VCPU_STAT("mmio_exit_user", mmio_exit_user),
> >         VCPU_STAT("mmio_exit_kernel", mmio_exit_kernel),
> >         VCPU_STAT("exits", exits),
> > -       VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> > -       VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> > +       VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> > +       VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
> >         { NULL }
> >  };
> >
> > diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h
> > index fca4547d580f..6f610fbcd8d1 100644
> > --- a/arch/mips/include/asm/kvm_host.h
> > +++ b/arch/mips/include/asm/kvm_host.h
> > @@ -109,10 +109,11 @@ static inline bool kvm_is_error_hva(unsigned long addr)
> >  }
> >
> >  struct kvm_vm_stat {
> > -       ulong remote_tlb_flush;
> > +       struct kvm_vm_stat_common common;
> >  };
> >
> >  struct kvm_vcpu_stat {
> > +       struct kvm_vcpu_stat_common common;
> >         u64 wait_exits;
> >         u64 cache_exits;
> >         u64 signal_exits;
> > @@ -142,12 +143,6 @@ struct kvm_vcpu_stat {
> >  #ifdef CONFIG_CPU_LOONGSON64
> >         u64 vz_cpucfg_exits;
> >  #endif
> > -       u64 halt_successful_poll;
> > -       u64 halt_attempted_poll;
> > -       u64 halt_poll_success_ns;
> > -       u64 halt_poll_fail_ns;
> > -       u64 halt_poll_invalid;
> > -       u64 halt_wakeup;
> >  };
> >
> >  struct kvm_arch_memory_slot {
> > diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
> > index 4d4af97dcc88..f4fc60c05e9c 100644
> > --- a/arch/mips/kvm/mips.c
> > +++ b/arch/mips/kvm/mips.c
> > @@ -68,12 +68,12 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
> >  #ifdef CONFIG_CPU_LOONGSON64
> >         VCPU_STAT("vz_cpucfg", vz_cpucfg_exits),
> >  #endif
> > -       VCPU_STAT("halt_successful_poll", halt_successful_poll),
> > -       VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> > -       VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> > -       VCPU_STAT("halt_wakeup", halt_wakeup),
> > -       VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> > -       VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> > +       VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> > +       VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> > +       VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> > +       VCPU_STAT_COM("halt_wakeup", halt_wakeup),
> > +       VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> > +       VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
> >         {NULL}
> >  };
> >
> > diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
> > index 1e83359f286b..473d9d0804ff 100644
> > --- a/arch/powerpc/include/asm/kvm_host.h
> > +++ b/arch/powerpc/include/asm/kvm_host.h
> > @@ -80,12 +80,13 @@ struct kvmppc_book3s_shadow_vcpu;
> >  struct kvm_nested_guest;
> >
> >  struct kvm_vm_stat {
> > -       ulong remote_tlb_flush;
> > +       struct kvm_vm_stat_common common;
> >         ulong num_2M_pages;
> >         ulong num_1G_pages;
> >  };
> >
> >  struct kvm_vcpu_stat {
> > +       struct kvm_vcpu_stat_common common;
> >         u64 sum_exits;
> >         u64 mmio_exits;
> >         u64 signal_exits;
> > @@ -101,14 +102,8 @@ struct kvm_vcpu_stat {
> >         u64 emulated_inst_exits;
> >         u64 dec_exits;
> >         u64 ext_intr_exits;
> > -       u64 halt_poll_success_ns;
> > -       u64 halt_poll_fail_ns;
> >         u64 halt_wait_ns;
> > -       u64 halt_successful_poll;
> > -       u64 halt_attempted_poll;
> >         u64 halt_successful_wait;
> > -       u64 halt_poll_invalid;
> > -       u64 halt_wakeup;
> >         u64 dbell_exits;
> >         u64 gdbell_exits;
> >         u64 ld;
> > diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
> > index 2b691f4d1f26..bd3a10e1fdaf 100644
> > --- a/arch/powerpc/kvm/book3s.c
> > +++ b/arch/powerpc/kvm/book3s.c
> > @@ -47,14 +47,14 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
> >         VCPU_STAT("dec", dec_exits),
> >         VCPU_STAT("ext_intr", ext_intr_exits),
> >         VCPU_STAT("queue_intr", queue_intr),
> > -       VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> > -       VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> > +       VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> > +       VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
> >         VCPU_STAT("halt_wait_ns", halt_wait_ns),
> > -       VCPU_STAT("halt_successful_poll", halt_successful_poll),
> > -       VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> > +       VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> > +       VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> >         VCPU_STAT("halt_successful_wait", halt_successful_wait),
> > -       VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> > -       VCPU_STAT("halt_wakeup", halt_wakeup),
> > +       VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> > +       VCPU_STAT_COM("halt_wakeup", halt_wakeup),
> >         VCPU_STAT("pf_storage", pf_storage),
> >         VCPU_STAT("sp_storage", sp_storage),
> >         VCPU_STAT("pf_instruc", pf_instruc),
> > diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
> > index 28a80d240b76..58e187e03c52 100644
> > --- a/arch/powerpc/kvm/book3s_hv.c
> > +++ b/arch/powerpc/kvm/book3s_hv.c
> > @@ -236,7 +236,7 @@ static void kvmppc_fast_vcpu_kick_hv(struct kvm_vcpu *vcpu)
> >
> >         waitp = kvm_arch_vcpu_get_wait(vcpu);
> >         if (rcuwait_wake_up(waitp))
> > -               ++vcpu->stat.halt_wakeup;
> > +               ++vcpu->stat.common.halt_wakeup;
> >
> >         cpu = READ_ONCE(vcpu->arch.thread_cpu);
> >         if (cpu >= 0 && kvmppc_ipi_thread(cpu))
> > @@ -3925,7 +3925,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
> >         cur = start_poll = ktime_get();
> >         if (vc->halt_poll_ns) {
> >                 ktime_t stop = ktime_add_ns(start_poll, vc->halt_poll_ns);
> > -               ++vc->runner->stat.halt_attempted_poll;
> > +               ++vc->runner->stat.common.halt_attempted_poll;
> >
> >                 vc->vcore_state = VCORE_POLLING;
> >                 spin_unlock(&vc->lock);
> > @@ -3942,7 +3942,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
> >                 vc->vcore_state = VCORE_INACTIVE;
> >
> >                 if (!do_sleep) {
> > -                       ++vc->runner->stat.halt_successful_poll;
> > +                       ++vc->runner->stat.common.halt_successful_poll;
> >                         goto out;
> >                 }
> >         }
> > @@ -3954,7 +3954,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
> >                 do_sleep = 0;
> >                 /* If we polled, count this as a successful poll */
> >                 if (vc->halt_poll_ns)
> > -                       ++vc->runner->stat.halt_successful_poll;
> > +                       ++vc->runner->stat.common.halt_successful_poll;
> >                 goto out;
> >         }
> >
> > @@ -3981,13 +3981,13 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
> >                         ktime_to_ns(cur) - ktime_to_ns(start_wait);
> >                 /* Attribute failed poll time */
> >                 if (vc->halt_poll_ns)
> > -                       vc->runner->stat.halt_poll_fail_ns +=
> > +                       vc->runner->stat.common.halt_poll_fail_ns +=
> >                                 ktime_to_ns(start_wait) -
> >                                 ktime_to_ns(start_poll);
> >         } else {
> >                 /* Attribute successful poll time */
> >                 if (vc->halt_poll_ns)
> > -                       vc->runner->stat.halt_poll_success_ns +=
> > +                       vc->runner->stat.common.halt_poll_success_ns +=
> >                                 ktime_to_ns(cur) -
> >                                 ktime_to_ns(start_poll);
> >         }
> > diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c
> > index d7733b07f489..214caa9d9675 100644
> > --- a/arch/powerpc/kvm/book3s_pr.c
> > +++ b/arch/powerpc/kvm/book3s_pr.c
> > @@ -493,7 +493,7 @@ static void kvmppc_set_msr_pr(struct kvm_vcpu *vcpu, u64 msr)
> >                 if (!vcpu->arch.pending_exceptions) {
> >                         kvm_vcpu_block(vcpu);
> >                         kvm_clear_request(KVM_REQ_UNHALT, vcpu);
> > -                       vcpu->stat.halt_wakeup++;
> > +                       vcpu->stat.common.halt_wakeup++;
> >
> >                         /* Unset POW bit after we woke up */
> >                         msr &= ~MSR_POW;
> > diff --git a/arch/powerpc/kvm/book3s_pr_papr.c b/arch/powerpc/kvm/book3s_pr_papr.c
> > index 031c8015864a..9384625c8051 100644
> > --- a/arch/powerpc/kvm/book3s_pr_papr.c
> > +++ b/arch/powerpc/kvm/book3s_pr_papr.c
> > @@ -378,7 +378,7 @@ int kvmppc_h_pr(struct kvm_vcpu *vcpu, unsigned long cmd)
> >                 kvmppc_set_msr_fast(vcpu, kvmppc_get_msr(vcpu) | MSR_EE);
> >                 kvm_vcpu_block(vcpu);
> >                 kvm_clear_request(KVM_REQ_UNHALT, vcpu);
> > -               vcpu->stat.halt_wakeup++;
> > +               vcpu->stat.common.halt_wakeup++;
> >                 return EMULATE_DONE;
> >         case H_LOGICAL_CI_LOAD:
> >                 return kvmppc_h_pr_logical_ci_load(vcpu);
> > diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
> > index 7d5fe43f85c4..07fdd7a1254a 100644
> > --- a/arch/powerpc/kvm/booke.c
> > +++ b/arch/powerpc/kvm/booke.c
> > @@ -49,15 +49,15 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
> >         VCPU_STAT("inst_emu", emulated_inst_exits),
> >         VCPU_STAT("dec", dec_exits),
> >         VCPU_STAT("ext_intr", ext_intr_exits),
> > -       VCPU_STAT("halt_successful_poll", halt_successful_poll),
> > -       VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> > -       VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> > -       VCPU_STAT("halt_wakeup", halt_wakeup),
> > +       VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> > +       VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> > +       VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> > +       VCPU_STAT_COM("halt_wakeup", halt_wakeup),
> >         VCPU_STAT("doorbell", dbell_exits),
> >         VCPU_STAT("guest doorbell", gdbell_exits),
> > -       VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> > -       VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> > -       VM_STAT("remote_tlb_flush", remote_tlb_flush),
> > +       VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> > +       VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
> > +       VM_STAT_COM("remote_tlb_flush", remote_tlb_flush),
> >         { NULL }
> >  };
> >
> > diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
> > index 8925f3969478..57a20897f3db 100644
> > --- a/arch/s390/include/asm/kvm_host.h
> > +++ b/arch/s390/include/asm/kvm_host.h
> > @@ -361,6 +361,7 @@ struct sie_page {
> >  };
> >
> >  struct kvm_vcpu_stat {
> > +       struct kvm_vcpu_stat_common common;
> >         u64 exit_userspace;
> >         u64 exit_null;
> >         u64 exit_external_request;
> > @@ -370,13 +371,7 @@ struct kvm_vcpu_stat {
> >         u64 exit_validity;
> >         u64 exit_instruction;
> >         u64 exit_pei;
> > -       u64 halt_successful_poll;
> > -       u64 halt_attempted_poll;
> > -       u64 halt_poll_invalid;
> >         u64 halt_no_poll_steal;
> > -       u64 halt_wakeup;
> > -       u64 halt_poll_success_ns;
> > -       u64 halt_poll_fail_ns;
> >         u64 instruction_lctl;
> >         u64 instruction_lctlg;
> >         u64 instruction_stctl;
> > @@ -755,12 +750,12 @@ struct kvm_vcpu_arch {
> >  };
> >
> >  struct kvm_vm_stat {
> > +       struct kvm_vm_stat_common common;
> >         u64 inject_io;
> >         u64 inject_float_mchk;
> >         u64 inject_pfault_done;
> >         u64 inject_service_signal;
> >         u64 inject_virtio;
> > -       u64 remote_tlb_flush;
> >  };
> >
> >  struct kvm_arch_memory_slot {
> > diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> > index 1296fc10f80c..d6bf3372bb10 100644
> > --- a/arch/s390/kvm/kvm-s390.c
> > +++ b/arch/s390/kvm/kvm-s390.c
> > @@ -72,13 +72,13 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
> >         VCPU_STAT("exit_program_interruption", exit_program_interruption),
> >         VCPU_STAT("exit_instr_and_program_int", exit_instr_and_program),
> >         VCPU_STAT("exit_operation_exception", exit_operation_exception),
> > -       VCPU_STAT("halt_successful_poll", halt_successful_poll),
> > -       VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> > -       VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> > +       VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> > +       VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> > +       VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> >         VCPU_STAT("halt_no_poll_steal", halt_no_poll_steal),
> > -       VCPU_STAT("halt_wakeup", halt_wakeup),
> > -       VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> > -       VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> > +       VCPU_STAT_COM("halt_wakeup", halt_wakeup),
> > +       VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> > +       VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
> >         VCPU_STAT("instruction_lctlg", instruction_lctlg),
> >         VCPU_STAT("instruction_lctl", instruction_lctl),
> >         VCPU_STAT("instruction_stctl", instruction_stctl),
> > diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
> > index 55efbacfc244..5bfd6893fbf6 100644
> > --- a/arch/x86/include/asm/kvm_host.h
> > +++ b/arch/x86/include/asm/kvm_host.h
> > @@ -1127,6 +1127,7 @@ struct kvm_arch {
> >  };
> >
> >  struct kvm_vm_stat {
> > +       struct kvm_vm_stat_common common;
> >         ulong mmu_shadow_zapped;
> >         ulong mmu_pte_write;
> >         ulong mmu_pde_zapped;
> > @@ -1134,13 +1135,13 @@ struct kvm_vm_stat {
> >         ulong mmu_recycled;
> >         ulong mmu_cache_miss;
> >         ulong mmu_unsync;
> > -       ulong remote_tlb_flush;
> >         ulong lpages;
> >         ulong nx_lpage_splits;
> >         ulong max_mmu_page_hash_collisions;
> >  };
> >
> >  struct kvm_vcpu_stat {
> > +       struct kvm_vcpu_stat_common common;
> >         u64 pf_fixed;
> >         u64 pf_guest;
> >         u64 tlb_flush;
> > @@ -1154,10 +1155,6 @@ struct kvm_vcpu_stat {
> >         u64 nmi_window_exits;
> >         u64 l1d_flush;
> >         u64 halt_exits;
> > -       u64 halt_successful_poll;
> > -       u64 halt_attempted_poll;
> > -       u64 halt_poll_invalid;
> > -       u64 halt_wakeup;
> >         u64 request_irq_exits;
> >         u64 irq_exits;
> >         u64 host_state_reload;
> > @@ -1168,8 +1165,6 @@ struct kvm_vcpu_stat {
> >         u64 irq_injections;
> >         u64 nmi_injections;
> >         u64 req_event;
> > -       u64 halt_poll_success_ns;
> > -       u64 halt_poll_fail_ns;
> >         u64 nested_run;
> >         u64 directed_yield_attempted;
> >         u64 directed_yield_successful;
> > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> > index 9b6bca616929..9a93d80caff6 100644
> > --- a/arch/x86/kvm/x86.c
> > +++ b/arch/x86/kvm/x86.c
> > @@ -226,10 +226,10 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
> >         VCPU_STAT("irq_window", irq_window_exits),
> >         VCPU_STAT("nmi_window", nmi_window_exits),
> >         VCPU_STAT("halt_exits", halt_exits),
> > -       VCPU_STAT("halt_successful_poll", halt_successful_poll),
> > -       VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> > -       VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> > -       VCPU_STAT("halt_wakeup", halt_wakeup),
> > +       VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> > +       VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> > +       VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> > +       VCPU_STAT_COM("halt_wakeup", halt_wakeup),
> >         VCPU_STAT("hypercalls", hypercalls),
> >         VCPU_STAT("request_irq", request_irq_exits),
> >         VCPU_STAT("irq_exits", irq_exits),
> > @@ -241,8 +241,8 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
> >         VCPU_STAT("nmi_injections", nmi_injections),
> >         VCPU_STAT("req_event", req_event),
> >         VCPU_STAT("l1d_flush", l1d_flush),
> > -       VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> > -       VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> > +       VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> > +       VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
> >         VCPU_STAT("nested_run", nested_run),
> >         VCPU_STAT("directed_yield_attempted", directed_yield_attempted),
> >         VCPU_STAT("directed_yield_successful", directed_yield_successful),
> > @@ -253,7 +253,7 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
> >         VM_STAT("mmu_recycled", mmu_recycled),
> >         VM_STAT("mmu_cache_miss", mmu_cache_miss),
> >         VM_STAT("mmu_unsync", mmu_unsync),
> > -       VM_STAT("remote_tlb_flush", remote_tlb_flush),
> > +       VM_STAT_COM("remote_tlb_flush", remote_tlb_flush),
> >         VM_STAT("largepages", lpages, .mode = 0444),
> >         VM_STAT("nx_largepages_splitted", nx_lpage_splits, .mode = 0444),
> >         VM_STAT("max_mmu_page_hash_collisions", max_mmu_page_hash_collisions),
> > diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> > index 2f34487e21f2..97700e41db3b 100644
> > --- a/include/linux/kvm_host.h
> > +++ b/include/linux/kvm_host.h
> > @@ -1243,10 +1243,15 @@ struct kvm_stats_debugfs_item {
> >  #define KVM_DBGFS_GET_MODE(dbgfs_item)                                         \
> >         ((dbgfs_item)->mode ? (dbgfs_item)->mode : 0644)
> >
> > -#define VM_STAT(n, x, ...)                                                     \
> > +#define VM_STAT(n, x, ...)                                                    \
> >         { n, offsetof(struct kvm, stat.x), KVM_STAT_VM, ## __VA_ARGS__ }
> > -#define VCPU_STAT(n, x, ...)                                                   \
> > +#define VCPU_STAT(n, x, ...)                                                  \
> >         { n, offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU, ## __VA_ARGS__ }
> > +#define VM_STAT_COM(n, x, ...)                                                \
> > +       { n, offsetof(struct kvm, stat.common.x), KVM_STAT_VM, ## __VA_ARGS__ }
> > +#define VCPU_STAT_COM(n, x, ...)                                              \
> > +       { n, offsetof(struct kvm_vcpu, stat.common.x),                         \
> > +         KVM_STAT_VCPU, ## __VA_ARGS__ }
> >
> >  extern struct kvm_stats_debugfs_item debugfs_entries[];
> >  extern struct dentry *kvm_debugfs_dir;
> > diff --git a/include/linux/kvm_types.h b/include/linux/kvm_types.h
> > index a7580f69dda0..87eb05ad678b 100644
> > --- a/include/linux/kvm_types.h
> > +++ b/include/linux/kvm_types.h
> > @@ -76,5 +76,17 @@ struct kvm_mmu_memory_cache {
> >  };
> >  #endif
> >
> > +struct kvm_vm_stat_common {
> > +       ulong remote_tlb_flush;
> > +};
> > +
> > +struct kvm_vcpu_stat_common {
> > +       u64 halt_successful_poll;
> > +       u64 halt_attempted_poll;
> > +       u64 halt_poll_invalid;
> > +       u64 halt_wakeup;
> > +       u64 halt_poll_success_ns;
> > +       u64 halt_poll_fail_ns;
> > +};
> >
> >  #endif /* __KVM_TYPES_H__ */
> > diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> > index 6b4feb92dc79..34a4cf265297 100644
> > --- a/virt/kvm/kvm_main.c
> > +++ b/virt/kvm/kvm_main.c
> > @@ -330,7 +330,7 @@ void kvm_flush_remote_tlbs(struct kvm *kvm)
> >          */
> >         if (!kvm_arch_flush_remote_tlb(kvm)
> >             || kvm_make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
> > -               ++kvm->stat.remote_tlb_flush;
> > +               ++kvm->stat.common.remote_tlb_flush;
> >         cmpxchg(&kvm->tlbs_dirty, dirty_count, 0);
> >  }
> >  EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs);
> > @@ -2940,9 +2940,9 @@ static inline void
> >  update_halt_poll_stats(struct kvm_vcpu *vcpu, u64 poll_ns, bool waited)
> >  {
> >         if (waited)
> > -               vcpu->stat.halt_poll_fail_ns += poll_ns;
> > +               vcpu->stat.common.halt_poll_fail_ns += poll_ns;
> >         else
> > -               vcpu->stat.halt_poll_success_ns += poll_ns;
> > +               vcpu->stat.common.halt_poll_success_ns += poll_ns;
> >  }
> >
> >  /*
> > @@ -2960,16 +2960,16 @@ void kvm_vcpu_block(struct kvm_vcpu *vcpu)
> >         if (vcpu->halt_poll_ns && !kvm_arch_no_poll(vcpu)) {
> >                 ktime_t stop = ktime_add_ns(ktime_get(), vcpu->halt_poll_ns);
> >
> > -               ++vcpu->stat.halt_attempted_poll;
> > +               ++vcpu->stat.common.halt_attempted_poll;
> >                 do {
> >                         /*
> >                          * This sets KVM_REQ_UNHALT if an interrupt
> >                          * arrives.
> >                          */
> >                         if (kvm_vcpu_check_block(vcpu) < 0) {
> > -                               ++vcpu->stat.halt_successful_poll;
> > +                               ++vcpu->stat.common.halt_successful_poll;
> >                                 if (!vcpu_valid_wakeup(vcpu))
> > -                                       ++vcpu->stat.halt_poll_invalid;
> > +                                       ++vcpu->stat.common.halt_poll_invalid;
> >                                 goto out;
> >                         }
> >                         poll_end = cur = ktime_get();
> > @@ -3027,7 +3027,7 @@ bool kvm_vcpu_wake_up(struct kvm_vcpu *vcpu)
> >         waitp = kvm_arch_vcpu_get_wait(vcpu);
> >         if (rcuwait_wake_up(waitp)) {
> >                 WRITE_ONCE(vcpu->ready, true);
> > -               ++vcpu->stat.halt_wakeup;
> > +               ++vcpu->stat.common.halt_wakeup;
> >                 return true;
> >         }
> >
> > --
> > 2.31.1.818.g46aad6cb9e-goog
> >
Thanks David!

Jing

Re: [PATCH v6 1/4] KVM: stats: Separate common stats from architecture specific ones

[Jing Zhang]

On Tue, May 25, 2021 at 4:36 PM David Matlack <dmatlack@google.com> wrote:
>
> On Mon, May 24, 2021 at 8:18 AM Jing Zhang <jingzhangos@google.com> wrote:
> >
> > Put all common statistics in a separate structure to ease
> > statistics handling for the incoming new statistics API.
> >
> > No functional change intended.
> >
> > Reviewed-by: David Matlack <dmatlack@google.com>
>
> FYI I think you only add Reviewed-by tags if they are offered by the
> reviewer explicitly [1]. Offering your Reviewed-by tag is similar to
> hitting the +1 button on Gerrit.
>
> But in any case, this patch looks good so here's my tag:
>
> Reviewed-by: David Matlack <dmatlack@google.com>
>
> [1] https://www.kernel.org/doc/html/v4.17/process/submitting-patches.html#reviewer-s-statement-of-oversight
>
> > Reviewed-by: Ricardo Koller <ricarkol@google.com>
> > Signed-off-by: Jing Zhang <jingzhangos@google.com>
> > ---
> >  arch/arm64/include/asm/kvm_host.h   |  9 ++-------
> >  arch/arm64/kvm/guest.c              | 12 ++++++------
> >  arch/mips/include/asm/kvm_host.h    |  9 ++-------
> >  arch/mips/kvm/mips.c                | 12 ++++++------
> >  arch/powerpc/include/asm/kvm_host.h |  9 ++-------
> >  arch/powerpc/kvm/book3s.c           | 12 ++++++------
> >  arch/powerpc/kvm/book3s_hv.c        | 12 ++++++------
> >  arch/powerpc/kvm/book3s_pr.c        |  2 +-
> >  arch/powerpc/kvm/book3s_pr_papr.c   |  2 +-
> >  arch/powerpc/kvm/booke.c            | 14 +++++++-------
> >  arch/s390/include/asm/kvm_host.h    |  9 ++-------
> >  arch/s390/kvm/kvm-s390.c            | 12 ++++++------
> >  arch/x86/include/asm/kvm_host.h     |  9 ++-------
> >  arch/x86/kvm/x86.c                  | 14 +++++++-------
> >  include/linux/kvm_host.h            |  9 +++++++--
> >  include/linux/kvm_types.h           | 12 ++++++++++++
> >  virt/kvm/kvm_main.c                 | 14 +++++++-------
> >  17 files changed, 82 insertions(+), 90 deletions(-)
> >
> > diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
> > index 7cd7d5c8c4bc..f3ad7a20b0af 100644
> > --- a/arch/arm64/include/asm/kvm_host.h
> > +++ b/arch/arm64/include/asm/kvm_host.h
> > @@ -556,16 +556,11 @@ static inline bool __vcpu_write_sys_reg_to_cpu(u64 val, int reg)
> >  }
> >
> >  struct kvm_vm_stat {
> > -       ulong remote_tlb_flush;
> > +       struct kvm_vm_stat_common common;
> >  };
> >
> >  struct kvm_vcpu_stat {
> > -       u64 halt_successful_poll;
> > -       u64 halt_attempted_poll;
> > -       u64 halt_poll_success_ns;
> > -       u64 halt_poll_fail_ns;
> > -       u64 halt_poll_invalid;
> > -       u64 halt_wakeup;
> > +       struct kvm_vcpu_stat_common common;
> >         u64 hvc_exit_stat;
> >         u64 wfe_exit_stat;
> >         u64 wfi_exit_stat;
> > diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
> > index 5cb4a1cd5603..0e41331b0911 100644
> > --- a/arch/arm64/kvm/guest.c
> > +++ b/arch/arm64/kvm/guest.c
> > @@ -29,18 +29,18 @@
> >  #include "trace.h"
> >
> >  struct kvm_stats_debugfs_item debugfs_entries[] = {
> > -       VCPU_STAT("halt_successful_poll", halt_successful_poll),
> > -       VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> > -       VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> > -       VCPU_STAT("halt_wakeup", halt_wakeup),
> > +       VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> > +       VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> > +       VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> > +       VCPU_STAT_COM("halt_wakeup", halt_wakeup),
> >         VCPU_STAT("hvc_exit_stat", hvc_exit_stat),
> >         VCPU_STAT("wfe_exit_stat", wfe_exit_stat),
> >         VCPU_STAT("wfi_exit_stat", wfi_exit_stat),
> >         VCPU_STAT("mmio_exit_user", mmio_exit_user),
> >         VCPU_STAT("mmio_exit_kernel", mmio_exit_kernel),
> >         VCPU_STAT("exits", exits),
> > -       VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> > -       VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> > +       VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> > +       VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
> >         { NULL }
> >  };
> >
> > diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h
> > index fca4547d580f..6f610fbcd8d1 100644
> > --- a/arch/mips/include/asm/kvm_host.h
> > +++ b/arch/mips/include/asm/kvm_host.h
> > @@ -109,10 +109,11 @@ static inline bool kvm_is_error_hva(unsigned long addr)
> >  }
> >
> >  struct kvm_vm_stat {
> > -       ulong remote_tlb_flush;
> > +       struct kvm_vm_stat_common common;
> >  };
> >
> >  struct kvm_vcpu_stat {
> > +       struct kvm_vcpu_stat_common common;
> >         u64 wait_exits;
> >         u64 cache_exits;
> >         u64 signal_exits;
> > @@ -142,12 +143,6 @@ struct kvm_vcpu_stat {
> >  #ifdef CONFIG_CPU_LOONGSON64
> >         u64 vz_cpucfg_exits;
> >  #endif
> > -       u64 halt_successful_poll;
> > -       u64 halt_attempted_poll;
> > -       u64 halt_poll_success_ns;
> > -       u64 halt_poll_fail_ns;
> > -       u64 halt_poll_invalid;
> > -       u64 halt_wakeup;
> >  };
> >
> >  struct kvm_arch_memory_slot {
> > diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
> > index 4d4af97dcc88..f4fc60c05e9c 100644
> > --- a/arch/mips/kvm/mips.c
> > +++ b/arch/mips/kvm/mips.c
> > @@ -68,12 +68,12 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
> >  #ifdef CONFIG_CPU_LOONGSON64
> >         VCPU_STAT("vz_cpucfg", vz_cpucfg_exits),
> >  #endif
> > -       VCPU_STAT("halt_successful_poll", halt_successful_poll),
> > -       VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> > -       VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> > -       VCPU_STAT("halt_wakeup", halt_wakeup),
> > -       VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> > -       VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> > +       VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> > +       VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> > +       VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> > +       VCPU_STAT_COM("halt_wakeup", halt_wakeup),
> > +       VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> > +       VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
> >         {NULL}
> >  };
> >
> > diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
> > index 1e83359f286b..473d9d0804ff 100644
> > --- a/arch/powerpc/include/asm/kvm_host.h
> > +++ b/arch/powerpc/include/asm/kvm_host.h
> > @@ -80,12 +80,13 @@ struct kvmppc_book3s_shadow_vcpu;
> >  struct kvm_nested_guest;
> >
> >  struct kvm_vm_stat {
> > -       ulong remote_tlb_flush;
> > +       struct kvm_vm_stat_common common;
> >         ulong num_2M_pages;
> >         ulong num_1G_pages;
> >  };
> >
> >  struct kvm_vcpu_stat {
> > +       struct kvm_vcpu_stat_common common;
> >         u64 sum_exits;
> >         u64 mmio_exits;
> >         u64 signal_exits;
> > @@ -101,14 +102,8 @@ struct kvm_vcpu_stat {
> >         u64 emulated_inst_exits;
> >         u64 dec_exits;
> >         u64 ext_intr_exits;
> > -       u64 halt_poll_success_ns;
> > -       u64 halt_poll_fail_ns;
> >         u64 halt_wait_ns;
> > -       u64 halt_successful_poll;
> > -       u64 halt_attempted_poll;
> >         u64 halt_successful_wait;
> > -       u64 halt_poll_invalid;
> > -       u64 halt_wakeup;
> >         u64 dbell_exits;
> >         u64 gdbell_exits;
> >         u64 ld;
> > diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
> > index 2b691f4d1f26..bd3a10e1fdaf 100644
> > --- a/arch/powerpc/kvm/book3s.c
> > +++ b/arch/powerpc/kvm/book3s.c
> > @@ -47,14 +47,14 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
> >         VCPU_STAT("dec", dec_exits),
> >         VCPU_STAT("ext_intr", ext_intr_exits),
> >         VCPU_STAT("queue_intr", queue_intr),
> > -       VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> > -       VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> > +       VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> > +       VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
> >         VCPU_STAT("halt_wait_ns", halt_wait_ns),
> > -       VCPU_STAT("halt_successful_poll", halt_successful_poll),
> > -       VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> > +       VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> > +       VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> >         VCPU_STAT("halt_successful_wait", halt_successful_wait),
> > -       VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> > -       VCPU_STAT("halt_wakeup", halt_wakeup),
> > +       VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> > +       VCPU_STAT_COM("halt_wakeup", halt_wakeup),
> >         VCPU_STAT("pf_storage", pf_storage),
> >         VCPU_STAT("sp_storage", sp_storage),
> >         VCPU_STAT("pf_instruc", pf_instruc),
> > diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
> > index 28a80d240b76..58e187e03c52 100644
> > --- a/arch/powerpc/kvm/book3s_hv.c
> > +++ b/arch/powerpc/kvm/book3s_hv.c
> > @@ -236,7 +236,7 @@ static void kvmppc_fast_vcpu_kick_hv(struct kvm_vcpu *vcpu)
> >
> >         waitp = kvm_arch_vcpu_get_wait(vcpu);
> >         if (rcuwait_wake_up(waitp))
> > -               ++vcpu->stat.halt_wakeup;
> > +               ++vcpu->stat.common.halt_wakeup;
> >
> >         cpu = READ_ONCE(vcpu->arch.thread_cpu);
> >         if (cpu >= 0 && kvmppc_ipi_thread(cpu))
> > @@ -3925,7 +3925,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
> >         cur = start_poll = ktime_get();
> >         if (vc->halt_poll_ns) {
> >                 ktime_t stop = ktime_add_ns(start_poll, vc->halt_poll_ns);
> > -               ++vc->runner->stat.halt_attempted_poll;
> > +               ++vc->runner->stat.common.halt_attempted_poll;
> >
> >                 vc->vcore_state = VCORE_POLLING;
> >                 spin_unlock(&vc->lock);
> > @@ -3942,7 +3942,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
> >                 vc->vcore_state = VCORE_INACTIVE;
> >
> >                 if (!do_sleep) {
> > -                       ++vc->runner->stat.halt_successful_poll;
> > +                       ++vc->runner->stat.common.halt_successful_poll;
> >                         goto out;
> >                 }
> >         }
> > @@ -3954,7 +3954,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
> >                 do_sleep = 0;
> >                 /* If we polled, count this as a successful poll */
> >                 if (vc->halt_poll_ns)
> > -                       ++vc->runner->stat.halt_successful_poll;
> > +                       ++vc->runner->stat.common.halt_successful_poll;
> >                 goto out;
> >         }
> >
> > @@ -3981,13 +3981,13 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
> >                         ktime_to_ns(cur) - ktime_to_ns(start_wait);
> >                 /* Attribute failed poll time */
> >                 if (vc->halt_poll_ns)
> > -                       vc->runner->stat.halt_poll_fail_ns +> > +                       vc->runner->stat.common.halt_poll_fail_ns +> >                                 ktime_to_ns(start_wait) -
> >                                 ktime_to_ns(start_poll);
> >         } else {
> >                 /* Attribute successful poll time */
> >                 if (vc->halt_poll_ns)
> > -                       vc->runner->stat.halt_poll_success_ns +> > +                       vc->runner->stat.common.halt_poll_success_ns +> >                                 ktime_to_ns(cur) -
> >                                 ktime_to_ns(start_poll);
> >         }
> > diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c
> > index d7733b07f489..214caa9d9675 100644
> > --- a/arch/powerpc/kvm/book3s_pr.c
> > +++ b/arch/powerpc/kvm/book3s_pr.c
> > @@ -493,7 +493,7 @@ static void kvmppc_set_msr_pr(struct kvm_vcpu *vcpu, u64 msr)
> >                 if (!vcpu->arch.pending_exceptions) {
> >                         kvm_vcpu_block(vcpu);
> >                         kvm_clear_request(KVM_REQ_UNHALT, vcpu);
> > -                       vcpu->stat.halt_wakeup++;
> > +                       vcpu->stat.common.halt_wakeup++;
> >
> >                         /* Unset POW bit after we woke up */
> >                         msr &= ~MSR_POW;
> > diff --git a/arch/powerpc/kvm/book3s_pr_papr.c b/arch/powerpc/kvm/book3s_pr_papr.c
> > index 031c8015864a..9384625c8051 100644
> > --- a/arch/powerpc/kvm/book3s_pr_papr.c
> > +++ b/arch/powerpc/kvm/book3s_pr_papr.c
> > @@ -378,7 +378,7 @@ int kvmppc_h_pr(struct kvm_vcpu *vcpu, unsigned long cmd)
> >                 kvmppc_set_msr_fast(vcpu, kvmppc_get_msr(vcpu) | MSR_EE);
> >                 kvm_vcpu_block(vcpu);
> >                 kvm_clear_request(KVM_REQ_UNHALT, vcpu);
> > -               vcpu->stat.halt_wakeup++;
> > +               vcpu->stat.common.halt_wakeup++;
> >                 return EMULATE_DONE;
> >         case H_LOGICAL_CI_LOAD:
> >                 return kvmppc_h_pr_logical_ci_load(vcpu);
> > diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
> > index 7d5fe43f85c4..07fdd7a1254a 100644
> > --- a/arch/powerpc/kvm/booke.c
> > +++ b/arch/powerpc/kvm/booke.c
> > @@ -49,15 +49,15 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
> >         VCPU_STAT("inst_emu", emulated_inst_exits),
> >         VCPU_STAT("dec", dec_exits),
> >         VCPU_STAT("ext_intr", ext_intr_exits),
> > -       VCPU_STAT("halt_successful_poll", halt_successful_poll),
> > -       VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> > -       VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> > -       VCPU_STAT("halt_wakeup", halt_wakeup),
> > +       VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> > +       VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> > +       VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> > +       VCPU_STAT_COM("halt_wakeup", halt_wakeup),
> >         VCPU_STAT("doorbell", dbell_exits),
> >         VCPU_STAT("guest doorbell", gdbell_exits),
> > -       VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> > -       VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> > -       VM_STAT("remote_tlb_flush", remote_tlb_flush),
> > +       VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> > +       VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
> > +       VM_STAT_COM("remote_tlb_flush", remote_tlb_flush),
> >         { NULL }
> >  };
> >
> > diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
> > index 8925f3969478..57a20897f3db 100644
> > --- a/arch/s390/include/asm/kvm_host.h
> > +++ b/arch/s390/include/asm/kvm_host.h
> > @@ -361,6 +361,7 @@ struct sie_page {
> >  };
> >
> >  struct kvm_vcpu_stat {
> > +       struct kvm_vcpu_stat_common common;
> >         u64 exit_userspace;
> >         u64 exit_null;
> >         u64 exit_external_request;
> > @@ -370,13 +371,7 @@ struct kvm_vcpu_stat {
> >         u64 exit_validity;
> >         u64 exit_instruction;
> >         u64 exit_pei;
> > -       u64 halt_successful_poll;
> > -       u64 halt_attempted_poll;
> > -       u64 halt_poll_invalid;
> >         u64 halt_no_poll_steal;
> > -       u64 halt_wakeup;
> > -       u64 halt_poll_success_ns;
> > -       u64 halt_poll_fail_ns;
> >         u64 instruction_lctl;
> >         u64 instruction_lctlg;
> >         u64 instruction_stctl;
> > @@ -755,12 +750,12 @@ struct kvm_vcpu_arch {
> >  };
> >
> >  struct kvm_vm_stat {
> > +       struct kvm_vm_stat_common common;
> >         u64 inject_io;
> >         u64 inject_float_mchk;
> >         u64 inject_pfault_done;
> >         u64 inject_service_signal;
> >         u64 inject_virtio;
> > -       u64 remote_tlb_flush;
> >  };
> >
> >  struct kvm_arch_memory_slot {
> > diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> > index 1296fc10f80c..d6bf3372bb10 100644
> > --- a/arch/s390/kvm/kvm-s390.c
> > +++ b/arch/s390/kvm/kvm-s390.c
> > @@ -72,13 +72,13 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
> >         VCPU_STAT("exit_program_interruption", exit_program_interruption),
> >         VCPU_STAT("exit_instr_and_program_int", exit_instr_and_program),
> >         VCPU_STAT("exit_operation_exception", exit_operation_exception),
> > -       VCPU_STAT("halt_successful_poll", halt_successful_poll),
> > -       VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> > -       VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> > +       VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> > +       VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> > +       VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> >         VCPU_STAT("halt_no_poll_steal", halt_no_poll_steal),
> > -       VCPU_STAT("halt_wakeup", halt_wakeup),
> > -       VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> > -       VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> > +       VCPU_STAT_COM("halt_wakeup", halt_wakeup),
> > +       VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> > +       VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
> >         VCPU_STAT("instruction_lctlg", instruction_lctlg),
> >         VCPU_STAT("instruction_lctl", instruction_lctl),
> >         VCPU_STAT("instruction_stctl", instruction_stctl),
> > diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
> > index 55efbacfc244..5bfd6893fbf6 100644
> > --- a/arch/x86/include/asm/kvm_host.h
> > +++ b/arch/x86/include/asm/kvm_host.h
> > @@ -1127,6 +1127,7 @@ struct kvm_arch {
> >  };
> >
> >  struct kvm_vm_stat {
> > +       struct kvm_vm_stat_common common;
> >         ulong mmu_shadow_zapped;
> >         ulong mmu_pte_write;
> >         ulong mmu_pde_zapped;
> > @@ -1134,13 +1135,13 @@ struct kvm_vm_stat {
> >         ulong mmu_recycled;
> >         ulong mmu_cache_miss;
> >         ulong mmu_unsync;
> > -       ulong remote_tlb_flush;
> >         ulong lpages;
> >         ulong nx_lpage_splits;
> >         ulong max_mmu_page_hash_collisions;
> >  };
> >
> >  struct kvm_vcpu_stat {
> > +       struct kvm_vcpu_stat_common common;
> >         u64 pf_fixed;
> >         u64 pf_guest;
> >         u64 tlb_flush;
> > @@ -1154,10 +1155,6 @@ struct kvm_vcpu_stat {
> >         u64 nmi_window_exits;
> >         u64 l1d_flush;
> >         u64 halt_exits;
> > -       u64 halt_successful_poll;
> > -       u64 halt_attempted_poll;
> > -       u64 halt_poll_invalid;
> > -       u64 halt_wakeup;
> >         u64 request_irq_exits;
> >         u64 irq_exits;
> >         u64 host_state_reload;
> > @@ -1168,8 +1165,6 @@ struct kvm_vcpu_stat {
> >         u64 irq_injections;
> >         u64 nmi_injections;
> >         u64 req_event;
> > -       u64 halt_poll_success_ns;
> > -       u64 halt_poll_fail_ns;
> >         u64 nested_run;
> >         u64 directed_yield_attempted;
> >         u64 directed_yield_successful;
> > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> > index 9b6bca616929..9a93d80caff6 100644
> > --- a/arch/x86/kvm/x86.c
> > +++ b/arch/x86/kvm/x86.c
> > @@ -226,10 +226,10 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
> >         VCPU_STAT("irq_window", irq_window_exits),
> >         VCPU_STAT("nmi_window", nmi_window_exits),
> >         VCPU_STAT("halt_exits", halt_exits),
> > -       VCPU_STAT("halt_successful_poll", halt_successful_poll),
> > -       VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> > -       VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> > -       VCPU_STAT("halt_wakeup", halt_wakeup),
> > +       VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> > +       VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> > +       VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> > +       VCPU_STAT_COM("halt_wakeup", halt_wakeup),
> >         VCPU_STAT("hypercalls", hypercalls),
> >         VCPU_STAT("request_irq", request_irq_exits),
> >         VCPU_STAT("irq_exits", irq_exits),
> > @@ -241,8 +241,8 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
> >         VCPU_STAT("nmi_injections", nmi_injections),
> >         VCPU_STAT("req_event", req_event),
> >         VCPU_STAT("l1d_flush", l1d_flush),
> > -       VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> > -       VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> > +       VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> > +       VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
> >         VCPU_STAT("nested_run", nested_run),
> >         VCPU_STAT("directed_yield_attempted", directed_yield_attempted),
> >         VCPU_STAT("directed_yield_successful", directed_yield_successful),
> > @@ -253,7 +253,7 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
> >         VM_STAT("mmu_recycled", mmu_recycled),
> >         VM_STAT("mmu_cache_miss", mmu_cache_miss),
> >         VM_STAT("mmu_unsync", mmu_unsync),
> > -       VM_STAT("remote_tlb_flush", remote_tlb_flush),
> > +       VM_STAT_COM("remote_tlb_flush", remote_tlb_flush),
> >         VM_STAT("largepages", lpages, .mode = 0444),
> >         VM_STAT("nx_largepages_splitted", nx_lpage_splits, .mode = 0444),
> >         VM_STAT("max_mmu_page_hash_collisions", max_mmu_page_hash_collisions),
> > diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> > index 2f34487e21f2..97700e41db3b 100644
> > --- a/include/linux/kvm_host.h
> > +++ b/include/linux/kvm_host.h
> > @@ -1243,10 +1243,15 @@ struct kvm_stats_debugfs_item {
> >  #define KVM_DBGFS_GET_MODE(dbgfs_item)                                         \
> >         ((dbgfs_item)->mode ? (dbgfs_item)->mode : 0644)
> >
> > -#define VM_STAT(n, x, ...)                                                     \
> > +#define VM_STAT(n, x, ...)                                                    \
> >         { n, offsetof(struct kvm, stat.x), KVM_STAT_VM, ## __VA_ARGS__ }
> > -#define VCPU_STAT(n, x, ...)                                                   \
> > +#define VCPU_STAT(n, x, ...)                                                  \
> >         { n, offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU, ## __VA_ARGS__ }
> > +#define VM_STAT_COM(n, x, ...)                                                \
> > +       { n, offsetof(struct kvm, stat.common.x), KVM_STAT_VM, ## __VA_ARGS__ }
> > +#define VCPU_STAT_COM(n, x, ...)                                              \
> > +       { n, offsetof(struct kvm_vcpu, stat.common.x),                         \
> > +         KVM_STAT_VCPU, ## __VA_ARGS__ }
> >
> >  extern struct kvm_stats_debugfs_item debugfs_entries[];
> >  extern struct dentry *kvm_debugfs_dir;
> > diff --git a/include/linux/kvm_types.h b/include/linux/kvm_types.h
> > index a7580f69dda0..87eb05ad678b 100644
> > --- a/include/linux/kvm_types.h
> > +++ b/include/linux/kvm_types.h
> > @@ -76,5 +76,17 @@ struct kvm_mmu_memory_cache {
> >  };
> >  #endif
> >
> > +struct kvm_vm_stat_common {
> > +       ulong remote_tlb_flush;
> > +};
> > +
> > +struct kvm_vcpu_stat_common {
> > +       u64 halt_successful_poll;
> > +       u64 halt_attempted_poll;
> > +       u64 halt_poll_invalid;
> > +       u64 halt_wakeup;
> > +       u64 halt_poll_success_ns;
> > +       u64 halt_poll_fail_ns;
> > +};
> >
> >  #endif /* __KVM_TYPES_H__ */
> > diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> > index 6b4feb92dc79..34a4cf265297 100644
> > --- a/virt/kvm/kvm_main.c
> > +++ b/virt/kvm/kvm_main.c
> > @@ -330,7 +330,7 @@ void kvm_flush_remote_tlbs(struct kvm *kvm)
> >          */
> >         if (!kvm_arch_flush_remote_tlb(kvm)
> >             || kvm_make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
> > -               ++kvm->stat.remote_tlb_flush;
> > +               ++kvm->stat.common.remote_tlb_flush;
> >         cmpxchg(&kvm->tlbs_dirty, dirty_count, 0);
> >  }
> >  EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs);
> > @@ -2940,9 +2940,9 @@ static inline void
> >  update_halt_poll_stats(struct kvm_vcpu *vcpu, u64 poll_ns, bool waited)
> >  {
> >         if (waited)
> > -               vcpu->stat.halt_poll_fail_ns += poll_ns;
> > +               vcpu->stat.common.halt_poll_fail_ns += poll_ns;
> >         else
> > -               vcpu->stat.halt_poll_success_ns += poll_ns;
> > +               vcpu->stat.common.halt_poll_success_ns += poll_ns;
> >  }
> >
> >  /*
> > @@ -2960,16 +2960,16 @@ void kvm_vcpu_block(struct kvm_vcpu *vcpu)
> >         if (vcpu->halt_poll_ns && !kvm_arch_no_poll(vcpu)) {
> >                 ktime_t stop = ktime_add_ns(ktime_get(), vcpu->halt_poll_ns);
> >
> > -               ++vcpu->stat.halt_attempted_poll;
> > +               ++vcpu->stat.common.halt_attempted_poll;
> >                 do {
> >                         /*
> >                          * This sets KVM_REQ_UNHALT if an interrupt
> >                          * arrives.
> >                          */
> >                         if (kvm_vcpu_check_block(vcpu) < 0) {
> > -                               ++vcpu->stat.halt_successful_poll;
> > +                               ++vcpu->stat.common.halt_successful_poll;
> >                                 if (!vcpu_valid_wakeup(vcpu))
> > -                                       ++vcpu->stat.halt_poll_invalid;
> > +                                       ++vcpu->stat.common.halt_poll_invalid;
> >                                 goto out;
> >                         }
> >                         poll_end = cur = ktime_get();
> > @@ -3027,7 +3027,7 @@ bool kvm_vcpu_wake_up(struct kvm_vcpu *vcpu)
> >         waitp = kvm_arch_vcpu_get_wait(vcpu);
> >         if (rcuwait_wake_up(waitp)) {
> >                 WRITE_ONCE(vcpu->ready, true);
> > -               ++vcpu->stat.halt_wakeup;
> > +               ++vcpu->stat.common.halt_wakeup;
> >                 return true;
> >         }
> >
> > --
> > 2.31.1.818.g46aad6cb9e-goog
> >
Thanks David!

Jing

Re: [PATCH v6 1/4] KVM: stats: Separate common stats from architecture specific ones

[Jing Zhang]

On Tue, May 25, 2021 at 4:36 PM David Matlack <dmatlack@google.com> wrote:
>
> On Mon, May 24, 2021 at 8:18 AM Jing Zhang <jingzhangos@google.com> wrote:
> >
> > Put all common statistics in a separate structure to ease
> > statistics handling for the incoming new statistics API.
> >
> > No functional change intended.
> >
> > Reviewed-by: David Matlack <dmatlack@google.com>
>
> FYI I think you only add Reviewed-by tags if they are offered by the
> reviewer explicitly [1]. Offering your Reviewed-by tag is similar to
> hitting the +1 button on Gerrit.
>
> But in any case, this patch looks good so here's my tag:
>
> Reviewed-by: David Matlack <dmatlack@google.com>
>
> [1] https://www.kernel.org/doc/html/v4.17/process/submitting-patches.html#reviewer-s-statement-of-oversight
>
> > Reviewed-by: Ricardo Koller <ricarkol@google.com>
> > Signed-off-by: Jing Zhang <jingzhangos@google.com>
> > ---
> >  arch/arm64/include/asm/kvm_host.h   |  9 ++-------
> >  arch/arm64/kvm/guest.c              | 12 ++++++------
> >  arch/mips/include/asm/kvm_host.h    |  9 ++-------
> >  arch/mips/kvm/mips.c                | 12 ++++++------
> >  arch/powerpc/include/asm/kvm_host.h |  9 ++-------
> >  arch/powerpc/kvm/book3s.c           | 12 ++++++------
> >  arch/powerpc/kvm/book3s_hv.c        | 12 ++++++------
> >  arch/powerpc/kvm/book3s_pr.c        |  2 +-
> >  arch/powerpc/kvm/book3s_pr_papr.c   |  2 +-
> >  arch/powerpc/kvm/booke.c            | 14 +++++++-------
> >  arch/s390/include/asm/kvm_host.h    |  9 ++-------
> >  arch/s390/kvm/kvm-s390.c            | 12 ++++++------
> >  arch/x86/include/asm/kvm_host.h     |  9 ++-------
> >  arch/x86/kvm/x86.c                  | 14 +++++++-------
> >  include/linux/kvm_host.h            |  9 +++++++--
> >  include/linux/kvm_types.h           | 12 ++++++++++++
> >  virt/kvm/kvm_main.c                 | 14 +++++++-------
> >  17 files changed, 82 insertions(+), 90 deletions(-)
> >
> > diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
> > index 7cd7d5c8c4bc..f3ad7a20b0af 100644
> > --- a/arch/arm64/include/asm/kvm_host.h
> > +++ b/arch/arm64/include/asm/kvm_host.h
> > @@ -556,16 +556,11 @@ static inline bool __vcpu_write_sys_reg_to_cpu(u64 val, int reg)
> >  }
> >
> >  struct kvm_vm_stat {
> > -       ulong remote_tlb_flush;
> > +       struct kvm_vm_stat_common common;
> >  };
> >
> >  struct kvm_vcpu_stat {
> > -       u64 halt_successful_poll;
> > -       u64 halt_attempted_poll;
> > -       u64 halt_poll_success_ns;
> > -       u64 halt_poll_fail_ns;
> > -       u64 halt_poll_invalid;
> > -       u64 halt_wakeup;
> > +       struct kvm_vcpu_stat_common common;
> >         u64 hvc_exit_stat;
> >         u64 wfe_exit_stat;
> >         u64 wfi_exit_stat;
> > diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
> > index 5cb4a1cd5603..0e41331b0911 100644
> > --- a/arch/arm64/kvm/guest.c
> > +++ b/arch/arm64/kvm/guest.c
> > @@ -29,18 +29,18 @@
> >  #include "trace.h"
> >
> >  struct kvm_stats_debugfs_item debugfs_entries[] = {
> > -       VCPU_STAT("halt_successful_poll", halt_successful_poll),
> > -       VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> > -       VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> > -       VCPU_STAT("halt_wakeup", halt_wakeup),
> > +       VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> > +       VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> > +       VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> > +       VCPU_STAT_COM("halt_wakeup", halt_wakeup),
> >         VCPU_STAT("hvc_exit_stat", hvc_exit_stat),
> >         VCPU_STAT("wfe_exit_stat", wfe_exit_stat),
> >         VCPU_STAT("wfi_exit_stat", wfi_exit_stat),
> >         VCPU_STAT("mmio_exit_user", mmio_exit_user),
> >         VCPU_STAT("mmio_exit_kernel", mmio_exit_kernel),
> >         VCPU_STAT("exits", exits),
> > -       VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> > -       VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> > +       VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> > +       VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
> >         { NULL }
> >  };
> >
> > diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h
> > index fca4547d580f..6f610fbcd8d1 100644
> > --- a/arch/mips/include/asm/kvm_host.h
> > +++ b/arch/mips/include/asm/kvm_host.h
> > @@ -109,10 +109,11 @@ static inline bool kvm_is_error_hva(unsigned long addr)
> >  }
> >
> >  struct kvm_vm_stat {
> > -       ulong remote_tlb_flush;
> > +       struct kvm_vm_stat_common common;
> >  };
> >
> >  struct kvm_vcpu_stat {
> > +       struct kvm_vcpu_stat_common common;
> >         u64 wait_exits;
> >         u64 cache_exits;
> >         u64 signal_exits;
> > @@ -142,12 +143,6 @@ struct kvm_vcpu_stat {
> >  #ifdef CONFIG_CPU_LOONGSON64
> >         u64 vz_cpucfg_exits;
> >  #endif
> > -       u64 halt_successful_poll;
> > -       u64 halt_attempted_poll;
> > -       u64 halt_poll_success_ns;
> > -       u64 halt_poll_fail_ns;
> > -       u64 halt_poll_invalid;
> > -       u64 halt_wakeup;
> >  };
> >
> >  struct kvm_arch_memory_slot {
> > diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
> > index 4d4af97dcc88..f4fc60c05e9c 100644
> > --- a/arch/mips/kvm/mips.c
> > +++ b/arch/mips/kvm/mips.c
> > @@ -68,12 +68,12 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
> >  #ifdef CONFIG_CPU_LOONGSON64
> >         VCPU_STAT("vz_cpucfg", vz_cpucfg_exits),
> >  #endif
> > -       VCPU_STAT("halt_successful_poll", halt_successful_poll),
> > -       VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> > -       VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> > -       VCPU_STAT("halt_wakeup", halt_wakeup),
> > -       VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> > -       VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> > +       VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> > +       VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> > +       VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> > +       VCPU_STAT_COM("halt_wakeup", halt_wakeup),
> > +       VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> > +       VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
> >         {NULL}
> >  };
> >
> > diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
> > index 1e83359f286b..473d9d0804ff 100644
> > --- a/arch/powerpc/include/asm/kvm_host.h
> > +++ b/arch/powerpc/include/asm/kvm_host.h
> > @@ -80,12 +80,13 @@ struct kvmppc_book3s_shadow_vcpu;
> >  struct kvm_nested_guest;
> >
> >  struct kvm_vm_stat {
> > -       ulong remote_tlb_flush;
> > +       struct kvm_vm_stat_common common;
> >         ulong num_2M_pages;
> >         ulong num_1G_pages;
> >  };
> >
> >  struct kvm_vcpu_stat {
> > +       struct kvm_vcpu_stat_common common;
> >         u64 sum_exits;
> >         u64 mmio_exits;
> >         u64 signal_exits;
> > @@ -101,14 +102,8 @@ struct kvm_vcpu_stat {
> >         u64 emulated_inst_exits;
> >         u64 dec_exits;
> >         u64 ext_intr_exits;
> > -       u64 halt_poll_success_ns;
> > -       u64 halt_poll_fail_ns;
> >         u64 halt_wait_ns;
> > -       u64 halt_successful_poll;
> > -       u64 halt_attempted_poll;
> >         u64 halt_successful_wait;
> > -       u64 halt_poll_invalid;
> > -       u64 halt_wakeup;
> >         u64 dbell_exits;
> >         u64 gdbell_exits;
> >         u64 ld;
> > diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
> > index 2b691f4d1f26..bd3a10e1fdaf 100644
> > --- a/arch/powerpc/kvm/book3s.c
> > +++ b/arch/powerpc/kvm/book3s.c
> > @@ -47,14 +47,14 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
> >         VCPU_STAT("dec", dec_exits),
> >         VCPU_STAT("ext_intr", ext_intr_exits),
> >         VCPU_STAT("queue_intr", queue_intr),
> > -       VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> > -       VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> > +       VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> > +       VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
> >         VCPU_STAT("halt_wait_ns", halt_wait_ns),
> > -       VCPU_STAT("halt_successful_poll", halt_successful_poll),
> > -       VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> > +       VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> > +       VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> >         VCPU_STAT("halt_successful_wait", halt_successful_wait),
> > -       VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> > -       VCPU_STAT("halt_wakeup", halt_wakeup),
> > +       VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> > +       VCPU_STAT_COM("halt_wakeup", halt_wakeup),
> >         VCPU_STAT("pf_storage", pf_storage),
> >         VCPU_STAT("sp_storage", sp_storage),
> >         VCPU_STAT("pf_instruc", pf_instruc),
> > diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
> > index 28a80d240b76..58e187e03c52 100644
> > --- a/arch/powerpc/kvm/book3s_hv.c
> > +++ b/arch/powerpc/kvm/book3s_hv.c
> > @@ -236,7 +236,7 @@ static void kvmppc_fast_vcpu_kick_hv(struct kvm_vcpu *vcpu)
> >
> >         waitp = kvm_arch_vcpu_get_wait(vcpu);
> >         if (rcuwait_wake_up(waitp))
> > -               ++vcpu->stat.halt_wakeup;
> > +               ++vcpu->stat.common.halt_wakeup;
> >
> >         cpu = READ_ONCE(vcpu->arch.thread_cpu);
> >         if (cpu >= 0 && kvmppc_ipi_thread(cpu))
> > @@ -3925,7 +3925,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
> >         cur = start_poll = ktime_get();
> >         if (vc->halt_poll_ns) {
> >                 ktime_t stop = ktime_add_ns(start_poll, vc->halt_poll_ns);
> > -               ++vc->runner->stat.halt_attempted_poll;
> > +               ++vc->runner->stat.common.halt_attempted_poll;
> >
> >                 vc->vcore_state = VCORE_POLLING;
> >                 spin_unlock(&vc->lock);
> > @@ -3942,7 +3942,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
> >                 vc->vcore_state = VCORE_INACTIVE;
> >
> >                 if (!do_sleep) {
> > -                       ++vc->runner->stat.halt_successful_poll;
> > +                       ++vc->runner->stat.common.halt_successful_poll;
> >                         goto out;
> >                 }
> >         }
> > @@ -3954,7 +3954,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
> >                 do_sleep = 0;
> >                 /* If we polled, count this as a successful poll */
> >                 if (vc->halt_poll_ns)
> > -                       ++vc->runner->stat.halt_successful_poll;
> > +                       ++vc->runner->stat.common.halt_successful_poll;
> >                 goto out;
> >         }
> >
> > @@ -3981,13 +3981,13 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
> >                         ktime_to_ns(cur) - ktime_to_ns(start_wait);
> >                 /* Attribute failed poll time */
> >                 if (vc->halt_poll_ns)
> > -                       vc->runner->stat.halt_poll_fail_ns +=
> > +                       vc->runner->stat.common.halt_poll_fail_ns +=
> >                                 ktime_to_ns(start_wait) -
> >                                 ktime_to_ns(start_poll);
> >         } else {
> >                 /* Attribute successful poll time */
> >                 if (vc->halt_poll_ns)
> > -                       vc->runner->stat.halt_poll_success_ns +=
> > +                       vc->runner->stat.common.halt_poll_success_ns +=
> >                                 ktime_to_ns(cur) -
> >                                 ktime_to_ns(start_poll);
> >         }
> > diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c
> > index d7733b07f489..214caa9d9675 100644
> > --- a/arch/powerpc/kvm/book3s_pr.c
> > +++ b/arch/powerpc/kvm/book3s_pr.c
> > @@ -493,7 +493,7 @@ static void kvmppc_set_msr_pr(struct kvm_vcpu *vcpu, u64 msr)
> >                 if (!vcpu->arch.pending_exceptions) {
> >                         kvm_vcpu_block(vcpu);
> >                         kvm_clear_request(KVM_REQ_UNHALT, vcpu);
> > -                       vcpu->stat.halt_wakeup++;
> > +                       vcpu->stat.common.halt_wakeup++;
> >
> >                         /* Unset POW bit after we woke up */
> >                         msr &= ~MSR_POW;
> > diff --git a/arch/powerpc/kvm/book3s_pr_papr.c b/arch/powerpc/kvm/book3s_pr_papr.c
> > index 031c8015864a..9384625c8051 100644
> > --- a/arch/powerpc/kvm/book3s_pr_papr.c
> > +++ b/arch/powerpc/kvm/book3s_pr_papr.c
> > @@ -378,7 +378,7 @@ int kvmppc_h_pr(struct kvm_vcpu *vcpu, unsigned long cmd)
> >                 kvmppc_set_msr_fast(vcpu, kvmppc_get_msr(vcpu) | MSR_EE);
> >                 kvm_vcpu_block(vcpu);
> >                 kvm_clear_request(KVM_REQ_UNHALT, vcpu);
> > -               vcpu->stat.halt_wakeup++;
> > +               vcpu->stat.common.halt_wakeup++;
> >                 return EMULATE_DONE;
> >         case H_LOGICAL_CI_LOAD:
> >                 return kvmppc_h_pr_logical_ci_load(vcpu);
> > diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
> > index 7d5fe43f85c4..07fdd7a1254a 100644
> > --- a/arch/powerpc/kvm/booke.c
> > +++ b/arch/powerpc/kvm/booke.c
> > @@ -49,15 +49,15 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
> >         VCPU_STAT("inst_emu", emulated_inst_exits),
> >         VCPU_STAT("dec", dec_exits),
> >         VCPU_STAT("ext_intr", ext_intr_exits),
> > -       VCPU_STAT("halt_successful_poll", halt_successful_poll),
> > -       VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> > -       VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> > -       VCPU_STAT("halt_wakeup", halt_wakeup),
> > +       VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> > +       VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> > +       VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> > +       VCPU_STAT_COM("halt_wakeup", halt_wakeup),
> >         VCPU_STAT("doorbell", dbell_exits),
> >         VCPU_STAT("guest doorbell", gdbell_exits),
> > -       VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> > -       VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> > -       VM_STAT("remote_tlb_flush", remote_tlb_flush),
> > +       VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> > +       VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
> > +       VM_STAT_COM("remote_tlb_flush", remote_tlb_flush),
> >         { NULL }
> >  };
> >
> > diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
> > index 8925f3969478..57a20897f3db 100644
> > --- a/arch/s390/include/asm/kvm_host.h
> > +++ b/arch/s390/include/asm/kvm_host.h
> > @@ -361,6 +361,7 @@ struct sie_page {
> >  };
> >
> >  struct kvm_vcpu_stat {
> > +       struct kvm_vcpu_stat_common common;
> >         u64 exit_userspace;
> >         u64 exit_null;
> >         u64 exit_external_request;
> > @@ -370,13 +371,7 @@ struct kvm_vcpu_stat {
> >         u64 exit_validity;
> >         u64 exit_instruction;
> >         u64 exit_pei;
> > -       u64 halt_successful_poll;
> > -       u64 halt_attempted_poll;
> > -       u64 halt_poll_invalid;
> >         u64 halt_no_poll_steal;
> > -       u64 halt_wakeup;
> > -       u64 halt_poll_success_ns;
> > -       u64 halt_poll_fail_ns;
> >         u64 instruction_lctl;
> >         u64 instruction_lctlg;
> >         u64 instruction_stctl;
> > @@ -755,12 +750,12 @@ struct kvm_vcpu_arch {
> >  };
> >
> >  struct kvm_vm_stat {
> > +       struct kvm_vm_stat_common common;
> >         u64 inject_io;
> >         u64 inject_float_mchk;
> >         u64 inject_pfault_done;
> >         u64 inject_service_signal;
> >         u64 inject_virtio;
> > -       u64 remote_tlb_flush;
> >  };
> >
> >  struct kvm_arch_memory_slot {
> > diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> > index 1296fc10f80c..d6bf3372bb10 100644
> > --- a/arch/s390/kvm/kvm-s390.c
> > +++ b/arch/s390/kvm/kvm-s390.c
> > @@ -72,13 +72,13 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
> >         VCPU_STAT("exit_program_interruption", exit_program_interruption),
> >         VCPU_STAT("exit_instr_and_program_int", exit_instr_and_program),
> >         VCPU_STAT("exit_operation_exception", exit_operation_exception),
> > -       VCPU_STAT("halt_successful_poll", halt_successful_poll),
> > -       VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> > -       VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> > +       VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> > +       VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> > +       VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> >         VCPU_STAT("halt_no_poll_steal", halt_no_poll_steal),
> > -       VCPU_STAT("halt_wakeup", halt_wakeup),
> > -       VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> > -       VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> > +       VCPU_STAT_COM("halt_wakeup", halt_wakeup),
> > +       VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> > +       VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
> >         VCPU_STAT("instruction_lctlg", instruction_lctlg),
> >         VCPU_STAT("instruction_lctl", instruction_lctl),
> >         VCPU_STAT("instruction_stctl", instruction_stctl),
> > diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
> > index 55efbacfc244..5bfd6893fbf6 100644
> > --- a/arch/x86/include/asm/kvm_host.h
> > +++ b/arch/x86/include/asm/kvm_host.h
> > @@ -1127,6 +1127,7 @@ struct kvm_arch {
> >  };
> >
> >  struct kvm_vm_stat {
> > +       struct kvm_vm_stat_common common;
> >         ulong mmu_shadow_zapped;
> >         ulong mmu_pte_write;
> >         ulong mmu_pde_zapped;
> > @@ -1134,13 +1135,13 @@ struct kvm_vm_stat {
> >         ulong mmu_recycled;
> >         ulong mmu_cache_miss;
> >         ulong mmu_unsync;
> > -       ulong remote_tlb_flush;
> >         ulong lpages;
> >         ulong nx_lpage_splits;
> >         ulong max_mmu_page_hash_collisions;
> >  };
> >
> >  struct kvm_vcpu_stat {
> > +       struct kvm_vcpu_stat_common common;
> >         u64 pf_fixed;
> >         u64 pf_guest;
> >         u64 tlb_flush;
> > @@ -1154,10 +1155,6 @@ struct kvm_vcpu_stat {
> >         u64 nmi_window_exits;
> >         u64 l1d_flush;
> >         u64 halt_exits;
> > -       u64 halt_successful_poll;
> > -       u64 halt_attempted_poll;
> > -       u64 halt_poll_invalid;
> > -       u64 halt_wakeup;
> >         u64 request_irq_exits;
> >         u64 irq_exits;
> >         u64 host_state_reload;
> > @@ -1168,8 +1165,6 @@ struct kvm_vcpu_stat {
> >         u64 irq_injections;
> >         u64 nmi_injections;
> >         u64 req_event;
> > -       u64 halt_poll_success_ns;
> > -       u64 halt_poll_fail_ns;
> >         u64 nested_run;
> >         u64 directed_yield_attempted;
> >         u64 directed_yield_successful;
> > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> > index 9b6bca616929..9a93d80caff6 100644
> > --- a/arch/x86/kvm/x86.c
> > +++ b/arch/x86/kvm/x86.c
> > @@ -226,10 +226,10 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
> >         VCPU_STAT("irq_window", irq_window_exits),
> >         VCPU_STAT("nmi_window", nmi_window_exits),
> >         VCPU_STAT("halt_exits", halt_exits),
> > -       VCPU_STAT("halt_successful_poll", halt_successful_poll),
> > -       VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> > -       VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> > -       VCPU_STAT("halt_wakeup", halt_wakeup),
> > +       VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> > +       VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> > +       VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> > +       VCPU_STAT_COM("halt_wakeup", halt_wakeup),
> >         VCPU_STAT("hypercalls", hypercalls),
> >         VCPU_STAT("request_irq", request_irq_exits),
> >         VCPU_STAT("irq_exits", irq_exits),
> > @@ -241,8 +241,8 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
> >         VCPU_STAT("nmi_injections", nmi_injections),
> >         VCPU_STAT("req_event", req_event),
> >         VCPU_STAT("l1d_flush", l1d_flush),
> > -       VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> > -       VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> > +       VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> > +       VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
> >         VCPU_STAT("nested_run", nested_run),
> >         VCPU_STAT("directed_yield_attempted", directed_yield_attempted),
> >         VCPU_STAT("directed_yield_successful", directed_yield_successful),
> > @@ -253,7 +253,7 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
> >         VM_STAT("mmu_recycled", mmu_recycled),
> >         VM_STAT("mmu_cache_miss", mmu_cache_miss),
> >         VM_STAT("mmu_unsync", mmu_unsync),
> > -       VM_STAT("remote_tlb_flush", remote_tlb_flush),
> > +       VM_STAT_COM("remote_tlb_flush", remote_tlb_flush),
> >         VM_STAT("largepages", lpages, .mode = 0444),
> >         VM_STAT("nx_largepages_splitted", nx_lpage_splits, .mode = 0444),
> >         VM_STAT("max_mmu_page_hash_collisions", max_mmu_page_hash_collisions),
> > diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> > index 2f34487e21f2..97700e41db3b 100644
> > --- a/include/linux/kvm_host.h
> > +++ b/include/linux/kvm_host.h
> > @@ -1243,10 +1243,15 @@ struct kvm_stats_debugfs_item {
> >  #define KVM_DBGFS_GET_MODE(dbgfs_item)                                         \
> >         ((dbgfs_item)->mode ? (dbgfs_item)->mode : 0644)
> >
> > -#define VM_STAT(n, x, ...)                                                     \
> > +#define VM_STAT(n, x, ...)                                                    \
> >         { n, offsetof(struct kvm, stat.x), KVM_STAT_VM, ## __VA_ARGS__ }
> > -#define VCPU_STAT(n, x, ...)                                                   \
> > +#define VCPU_STAT(n, x, ...)                                                  \
> >         { n, offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU, ## __VA_ARGS__ }
> > +#define VM_STAT_COM(n, x, ...)                                                \
> > +       { n, offsetof(struct kvm, stat.common.x), KVM_STAT_VM, ## __VA_ARGS__ }
> > +#define VCPU_STAT_COM(n, x, ...)                                              \
> > +       { n, offsetof(struct kvm_vcpu, stat.common.x),                         \
> > +         KVM_STAT_VCPU, ## __VA_ARGS__ }
> >
> >  extern struct kvm_stats_debugfs_item debugfs_entries[];
> >  extern struct dentry *kvm_debugfs_dir;
> > diff --git a/include/linux/kvm_types.h b/include/linux/kvm_types.h
> > index a7580f69dda0..87eb05ad678b 100644
> > --- a/include/linux/kvm_types.h
> > +++ b/include/linux/kvm_types.h
> > @@ -76,5 +76,17 @@ struct kvm_mmu_memory_cache {
> >  };
> >  #endif
> >
> > +struct kvm_vm_stat_common {
> > +       ulong remote_tlb_flush;
> > +};
> > +
> > +struct kvm_vcpu_stat_common {
> > +       u64 halt_successful_poll;
> > +       u64 halt_attempted_poll;
> > +       u64 halt_poll_invalid;
> > +       u64 halt_wakeup;
> > +       u64 halt_poll_success_ns;
> > +       u64 halt_poll_fail_ns;
> > +};
> >
> >  #endif /* __KVM_TYPES_H__ */
> > diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> > index 6b4feb92dc79..34a4cf265297 100644
> > --- a/virt/kvm/kvm_main.c
> > +++ b/virt/kvm/kvm_main.c
> > @@ -330,7 +330,7 @@ void kvm_flush_remote_tlbs(struct kvm *kvm)
> >          */
> >         if (!kvm_arch_flush_remote_tlb(kvm)
> >             || kvm_make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
> > -               ++kvm->stat.remote_tlb_flush;
> > +               ++kvm->stat.common.remote_tlb_flush;
> >         cmpxchg(&kvm->tlbs_dirty, dirty_count, 0);
> >  }
> >  EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs);
> > @@ -2940,9 +2940,9 @@ static inline void
> >  update_halt_poll_stats(struct kvm_vcpu *vcpu, u64 poll_ns, bool waited)
> >  {
> >         if (waited)
> > -               vcpu->stat.halt_poll_fail_ns += poll_ns;
> > +               vcpu->stat.common.halt_poll_fail_ns += poll_ns;
> >         else
> > -               vcpu->stat.halt_poll_success_ns += poll_ns;
> > +               vcpu->stat.common.halt_poll_success_ns += poll_ns;
> >  }
> >
> >  /*
> > @@ -2960,16 +2960,16 @@ void kvm_vcpu_block(struct kvm_vcpu *vcpu)
> >         if (vcpu->halt_poll_ns && !kvm_arch_no_poll(vcpu)) {
> >                 ktime_t stop = ktime_add_ns(ktime_get(), vcpu->halt_poll_ns);
> >
> > -               ++vcpu->stat.halt_attempted_poll;
> > +               ++vcpu->stat.common.halt_attempted_poll;
> >                 do {
> >                         /*
> >                          * This sets KVM_REQ_UNHALT if an interrupt
> >                          * arrives.
> >                          */
> >                         if (kvm_vcpu_check_block(vcpu) < 0) {
> > -                               ++vcpu->stat.halt_successful_poll;
> > +                               ++vcpu->stat.common.halt_successful_poll;
> >                                 if (!vcpu_valid_wakeup(vcpu))
> > -                                       ++vcpu->stat.halt_poll_invalid;
> > +                                       ++vcpu->stat.common.halt_poll_invalid;
> >                                 goto out;
> >                         }
> >                         poll_end = cur = ktime_get();
> > @@ -3027,7 +3027,7 @@ bool kvm_vcpu_wake_up(struct kvm_vcpu *vcpu)
> >         waitp = kvm_arch_vcpu_get_wait(vcpu);
> >         if (rcuwait_wake_up(waitp)) {
> >                 WRITE_ONCE(vcpu->ready, true);
> > -               ++vcpu->stat.halt_wakeup;
> > +               ++vcpu->stat.common.halt_wakeup;
> >                 return true;
> >         }
> >
> > --
> > 2.31.1.818.g46aad6cb9e-goog
> >
Thanks David!

Jing
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kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

[PATCH v6 2/4] KVM: stats: Add fd-based API to read binary stats data

[Jing Zhang]

Provides a file descriptor per VM to read VM stats info/data.
Provides a file descriptor per vCPU to read vCPU stats info/data.

Reviewed-by: David Matlack <dmatlack@google.com>
Reviewed-by: Ricardo Koller <ricarkol@google.com>
Signed-off-by: Jing Zhang <jingzhangos@google.com>
---
 arch/arm64/kvm/guest.c    |  26 ++++++
 arch/mips/kvm/mips.c      |  52 ++++++++++++
 arch/powerpc/kvm/book3s.c |  52 ++++++++++++
 arch/powerpc/kvm/booke.c  |  45 +++++++++++
 arch/s390/kvm/kvm-s390.c  | 117 +++++++++++++++++++++++++++
 arch/x86/kvm/x86.c        |  53 ++++++++++++
 include/linux/kvm_host.h  | 132 ++++++++++++++++++++++++++++++
 include/uapi/linux/kvm.h  |  50 ++++++++++++
 virt/kvm/kvm_main.c       | 165 ++++++++++++++++++++++++++++++++++++++
 9 files changed, 692 insertions(+)

diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
index 0e41331b0911..1cc1d83630ac 100644
--- a/arch/arm64/kvm/guest.c
+++ b/arch/arm64/kvm/guest.c
@@ -28,6 +28,32 @@
 
 #include "trace.h"
 
+struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC();
+
+struct _kvm_stats_header kvm_vm_stats_header = {
+	.name_size = KVM_STATS_NAME_LEN,
+	.count = ARRAY_SIZE(kvm_vm_stats_desc),
+	.desc_offset = sizeof(struct kvm_stats_header),
+	.data_offset = sizeof(struct kvm_stats_header) +
+		sizeof(kvm_vm_stats_desc),
+};
+
+struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
+	STATS_DESC_COUNTER("hvc_exit_stat"),
+	STATS_DESC_COUNTER("wfe_exit_stat"),
+	STATS_DESC_COUNTER("wfi_exit_stat"),
+	STATS_DESC_COUNTER("mmio_exit_user"),
+	STATS_DESC_COUNTER("mmio_exit_kernel"),
+	STATS_DESC_COUNTER("exits"));
+
+struct _kvm_stats_header kvm_vcpu_stats_header = {
+	.name_size = KVM_STATS_NAME_LEN,
+	.count = ARRAY_SIZE(kvm_vcpu_stats_desc),
+	.desc_offset = sizeof(struct kvm_stats_header),
+	.data_offset = sizeof(struct kvm_stats_header) +
+		sizeof(kvm_vcpu_stats_desc),
+};
+
 struct kvm_stats_debugfs_item debugfs_entries[] = {
 	VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
 	VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
index f4fc60c05e9c..f17a65743ccd 100644
--- a/arch/mips/kvm/mips.c
+++ b/arch/mips/kvm/mips.c
@@ -38,6 +38,58 @@
 #define VECTORSPACING 0x100	/* for EI/VI mode */
 #endif
 
+struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC();
+
+struct _kvm_stats_header kvm_vm_stats_header = {
+	.name_size = KVM_STATS_NAME_LEN,
+	.count = ARRAY_SIZE(kvm_vm_stats_desc),
+	.desc_offset = sizeof(struct kvm_stats_header),
+	.data_offset = sizeof(struct kvm_stats_header) +
+		sizeof(kvm_vm_stats_desc),
+};
+
+struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
+	STATS_DESC_COUNTER("wait_exits"),
+	STATS_DESC_COUNTER("cache_exits"),
+	STATS_DESC_COUNTER("signal_exits"),
+	STATS_DESC_COUNTER("int_exits"),
+	STATS_DESC_COUNTER("cop_unusable_exits"),
+	STATS_DESC_COUNTER("tlbmod_exits"),
+	STATS_DESC_COUNTER("tlbmiss_ld_exits"),
+	STATS_DESC_COUNTER("tlbmiss_st_exits"),
+	STATS_DESC_COUNTER("addrerr_st_exits"),
+	STATS_DESC_COUNTER("addrerr_ld_exits"),
+	STATS_DESC_COUNTER("syscall_exits"),
+	STATS_DESC_COUNTER("resvd_inst_exits"),
+	STATS_DESC_COUNTER("break_inst_exits"),
+	STATS_DESC_COUNTER("trap_inst_exits"),
+	STATS_DESC_COUNTER("msa_fpe_exits"),
+	STATS_DESC_COUNTER("fpe_exits"),
+	STATS_DESC_COUNTER("msa_disabled_exits"),
+	STATS_DESC_COUNTER("flush_dcache_exits"),
+#ifdef CONFIG_KVM_MIPS_VZ
+	STATS_DESC_COUNTER("vz_gpsi_exits"),
+	STATS_DESC_COUNTER("vz_gsfc_exits"),
+	STATS_DESC_COUNTER("vz_hc_exits"),
+	STATS_DESC_COUNTER("vz_grr_exits"),
+	STATS_DESC_COUNTER("vz_gva_exits"),
+	STATS_DESC_COUNTER("vz_ghfc_exits"),
+	STATS_DESC_COUNTER("vz_gpa_exits"),
+	STATS_DESC_COUNTER("vz_resvd_exits"),
+#ifdef CONFIG_CPU_LOONGSON64
+	STATS_DESC_COUNTER("vz_cpucfg_exits"),
+#endif
+#endif
+	);
+
+struct _kvm_stats_header kvm_vcpu_stats_header = {
+	.name_size = KVM_STATS_NAME_LEN,
+	.count = ARRAY_SIZE(kvm_vcpu_stats_desc),
+	.desc_offset = sizeof(struct kvm_stats_header),
+	.data_offset = sizeof(struct kvm_stats_header) +
+		sizeof(kvm_vcpu_stats_desc),
+};
+
 struct kvm_stats_debugfs_item debugfs_entries[] = {
 	VCPU_STAT("wait", wait_exits),
 	VCPU_STAT("cache", cache_exits),
diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
index bd3a10e1fdaf..5e8ee0d39ef9 100644
--- a/arch/powerpc/kvm/book3s.c
+++ b/arch/powerpc/kvm/book3s.c
@@ -38,6 +38,58 @@
 
 /* #define EXIT_DEBUG */
 
+struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(
+	STATS_DESC_ICOUNTER("num_2M_pages"),
+	STATS_DESC_ICOUNTER("num_1G_pages"));
+
+struct _kvm_stats_header kvm_vm_stats_header = {
+	.name_size = KVM_STATS_NAME_LEN,
+	.count = ARRAY_SIZE(kvm_vm_stats_desc),
+	.desc_offset = sizeof(struct kvm_stats_header),
+	.data_offset = sizeof(struct kvm_stats_header) +
+		sizeof(kvm_vm_stats_desc),
+};
+
+struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
+	STATS_DESC_COUNTER("sum_exits"),
+	STATS_DESC_COUNTER("mmio_exits"),
+	STATS_DESC_COUNTER("signal_exits"),
+	STATS_DESC_COUNTER("light_exits"),
+	STATS_DESC_COUNTER("itlb_real_miss_exits"),
+	STATS_DESC_COUNTER("itlb_virt_miss_exits"),
+	STATS_DESC_COUNTER("dtlb_real_miss_exits"),
+	STATS_DESC_COUNTER("dtlb_virt_miss_exits"),
+	STATS_DESC_COUNTER("syscall_exits"),
+	STATS_DESC_COUNTER("isi_exits"),
+	STATS_DESC_COUNTER("dsi_exits"),
+	STATS_DESC_COUNTER("emulated_inst_exits"),
+	STATS_DESC_COUNTER("dec_exits"),
+	STATS_DESC_COUNTER("ext_intr_exits"),
+	STATS_DESC_TIME_NSEC("halt_wait_ns"),
+	STATS_DESC_COUNTER("halt_successful_wait"),
+	STATS_DESC_COUNTER("dbell_exits"),
+	STATS_DESC_COUNTER("gdbell_exits"),
+	STATS_DESC_COUNTER("ld"),
+	STATS_DESC_COUNTER("st"),
+	STATS_DESC_COUNTER("pf_storage"),
+	STATS_DESC_COUNTER("pf_instruc"),
+	STATS_DESC_COUNTER("sp_storage"),
+	STATS_DESC_COUNTER("sp_instruc"),
+	STATS_DESC_COUNTER("queue_intr"),
+	STATS_DESC_COUNTER("ld_slow"),
+	STATS_DESC_COUNTER("st_slow"),
+	STATS_DESC_COUNTER("pthru_all"),
+	STATS_DESC_COUNTER("pthru_host"),
+	STATS_DESC_COUNTER("pthru_bad_aff"));
+
+struct _kvm_stats_header kvm_vcpu_stats_header = {
+	.name_size = KVM_STATS_NAME_LEN,
+	.count = ARRAY_SIZE(kvm_vcpu_stats_desc),
+	.desc_offset = sizeof(struct kvm_stats_header),
+	.data_offset = sizeof(struct kvm_stats_header) +
+		sizeof(kvm_vcpu_stats_desc),
+};
+
 struct kvm_stats_debugfs_item debugfs_entries[] = {
 	VCPU_STAT("exits", sum_exits),
 	VCPU_STAT("mmio", mmio_exits),
diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
index 07fdd7a1254a..86d221e9193e 100644
--- a/arch/powerpc/kvm/booke.c
+++ b/arch/powerpc/kvm/booke.c
@@ -36,6 +36,51 @@
 
 unsigned long kvmppc_booke_handlers;
 
+struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(
+	STATS_DESC_ICOUNTER("num_2M_pages"),
+	STATS_DESC_ICOUNTER("num_1G_pages"));
+
+struct _kvm_stats_header kvm_vm_stats_header = {
+	.name_size = KVM_STATS_NAME_LEN,
+	.count = ARRAY_SIZE(kvm_vm_stats_desc),
+	.desc_offset = sizeof(struct kvm_stats_header),
+	.data_offset = sizeof(struct kvm_stats_header) +
+		sizeof(kvm_vm_stats_desc),
+};
+
+struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
+	STATS_DESC_COUNTER("sum_exits"),
+	STATS_DESC_COUNTER("mmio_exits"),
+	STATS_DESC_COUNTER("signal_exits"),
+	STATS_DESC_COUNTER("light_exits"),
+	STATS_DESC_COUNTER("itlb_real_miss_exits"),
+	STATS_DESC_COUNTER("itlb_virt_miss_exits"),
+	STATS_DESC_COUNTER("dtlb_real_miss_exits"),
+	STATS_DESC_COUNTER("dtlb_virt_miss_exits"),
+	STATS_DESC_COUNTER("syscall_exits"),
+	STATS_DESC_COUNTER("isi_exits"),
+	STATS_DESC_COUNTER("dsi_exits"),
+	STATS_DESC_COUNTER("emulated_inst_exits"),
+	STATS_DESC_COUNTER("dec_exits"),
+	STATS_DESC_COUNTER("ext_intr_exits"),
+	STATS_DESC_TIME_NSEC("halt_wait_ns"),
+	STATS_DESC_COUNTER("halt_successful_wait"),
+	STATS_DESC_COUNTER("dbell_exits"),
+	STATS_DESC_COUNTER("gdbell_exits"),
+	STATS_DESC_COUNTER("ld"),
+	STATS_DESC_COUNTER("st"),
+	STATS_DESC_COUNTER("pthru_all"),
+	STATS_DESC_COUNTER("pthru_host"),
+	STATS_DESC_COUNTER("pthru_bad_aff"));
+
+struct _kvm_stats_header kvm_vcpu_stats_header = {
+	.name_size = KVM_STATS_NAME_LEN,
+	.count = ARRAY_SIZE(kvm_vcpu_stats_desc),
+	.desc_offset = sizeof(struct kvm_stats_header),
+	.data_offset = sizeof(struct kvm_stats_header) +
+		sizeof(kvm_vcpu_stats_desc),
+};
+
 struct kvm_stats_debugfs_item debugfs_entries[] = {
 	VCPU_STAT("mmio", mmio_exits),
 	VCPU_STAT("sig", signal_exits),
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index d6bf3372bb10..003feee79fce 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -58,6 +58,123 @@
 #define VCPU_IRQS_MAX_BUF (sizeof(struct kvm_s390_irq) * \
 			   (KVM_MAX_VCPUS + LOCAL_IRQS))
 
+struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(
+	STATS_DESC_COUNTER("inject_io"),
+	STATS_DESC_COUNTER("inject_float_mchk"),
+	STATS_DESC_COUNTER("inject_pfault_done"),
+	STATS_DESC_COUNTER("inject_service_signal"),
+	STATS_DESC_COUNTER("inject_virtio"));
+
+struct _kvm_stats_header kvm_vm_stats_header = {
+	.name_size = KVM_STATS_NAME_LEN,
+	.count = ARRAY_SIZE(kvm_vm_stats_desc),
+	.desc_offset = sizeof(struct kvm_stats_header),
+	.data_offset = sizeof(struct kvm_stats_header) +
+		sizeof(kvm_vm_stats_desc),
+};
+
+struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
+	STATS_DESC_COUNTER("exit_userspace"),
+	STATS_DESC_COUNTER("exit_null"),
+	STATS_DESC_COUNTER("exit_external_request"),
+	STATS_DESC_COUNTER("exit_io_request"),
+	STATS_DESC_COUNTER("exit_external_interrupt"),
+	STATS_DESC_COUNTER("exit_stop_request"),
+	STATS_DESC_COUNTER("exit_validity"),
+	STATS_DESC_COUNTER("exit_instruction"),
+	STATS_DESC_COUNTER("exit_pei"),
+	STATS_DESC_COUNTER("halt_no_poll_steal"),
+	STATS_DESC_COUNTER("instruction_lctl"),
+	STATS_DESC_COUNTER("instruction_lctlg"),
+	STATS_DESC_COUNTER("instruction_stctl"),
+	STATS_DESC_COUNTER("instruction_stctg"),
+	STATS_DESC_COUNTER("exit_program_interruption"),
+	STATS_DESC_COUNTER("exit_instr_and_program"),
+	STATS_DESC_COUNTER("exit_operation_exception"),
+	STATS_DESC_COUNTER("deliver_ckc"),
+	STATS_DESC_COUNTER("deliver_cputm"),
+	STATS_DESC_COUNTER("deliver_external_call"),
+	STATS_DESC_COUNTER("deliver_emergency_signal"),
+	STATS_DESC_COUNTER("deliver_service_signal"),
+	STATS_DESC_COUNTER("deliver_virtio"),
+	STATS_DESC_COUNTER("deliver_stop_signal"),
+	STATS_DESC_COUNTER("deliver_prefix_signal"),
+	STATS_DESC_COUNTER("deliver_restart_signal"),
+	STATS_DESC_COUNTER("deliver_program"),
+	STATS_DESC_COUNTER("deliver_io"),
+	STATS_DESC_COUNTER("deliver_machine_check"),
+	STATS_DESC_COUNTER("exit_wait_state"),
+	STATS_DESC_COUNTER("inject_ckc"),
+	STATS_DESC_COUNTER("inject_cputm"),
+	STATS_DESC_COUNTER("inject_external_call"),
+	STATS_DESC_COUNTER("inject_emergency_signal"),
+	STATS_DESC_COUNTER("inject_mchk"),
+	STATS_DESC_COUNTER("inject_pfault_init"),
+	STATS_DESC_COUNTER("inject_program"),
+	STATS_DESC_COUNTER("inject_restart"),
+	STATS_DESC_COUNTER("inject_set_prefix"),
+	STATS_DESC_COUNTER("inject_stop_signal"),
+	STATS_DESC_COUNTER("instruction_epsw"),
+	STATS_DESC_COUNTER("instruction_gs"),
+	STATS_DESC_COUNTER("instruction_io_other"),
+	STATS_DESC_COUNTER("instruction_lpsw"),
+	STATS_DESC_COUNTER("instruction_lpswe"),
+	STATS_DESC_COUNTER("instruction_pfmf"),
+	STATS_DESC_COUNTER("instruction_ptff"),
+	STATS_DESC_COUNTER("instruction_sck"),
+	STATS_DESC_COUNTER("instruction_sckpf"),
+	STATS_DESC_COUNTER("instruction_stidp"),
+	STATS_DESC_COUNTER("instruction_spx"),
+	STATS_DESC_COUNTER("instruction_stpx"),
+	STATS_DESC_COUNTER("instruction_stap"),
+	STATS_DESC_COUNTER("instruction_iske"),
+	STATS_DESC_COUNTER("instruction_ri"),
+	STATS_DESC_COUNTER("instruction_rrbe"),
+	STATS_DESC_COUNTER("instruction_sske"),
+	STATS_DESC_COUNTER("instruction_ipte_interlock"),
+	STATS_DESC_COUNTER("instruction_stsi"),
+	STATS_DESC_COUNTER("instruction_stfl"),
+	STATS_DESC_COUNTER("instruction_tb"),
+	STATS_DESC_COUNTER("instruction_tpi"),
+	STATS_DESC_COUNTER("instruction_tprot"),
+	STATS_DESC_COUNTER("instruction_tsch"),
+	STATS_DESC_COUNTER("instruction_sie"),
+	STATS_DESC_COUNTER("instruction_essa"),
+	STATS_DESC_COUNTER("instruction_sthyi"),
+	STATS_DESC_COUNTER("instruction_sigp_sense"),
+	STATS_DESC_COUNTER("instruction_sigp_sense_running"),
+	STATS_DESC_COUNTER("instruction_sigp_external_call"),
+	STATS_DESC_COUNTER("instruction_sigp_emergency"),
+	STATS_DESC_COUNTER("instruction_sigp_cond_emergency"),
+	STATS_DESC_COUNTER("instruction_sigp_start"),
+	STATS_DESC_COUNTER("instruction_sigp_stop"),
+	STATS_DESC_COUNTER("instruction_sigp_stop_store_status"),
+	STATS_DESC_COUNTER("instruction_sigp_store_status"),
+	STATS_DESC_COUNTER("instruction_sigp_store_adtl_status"),
+	STATS_DESC_COUNTER("instruction_sigp_arch"),
+	STATS_DESC_COUNTER("instruction_sigp_prefix"),
+	STATS_DESC_COUNTER("instruction_sigp_restart"),
+	STATS_DESC_COUNTER("instruction_sigp_init_cpu_reset"),
+	STATS_DESC_COUNTER("instruction_sigp_cpu_reset"),
+	STATS_DESC_COUNTER("instruction_sigp_unknown"),
+	STATS_DESC_COUNTER("diagnose_10"),
+	STATS_DESC_COUNTER("diagnose_44"),
+	STATS_DESC_COUNTER("diagnose_9c"),
+	STATS_DESC_COUNTER("diagnose_9c_ignored"),
+	STATS_DESC_COUNTER("diagnose_258"),
+	STATS_DESC_COUNTER("diagnose_308"),
+	STATS_DESC_COUNTER("diagnose_500"),
+	STATS_DESC_COUNTER("diagnose_other"),
+	STATS_DESC_COUNTER("pfault_sync"));
+
+struct _kvm_stats_header kvm_vcpu_stats_header = {
+	.name_size = KVM_STATS_NAME_LEN,
+	.count = ARRAY_SIZE(kvm_vcpu_stats_desc),
+	.desc_offset = sizeof(struct kvm_stats_header),
+	.data_offset = sizeof(struct kvm_stats_header) +
+		sizeof(kvm_vcpu_stats_desc),
+};
+
 struct kvm_stats_debugfs_item debugfs_entries[] = {
 	VCPU_STAT("userspace_handled", exit_userspace),
 	VCPU_STAT("exit_null", exit_null),
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 9a93d80caff6..84880687c199 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -214,6 +214,59 @@ EXPORT_SYMBOL_GPL(host_xss);
 u64 __read_mostly supported_xss;
 EXPORT_SYMBOL_GPL(supported_xss);
 
+struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(
+	STATS_DESC_COUNTER("mmu_shadow_zapped"),
+	STATS_DESC_COUNTER("mmu_pte_write"),
+	STATS_DESC_COUNTER("mmu_pde_zapped"),
+	STATS_DESC_COUNTER("mmu_flooded"),
+	STATS_DESC_COUNTER("mmu_recycled"),
+	STATS_DESC_COUNTER("mmu_cache_miss"),
+	STATS_DESC_ICOUNTER("mmu_unsync"),
+	STATS_DESC_ICOUNTER("largepages"),
+	STATS_DESC_ICOUNTER("nx_largepages_splits"),
+	STATS_DESC_ICOUNTER("max_mmu_page_hash_collisions"));
+
+struct _kvm_stats_header kvm_vm_stats_header = {
+	.name_size = KVM_STATS_NAME_LEN,
+	.count = ARRAY_SIZE(kvm_vm_stats_desc),
+	.desc_offset = sizeof(struct kvm_stats_header),
+	.data_offset = sizeof(struct kvm_stats_header) +
+		sizeof(kvm_vm_stats_desc),
+};
+
+struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
+	STATS_DESC_COUNTER("pf_fixed"),
+	STATS_DESC_COUNTER("pf_guest"),
+	STATS_DESC_COUNTER("tlb_flush"),
+	STATS_DESC_COUNTER("invlpg"),
+	STATS_DESC_COUNTER("exits"),
+	STATS_DESC_COUNTER("io_exits"),
+	STATS_DESC_COUNTER("mmio_exits"),
+	STATS_DESC_COUNTER("signal_exits"),
+	STATS_DESC_COUNTER("irq_window_exits"),
+	STATS_DESC_COUNTER("nmi_window_exits"),
+	STATS_DESC_COUNTER("l1d_flush"),
+	STATS_DESC_COUNTER("halt_exits"),
+	STATS_DESC_COUNTER("request_irq_exits"),
+	STATS_DESC_COUNTER("irq_exits"),
+	STATS_DESC_COUNTER("host_state_reload"),
+	STATS_DESC_COUNTER("fpu_reload"),
+	STATS_DESC_COUNTER("insn_emulation"),
+	STATS_DESC_COUNTER("insn_emulation_fail"),
+	STATS_DESC_COUNTER("hypercalls"),
+	STATS_DESC_COUNTER("irq_injections"),
+	STATS_DESC_COUNTER("nmi_injections"),
+	STATS_DESC_COUNTER("req_event"),
+	STATS_DESC_COUNTER("nested_run"));
+
+struct _kvm_stats_header kvm_vcpu_stats_header = {
+	.name_size = KVM_STATS_NAME_LEN,
+	.count = ARRAY_SIZE(kvm_vcpu_stats_desc),
+	.desc_offset = sizeof(struct kvm_stats_header),
+	.data_offset = sizeof(struct kvm_stats_header) +
+		sizeof(kvm_vcpu_stats_desc),
+};
+
 struct kvm_stats_debugfs_item debugfs_entries[] = {
 	VCPU_STAT("pf_fixed", pf_fixed),
 	VCPU_STAT("pf_guest", pf_guest),
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 97700e41db3b..c0a8e6ddc745 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -1240,6 +1240,19 @@ struct kvm_stats_debugfs_item {
 	int mode;
 };
 
+struct _kvm_stats_header {
+	__u32 name_size;
+	__u32 count;
+	__u32 desc_offset;
+	__u32 data_offset;
+};
+
+#define KVM_STATS_NAME_LEN	48
+struct _kvm_stats_desc {
+	struct kvm_stats_desc desc;
+	char name[KVM_STATS_NAME_LEN];
+};
+
 #define KVM_DBGFS_GET_MODE(dbgfs_item)                                         \
 	((dbgfs_item)->mode ? (dbgfs_item)->mode : 0644)
 
@@ -1253,8 +1266,127 @@ struct kvm_stats_debugfs_item {
 	{ n, offsetof(struct kvm_vcpu, stat.common.x),			       \
 	  KVM_STAT_VCPU, ## __VA_ARGS__ }
 
+#define STATS_DESC(stat, type, unit, scale, exp)			       \
+	{								       \
+		{							       \
+			.flags = type | unit | scale,			       \
+			.exponent = exp,				       \
+			.size = 1					       \
+		},							       \
+		.name = stat,						       \
+	}
+#define STATS_DESC_CUMULATIVE(name, unit, scale, exponent)		       \
+	STATS_DESC(name, KVM_STATS_TYPE_CUMULATIVE, unit, scale, exponent)
+#define STATS_DESC_INSTANT(name, unit, scale, exponent)			       \
+	STATS_DESC(name, KVM_STATS_TYPE_INSTANT, unit, scale, exponent)
+
+/* Cumulative counter */
+#define STATS_DESC_COUNTER(name)					       \
+	STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_NONE,		       \
+		KVM_STATS_BASE_POW10, 0)
+/* Instantaneous counter */
+#define STATS_DESC_ICOUNTER(name)					       \
+	STATS_DESC_INSTANT(name, KVM_STATS_UNIT_NONE,			       \
+		KVM_STATS_BASE_POW10, 0)
+
+/* Cumulative clock cycles */
+#define STATS_DESC_CYCLE(name)						       \
+	STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_CYCLES,		       \
+		KVM_STATS_BASE_POW10, 0)
+/* Instantaneous clock cycles */
+#define STATS_DESC_ICYCLE(name)						       \
+	STATS_DESC_INSTANT(name, KVM_STATS_UNIT_CYCLES,			       \
+		KVM_STATS_BASE_POW10, 0)
+
+/* Cumulative memory size in Byte */
+#define STATS_DESC_SIZE_BYTE(name)					       \
+	STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES,		       \
+		KVM_STATS_BASE_POW2, 0)
+/* Cumulative memory size in KiByte */
+#define STATS_DESC_SIZE_KBYTE(name)					       \
+	STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES,		       \
+		KVM_STATS_BASE_POW2, 10)
+/* Cumulative memory size in MiByte */
+#define STATS_DESC_SIZE_MBYTE(name)					       \
+	STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES,		       \
+		KVM_STATS_BASE_POW2, 20)
+/* Cumulative memory size in GiByte */
+#define STATS_DESC_SIZE_GBYTE(name)					       \
+	STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES,		       \
+		KVM_STATS_BASE_POW2, 30)
+
+/* Instantaneous memory size in Byte */
+#define STATS_DESC_ISIZE_BYTE(name)					       \
+	STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES,			       \
+		KVM_STATS_BASE_POW2, 0)
+/* Instantaneous memory size in KiByte */
+#define STATS_DESC_ISIZE_KBYTE(name)					       \
+	STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES,			       \
+		KVM_STATS_BASE_POW2, 10)
+/* Instantaneous memory size in MiByte */
+#define STATS_DESC_ISIZE_MBYTE(name)					       \
+	STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES,			       \
+		KVM_STATS_BASE_POW2, 20)
+/* Instantaneous memory size in GiByte */
+#define STATS_DESC_ISIZE_GBYTE(name)					       \
+	STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES,			       \
+		KVM_STATS_BASE_POW2, 30)
+
+/* Cumulative time in second */
+#define STATS_DESC_TIME_SEC(name)					       \
+	STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS,		       \
+		KVM_STATS_BASE_POW10, 0)
+/* Cumulative time in millisecond */
+#define STATS_DESC_TIME_MSEC(name)					       \
+	STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS,		       \
+		KVM_STATS_BASE_POW10, -3)
+/* Cumulative time in microsecond */
+#define STATS_DESC_TIME_USEC(name)					       \
+	STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS,		       \
+		KVM_STATS_BASE_POW10, -6)
+/* Cumulative time in nanosecond */
+#define STATS_DESC_TIME_NSEC(name)					       \
+	STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS,		       \
+		KVM_STATS_BASE_POW10, -9)
+
+/* Instantaneous time in second */
+#define STATS_DESC_ITIME_SEC(name)					       \
+	STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS,		       \
+		KVM_STATS_BASE_POW10, 0)
+/* Instantaneous time in millisecond */
+#define STATS_DESC_ITIME_MSEC(name)					       \
+	STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS,		       \
+		KVM_STATS_BASE_POW10, -3)
+/* Instantaneous time in microsecond */
+#define STATS_DESC_ITIME_USEC(name)					       \
+	STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS,		       \
+		KVM_STATS_BASE_POW10, -6)
+/* Instantaneous time in nanosecond */
+#define STATS_DESC_ITIME_NSEC(name)					       \
+	STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS,		       \
+		KVM_STATS_BASE_POW10, -9)
+
+#define DEFINE_VM_STATS_DESC(...) {					       \
+	STATS_DESC_COUNTER("remote_tlb_flush"),				       \
+	## __VA_ARGS__							       \
+}
+
+#define DEFINE_VCPU_STATS_DESC(...) {					       \
+	STATS_DESC_COUNTER("halt_successful_poll"),			       \
+	STATS_DESC_COUNTER("halt_attempted_poll"),			       \
+	STATS_DESC_COUNTER("halt_poll_invalid"),			       \
+	STATS_DESC_COUNTER("halt_wakeup"),				       \
+	STATS_DESC_TIME_NSEC("halt_poll_success_ns"),			       \
+	STATS_DESC_TIME_NSEC("halt_poll_fail_ns"),			       \
+	## __VA_ARGS__							       \
+}
+
 extern struct kvm_stats_debugfs_item debugfs_entries[];
 extern struct dentry *kvm_debugfs_dir;
+extern struct _kvm_stats_header kvm_vm_stats_header;
+extern struct _kvm_stats_header kvm_vcpu_stats_header;
+extern struct _kvm_stats_desc kvm_vm_stats_desc[];
+extern struct _kvm_stats_desc kvm_vcpu_stats_desc[];
 
 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
 static inline int mmu_notifier_retry(struct kvm *kvm, unsigned long mmu_seq)
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 3fd9a7e9d90c..82db825c392c 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -1082,6 +1082,7 @@ struct kvm_ppc_resize_hpt {
 #define KVM_CAP_SGX_ATTRIBUTE 196
 #define KVM_CAP_VM_COPY_ENC_CONTEXT_FROM 197
 #define KVM_CAP_PTP_KVM 198
+#define KVM_CAP_STATS_BINARY_FD 199
 
 #ifdef KVM_CAP_IRQ_ROUTING
 
@@ -1898,4 +1899,53 @@ struct kvm_dirty_gfn {
 #define KVM_BUS_LOCK_DETECTION_OFF             (1 << 0)
 #define KVM_BUS_LOCK_DETECTION_EXIT            (1 << 1)
 
+#define KVM_STATS_ID_MAXLEN		64
+
+struct kvm_stats_header {
+	char id[KVM_STATS_ID_MAXLEN];
+	__u32 name_size;
+	__u32 count;
+	__u32 desc_offset;
+	__u32 data_offset;
+};
+
+#define KVM_STATS_TYPE_SHIFT		0
+#define KVM_STATS_TYPE_MASK		(0xF << KVM_STATS_TYPE_SHIFT)
+#define KVM_STATS_TYPE_CUMULATIVE	(0x0 << KVM_STATS_TYPE_SHIFT)
+#define KVM_STATS_TYPE_INSTANT		(0x1 << KVM_STATS_TYPE_SHIFT)
+#define KVM_STATS_TYPE_MAX		KVM_STATS_TYPE_INSTANT
+
+#define KVM_STATS_UNIT_SHIFT		4
+#define KVM_STATS_UNIT_MASK		(0xF << KVM_STATS_UNIT_SHIFT)
+#define KVM_STATS_UNIT_NONE		(0x0 << KVM_STATS_UNIT_SHIFT)
+#define KVM_STATS_UNIT_BYTES		(0x1 << KVM_STATS_UNIT_SHIFT)
+#define KVM_STATS_UNIT_SECONDS		(0x2 << KVM_STATS_UNIT_SHIFT)
+#define KVM_STATS_UNIT_CYCLES		(0x3 << KVM_STATS_UNIT_SHIFT)
+#define KVM_STATS_UNIT_MAX		KVM_STATS_UNIT_CYCLES
+
+#define KVM_STATS_BASE_SHIFT		8
+#define KVM_STATS_BASE_MASK		(0xF << KVM_STATS_BASE_SHIFT)
+#define KVM_STATS_BASE_POW10		(0x0 << KVM_STATS_BASE_SHIFT)
+#define KVM_STATS_BASE_POW2		(0x1 << KVM_STATS_BASE_SHIFT)
+#define KVM_STATS_BASE_MAX		KVM_STATS_BASE_POW2
+
+struct kvm_stats_desc {
+	__u32 flags;
+	__s16 exponent;
+	__u16 size;
+	__u32 unused1;
+	__u32 unused2;
+	char name[0];
+};
+
+struct kvm_vm_stats_data {
+	unsigned long value[0];
+};
+
+struct kvm_vcpu_stats_data {
+	__u64 value[0];
+};
+
+#define KVM_STATS_GETFD  _IOR(KVMIO,  0xcc, struct kvm_stats_header)
+
 #endif /* __LINUX_KVM_H */
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 34a4cf265297..9e20e2ff78b4 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -3409,6 +3409,120 @@ static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
 	return 0;
 }
 
+static ssize_t kvm_stats_read(char *id, struct _kvm_stats_header *header,
+		struct _kvm_stats_desc *desc, void *stats, size_t size_stats,
+		char __user *user_buffer, size_t size, loff_t *offset)
+{
+	ssize_t copylen, len, remain = size;
+	size_t size_header, size_desc;
+	loff_t pos = *offset;
+	char __user *dest = user_buffer;
+	void *src;
+
+	size_header = sizeof(*header);
+	size_desc = header->count * sizeof(*desc);
+
+	len = KVM_STATS_ID_MAXLEN + size_header + size_desc + size_stats - pos;
+	len = min(len, remain);
+	if (len <= 0)
+		return 0;
+	remain = len;
+
+	/* Copy kvm stats header id string */
+	copylen = KVM_STATS_ID_MAXLEN - pos;
+	copylen = min(copylen, remain);
+	if (copylen > 0) {
+		src = id + pos;
+		if (copy_to_user(dest, src, copylen))
+			return -EFAULT;
+		remain -= copylen;
+		pos += copylen;
+		dest += copylen;
+	}
+	/* Copy kvm stats header */
+	copylen = KVM_STATS_ID_MAXLEN + size_header - pos;
+	copylen = min(copylen, remain);
+	if (copylen > 0) {
+		src = header + pos - KVM_STATS_ID_MAXLEN;
+		if (copy_to_user(dest, src, copylen))
+			return -EFAULT;
+		remain -= copylen;
+		pos += copylen;
+		dest += copylen;
+	}
+	/* Copy kvm stats descriptors */
+	copylen = header->desc_offset + size_desc - pos;
+	copylen = min(copylen, remain);
+	if (copylen > 0) {
+		src = desc + pos - header->desc_offset;
+		if (copy_to_user(dest, src, copylen))
+			return -EFAULT;
+		remain -= copylen;
+		pos += copylen;
+		dest += copylen;
+	}
+	/* Copy kvm stats values */
+	copylen = header->data_offset + size_stats - pos;
+	copylen = min(copylen, remain);
+	if (copylen > 0) {
+		src = stats + pos - header->data_offset;
+		if (copy_to_user(dest, src, copylen))
+			return -EFAULT;
+		remain -= copylen;
+		pos += copylen;
+		dest += copylen;
+	}
+
+	*offset = pos;
+	return len;
+}
+
+static ssize_t kvm_vcpu_stats_read(struct file *file, char __user *user_buffer,
+			      size_t size, loff_t *offset)
+{
+	char id[KVM_STATS_ID_MAXLEN];
+	struct kvm_vcpu *vcpu = file->private_data;
+
+	snprintf(id, sizeof(id), "kvm-%d/vcpu-%d",
+			task_pid_nr(current), vcpu->vcpu_id);
+	return kvm_stats_read(id, &kvm_vcpu_stats_header,
+			&kvm_vcpu_stats_desc[0], &vcpu->stat,
+			sizeof(vcpu->stat), user_buffer, size, offset);
+}
+
+static const struct file_operations kvm_vcpu_stats_fops = {
+	.read = kvm_vcpu_stats_read,
+	.llseek = noop_llseek,
+};
+
+static int kvm_vcpu_ioctl_get_statsfd(struct kvm_vcpu *vcpu)
+{
+	int error, fd;
+	struct file *file;
+	char name[15 + ITOA_MAX_LEN + 1];
+
+	snprintf(name, sizeof(name), "kvm-vcpu-stats:%d", vcpu->vcpu_id);
+
+	error = get_unused_fd_flags(O_CLOEXEC);
+	if (error < 0)
+		return error;
+	fd = error;
+
+	file = anon_inode_getfile(name, &kvm_vcpu_stats_fops, vcpu, O_RDONLY);
+	if (IS_ERR(file)) {
+		error = PTR_ERR(file);
+		goto err_put_unused_fd;
+	}
+	file->f_mode |= FMODE_PREAD;
+	fd_install(fd, file);
+
+	return fd;
+
+err_put_unused_fd:
+	put_unused_fd(fd);
+	return error;
+}
+
 static long kvm_vcpu_ioctl(struct file *filp,
 			   unsigned int ioctl, unsigned long arg)
 {
@@ -3606,6 +3720,10 @@ static long kvm_vcpu_ioctl(struct file *filp,
 		r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
 		break;
 	}
+	case KVM_STATS_GETFD: {
+		r = kvm_vcpu_ioctl_get_statsfd(vcpu);
+		break;
+	}
 	default:
 		r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
 	}
@@ -3864,6 +3982,8 @@ static long kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg)
 #else
 		return 0;
 #endif
+	case KVM_CAP_STATS_BINARY_FD:
+		return 1;
 	default:
 		break;
 	}
@@ -3967,6 +4087,48 @@ static int kvm_vm_ioctl_enable_cap_generic(struct kvm *kvm,
 	}
 }
 
+static ssize_t kvm_vm_stats_read(struct file *file, char __user *user_buffer,
+			      size_t size, loff_t *offset)
+{
+	char id[KVM_STATS_ID_MAXLEN];
+	struct kvm *kvm = file->private_data;
+
+	snprintf(id, sizeof(id), "kvm-%d", task_pid_nr(current));
+	return kvm_stats_read(id, &kvm_vm_stats_header, &kvm_vm_stats_desc[0],
+		&kvm->stat, sizeof(kvm->stat), user_buffer, size, offset);
+}
+
+static const struct file_operations kvm_vm_stats_fops = {
+	.read = kvm_vm_stats_read,
+	.llseek = noop_llseek,
+};
+
+static int kvm_vm_ioctl_get_statsfd(struct kvm *kvm)
+{
+	int error, fd;
+	struct file *file;
+
+	error = get_unused_fd_flags(O_CLOEXEC);
+	if (error < 0)
+		return error;
+	fd = error;
+
+	file = anon_inode_getfile("kvm-vm-stats",
+			&kvm_vm_stats_fops, kvm, O_RDONLY);
+	if (IS_ERR(file)) {
+		error = PTR_ERR(file);
+		goto err_put_unused_fd;
+	}
+	file->f_mode |= FMODE_PREAD;
+	fd_install(fd, file);
+
+	return fd;
+
+err_put_unused_fd:
+	put_unused_fd(fd);
+	return error;
+}
+
 static long kvm_vm_ioctl(struct file *filp,
 			   unsigned int ioctl, unsigned long arg)
 {
@@ -4149,6 +4311,9 @@ static long kvm_vm_ioctl(struct file *filp,
 	case KVM_RESET_DIRTY_RINGS:
 		r = kvm_vm_ioctl_reset_dirty_pages(kvm);
 		break;
+	case KVM_STATS_GETFD:
+		r = kvm_vm_ioctl_get_statsfd(kvm);
+		break;
 	default:
 		r = kvm_arch_vm_ioctl(filp, ioctl, arg);
 	}
-- 
2.31.1.818.g46aad6cb9e-goog

[PATCH v6 2/4] KVM: stats: Add fd-based API to read binary stats data

[Jing Zhang]

Provides a file descriptor per VM to read VM stats info/data.
Provides a file descriptor per vCPU to read vCPU stats info/data.

Reviewed-by: David Matlack <dmatlack@google.com>
Reviewed-by: Ricardo Koller <ricarkol@google.com>
Signed-off-by: Jing Zhang <jingzhangos@google.com>
---
 arch/arm64/kvm/guest.c    |  26 ++++++
 arch/mips/kvm/mips.c      |  52 ++++++++++++
 arch/powerpc/kvm/book3s.c |  52 ++++++++++++
 arch/powerpc/kvm/booke.c  |  45 +++++++++++
 arch/s390/kvm/kvm-s390.c  | 117 +++++++++++++++++++++++++++
 arch/x86/kvm/x86.c        |  53 ++++++++++++
 include/linux/kvm_host.h  | 132 ++++++++++++++++++++++++++++++
 include/uapi/linux/kvm.h  |  50 ++++++++++++
 virt/kvm/kvm_main.c       | 165 ++++++++++++++++++++++++++++++++++++++
 9 files changed, 692 insertions(+)

diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
index 0e41331b0911..1cc1d83630ac 100644
--- a/arch/arm64/kvm/guest.c
+++ b/arch/arm64/kvm/guest.c
@@ -28,6 +28,32 @@
 
 #include "trace.h"
 
+struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC();
+
+struct _kvm_stats_header kvm_vm_stats_header = {
+	.name_size = KVM_STATS_NAME_LEN,
+	.count = ARRAY_SIZE(kvm_vm_stats_desc),
+	.desc_offset = sizeof(struct kvm_stats_header),
+	.data_offset = sizeof(struct kvm_stats_header) +
+		sizeof(kvm_vm_stats_desc),
+};
+
+struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
+	STATS_DESC_COUNTER("hvc_exit_stat"),
+	STATS_DESC_COUNTER("wfe_exit_stat"),
+	STATS_DESC_COUNTER("wfi_exit_stat"),
+	STATS_DESC_COUNTER("mmio_exit_user"),
+	STATS_DESC_COUNTER("mmio_exit_kernel"),
+	STATS_DESC_COUNTER("exits"));
+
+struct _kvm_stats_header kvm_vcpu_stats_header = {
+	.name_size = KVM_STATS_NAME_LEN,
+	.count = ARRAY_SIZE(kvm_vcpu_stats_desc),
+	.desc_offset = sizeof(struct kvm_stats_header),
+	.data_offset = sizeof(struct kvm_stats_header) +
+		sizeof(kvm_vcpu_stats_desc),
+};
+
 struct kvm_stats_debugfs_item debugfs_entries[] = {
 	VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
 	VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
index f4fc60c05e9c..f17a65743ccd 100644
--- a/arch/mips/kvm/mips.c
+++ b/arch/mips/kvm/mips.c
@@ -38,6 +38,58 @@
 #define VECTORSPACING 0x100	/* for EI/VI mode */
 #endif
 
+struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC();
+
+struct _kvm_stats_header kvm_vm_stats_header = {
+	.name_size = KVM_STATS_NAME_LEN,
+	.count = ARRAY_SIZE(kvm_vm_stats_desc),
+	.desc_offset = sizeof(struct kvm_stats_header),
+	.data_offset = sizeof(struct kvm_stats_header) +
+		sizeof(kvm_vm_stats_desc),
+};
+
+struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
+	STATS_DESC_COUNTER("wait_exits"),
+	STATS_DESC_COUNTER("cache_exits"),
+	STATS_DESC_COUNTER("signal_exits"),
+	STATS_DESC_COUNTER("int_exits"),
+	STATS_DESC_COUNTER("cop_unusable_exits"),
+	STATS_DESC_COUNTER("tlbmod_exits"),
+	STATS_DESC_COUNTER("tlbmiss_ld_exits"),
+	STATS_DESC_COUNTER("tlbmiss_st_exits"),
+	STATS_DESC_COUNTER("addrerr_st_exits"),
+	STATS_DESC_COUNTER("addrerr_ld_exits"),
+	STATS_DESC_COUNTER("syscall_exits"),
+	STATS_DESC_COUNTER("resvd_inst_exits"),
+	STATS_DESC_COUNTER("break_inst_exits"),
+	STATS_DESC_COUNTER("trap_inst_exits"),
+	STATS_DESC_COUNTER("msa_fpe_exits"),
+	STATS_DESC_COUNTER("fpe_exits"),
+	STATS_DESC_COUNTER("msa_disabled_exits"),
+	STATS_DESC_COUNTER("flush_dcache_exits"),
+#ifdef CONFIG_KVM_MIPS_VZ
+	STATS_DESC_COUNTER("vz_gpsi_exits"),
+	STATS_DESC_COUNTER("vz_gsfc_exits"),
+	STATS_DESC_COUNTER("vz_hc_exits"),
+	STATS_DESC_COUNTER("vz_grr_exits"),
+	STATS_DESC_COUNTER("vz_gva_exits"),
+	STATS_DESC_COUNTER("vz_ghfc_exits"),
+	STATS_DESC_COUNTER("vz_gpa_exits"),
+	STATS_DESC_COUNTER("vz_resvd_exits"),
+#ifdef CONFIG_CPU_LOONGSON64
+	STATS_DESC_COUNTER("vz_cpucfg_exits"),
+#endif
+#endif
+	);
+
+struct _kvm_stats_header kvm_vcpu_stats_header = {
+	.name_size = KVM_STATS_NAME_LEN,
+	.count = ARRAY_SIZE(kvm_vcpu_stats_desc),
+	.desc_offset = sizeof(struct kvm_stats_header),
+	.data_offset = sizeof(struct kvm_stats_header) +
+		sizeof(kvm_vcpu_stats_desc),
+};
+
 struct kvm_stats_debugfs_item debugfs_entries[] = {
 	VCPU_STAT("wait", wait_exits),
 	VCPU_STAT("cache", cache_exits),
diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
index bd3a10e1fdaf..5e8ee0d39ef9 100644
--- a/arch/powerpc/kvm/book3s.c
+++ b/arch/powerpc/kvm/book3s.c
@@ -38,6 +38,58 @@
 
 /* #define EXIT_DEBUG */
 
+struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(
+	STATS_DESC_ICOUNTER("num_2M_pages"),
+	STATS_DESC_ICOUNTER("num_1G_pages"));
+
+struct _kvm_stats_header kvm_vm_stats_header = {
+	.name_size = KVM_STATS_NAME_LEN,
+	.count = ARRAY_SIZE(kvm_vm_stats_desc),
+	.desc_offset = sizeof(struct kvm_stats_header),
+	.data_offset = sizeof(struct kvm_stats_header) +
+		sizeof(kvm_vm_stats_desc),
+};
+
+struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
+	STATS_DESC_COUNTER("sum_exits"),
+	STATS_DESC_COUNTER("mmio_exits"),
+	STATS_DESC_COUNTER("signal_exits"),
+	STATS_DESC_COUNTER("light_exits"),
+	STATS_DESC_COUNTER("itlb_real_miss_exits"),
+	STATS_DESC_COUNTER("itlb_virt_miss_exits"),
+	STATS_DESC_COUNTER("dtlb_real_miss_exits"),
+	STATS_DESC_COUNTER("dtlb_virt_miss_exits"),
+	STATS_DESC_COUNTER("syscall_exits"),
+	STATS_DESC_COUNTER("isi_exits"),
+	STATS_DESC_COUNTER("dsi_exits"),
+	STATS_DESC_COUNTER("emulated_inst_exits"),
+	STATS_DESC_COUNTER("dec_exits"),
+	STATS_DESC_COUNTER("ext_intr_exits"),
+	STATS_DESC_TIME_NSEC("halt_wait_ns"),
+	STATS_DESC_COUNTER("halt_successful_wait"),
+	STATS_DESC_COUNTER("dbell_exits"),
+	STATS_DESC_COUNTER("gdbell_exits"),
+	STATS_DESC_COUNTER("ld"),
+	STATS_DESC_COUNTER("st"),
+	STATS_DESC_COUNTER("pf_storage"),
+	STATS_DESC_COUNTER("pf_instruc"),
+	STATS_DESC_COUNTER("sp_storage"),
+	STATS_DESC_COUNTER("sp_instruc"),
+	STATS_DESC_COUNTER("queue_intr"),
+	STATS_DESC_COUNTER("ld_slow"),
+	STATS_DESC_COUNTER("st_slow"),
+	STATS_DESC_COUNTER("pthru_all"),
+	STATS_DESC_COUNTER("pthru_host"),
+	STATS_DESC_COUNTER("pthru_bad_aff"));
+
+struct _kvm_stats_header kvm_vcpu_stats_header = {
+	.name_size = KVM_STATS_NAME_LEN,
+	.count = ARRAY_SIZE(kvm_vcpu_stats_desc),
+	.desc_offset = sizeof(struct kvm_stats_header),
+	.data_offset = sizeof(struct kvm_stats_header) +
+		sizeof(kvm_vcpu_stats_desc),
+};
+
 struct kvm_stats_debugfs_item debugfs_entries[] = {
 	VCPU_STAT("exits", sum_exits),
 	VCPU_STAT("mmio", mmio_exits),
diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
index 07fdd7a1254a..86d221e9193e 100644
--- a/arch/powerpc/kvm/booke.c
+++ b/arch/powerpc/kvm/booke.c
@@ -36,6 +36,51 @@
 
 unsigned long kvmppc_booke_handlers;
 
+struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(
+	STATS_DESC_ICOUNTER("num_2M_pages"),
+	STATS_DESC_ICOUNTER("num_1G_pages"));
+
+struct _kvm_stats_header kvm_vm_stats_header = {
+	.name_size = KVM_STATS_NAME_LEN,
+	.count = ARRAY_SIZE(kvm_vm_stats_desc),
+	.desc_offset = sizeof(struct kvm_stats_header),
+	.data_offset = sizeof(struct kvm_stats_header) +
+		sizeof(kvm_vm_stats_desc),
+};
+
+struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
+	STATS_DESC_COUNTER("sum_exits"),
+	STATS_DESC_COUNTER("mmio_exits"),
+	STATS_DESC_COUNTER("signal_exits"),
+	STATS_DESC_COUNTER("light_exits"),
+	STATS_DESC_COUNTER("itlb_real_miss_exits"),
+	STATS_DESC_COUNTER("itlb_virt_miss_exits"),
+	STATS_DESC_COUNTER("dtlb_real_miss_exits"),
+	STATS_DESC_COUNTER("dtlb_virt_miss_exits"),
+	STATS_DESC_COUNTER("syscall_exits"),
+	STATS_DESC_COUNTER("isi_exits"),
+	STATS_DESC_COUNTER("dsi_exits"),
+	STATS_DESC_COUNTER("emulated_inst_exits"),
+	STATS_DESC_COUNTER("dec_exits"),
+	STATS_DESC_COUNTER("ext_intr_exits"),
+	STATS_DESC_TIME_NSEC("halt_wait_ns"),
+	STATS_DESC_COUNTER("halt_successful_wait"),
+	STATS_DESC_COUNTER("dbell_exits"),
+	STATS_DESC_COUNTER("gdbell_exits"),
+	STATS_DESC_COUNTER("ld"),
+	STATS_DESC_COUNTER("st"),
+	STATS_DESC_COUNTER("pthru_all"),
+	STATS_DESC_COUNTER("pthru_host"),
+	STATS_DESC_COUNTER("pthru_bad_aff"));
+
+struct _kvm_stats_header kvm_vcpu_stats_header = {
+	.name_size = KVM_STATS_NAME_LEN,
+	.count = ARRAY_SIZE(kvm_vcpu_stats_desc),
+	.desc_offset = sizeof(struct kvm_stats_header),
+	.data_offset = sizeof(struct kvm_stats_header) +
+		sizeof(kvm_vcpu_stats_desc),
+};
+
 struct kvm_stats_debugfs_item debugfs_entries[] = {
 	VCPU_STAT("mmio", mmio_exits),
 	VCPU_STAT("sig", signal_exits),
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index d6bf3372bb10..003feee79fce 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -58,6 +58,123 @@
 #define VCPU_IRQS_MAX_BUF (sizeof(struct kvm_s390_irq) * \
 			   (KVM_MAX_VCPUS + LOCAL_IRQS))
 
+struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(
+	STATS_DESC_COUNTER("inject_io"),
+	STATS_DESC_COUNTER("inject_float_mchk"),
+	STATS_DESC_COUNTER("inject_pfault_done"),
+	STATS_DESC_COUNTER("inject_service_signal"),
+	STATS_DESC_COUNTER("inject_virtio"));
+
+struct _kvm_stats_header kvm_vm_stats_header = {
+	.name_size = KVM_STATS_NAME_LEN,
+	.count = ARRAY_SIZE(kvm_vm_stats_desc),
+	.desc_offset = sizeof(struct kvm_stats_header),
+	.data_offset = sizeof(struct kvm_stats_header) +
+		sizeof(kvm_vm_stats_desc),
+};
+
+struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
+	STATS_DESC_COUNTER("exit_userspace"),
+	STATS_DESC_COUNTER("exit_null"),
+	STATS_DESC_COUNTER("exit_external_request"),
+	STATS_DESC_COUNTER("exit_io_request"),
+	STATS_DESC_COUNTER("exit_external_interrupt"),
+	STATS_DESC_COUNTER("exit_stop_request"),
+	STATS_DESC_COUNTER("exit_validity"),
+	STATS_DESC_COUNTER("exit_instruction"),
+	STATS_DESC_COUNTER("exit_pei"),
+	STATS_DESC_COUNTER("halt_no_poll_steal"),
+	STATS_DESC_COUNTER("instruction_lctl"),
+	STATS_DESC_COUNTER("instruction_lctlg"),
+	STATS_DESC_COUNTER("instruction_stctl"),
+	STATS_DESC_COUNTER("instruction_stctg"),
+	STATS_DESC_COUNTER("exit_program_interruption"),
+	STATS_DESC_COUNTER("exit_instr_and_program"),
+	STATS_DESC_COUNTER("exit_operation_exception"),
+	STATS_DESC_COUNTER("deliver_ckc"),
+	STATS_DESC_COUNTER("deliver_cputm"),
+	STATS_DESC_COUNTER("deliver_external_call"),
+	STATS_DESC_COUNTER("deliver_emergency_signal"),
+	STATS_DESC_COUNTER("deliver_service_signal"),
+	STATS_DESC_COUNTER("deliver_virtio"),
+	STATS_DESC_COUNTER("deliver_stop_signal"),
+	STATS_DESC_COUNTER("deliver_prefix_signal"),
+	STATS_DESC_COUNTER("deliver_restart_signal"),
+	STATS_DESC_COUNTER("deliver_program"),
+	STATS_DESC_COUNTER("deliver_io"),
+	STATS_DESC_COUNTER("deliver_machine_check"),
+	STATS_DESC_COUNTER("exit_wait_state"),
+	STATS_DESC_COUNTER("inject_ckc"),
+	STATS_DESC_COUNTER("inject_cputm"),
+	STATS_DESC_COUNTER("inject_external_call"),
+	STATS_DESC_COUNTER("inject_emergency_signal"),
+	STATS_DESC_COUNTER("inject_mchk"),
+	STATS_DESC_COUNTER("inject_pfault_init"),
+	STATS_DESC_COUNTER("inject_program"),
+	STATS_DESC_COUNTER("inject_restart"),
+	STATS_DESC_COUNTER("inject_set_prefix"),
+	STATS_DESC_COUNTER("inject_stop_signal"),
+	STATS_DESC_COUNTER("instruction_epsw"),
+	STATS_DESC_COUNTER("instruction_gs"),
+	STATS_DESC_COUNTER("instruction_io_other"),
+	STATS_DESC_COUNTER("instruction_lpsw"),
+	STATS_DESC_COUNTER("instruction_lpswe"),
+	STATS_DESC_COUNTER("instruction_pfmf"),
+	STATS_DESC_COUNTER("instruction_ptff"),
+	STATS_DESC_COUNTER("instruction_sck"),
+	STATS_DESC_COUNTER("instruction_sckpf"),
+	STATS_DESC_COUNTER("instruction_stidp"),
+	STATS_DESC_COUNTER("instruction_spx"),
+	STATS_DESC_COUNTER("instruction_stpx"),
+	STATS_DESC_COUNTER("instruction_stap"),
+	STATS_DESC_COUNTER("instruction_iske"),
+	STATS_DESC_COUNTER("instruction_ri"),
+	STATS_DESC_COUNTER("instruction_rrbe"),
+	STATS_DESC_COUNTER("instruction_sske"),
+	STATS_DESC_COUNTER("instruction_ipte_interlock"),
+	STATS_DESC_COUNTER("instruction_stsi"),
+	STATS_DESC_COUNTER("instruction_stfl"),
+	STATS_DESC_COUNTER("instruction_tb"),
+	STATS_DESC_COUNTER("instruction_tpi"),
+	STATS_DESC_COUNTER("instruction_tprot"),
+	STATS_DESC_COUNTER("instruction_tsch"),
+	STATS_DESC_COUNTER("instruction_sie"),
+	STATS_DESC_COUNTER("instruction_essa"),
+	STATS_DESC_COUNTER("instruction_sthyi"),
+	STATS_DESC_COUNTER("instruction_sigp_sense"),
+	STATS_DESC_COUNTER("instruction_sigp_sense_running"),
+	STATS_DESC_COUNTER("instruction_sigp_external_call"),
+	STATS_DESC_COUNTER("instruction_sigp_emergency"),
+	STATS_DESC_COUNTER("instruction_sigp_cond_emergency"),
+	STATS_DESC_COUNTER("instruction_sigp_start"),
+	STATS_DESC_COUNTER("instruction_sigp_stop"),
+	STATS_DESC_COUNTER("instruction_sigp_stop_store_status"),
+	STATS_DESC_COUNTER("instruction_sigp_store_status"),
+	STATS_DESC_COUNTER("instruction_sigp_store_adtl_status"),
+	STATS_DESC_COUNTER("instruction_sigp_arch"),
+	STATS_DESC_COUNTER("instruction_sigp_prefix"),
+	STATS_DESC_COUNTER("instruction_sigp_restart"),
+	STATS_DESC_COUNTER("instruction_sigp_init_cpu_reset"),
+	STATS_DESC_COUNTER("instruction_sigp_cpu_reset"),
+	STATS_DESC_COUNTER("instruction_sigp_unknown"),
+	STATS_DESC_COUNTER("diagnose_10"),
+	STATS_DESC_COUNTER("diagnose_44"),
+	STATS_DESC_COUNTER("diagnose_9c"),
+	STATS_DESC_COUNTER("diagnose_9c_ignored"),
+	STATS_DESC_COUNTER("diagnose_258"),
+	STATS_DESC_COUNTER("diagnose_308"),
+	STATS_DESC_COUNTER("diagnose_500"),
+	STATS_DESC_COUNTER("diagnose_other"),
+	STATS_DESC_COUNTER("pfault_sync"));
+
+struct _kvm_stats_header kvm_vcpu_stats_header = {
+	.name_size = KVM_STATS_NAME_LEN,
+	.count = ARRAY_SIZE(kvm_vcpu_stats_desc),
+	.desc_offset = sizeof(struct kvm_stats_header),
+	.data_offset = sizeof(struct kvm_stats_header) +
+		sizeof(kvm_vcpu_stats_desc),
+};
+
 struct kvm_stats_debugfs_item debugfs_entries[] = {
 	VCPU_STAT("userspace_handled", exit_userspace),
 	VCPU_STAT("exit_null", exit_null),
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 9a93d80caff6..84880687c199 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -214,6 +214,59 @@ EXPORT_SYMBOL_GPL(host_xss);
 u64 __read_mostly supported_xss;
 EXPORT_SYMBOL_GPL(supported_xss);
 
+struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(
+	STATS_DESC_COUNTER("mmu_shadow_zapped"),
+	STATS_DESC_COUNTER("mmu_pte_write"),
+	STATS_DESC_COUNTER("mmu_pde_zapped"),
+	STATS_DESC_COUNTER("mmu_flooded"),
+	STATS_DESC_COUNTER("mmu_recycled"),
+	STATS_DESC_COUNTER("mmu_cache_miss"),
+	STATS_DESC_ICOUNTER("mmu_unsync"),
+	STATS_DESC_ICOUNTER("largepages"),
+	STATS_DESC_ICOUNTER("nx_largepages_splits"),
+	STATS_DESC_ICOUNTER("max_mmu_page_hash_collisions"));
+
+struct _kvm_stats_header kvm_vm_stats_header = {
+	.name_size = KVM_STATS_NAME_LEN,
+	.count = ARRAY_SIZE(kvm_vm_stats_desc),
+	.desc_offset = sizeof(struct kvm_stats_header),
+	.data_offset = sizeof(struct kvm_stats_header) +
+		sizeof(kvm_vm_stats_desc),
+};
+
+struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
+	STATS_DESC_COUNTER("pf_fixed"),
+	STATS_DESC_COUNTER("pf_guest"),
+	STATS_DESC_COUNTER("tlb_flush"),
+	STATS_DESC_COUNTER("invlpg"),
+	STATS_DESC_COUNTER("exits"),
+	STATS_DESC_COUNTER("io_exits"),
+	STATS_DESC_COUNTER("mmio_exits"),
+	STATS_DESC_COUNTER("signal_exits"),
+	STATS_DESC_COUNTER("irq_window_exits"),
+	STATS_DESC_COUNTER("nmi_window_exits"),
+	STATS_DESC_COUNTER("l1d_flush"),
+	STATS_DESC_COUNTER("halt_exits"),
+	STATS_DESC_COUNTER("request_irq_exits"),
+	STATS_DESC_COUNTER("irq_exits"),
+	STATS_DESC_COUNTER("host_state_reload"),
+	STATS_DESC_COUNTER("fpu_reload"),
+	STATS_DESC_COUNTER("insn_emulation"),
+	STATS_DESC_COUNTER("insn_emulation_fail"),
+	STATS_DESC_COUNTER("hypercalls"),
+	STATS_DESC_COUNTER("irq_injections"),
+	STATS_DESC_COUNTER("nmi_injections"),
+	STATS_DESC_COUNTER("req_event"),
+	STATS_DESC_COUNTER("nested_run"));
+
+struct _kvm_stats_header kvm_vcpu_stats_header = {
+	.name_size = KVM_STATS_NAME_LEN,
+	.count = ARRAY_SIZE(kvm_vcpu_stats_desc),
+	.desc_offset = sizeof(struct kvm_stats_header),
+	.data_offset = sizeof(struct kvm_stats_header) +
+		sizeof(kvm_vcpu_stats_desc),
+};
+
 struct kvm_stats_debugfs_item debugfs_entries[] = {
 	VCPU_STAT("pf_fixed", pf_fixed),
 	VCPU_STAT("pf_guest", pf_guest),
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 97700e41db3b..c0a8e6ddc745 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -1240,6 +1240,19 @@ struct kvm_stats_debugfs_item {
 	int mode;
 };
 
+struct _kvm_stats_header {
+	__u32 name_size;
+	__u32 count;
+	__u32 desc_offset;
+	__u32 data_offset;
+};
+
+#define KVM_STATS_NAME_LEN	48
+struct _kvm_stats_desc {
+	struct kvm_stats_desc desc;
+	char name[KVM_STATS_NAME_LEN];
+};
+
 #define KVM_DBGFS_GET_MODE(dbgfs_item)                                         \
 	((dbgfs_item)->mode ? (dbgfs_item)->mode : 0644)
 
@@ -1253,8 +1266,127 @@ struct kvm_stats_debugfs_item {
 	{ n, offsetof(struct kvm_vcpu, stat.common.x),			       \
 	  KVM_STAT_VCPU, ## __VA_ARGS__ }
 
+#define STATS_DESC(stat, type, unit, scale, exp)			       \
+	{								       \
+		{							       \
+			.flags = type | unit | scale,			       \
+			.exponent = exp,				       \
+			.size = 1					       \
+		},							       \
+		.name = stat,						       \
+	}
+#define STATS_DESC_CUMULATIVE(name, unit, scale, exponent)		       \
+	STATS_DESC(name, KVM_STATS_TYPE_CUMULATIVE, unit, scale, exponent)
+#define STATS_DESC_INSTANT(name, unit, scale, exponent)			       \
+	STATS_DESC(name, KVM_STATS_TYPE_INSTANT, unit, scale, exponent)
+
+/* Cumulative counter */
+#define STATS_DESC_COUNTER(name)					       \
+	STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_NONE,		       \
+		KVM_STATS_BASE_POW10, 0)
+/* Instantaneous counter */
+#define STATS_DESC_ICOUNTER(name)					       \
+	STATS_DESC_INSTANT(name, KVM_STATS_UNIT_NONE,			       \
+		KVM_STATS_BASE_POW10, 0)
+
+/* Cumulative clock cycles */
+#define STATS_DESC_CYCLE(name)						       \
+	STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_CYCLES,		       \
+		KVM_STATS_BASE_POW10, 0)
+/* Instantaneous clock cycles */
+#define STATS_DESC_ICYCLE(name)						       \
+	STATS_DESC_INSTANT(name, KVM_STATS_UNIT_CYCLES,			       \
+		KVM_STATS_BASE_POW10, 0)
+
+/* Cumulative memory size in Byte */
+#define STATS_DESC_SIZE_BYTE(name)					       \
+	STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES,		       \
+		KVM_STATS_BASE_POW2, 0)
+/* Cumulative memory size in KiByte */
+#define STATS_DESC_SIZE_KBYTE(name)					       \
+	STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES,		       \
+		KVM_STATS_BASE_POW2, 10)
+/* Cumulative memory size in MiByte */
+#define STATS_DESC_SIZE_MBYTE(name)					       \
+	STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES,		       \
+		KVM_STATS_BASE_POW2, 20)
+/* Cumulative memory size in GiByte */
+#define STATS_DESC_SIZE_GBYTE(name)					       \
+	STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES,		       \
+		KVM_STATS_BASE_POW2, 30)
+
+/* Instantaneous memory size in Byte */
+#define STATS_DESC_ISIZE_BYTE(name)					       \
+	STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES,			       \
+		KVM_STATS_BASE_POW2, 0)
+/* Instantaneous memory size in KiByte */
+#define STATS_DESC_ISIZE_KBYTE(name)					       \
+	STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES,			       \
+		KVM_STATS_BASE_POW2, 10)
+/* Instantaneous memory size in MiByte */
+#define STATS_DESC_ISIZE_MBYTE(name)					       \
+	STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES,			       \
+		KVM_STATS_BASE_POW2, 20)
+/* Instantaneous memory size in GiByte */
+#define STATS_DESC_ISIZE_GBYTE(name)					       \
+	STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES,			       \
+		KVM_STATS_BASE_POW2, 30)
+
+/* Cumulative time in second */
+#define STATS_DESC_TIME_SEC(name)					       \
+	STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS,		       \
+		KVM_STATS_BASE_POW10, 0)
+/* Cumulative time in millisecond */
+#define STATS_DESC_TIME_MSEC(name)					       \
+	STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS,		       \
+		KVM_STATS_BASE_POW10, -3)
+/* Cumulative time in microsecond */
+#define STATS_DESC_TIME_USEC(name)					       \
+	STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS,		       \
+		KVM_STATS_BASE_POW10, -6)
+/* Cumulative time in nanosecond */
+#define STATS_DESC_TIME_NSEC(name)					       \
+	STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS,		       \
+		KVM_STATS_BASE_POW10, -9)
+
+/* Instantaneous time in second */
+#define STATS_DESC_ITIME_SEC(name)					       \
+	STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS,		       \
+		KVM_STATS_BASE_POW10, 0)
+/* Instantaneous time in millisecond */
+#define STATS_DESC_ITIME_MSEC(name)					       \
+	STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS,		       \
+		KVM_STATS_BASE_POW10, -3)
+/* Instantaneous time in microsecond */
+#define STATS_DESC_ITIME_USEC(name)					       \
+	STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS,		       \
+		KVM_STATS_BASE_POW10, -6)
+/* Instantaneous time in nanosecond */
+#define STATS_DESC_ITIME_NSEC(name)					       \
+	STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS,		       \
+		KVM_STATS_BASE_POW10, -9)
+
+#define DEFINE_VM_STATS_DESC(...) {					       \
+	STATS_DESC_COUNTER("remote_tlb_flush"),				       \
+	## __VA_ARGS__							       \
+}
+
+#define DEFINE_VCPU_STATS_DESC(...) {					       \
+	STATS_DESC_COUNTER("halt_successful_poll"),			       \
+	STATS_DESC_COUNTER("halt_attempted_poll"),			       \
+	STATS_DESC_COUNTER("halt_poll_invalid"),			       \
+	STATS_DESC_COUNTER("halt_wakeup"),				       \
+	STATS_DESC_TIME_NSEC("halt_poll_success_ns"),			       \
+	STATS_DESC_TIME_NSEC("halt_poll_fail_ns"),			       \
+	## __VA_ARGS__							       \
+}
+
 extern struct kvm_stats_debugfs_item debugfs_entries[];
 extern struct dentry *kvm_debugfs_dir;
+extern struct _kvm_stats_header kvm_vm_stats_header;
+extern struct _kvm_stats_header kvm_vcpu_stats_header;
+extern struct _kvm_stats_desc kvm_vm_stats_desc[];
+extern struct _kvm_stats_desc kvm_vcpu_stats_desc[];
 
 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
 static inline int mmu_notifier_retry(struct kvm *kvm, unsigned long mmu_seq)
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 3fd9a7e9d90c..82db825c392c 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -1082,6 +1082,7 @@ struct kvm_ppc_resize_hpt {
 #define KVM_CAP_SGX_ATTRIBUTE 196
 #define KVM_CAP_VM_COPY_ENC_CONTEXT_FROM 197
 #define KVM_CAP_PTP_KVM 198
+#define KVM_CAP_STATS_BINARY_FD 199
 
 #ifdef KVM_CAP_IRQ_ROUTING
 
@@ -1898,4 +1899,53 @@ struct kvm_dirty_gfn {
 #define KVM_BUS_LOCK_DETECTION_OFF             (1 << 0)
 #define KVM_BUS_LOCK_DETECTION_EXIT            (1 << 1)
 
+#define KVM_STATS_ID_MAXLEN		64
+
+struct kvm_stats_header {
+	char id[KVM_STATS_ID_MAXLEN];
+	__u32 name_size;
+	__u32 count;
+	__u32 desc_offset;
+	__u32 data_offset;
+};
+
+#define KVM_STATS_TYPE_SHIFT		0
+#define KVM_STATS_TYPE_MASK		(0xF << KVM_STATS_TYPE_SHIFT)
+#define KVM_STATS_TYPE_CUMULATIVE	(0x0 << KVM_STATS_TYPE_SHIFT)
+#define KVM_STATS_TYPE_INSTANT		(0x1 << KVM_STATS_TYPE_SHIFT)
+#define KVM_STATS_TYPE_MAX		KVM_STATS_TYPE_INSTANT
+
+#define KVM_STATS_UNIT_SHIFT		4
+#define KVM_STATS_UNIT_MASK		(0xF << KVM_STATS_UNIT_SHIFT)
+#define KVM_STATS_UNIT_NONE		(0x0 << KVM_STATS_UNIT_SHIFT)
+#define KVM_STATS_UNIT_BYTES		(0x1 << KVM_STATS_UNIT_SHIFT)
+#define KVM_STATS_UNIT_SECONDS		(0x2 << KVM_STATS_UNIT_SHIFT)
+#define KVM_STATS_UNIT_CYCLES		(0x3 << KVM_STATS_UNIT_SHIFT)
+#define KVM_STATS_UNIT_MAX		KVM_STATS_UNIT_CYCLES
+
+#define KVM_STATS_BASE_SHIFT		8
+#define KVM_STATS_BASE_MASK		(0xF << KVM_STATS_BASE_SHIFT)
+#define KVM_STATS_BASE_POW10		(0x0 << KVM_STATS_BASE_SHIFT)
+#define KVM_STATS_BASE_POW2		(0x1 << KVM_STATS_BASE_SHIFT)
+#define KVM_STATS_BASE_MAX		KVM_STATS_BASE_POW2
+
+struct kvm_stats_desc {
+	__u32 flags;
+	__s16 exponent;
+	__u16 size;
+	__u32 unused1;
+	__u32 unused2;
+	char name[0];
+};
+
+struct kvm_vm_stats_data {
+	unsigned long value[0];
+};
+
+struct kvm_vcpu_stats_data {
+	__u64 value[0];
+};
+
+#define KVM_STATS_GETFD  _IOR(KVMIO,  0xcc, struct kvm_stats_header)
+
 #endif /* __LINUX_KVM_H */
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 34a4cf265297..9e20e2ff78b4 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -3409,6 +3409,120 @@ static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
 	return 0;
 }
 
+static ssize_t kvm_stats_read(char *id, struct _kvm_stats_header *header,
+		struct _kvm_stats_desc *desc, void *stats, size_t size_stats,
+		char __user *user_buffer, size_t size, loff_t *offset)
+{
+	ssize_t copylen, len, remain = size;
+	size_t size_header, size_desc;
+	loff_t pos = *offset;
+	char __user *dest = user_buffer;
+	void *src;
+
+	size_header = sizeof(*header);
+	size_desc = header->count * sizeof(*desc);
+
+	len = KVM_STATS_ID_MAXLEN + size_header + size_desc + size_stats - pos;
+	len = min(len, remain);
+	if (len <= 0)
+		return 0;
+	remain = len;
+
+	/* Copy kvm stats header id string */
+	copylen = KVM_STATS_ID_MAXLEN - pos;
+	copylen = min(copylen, remain);
+	if (copylen > 0) {
+		src = id + pos;
+		if (copy_to_user(dest, src, copylen))
+			return -EFAULT;
+		remain -= copylen;
+		pos += copylen;
+		dest += copylen;
+	}
+	/* Copy kvm stats header */
+	copylen = KVM_STATS_ID_MAXLEN + size_header - pos;
+	copylen = min(copylen, remain);
+	if (copylen > 0) {
+		src = header + pos - KVM_STATS_ID_MAXLEN;
+		if (copy_to_user(dest, src, copylen))
+			return -EFAULT;
+		remain -= copylen;
+		pos += copylen;
+		dest += copylen;
+	}
+	/* Copy kvm stats descriptors */
+	copylen = header->desc_offset + size_desc - pos;
+	copylen = min(copylen, remain);
+	if (copylen > 0) {
+		src = desc + pos - header->desc_offset;
+		if (copy_to_user(dest, src, copylen))
+			return -EFAULT;
+		remain -= copylen;
+		pos += copylen;
+		dest += copylen;
+	}
+	/* Copy kvm stats values */
+	copylen = header->data_offset + size_stats - pos;
+	copylen = min(copylen, remain);
+	if (copylen > 0) {
+		src = stats + pos - header->data_offset;
+		if (copy_to_user(dest, src, copylen))
+			return -EFAULT;
+		remain -= copylen;
+		pos += copylen;
+		dest += copylen;
+	}
+
+	*offset = pos;
+	return len;
+}
+
+static ssize_t kvm_vcpu_stats_read(struct file *file, char __user *user_buffer,
+			      size_t size, loff_t *offset)
+{
+	char id[KVM_STATS_ID_MAXLEN];
+	struct kvm_vcpu *vcpu = file->private_data;
+
+	snprintf(id, sizeof(id), "kvm-%d/vcpu-%d",
+			task_pid_nr(current), vcpu->vcpu_id);
+	return kvm_stats_read(id, &kvm_vcpu_stats_header,
+			&kvm_vcpu_stats_desc[0], &vcpu->stat,
+			sizeof(vcpu->stat), user_buffer, size, offset);
+}
+
+static const struct file_operations kvm_vcpu_stats_fops = {
+	.read = kvm_vcpu_stats_read,
+	.llseek = noop_llseek,
+};
+
+static int kvm_vcpu_ioctl_get_statsfd(struct kvm_vcpu *vcpu)
+{
+	int error, fd;
+	struct file *file;
+	char name[15 + ITOA_MAX_LEN + 1];
+
+	snprintf(name, sizeof(name), "kvm-vcpu-stats:%d", vcpu->vcpu_id);
+
+	error = get_unused_fd_flags(O_CLOEXEC);
+	if (error < 0)
+		return error;
+	fd = error;
+
+	file = anon_inode_getfile(name, &kvm_vcpu_stats_fops, vcpu, O_RDONLY);
+	if (IS_ERR(file)) {
+		error = PTR_ERR(file);
+		goto err_put_unused_fd;
+	}
+	file->f_mode |= FMODE_PREAD;
+	fd_install(fd, file);
+
+	return fd;
+
+err_put_unused_fd:
+	put_unused_fd(fd);
+	return error;
+}
+
 static long kvm_vcpu_ioctl(struct file *filp,
 			   unsigned int ioctl, unsigned long arg)
 {
@@ -3606,6 +3720,10 @@ static long kvm_vcpu_ioctl(struct file *filp,
 		r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
 		break;
 	}
+	case KVM_STATS_GETFD: {
+		r = kvm_vcpu_ioctl_get_statsfd(vcpu);
+		break;
+	}
 	default:
 		r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
 	}
@@ -3864,6 +3982,8 @@ static long kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg)
 #else
 		return 0;
 #endif
+	case KVM_CAP_STATS_BINARY_FD:
+		return 1;
 	default:
 		break;
 	}
@@ -3967,6 +4087,48 @@ static int kvm_vm_ioctl_enable_cap_generic(struct kvm *kvm,
 	}
 }
 
+static ssize_t kvm_vm_stats_read(struct file *file, char __user *user_buffer,
+			      size_t size, loff_t *offset)
+{
+	char id[KVM_STATS_ID_MAXLEN];
+	struct kvm *kvm = file->private_data;
+
+	snprintf(id, sizeof(id), "kvm-%d", task_pid_nr(current));
+	return kvm_stats_read(id, &kvm_vm_stats_header, &kvm_vm_stats_desc[0],
+		&kvm->stat, sizeof(kvm->stat), user_buffer, size, offset);
+}
+
+static const struct file_operations kvm_vm_stats_fops = {
+	.read = kvm_vm_stats_read,
+	.llseek = noop_llseek,
+};
+
+static int kvm_vm_ioctl_get_statsfd(struct kvm *kvm)
+{
+	int error, fd;
+	struct file *file;
+
+	error = get_unused_fd_flags(O_CLOEXEC);
+	if (error < 0)
+		return error;
+	fd = error;
+
+	file = anon_inode_getfile("kvm-vm-stats",
+			&kvm_vm_stats_fops, kvm, O_RDONLY);
+	if (IS_ERR(file)) {
+		error = PTR_ERR(file);
+		goto err_put_unused_fd;
+	}
+	file->f_mode |= FMODE_PREAD;
+	fd_install(fd, file);
+
+	return fd;
+
+err_put_unused_fd:
+	put_unused_fd(fd);
+	return error;
+}
+
 static long kvm_vm_ioctl(struct file *filp,
 			   unsigned int ioctl, unsigned long arg)
 {
@@ -4149,6 +4311,9 @@ static long kvm_vm_ioctl(struct file *filp,
 	case KVM_RESET_DIRTY_RINGS:
 		r = kvm_vm_ioctl_reset_dirty_pages(kvm);
 		break;
+	case KVM_STATS_GETFD:
+		r = kvm_vm_ioctl_get_statsfd(kvm);
+		break;
 	default:
 		r = kvm_arch_vm_ioctl(filp, ioctl, arg);
 	}
-- 
2.31.1.818.g46aad6cb9e-goog

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kvmarm@lists.cs.columbia.edu
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Re: [PATCH v6 2/4] KVM: stats: Add fd-based API to read binary stats data

[David Matlack]

On Mon, May 24, 2021 at 8:18 AM Jing Zhang <jingzhangos@google.com> wrote:
>
> Provides a file descriptor per VM to read VM stats info/data.
> Provides a file descriptor per vCPU to read vCPU stats info/data.
>
> Reviewed-by: David Matlack <dmatlack@google.com>
> Reviewed-by: Ricardo Koller <ricarkol@google.com>
> Signed-off-by: Jing Zhang <jingzhangos@google.com>

Looks good. Just some optional nits to consider if you do a v7.

Reviewed-by: David Matlack <dmatlack@google.com>

> ---
>  arch/arm64/kvm/guest.c    |  26 ++++++
>  arch/mips/kvm/mips.c      |  52 ++++++++++++
>  arch/powerpc/kvm/book3s.c |  52 ++++++++++++
>  arch/powerpc/kvm/booke.c  |  45 +++++++++++
>  arch/s390/kvm/kvm-s390.c  | 117 +++++++++++++++++++++++++++
>  arch/x86/kvm/x86.c        |  53 ++++++++++++
>  include/linux/kvm_host.h  | 132 ++++++++++++++++++++++++++++++
>  include/uapi/linux/kvm.h  |  50 ++++++++++++
>  virt/kvm/kvm_main.c       | 165 ++++++++++++++++++++++++++++++++++++++
>  9 files changed, 692 insertions(+)
>
> diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
> index 0e41331b0911..1cc1d83630ac 100644
> --- a/arch/arm64/kvm/guest.c
> +++ b/arch/arm64/kvm/guest.c
> @@ -28,6 +28,32 @@
>
>  #include "trace.h"
>
> +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC();
> +
> +struct _kvm_stats_header kvm_vm_stats_header = {
> +       .name_size = KVM_STATS_NAME_LEN,
> +       .count = ARRAY_SIZE(kvm_vm_stats_desc),
> +       .desc_offset = sizeof(struct kvm_stats_header),
> +       .data_offset = sizeof(struct kvm_stats_header) +
> +               sizeof(kvm_vm_stats_desc),
> +};

nit: Defining the same _kvm_stats_header struct for each arch seems a
bit superfluous? Alternatively you could define them once in
kvm_main.c, or omit them entirely and generate the kvm_stats_header on
the fly when reading the file.


> +
> +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
> +       STATS_DESC_COUNTER("hvc_exit_stat"),
> +       STATS_DESC_COUNTER("wfe_exit_stat"),
> +       STATS_DESC_COUNTER("wfi_exit_stat"),
> +       STATS_DESC_COUNTER("mmio_exit_user"),
> +       STATS_DESC_COUNTER("mmio_exit_kernel"),
> +       STATS_DESC_COUNTER("exits"));
> +
> +struct _kvm_stats_header kvm_vcpu_stats_header = {
> +       .name_size = KVM_STATS_NAME_LEN,
> +       .count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> +       .desc_offset = sizeof(struct kvm_stats_header),
> +       .data_offset = sizeof(struct kvm_stats_header) +
> +               sizeof(kvm_vcpu_stats_desc),
> +};
> +
>  struct kvm_stats_debugfs_item debugfs_entries[] = {
>         VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
>         VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
> index f4fc60c05e9c..f17a65743ccd 100644
> --- a/arch/mips/kvm/mips.c
> +++ b/arch/mips/kvm/mips.c
> @@ -38,6 +38,58 @@
>  #define VECTORSPACING 0x100    /* for EI/VI mode */
>  #endif
>
> +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC();
> +
> +struct _kvm_stats_header kvm_vm_stats_header = {
> +       .name_size = KVM_STATS_NAME_LEN,
> +       .count = ARRAY_SIZE(kvm_vm_stats_desc),
> +       .desc_offset = sizeof(struct kvm_stats_header),
> +       .data_offset = sizeof(struct kvm_stats_header) +
> +               sizeof(kvm_vm_stats_desc),
> +};
> +
> +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
> +       STATS_DESC_COUNTER("wait_exits"),
> +       STATS_DESC_COUNTER("cache_exits"),
> +       STATS_DESC_COUNTER("signal_exits"),
> +       STATS_DESC_COUNTER("int_exits"),
> +       STATS_DESC_COUNTER("cop_unusable_exits"),
> +       STATS_DESC_COUNTER("tlbmod_exits"),
> +       STATS_DESC_COUNTER("tlbmiss_ld_exits"),
> +       STATS_DESC_COUNTER("tlbmiss_st_exits"),
> +       STATS_DESC_COUNTER("addrerr_st_exits"),
> +       STATS_DESC_COUNTER("addrerr_ld_exits"),
> +       STATS_DESC_COUNTER("syscall_exits"),
> +       STATS_DESC_COUNTER("resvd_inst_exits"),
> +       STATS_DESC_COUNTER("break_inst_exits"),
> +       STATS_DESC_COUNTER("trap_inst_exits"),
> +       STATS_DESC_COUNTER("msa_fpe_exits"),
> +       STATS_DESC_COUNTER("fpe_exits"),
> +       STATS_DESC_COUNTER("msa_disabled_exits"),
> +       STATS_DESC_COUNTER("flush_dcache_exits"),
> +#ifdef CONFIG_KVM_MIPS_VZ
> +       STATS_DESC_COUNTER("vz_gpsi_exits"),
> +       STATS_DESC_COUNTER("vz_gsfc_exits"),
> +       STATS_DESC_COUNTER("vz_hc_exits"),
> +       STATS_DESC_COUNTER("vz_grr_exits"),
> +       STATS_DESC_COUNTER("vz_gva_exits"),
> +       STATS_DESC_COUNTER("vz_ghfc_exits"),
> +       STATS_DESC_COUNTER("vz_gpa_exits"),
> +       STATS_DESC_COUNTER("vz_resvd_exits"),
> +#ifdef CONFIG_CPU_LOONGSON64
> +       STATS_DESC_COUNTER("vz_cpucfg_exits"),
> +#endif
> +#endif
> +       );
> +
> +struct _kvm_stats_header kvm_vcpu_stats_header = {
> +       .name_size = KVM_STATS_NAME_LEN,
> +       .count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> +       .desc_offset = sizeof(struct kvm_stats_header),
> +       .data_offset = sizeof(struct kvm_stats_header) +
> +               sizeof(kvm_vcpu_stats_desc),
> +};
> +
>  struct kvm_stats_debugfs_item debugfs_entries[] = {
>         VCPU_STAT("wait", wait_exits),
>         VCPU_STAT("cache", cache_exits),
> diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
> index bd3a10e1fdaf..5e8ee0d39ef9 100644
> --- a/arch/powerpc/kvm/book3s.c
> +++ b/arch/powerpc/kvm/book3s.c
> @@ -38,6 +38,58 @@
>
>  /* #define EXIT_DEBUG */
>
> +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(
> +       STATS_DESC_ICOUNTER("num_2M_pages"),
> +       STATS_DESC_ICOUNTER("num_1G_pages"));
> +
> +struct _kvm_stats_header kvm_vm_stats_header = {
> +       .name_size = KVM_STATS_NAME_LEN,
> +       .count = ARRAY_SIZE(kvm_vm_stats_desc),
> +       .desc_offset = sizeof(struct kvm_stats_header),
> +       .data_offset = sizeof(struct kvm_stats_header) +
> +               sizeof(kvm_vm_stats_desc),
> +};
> +
> +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
> +       STATS_DESC_COUNTER("sum_exits"),
> +       STATS_DESC_COUNTER("mmio_exits"),
> +       STATS_DESC_COUNTER("signal_exits"),
> +       STATS_DESC_COUNTER("light_exits"),
> +       STATS_DESC_COUNTER("itlb_real_miss_exits"),
> +       STATS_DESC_COUNTER("itlb_virt_miss_exits"),
> +       STATS_DESC_COUNTER("dtlb_real_miss_exits"),
> +       STATS_DESC_COUNTER("dtlb_virt_miss_exits"),
> +       STATS_DESC_COUNTER("syscall_exits"),
> +       STATS_DESC_COUNTER("isi_exits"),
> +       STATS_DESC_COUNTER("dsi_exits"),
> +       STATS_DESC_COUNTER("emulated_inst_exits"),
> +       STATS_DESC_COUNTER("dec_exits"),
> +       STATS_DESC_COUNTER("ext_intr_exits"),
> +       STATS_DESC_TIME_NSEC("halt_wait_ns"),
> +       STATS_DESC_COUNTER("halt_successful_wait"),
> +       STATS_DESC_COUNTER("dbell_exits"),
> +       STATS_DESC_COUNTER("gdbell_exits"),
> +       STATS_DESC_COUNTER("ld"),
> +       STATS_DESC_COUNTER("st"),
> +       STATS_DESC_COUNTER("pf_storage"),
> +       STATS_DESC_COUNTER("pf_instruc"),
> +       STATS_DESC_COUNTER("sp_storage"),
> +       STATS_DESC_COUNTER("sp_instruc"),
> +       STATS_DESC_COUNTER("queue_intr"),
> +       STATS_DESC_COUNTER("ld_slow"),
> +       STATS_DESC_COUNTER("st_slow"),
> +       STATS_DESC_COUNTER("pthru_all"),
> +       STATS_DESC_COUNTER("pthru_host"),
> +       STATS_DESC_COUNTER("pthru_bad_aff"));
> +
> +struct _kvm_stats_header kvm_vcpu_stats_header = {
> +       .name_size = KVM_STATS_NAME_LEN,
> +       .count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> +       .desc_offset = sizeof(struct kvm_stats_header),
> +       .data_offset = sizeof(struct kvm_stats_header) +
> +               sizeof(kvm_vcpu_stats_desc),
> +};
> +
>  struct kvm_stats_debugfs_item debugfs_entries[] = {
>         VCPU_STAT("exits", sum_exits),
>         VCPU_STAT("mmio", mmio_exits),
> diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
> index 07fdd7a1254a..86d221e9193e 100644
> --- a/arch/powerpc/kvm/booke.c
> +++ b/arch/powerpc/kvm/booke.c
> @@ -36,6 +36,51 @@
>
>  unsigned long kvmppc_booke_handlers;
>
> +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(
> +       STATS_DESC_ICOUNTER("num_2M_pages"),
> +       STATS_DESC_ICOUNTER("num_1G_pages"));
> +
> +struct _kvm_stats_header kvm_vm_stats_header = {
> +       .name_size = KVM_STATS_NAME_LEN,
> +       .count = ARRAY_SIZE(kvm_vm_stats_desc),
> +       .desc_offset = sizeof(struct kvm_stats_header),
> +       .data_offset = sizeof(struct kvm_stats_header) +
> +               sizeof(kvm_vm_stats_desc),
> +};
> +
> +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
> +       STATS_DESC_COUNTER("sum_exits"),
> +       STATS_DESC_COUNTER("mmio_exits"),
> +       STATS_DESC_COUNTER("signal_exits"),
> +       STATS_DESC_COUNTER("light_exits"),
> +       STATS_DESC_COUNTER("itlb_real_miss_exits"),
> +       STATS_DESC_COUNTER("itlb_virt_miss_exits"),
> +       STATS_DESC_COUNTER("dtlb_real_miss_exits"),
> +       STATS_DESC_COUNTER("dtlb_virt_miss_exits"),
> +       STATS_DESC_COUNTER("syscall_exits"),
> +       STATS_DESC_COUNTER("isi_exits"),
> +       STATS_DESC_COUNTER("dsi_exits"),
> +       STATS_DESC_COUNTER("emulated_inst_exits"),
> +       STATS_DESC_COUNTER("dec_exits"),
> +       STATS_DESC_COUNTER("ext_intr_exits"),
> +       STATS_DESC_TIME_NSEC("halt_wait_ns"),
> +       STATS_DESC_COUNTER("halt_successful_wait"),
> +       STATS_DESC_COUNTER("dbell_exits"),
> +       STATS_DESC_COUNTER("gdbell_exits"),
> +       STATS_DESC_COUNTER("ld"),
> +       STATS_DESC_COUNTER("st"),
> +       STATS_DESC_COUNTER("pthru_all"),
> +       STATS_DESC_COUNTER("pthru_host"),
> +       STATS_DESC_COUNTER("pthru_bad_aff"));
> +
> +struct _kvm_stats_header kvm_vcpu_stats_header = {
> +       .name_size = KVM_STATS_NAME_LEN,
> +       .count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> +       .desc_offset = sizeof(struct kvm_stats_header),
> +       .data_offset = sizeof(struct kvm_stats_header) +
> +               sizeof(kvm_vcpu_stats_desc),
> +};
> +
>  struct kvm_stats_debugfs_item debugfs_entries[] = {
>         VCPU_STAT("mmio", mmio_exits),
>         VCPU_STAT("sig", signal_exits),
> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> index d6bf3372bb10..003feee79fce 100644
> --- a/arch/s390/kvm/kvm-s390.c
> +++ b/arch/s390/kvm/kvm-s390.c
> @@ -58,6 +58,123 @@
>  #define VCPU_IRQS_MAX_BUF (sizeof(struct kvm_s390_irq) * \
>                            (KVM_MAX_VCPUS + LOCAL_IRQS))
>
> +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(
> +       STATS_DESC_COUNTER("inject_io"),
> +       STATS_DESC_COUNTER("inject_float_mchk"),
> +       STATS_DESC_COUNTER("inject_pfault_done"),
> +       STATS_DESC_COUNTER("inject_service_signal"),
> +       STATS_DESC_COUNTER("inject_virtio"));
> +
> +struct _kvm_stats_header kvm_vm_stats_header = {
> +       .name_size = KVM_STATS_NAME_LEN,
> +       .count = ARRAY_SIZE(kvm_vm_stats_desc),
> +       .desc_offset = sizeof(struct kvm_stats_header),
> +       .data_offset = sizeof(struct kvm_stats_header) +
> +               sizeof(kvm_vm_stats_desc),
> +};
> +
> +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
> +       STATS_DESC_COUNTER("exit_userspace"),
> +       STATS_DESC_COUNTER("exit_null"),
> +       STATS_DESC_COUNTER("exit_external_request"),
> +       STATS_DESC_COUNTER("exit_io_request"),
> +       STATS_DESC_COUNTER("exit_external_interrupt"),
> +       STATS_DESC_COUNTER("exit_stop_request"),
> +       STATS_DESC_COUNTER("exit_validity"),
> +       STATS_DESC_COUNTER("exit_instruction"),
> +       STATS_DESC_COUNTER("exit_pei"),
> +       STATS_DESC_COUNTER("halt_no_poll_steal"),
> +       STATS_DESC_COUNTER("instruction_lctl"),
> +       STATS_DESC_COUNTER("instruction_lctlg"),
> +       STATS_DESC_COUNTER("instruction_stctl"),
> +       STATS_DESC_COUNTER("instruction_stctg"),
> +       STATS_DESC_COUNTER("exit_program_interruption"),
> +       STATS_DESC_COUNTER("exit_instr_and_program"),
> +       STATS_DESC_COUNTER("exit_operation_exception"),
> +       STATS_DESC_COUNTER("deliver_ckc"),
> +       STATS_DESC_COUNTER("deliver_cputm"),
> +       STATS_DESC_COUNTER("deliver_external_call"),
> +       STATS_DESC_COUNTER("deliver_emergency_signal"),
> +       STATS_DESC_COUNTER("deliver_service_signal"),
> +       STATS_DESC_COUNTER("deliver_virtio"),
> +       STATS_DESC_COUNTER("deliver_stop_signal"),
> +       STATS_DESC_COUNTER("deliver_prefix_signal"),
> +       STATS_DESC_COUNTER("deliver_restart_signal"),
> +       STATS_DESC_COUNTER("deliver_program"),
> +       STATS_DESC_COUNTER("deliver_io"),
> +       STATS_DESC_COUNTER("deliver_machine_check"),
> +       STATS_DESC_COUNTER("exit_wait_state"),
> +       STATS_DESC_COUNTER("inject_ckc"),
> +       STATS_DESC_COUNTER("inject_cputm"),
> +       STATS_DESC_COUNTER("inject_external_call"),
> +       STATS_DESC_COUNTER("inject_emergency_signal"),
> +       STATS_DESC_COUNTER("inject_mchk"),
> +       STATS_DESC_COUNTER("inject_pfault_init"),
> +       STATS_DESC_COUNTER("inject_program"),
> +       STATS_DESC_COUNTER("inject_restart"),
> +       STATS_DESC_COUNTER("inject_set_prefix"),
> +       STATS_DESC_COUNTER("inject_stop_signal"),
> +       STATS_DESC_COUNTER("instruction_epsw"),
> +       STATS_DESC_COUNTER("instruction_gs"),
> +       STATS_DESC_COUNTER("instruction_io_other"),
> +       STATS_DESC_COUNTER("instruction_lpsw"),
> +       STATS_DESC_COUNTER("instruction_lpswe"),
> +       STATS_DESC_COUNTER("instruction_pfmf"),
> +       STATS_DESC_COUNTER("instruction_ptff"),
> +       STATS_DESC_COUNTER("instruction_sck"),
> +       STATS_DESC_COUNTER("instruction_sckpf"),
> +       STATS_DESC_COUNTER("instruction_stidp"),
> +       STATS_DESC_COUNTER("instruction_spx"),
> +       STATS_DESC_COUNTER("instruction_stpx"),
> +       STATS_DESC_COUNTER("instruction_stap"),
> +       STATS_DESC_COUNTER("instruction_iske"),
> +       STATS_DESC_COUNTER("instruction_ri"),
> +       STATS_DESC_COUNTER("instruction_rrbe"),
> +       STATS_DESC_COUNTER("instruction_sske"),
> +       STATS_DESC_COUNTER("instruction_ipte_interlock"),
> +       STATS_DESC_COUNTER("instruction_stsi"),
> +       STATS_DESC_COUNTER("instruction_stfl"),
> +       STATS_DESC_COUNTER("instruction_tb"),
> +       STATS_DESC_COUNTER("instruction_tpi"),
> +       STATS_DESC_COUNTER("instruction_tprot"),
> +       STATS_DESC_COUNTER("instruction_tsch"),
> +       STATS_DESC_COUNTER("instruction_sie"),
> +       STATS_DESC_COUNTER("instruction_essa"),
> +       STATS_DESC_COUNTER("instruction_sthyi"),
> +       STATS_DESC_COUNTER("instruction_sigp_sense"),
> +       STATS_DESC_COUNTER("instruction_sigp_sense_running"),
> +       STATS_DESC_COUNTER("instruction_sigp_external_call"),
> +       STATS_DESC_COUNTER("instruction_sigp_emergency"),
> +       STATS_DESC_COUNTER("instruction_sigp_cond_emergency"),
> +       STATS_DESC_COUNTER("instruction_sigp_start"),
> +       STATS_DESC_COUNTER("instruction_sigp_stop"),
> +       STATS_DESC_COUNTER("instruction_sigp_stop_store_status"),
> +       STATS_DESC_COUNTER("instruction_sigp_store_status"),
> +       STATS_DESC_COUNTER("instruction_sigp_store_adtl_status"),
> +       STATS_DESC_COUNTER("instruction_sigp_arch"),
> +       STATS_DESC_COUNTER("instruction_sigp_prefix"),
> +       STATS_DESC_COUNTER("instruction_sigp_restart"),
> +       STATS_DESC_COUNTER("instruction_sigp_init_cpu_reset"),
> +       STATS_DESC_COUNTER("instruction_sigp_cpu_reset"),
> +       STATS_DESC_COUNTER("instruction_sigp_unknown"),
> +       STATS_DESC_COUNTER("diagnose_10"),
> +       STATS_DESC_COUNTER("diagnose_44"),
> +       STATS_DESC_COUNTER("diagnose_9c"),
> +       STATS_DESC_COUNTER("diagnose_9c_ignored"),
> +       STATS_DESC_COUNTER("diagnose_258"),
> +       STATS_DESC_COUNTER("diagnose_308"),
> +       STATS_DESC_COUNTER("diagnose_500"),
> +       STATS_DESC_COUNTER("diagnose_other"),
> +       STATS_DESC_COUNTER("pfault_sync"));
> +
> +struct _kvm_stats_header kvm_vcpu_stats_header = {
> +       .name_size = KVM_STATS_NAME_LEN,
> +       .count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> +       .desc_offset = sizeof(struct kvm_stats_header),
> +       .data_offset = sizeof(struct kvm_stats_header) +
> +               sizeof(kvm_vcpu_stats_desc),
> +};
> +
>  struct kvm_stats_debugfs_item debugfs_entries[] = {
>         VCPU_STAT("userspace_handled", exit_userspace),
>         VCPU_STAT("exit_null", exit_null),
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index 9a93d80caff6..84880687c199 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -214,6 +214,59 @@ EXPORT_SYMBOL_GPL(host_xss);
>  u64 __read_mostly supported_xss;
>  EXPORT_SYMBOL_GPL(supported_xss);
>
> +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(
> +       STATS_DESC_COUNTER("mmu_shadow_zapped"),
> +       STATS_DESC_COUNTER("mmu_pte_write"),
> +       STATS_DESC_COUNTER("mmu_pde_zapped"),
> +       STATS_DESC_COUNTER("mmu_flooded"),
> +       STATS_DESC_COUNTER("mmu_recycled"),
> +       STATS_DESC_COUNTER("mmu_cache_miss"),
> +       STATS_DESC_ICOUNTER("mmu_unsync"),
> +       STATS_DESC_ICOUNTER("largepages"),
> +       STATS_DESC_ICOUNTER("nx_largepages_splits"),
> +       STATS_DESC_ICOUNTER("max_mmu_page_hash_collisions"));
> +
> +struct _kvm_stats_header kvm_vm_stats_header = {
> +       .name_size = KVM_STATS_NAME_LEN,
> +       .count = ARRAY_SIZE(kvm_vm_stats_desc),
> +       .desc_offset = sizeof(struct kvm_stats_header),
> +       .data_offset = sizeof(struct kvm_stats_header) +
> +               sizeof(kvm_vm_stats_desc),
> +};
> +
> +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
> +       STATS_DESC_COUNTER("pf_fixed"),
> +       STATS_DESC_COUNTER("pf_guest"),
> +       STATS_DESC_COUNTER("tlb_flush"),
> +       STATS_DESC_COUNTER("invlpg"),
> +       STATS_DESC_COUNTER("exits"),
> +       STATS_DESC_COUNTER("io_exits"),
> +       STATS_DESC_COUNTER("mmio_exits"),
> +       STATS_DESC_COUNTER("signal_exits"),
> +       STATS_DESC_COUNTER("irq_window_exits"),
> +       STATS_DESC_COUNTER("nmi_window_exits"),
> +       STATS_DESC_COUNTER("l1d_flush"),
> +       STATS_DESC_COUNTER("halt_exits"),
> +       STATS_DESC_COUNTER("request_irq_exits"),
> +       STATS_DESC_COUNTER("irq_exits"),
> +       STATS_DESC_COUNTER("host_state_reload"),
> +       STATS_DESC_COUNTER("fpu_reload"),
> +       STATS_DESC_COUNTER("insn_emulation"),
> +       STATS_DESC_COUNTER("insn_emulation_fail"),
> +       STATS_DESC_COUNTER("hypercalls"),
> +       STATS_DESC_COUNTER("irq_injections"),
> +       STATS_DESC_COUNTER("nmi_injections"),
> +       STATS_DESC_COUNTER("req_event"),
> +       STATS_DESC_COUNTER("nested_run"));
> +
> +struct _kvm_stats_header kvm_vcpu_stats_header = {
> +       .name_size = KVM_STATS_NAME_LEN,
> +       .count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> +       .desc_offset = sizeof(struct kvm_stats_header),
> +       .data_offset = sizeof(struct kvm_stats_header) +
> +               sizeof(kvm_vcpu_stats_desc),
> +};
> +
>  struct kvm_stats_debugfs_item debugfs_entries[] = {
>         VCPU_STAT("pf_fixed", pf_fixed),
>         VCPU_STAT("pf_guest", pf_guest),
> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> index 97700e41db3b..c0a8e6ddc745 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -1240,6 +1240,19 @@ struct kvm_stats_debugfs_item {
>         int mode;
>  };
>
> +struct _kvm_stats_header {
> +       __u32 name_size;
> +       __u32 count;
> +       __u32 desc_offset;
> +       __u32 data_offset;
> +};
> +
> +#define KVM_STATS_NAME_LEN     48
> +struct _kvm_stats_desc {
> +       struct kvm_stats_desc desc;
> +       char name[KVM_STATS_NAME_LEN];
> +};
> +
>  #define KVM_DBGFS_GET_MODE(dbgfs_item)                                         \
>         ((dbgfs_item)->mode ? (dbgfs_item)->mode : 0644)
>
> @@ -1253,8 +1266,127 @@ struct kvm_stats_debugfs_item {
>         { n, offsetof(struct kvm_vcpu, stat.common.x),                         \
>           KVM_STAT_VCPU, ## __VA_ARGS__ }
>
> +#define STATS_DESC(stat, type, unit, scale, exp)                              \
> +       {                                                                      \
> +               {                                                              \

.desc = {

> +                       .flags = type | unit | scale,                          \
> +                       .exponent = exp,                                       \
> +                       .size = 1                                              \
> +               },                                                             \
> +               .name = stat,                                                  \
> +       }
> +#define STATS_DESC_CUMULATIVE(name, unit, scale, exponent)                    \
> +       STATS_DESC(name, KVM_STATS_TYPE_CUMULATIVE, unit, scale, exponent)
> +#define STATS_DESC_INSTANT(name, unit, scale, exponent)                               \
> +       STATS_DESC(name, KVM_STATS_TYPE_INSTANT, unit, scale, exponent)
> +
> +/* Cumulative counter */
> +#define STATS_DESC_COUNTER(name)                                              \
> +       STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_NONE,                       \
> +               KVM_STATS_BASE_POW10, 0)
> +/* Instantaneous counter */
> +#define STATS_DESC_ICOUNTER(name)                                             \
> +       STATS_DESC_INSTANT(name, KVM_STATS_UNIT_NONE,                          \
> +               KVM_STATS_BASE_POW10, 0)
> +
> +/* Cumulative clock cycles */
> +#define STATS_DESC_CYCLE(name)                                                \
> +       STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_CYCLES,                     \
> +               KVM_STATS_BASE_POW10, 0)
> +/* Instantaneous clock cycles */
> +#define STATS_DESC_ICYCLE(name)                                                       \
> +       STATS_DESC_INSTANT(name, KVM_STATS_UNIT_CYCLES,                        \
> +               KVM_STATS_BASE_POW10, 0)
> +
> +/* Cumulative memory size in Byte */
> +#define STATS_DESC_SIZE_BYTE(name)                                            \
> +       STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES,                      \
> +               KVM_STATS_BASE_POW2, 0)
> +/* Cumulative memory size in KiByte */
> +#define STATS_DESC_SIZE_KBYTE(name)                                           \
> +       STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES,                      \
> +               KVM_STATS_BASE_POW2, 10)
> +/* Cumulative memory size in MiByte */
> +#define STATS_DESC_SIZE_MBYTE(name)                                           \
> +       STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES,                      \
> +               KVM_STATS_BASE_POW2, 20)
> +/* Cumulative memory size in GiByte */
> +#define STATS_DESC_SIZE_GBYTE(name)                                           \
> +       STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES,                      \
> +               KVM_STATS_BASE_POW2, 30)
> +
> +/* Instantaneous memory size in Byte */
> +#define STATS_DESC_ISIZE_BYTE(name)                                           \
> +       STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES,                         \
> +               KVM_STATS_BASE_POW2, 0)
> +/* Instantaneous memory size in KiByte */
> +#define STATS_DESC_ISIZE_KBYTE(name)                                          \
> +       STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES,                         \
> +               KVM_STATS_BASE_POW2, 10)
> +/* Instantaneous memory size in MiByte */
> +#define STATS_DESC_ISIZE_MBYTE(name)                                          \
> +       STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES,                         \
> +               KVM_STATS_BASE_POW2, 20)
> +/* Instantaneous memory size in GiByte */
> +#define STATS_DESC_ISIZE_GBYTE(name)                                          \
> +       STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES,                         \
> +               KVM_STATS_BASE_POW2, 30)
> +
> +/* Cumulative time in second */
> +#define STATS_DESC_TIME_SEC(name)                                             \
> +       STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS,                    \
> +               KVM_STATS_BASE_POW10, 0)
> +/* Cumulative time in millisecond */
> +#define STATS_DESC_TIME_MSEC(name)                                            \
> +       STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS,                    \
> +               KVM_STATS_BASE_POW10, -3)
> +/* Cumulative time in microsecond */
> +#define STATS_DESC_TIME_USEC(name)                                            \
> +       STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS,                    \
> +               KVM_STATS_BASE_POW10, -6)
> +/* Cumulative time in nanosecond */
> +#define STATS_DESC_TIME_NSEC(name)                                            \
> +       STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS,                    \
> +               KVM_STATS_BASE_POW10, -9)
> +
> +/* Instantaneous time in second */
> +#define STATS_DESC_ITIME_SEC(name)                                            \
> +       STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS,                       \
> +               KVM_STATS_BASE_POW10, 0)
> +/* Instantaneous time in millisecond */
> +#define STATS_DESC_ITIME_MSEC(name)                                           \
> +       STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS,                       \
> +               KVM_STATS_BASE_POW10, -3)
> +/* Instantaneous time in microsecond */
> +#define STATS_DESC_ITIME_USEC(name)                                           \
> +       STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS,                       \
> +               KVM_STATS_BASE_POW10, -6)
> +/* Instantaneous time in nanosecond */
> +#define STATS_DESC_ITIME_NSEC(name)                                           \
> +       STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS,                       \
> +               KVM_STATS_BASE_POW10, -9)
> +
> +#define DEFINE_VM_STATS_DESC(...) {                                           \
> +       STATS_DESC_COUNTER("remote_tlb_flush"),                                \
> +       ## __VA_ARGS__                                                         \
> +}
> +
> +#define DEFINE_VCPU_STATS_DESC(...) {                                         \
> +       STATS_DESC_COUNTER("halt_successful_poll"),                            \
> +       STATS_DESC_COUNTER("halt_attempted_poll"),                             \
> +       STATS_DESC_COUNTER("halt_poll_invalid"),                               \
> +       STATS_DESC_COUNTER("halt_wakeup"),                                     \
> +       STATS_DESC_TIME_NSEC("halt_poll_success_ns"),                          \
> +       STATS_DESC_TIME_NSEC("halt_poll_fail_ns"),                             \
> +       ## __VA_ARGS__                                                         \
> +}
> +
>  extern struct kvm_stats_debugfs_item debugfs_entries[];
>  extern struct dentry *kvm_debugfs_dir;
> +extern struct _kvm_stats_header kvm_vm_stats_header;
> +extern struct _kvm_stats_header kvm_vcpu_stats_header;
> +extern struct _kvm_stats_desc kvm_vm_stats_desc[];
> +extern struct _kvm_stats_desc kvm_vcpu_stats_desc[];
>
>  #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
>  static inline int mmu_notifier_retry(struct kvm *kvm, unsigned long mmu_seq)
> diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
> index 3fd9a7e9d90c..82db825c392c 100644
> --- a/include/uapi/linux/kvm.h
> +++ b/include/uapi/linux/kvm.h
> @@ -1082,6 +1082,7 @@ struct kvm_ppc_resize_hpt {
>  #define KVM_CAP_SGX_ATTRIBUTE 196
>  #define KVM_CAP_VM_COPY_ENC_CONTEXT_FROM 197
>  #define KVM_CAP_PTP_KVM 198
> +#define KVM_CAP_STATS_BINARY_FD 199
>
>  #ifdef KVM_CAP_IRQ_ROUTING
>
> @@ -1898,4 +1899,53 @@ struct kvm_dirty_gfn {
>  #define KVM_BUS_LOCK_DETECTION_OFF             (1 << 0)
>  #define KVM_BUS_LOCK_DETECTION_EXIT            (1 << 1)
>
> +#define KVM_STATS_ID_MAXLEN            64
> +
> +struct kvm_stats_header {
> +       char id[KVM_STATS_ID_MAXLEN];
> +       __u32 name_size;
> +       __u32 count;
> +       __u32 desc_offset;
> +       __u32 data_offset;
> +};
> +
> +#define KVM_STATS_TYPE_SHIFT           0
> +#define KVM_STATS_TYPE_MASK            (0xF << KVM_STATS_TYPE_SHIFT)
> +#define KVM_STATS_TYPE_CUMULATIVE      (0x0 << KVM_STATS_TYPE_SHIFT)
> +#define KVM_STATS_TYPE_INSTANT         (0x1 << KVM_STATS_TYPE_SHIFT)
> +#define KVM_STATS_TYPE_MAX             KVM_STATS_TYPE_INSTANT
> +
> +#define KVM_STATS_UNIT_SHIFT           4
> +#define KVM_STATS_UNIT_MASK            (0xF << KVM_STATS_UNIT_SHIFT)
> +#define KVM_STATS_UNIT_NONE            (0x0 << KVM_STATS_UNIT_SHIFT)
> +#define KVM_STATS_UNIT_BYTES           (0x1 << KVM_STATS_UNIT_SHIFT)
> +#define KVM_STATS_UNIT_SECONDS         (0x2 << KVM_STATS_UNIT_SHIFT)
> +#define KVM_STATS_UNIT_CYCLES          (0x3 << KVM_STATS_UNIT_SHIFT)
> +#define KVM_STATS_UNIT_MAX             KVM_STATS_UNIT_CYCLES
> +
> +#define KVM_STATS_BASE_SHIFT           8
> +#define KVM_STATS_BASE_MASK            (0xF << KVM_STATS_BASE_SHIFT)
> +#define KVM_STATS_BASE_POW10           (0x0 << KVM_STATS_BASE_SHIFT)
> +#define KVM_STATS_BASE_POW2            (0x1 << KVM_STATS_BASE_SHIFT)
> +#define KVM_STATS_BASE_MAX             KVM_STATS_BASE_POW2
> +
> +struct kvm_stats_desc {
> +       __u32 flags;
> +       __s16 exponent;
> +       __u16 size;
> +       __u32 unused1;
> +       __u32 unused2;
> +       char name[0];
> +};
> +
> +struct kvm_vm_stats_data {
> +       unsigned long value[0];
> +};
> +
> +struct kvm_vcpu_stats_data {
> +       __u64 value[0];
> +};
> +
> +#define KVM_STATS_GETFD  _IOR(KVMIO,  0xcc, struct kvm_stats_header)
> +
>  #endif /* __LINUX_KVM_H */
> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> index 34a4cf265297..9e20e2ff78b4 100644
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -3409,6 +3409,120 @@ static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
>         return 0;
>  }
>
> +static ssize_t kvm_stats_read(char *id, struct _kvm_stats_header *header,
> +               struct _kvm_stats_desc *desc, void *stats, size_t size_stats,
> +               char __user *user_buffer, size_t size, loff_t *offset)
> +{
> +       ssize_t copylen, len, remain = size;
> +       size_t size_header, size_desc;
> +       loff_t pos = *offset;
> +       char __user *dest = user_buffer;
> +       void *src;
> +
> +       size_header = sizeof(*header);
> +       size_desc = header->count * sizeof(*desc);
> +
> +       len = KVM_STATS_ID_MAXLEN + size_header + size_desc + size_stats - pos;
> +       len = min(len, remain);
> +       if (len <= 0)
> +               return 0;
> +       remain = len;
> +
> +       /* Copy kvm stats header id string */
> +       copylen = KVM_STATS_ID_MAXLEN - pos;
> +       copylen = min(copylen, remain);
> +       if (copylen > 0) {
> +               src = id + pos;
> +               if (copy_to_user(dest, src, copylen))
> +                       return -EFAULT;
> +               remain -= copylen;
> +               pos += copylen;
> +               dest += copylen;
> +       }
> +       /* Copy kvm stats header */
> +       copylen = KVM_STATS_ID_MAXLEN + size_header - pos;
> +       copylen = min(copylen, remain);
> +       if (copylen > 0) {
> +               src = header + pos - KVM_STATS_ID_MAXLEN;
> +               if (copy_to_user(dest, src, copylen))
> +                       return -EFAULT;
> +               remain -= copylen;
> +               pos += copylen;
> +               dest += copylen;
> +       }
> +       /* Copy kvm stats descriptors */
> +       copylen = header->desc_offset + size_desc - pos;
> +       copylen = min(copylen, remain);
> +       if (copylen > 0) {
> +               src = desc + pos - header->desc_offset;
> +               if (copy_to_user(dest, src, copylen))
> +                       return -EFAULT;
> +               remain -= copylen;
> +               pos += copylen;
> +               dest += copylen;
> +       }
> +       /* Copy kvm stats values */
> +       copylen = header->data_offset + size_stats - pos;
> +       copylen = min(copylen, remain);
> +       if (copylen > 0) {
> +               src = stats + pos - header->data_offset;
> +               if (copy_to_user(dest, src, copylen))
> +                       return -EFAULT;
> +               remain -= copylen;
> +               pos += copylen;
> +               dest += copylen;
> +       }
> +
> +       *offset = pos;
> +       return len;
> +}
> +
> +static ssize_t kvm_vcpu_stats_read(struct file *file, char __user *user_buffer,
> +                             size_t size, loff_t *offset)
> +{
> +       char id[KVM_STATS_ID_MAXLEN];
> +       struct kvm_vcpu *vcpu = file->private_data;
> +
> +       snprintf(id, sizeof(id), "kvm-%d/vcpu-%d",
> +                       task_pid_nr(current), vcpu->vcpu_id);
> +       return kvm_stats_read(id, &kvm_vcpu_stats_header,
> +                       &kvm_vcpu_stats_desc[0], &vcpu->stat,
> +                       sizeof(vcpu->stat), user_buffer, size, offset);
> +}
> +
> +static const struct file_operations kvm_vcpu_stats_fops = {
> +       .read = kvm_vcpu_stats_read,
> +       .llseek = noop_llseek,
> +};
> +
> +static int kvm_vcpu_ioctl_get_statsfd(struct kvm_vcpu *vcpu)
> +{
> +       int error, fd;
> +       struct file *file;
> +       char name[15 + ITOA_MAX_LEN + 1];
> +
> +       snprintf(name, sizeof(name), "kvm-vcpu-stats:%d", vcpu->vcpu_id);
> +
> +       error = get_unused_fd_flags(O_CLOEXEC);
> +       if (error < 0)
> +               return error;
> +       fd = error;
> +
> +       file = anon_inode_getfile(name, &kvm_vcpu_stats_fops, vcpu, O_RDONLY);
> +       if (IS_ERR(file)) {
> +               error = PTR_ERR(file);
> +               goto err_put_unused_fd;
> +       }
> +       file->f_mode |= FMODE_PREAD;
> +       fd_install(fd, file);
> +
> +       return fd;
> +
> +err_put_unused_fd:
> +       put_unused_fd(fd);
> +       return error;
> +}
> +
>  static long kvm_vcpu_ioctl(struct file *filp,
>                            unsigned int ioctl, unsigned long arg)
>  {
> @@ -3606,6 +3720,10 @@ static long kvm_vcpu_ioctl(struct file *filp,
>                 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
>                 break;
>         }
> +       case KVM_STATS_GETFD: {
> +               r = kvm_vcpu_ioctl_get_statsfd(vcpu);
> +               break;
> +       }
>         default:
>                 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
>         }
> @@ -3864,6 +3982,8 @@ static long kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg)
>  #else
>                 return 0;
>  #endif
> +       case KVM_CAP_STATS_BINARY_FD:
> +               return 1;
>         default:
>                 break;
>         }
> @@ -3967,6 +4087,48 @@ static int kvm_vm_ioctl_enable_cap_generic(struct kvm *kvm,
>         }
>  }
>
> +static ssize_t kvm_vm_stats_read(struct file *file, char __user *user_buffer,
> +                             size_t size, loff_t *offset)
> +{
> +       char id[KVM_STATS_ID_MAXLEN];
> +       struct kvm *kvm = file->private_data;
> +
> +       snprintf(id, sizeof(id), "kvm-%d", task_pid_nr(current));
> +       return kvm_stats_read(id, &kvm_vm_stats_header, &kvm_vm_stats_desc[0],
> +               &kvm->stat, sizeof(kvm->stat), user_buffer, size, offset);
> +}
> +
> +static const struct file_operations kvm_vm_stats_fops = {
> +       .read = kvm_vm_stats_read,
> +       .llseek = noop_llseek,
> +};
> +
> +static int kvm_vm_ioctl_get_statsfd(struct kvm *kvm)
> +{
> +       int error, fd;
> +       struct file *file;
> +
> +       error = get_unused_fd_flags(O_CLOEXEC);
> +       if (error < 0)
> +               return error;
> +       fd = error;
> +
> +       file = anon_inode_getfile("kvm-vm-stats",
> +                       &kvm_vm_stats_fops, kvm, O_RDONLY);
> +       if (IS_ERR(file)) {
> +               error = PTR_ERR(file);
> +               goto err_put_unused_fd;
> +       }
> +       file->f_mode |= FMODE_PREAD;
> +       fd_install(fd, file);
> +
> +       return fd;
> +
> +err_put_unused_fd:
> +       put_unused_fd(fd);
> +       return error;
> +}
> +
>  static long kvm_vm_ioctl(struct file *filp,
>                            unsigned int ioctl, unsigned long arg)
>  {
> @@ -4149,6 +4311,9 @@ static long kvm_vm_ioctl(struct file *filp,
>         case KVM_RESET_DIRTY_RINGS:
>                 r = kvm_vm_ioctl_reset_dirty_pages(kvm);
>                 break;
> +       case KVM_STATS_GETFD:
> +               r = kvm_vm_ioctl_get_statsfd(kvm);
> +               break;
>         default:
>                 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
>         }
> --
> 2.31.1.818.g46aad6cb9e-goog
>

Re: [PATCH v6 2/4] KVM: stats: Add fd-based API to read binary stats data

[David Matlack]

On Mon, May 24, 2021 at 8:18 AM Jing Zhang <jingzhangos@google.com> wrote:
>
> Provides a file descriptor per VM to read VM stats info/data.
> Provides a file descriptor per vCPU to read vCPU stats info/data.
>
> Reviewed-by: David Matlack <dmatlack@google.com>
> Reviewed-by: Ricardo Koller <ricarkol@google.com>
> Signed-off-by: Jing Zhang <jingzhangos@google.com>

Looks good. Just some optional nits to consider if you do a v7.

Reviewed-by: David Matlack <dmatlack@google.com>

> ---
>  arch/arm64/kvm/guest.c    |  26 ++++++
>  arch/mips/kvm/mips.c      |  52 ++++++++++++
>  arch/powerpc/kvm/book3s.c |  52 ++++++++++++
>  arch/powerpc/kvm/booke.c  |  45 +++++++++++
>  arch/s390/kvm/kvm-s390.c  | 117 +++++++++++++++++++++++++++
>  arch/x86/kvm/x86.c        |  53 ++++++++++++
>  include/linux/kvm_host.h  | 132 ++++++++++++++++++++++++++++++
>  include/uapi/linux/kvm.h  |  50 ++++++++++++
>  virt/kvm/kvm_main.c       | 165 ++++++++++++++++++++++++++++++++++++++
>  9 files changed, 692 insertions(+)
>
> diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
> index 0e41331b0911..1cc1d83630ac 100644
> --- a/arch/arm64/kvm/guest.c
> +++ b/arch/arm64/kvm/guest.c
> @@ -28,6 +28,32 @@
>
>  #include "trace.h"
>
> +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC();
> +
> +struct _kvm_stats_header kvm_vm_stats_header = {
> +       .name_size = KVM_STATS_NAME_LEN,
> +       .count = ARRAY_SIZE(kvm_vm_stats_desc),
> +       .desc_offset = sizeof(struct kvm_stats_header),
> +       .data_offset = sizeof(struct kvm_stats_header) +
> +               sizeof(kvm_vm_stats_desc),
> +};

nit: Defining the same _kvm_stats_header struct for each arch seems a
bit superfluous? Alternatively you could define them once in
kvm_main.c, or omit them entirely and generate the kvm_stats_header on
the fly when reading the file.


> +
> +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
> +       STATS_DESC_COUNTER("hvc_exit_stat"),
> +       STATS_DESC_COUNTER("wfe_exit_stat"),
> +       STATS_DESC_COUNTER("wfi_exit_stat"),
> +       STATS_DESC_COUNTER("mmio_exit_user"),
> +       STATS_DESC_COUNTER("mmio_exit_kernel"),
> +       STATS_DESC_COUNTER("exits"));
> +
> +struct _kvm_stats_header kvm_vcpu_stats_header = {
> +       .name_size = KVM_STATS_NAME_LEN,
> +       .count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> +       .desc_offset = sizeof(struct kvm_stats_header),
> +       .data_offset = sizeof(struct kvm_stats_header) +
> +               sizeof(kvm_vcpu_stats_desc),
> +};
> +
>  struct kvm_stats_debugfs_item debugfs_entries[] = {
>         VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
>         VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
> index f4fc60c05e9c..f17a65743ccd 100644
> --- a/arch/mips/kvm/mips.c
> +++ b/arch/mips/kvm/mips.c
> @@ -38,6 +38,58 @@
>  #define VECTORSPACING 0x100    /* for EI/VI mode */
>  #endif
>
> +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC();
> +
> +struct _kvm_stats_header kvm_vm_stats_header = {
> +       .name_size = KVM_STATS_NAME_LEN,
> +       .count = ARRAY_SIZE(kvm_vm_stats_desc),
> +       .desc_offset = sizeof(struct kvm_stats_header),
> +       .data_offset = sizeof(struct kvm_stats_header) +
> +               sizeof(kvm_vm_stats_desc),
> +};
> +
> +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
> +       STATS_DESC_COUNTER("wait_exits"),
> +       STATS_DESC_COUNTER("cache_exits"),
> +       STATS_DESC_COUNTER("signal_exits"),
> +       STATS_DESC_COUNTER("int_exits"),
> +       STATS_DESC_COUNTER("cop_unusable_exits"),
> +       STATS_DESC_COUNTER("tlbmod_exits"),
> +       STATS_DESC_COUNTER("tlbmiss_ld_exits"),
> +       STATS_DESC_COUNTER("tlbmiss_st_exits"),
> +       STATS_DESC_COUNTER("addrerr_st_exits"),
> +       STATS_DESC_COUNTER("addrerr_ld_exits"),
> +       STATS_DESC_COUNTER("syscall_exits"),
> +       STATS_DESC_COUNTER("resvd_inst_exits"),
> +       STATS_DESC_COUNTER("break_inst_exits"),
> +       STATS_DESC_COUNTER("trap_inst_exits"),
> +       STATS_DESC_COUNTER("msa_fpe_exits"),
> +       STATS_DESC_COUNTER("fpe_exits"),
> +       STATS_DESC_COUNTER("msa_disabled_exits"),
> +       STATS_DESC_COUNTER("flush_dcache_exits"),
> +#ifdef CONFIG_KVM_MIPS_VZ
> +       STATS_DESC_COUNTER("vz_gpsi_exits"),
> +       STATS_DESC_COUNTER("vz_gsfc_exits"),
> +       STATS_DESC_COUNTER("vz_hc_exits"),
> +       STATS_DESC_COUNTER("vz_grr_exits"),
> +       STATS_DESC_COUNTER("vz_gva_exits"),
> +       STATS_DESC_COUNTER("vz_ghfc_exits"),
> +       STATS_DESC_COUNTER("vz_gpa_exits"),
> +       STATS_DESC_COUNTER("vz_resvd_exits"),
> +#ifdef CONFIG_CPU_LOONGSON64
> +       STATS_DESC_COUNTER("vz_cpucfg_exits"),
> +#endif
> +#endif
> +       );
> +
> +struct _kvm_stats_header kvm_vcpu_stats_header = {
> +       .name_size = KVM_STATS_NAME_LEN,
> +       .count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> +       .desc_offset = sizeof(struct kvm_stats_header),
> +       .data_offset = sizeof(struct kvm_stats_header) +
> +               sizeof(kvm_vcpu_stats_desc),
> +};
> +
>  struct kvm_stats_debugfs_item debugfs_entries[] = {
>         VCPU_STAT("wait", wait_exits),
>         VCPU_STAT("cache", cache_exits),
> diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
> index bd3a10e1fdaf..5e8ee0d39ef9 100644
> --- a/arch/powerpc/kvm/book3s.c
> +++ b/arch/powerpc/kvm/book3s.c
> @@ -38,6 +38,58 @@
>
>  /* #define EXIT_DEBUG */
>
> +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(
> +       STATS_DESC_ICOUNTER("num_2M_pages"),
> +       STATS_DESC_ICOUNTER("num_1G_pages"));
> +
> +struct _kvm_stats_header kvm_vm_stats_header = {
> +       .name_size = KVM_STATS_NAME_LEN,
> +       .count = ARRAY_SIZE(kvm_vm_stats_desc),
> +       .desc_offset = sizeof(struct kvm_stats_header),
> +       .data_offset = sizeof(struct kvm_stats_header) +
> +               sizeof(kvm_vm_stats_desc),
> +};
> +
> +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
> +       STATS_DESC_COUNTER("sum_exits"),
> +       STATS_DESC_COUNTER("mmio_exits"),
> +       STATS_DESC_COUNTER("signal_exits"),
> +       STATS_DESC_COUNTER("light_exits"),
> +       STATS_DESC_COUNTER("itlb_real_miss_exits"),
> +       STATS_DESC_COUNTER("itlb_virt_miss_exits"),
> +       STATS_DESC_COUNTER("dtlb_real_miss_exits"),
> +       STATS_DESC_COUNTER("dtlb_virt_miss_exits"),
> +       STATS_DESC_COUNTER("syscall_exits"),
> +       STATS_DESC_COUNTER("isi_exits"),
> +       STATS_DESC_COUNTER("dsi_exits"),
> +       STATS_DESC_COUNTER("emulated_inst_exits"),
> +       STATS_DESC_COUNTER("dec_exits"),
> +       STATS_DESC_COUNTER("ext_intr_exits"),
> +       STATS_DESC_TIME_NSEC("halt_wait_ns"),
> +       STATS_DESC_COUNTER("halt_successful_wait"),
> +       STATS_DESC_COUNTER("dbell_exits"),
> +       STATS_DESC_COUNTER("gdbell_exits"),
> +       STATS_DESC_COUNTER("ld"),
> +       STATS_DESC_COUNTER("st"),
> +       STATS_DESC_COUNTER("pf_storage"),
> +       STATS_DESC_COUNTER("pf_instruc"),
> +       STATS_DESC_COUNTER("sp_storage"),
> +       STATS_DESC_COUNTER("sp_instruc"),
> +       STATS_DESC_COUNTER("queue_intr"),
> +       STATS_DESC_COUNTER("ld_slow"),
> +       STATS_DESC_COUNTER("st_slow"),
> +       STATS_DESC_COUNTER("pthru_all"),
> +       STATS_DESC_COUNTER("pthru_host"),
> +       STATS_DESC_COUNTER("pthru_bad_aff"));
> +
> +struct _kvm_stats_header kvm_vcpu_stats_header = {
> +       .name_size = KVM_STATS_NAME_LEN,
> +       .count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> +       .desc_offset = sizeof(struct kvm_stats_header),
> +       .data_offset = sizeof(struct kvm_stats_header) +
> +               sizeof(kvm_vcpu_stats_desc),
> +};
> +
>  struct kvm_stats_debugfs_item debugfs_entries[] = {
>         VCPU_STAT("exits", sum_exits),
>         VCPU_STAT("mmio", mmio_exits),
> diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
> index 07fdd7a1254a..86d221e9193e 100644
> --- a/arch/powerpc/kvm/booke.c
> +++ b/arch/powerpc/kvm/booke.c
> @@ -36,6 +36,51 @@
>
>  unsigned long kvmppc_booke_handlers;
>
> +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(
> +       STATS_DESC_ICOUNTER("num_2M_pages"),
> +       STATS_DESC_ICOUNTER("num_1G_pages"));
> +
> +struct _kvm_stats_header kvm_vm_stats_header = {
> +       .name_size = KVM_STATS_NAME_LEN,
> +       .count = ARRAY_SIZE(kvm_vm_stats_desc),
> +       .desc_offset = sizeof(struct kvm_stats_header),
> +       .data_offset = sizeof(struct kvm_stats_header) +
> +               sizeof(kvm_vm_stats_desc),
> +};
> +
> +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
> +       STATS_DESC_COUNTER("sum_exits"),
> +       STATS_DESC_COUNTER("mmio_exits"),
> +       STATS_DESC_COUNTER("signal_exits"),
> +       STATS_DESC_COUNTER("light_exits"),
> +       STATS_DESC_COUNTER("itlb_real_miss_exits"),
> +       STATS_DESC_COUNTER("itlb_virt_miss_exits"),
> +       STATS_DESC_COUNTER("dtlb_real_miss_exits"),
> +       STATS_DESC_COUNTER("dtlb_virt_miss_exits"),
> +       STATS_DESC_COUNTER("syscall_exits"),
> +       STATS_DESC_COUNTER("isi_exits"),
> +       STATS_DESC_COUNTER("dsi_exits"),
> +       STATS_DESC_COUNTER("emulated_inst_exits"),
> +       STATS_DESC_COUNTER("dec_exits"),
> +       STATS_DESC_COUNTER("ext_intr_exits"),
> +       STATS_DESC_TIME_NSEC("halt_wait_ns"),
> +       STATS_DESC_COUNTER("halt_successful_wait"),
> +       STATS_DESC_COUNTER("dbell_exits"),
> +       STATS_DESC_COUNTER("gdbell_exits"),
> +       STATS_DESC_COUNTER("ld"),
> +       STATS_DESC_COUNTER("st"),
> +       STATS_DESC_COUNTER("pthru_all"),
> +       STATS_DESC_COUNTER("pthru_host"),
> +       STATS_DESC_COUNTER("pthru_bad_aff"));
> +
> +struct _kvm_stats_header kvm_vcpu_stats_header = {
> +       .name_size = KVM_STATS_NAME_LEN,
> +       .count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> +       .desc_offset = sizeof(struct kvm_stats_header),
> +       .data_offset = sizeof(struct kvm_stats_header) +
> +               sizeof(kvm_vcpu_stats_desc),
> +};
> +
>  struct kvm_stats_debugfs_item debugfs_entries[] = {
>         VCPU_STAT("mmio", mmio_exits),
>         VCPU_STAT("sig", signal_exits),
> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> index d6bf3372bb10..003feee79fce 100644
> --- a/arch/s390/kvm/kvm-s390.c
> +++ b/arch/s390/kvm/kvm-s390.c
> @@ -58,6 +58,123 @@
>  #define VCPU_IRQS_MAX_BUF (sizeof(struct kvm_s390_irq) * \
>                            (KVM_MAX_VCPUS + LOCAL_IRQS))
>
> +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(
> +       STATS_DESC_COUNTER("inject_io"),
> +       STATS_DESC_COUNTER("inject_float_mchk"),
> +       STATS_DESC_COUNTER("inject_pfault_done"),
> +       STATS_DESC_COUNTER("inject_service_signal"),
> +       STATS_DESC_COUNTER("inject_virtio"));
> +
> +struct _kvm_stats_header kvm_vm_stats_header = {
> +       .name_size = KVM_STATS_NAME_LEN,
> +       .count = ARRAY_SIZE(kvm_vm_stats_desc),
> +       .desc_offset = sizeof(struct kvm_stats_header),
> +       .data_offset = sizeof(struct kvm_stats_header) +
> +               sizeof(kvm_vm_stats_desc),
> +};
> +
> +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
> +       STATS_DESC_COUNTER("exit_userspace"),
> +       STATS_DESC_COUNTER("exit_null"),
> +       STATS_DESC_COUNTER("exit_external_request"),
> +       STATS_DESC_COUNTER("exit_io_request"),
> +       STATS_DESC_COUNTER("exit_external_interrupt"),
> +       STATS_DESC_COUNTER("exit_stop_request"),
> +       STATS_DESC_COUNTER("exit_validity"),
> +       STATS_DESC_COUNTER("exit_instruction"),
> +       STATS_DESC_COUNTER("exit_pei"),
> +       STATS_DESC_COUNTER("halt_no_poll_steal"),
> +       STATS_DESC_COUNTER("instruction_lctl"),
> +       STATS_DESC_COUNTER("instruction_lctlg"),
> +       STATS_DESC_COUNTER("instruction_stctl"),
> +       STATS_DESC_COUNTER("instruction_stctg"),
> +       STATS_DESC_COUNTER("exit_program_interruption"),
> +       STATS_DESC_COUNTER("exit_instr_and_program"),
> +       STATS_DESC_COUNTER("exit_operation_exception"),
> +       STATS_DESC_COUNTER("deliver_ckc"),
> +       STATS_DESC_COUNTER("deliver_cputm"),
> +       STATS_DESC_COUNTER("deliver_external_call"),
> +       STATS_DESC_COUNTER("deliver_emergency_signal"),
> +       STATS_DESC_COUNTER("deliver_service_signal"),
> +       STATS_DESC_COUNTER("deliver_virtio"),
> +       STATS_DESC_COUNTER("deliver_stop_signal"),
> +       STATS_DESC_COUNTER("deliver_prefix_signal"),
> +       STATS_DESC_COUNTER("deliver_restart_signal"),
> +       STATS_DESC_COUNTER("deliver_program"),
> +       STATS_DESC_COUNTER("deliver_io"),
> +       STATS_DESC_COUNTER("deliver_machine_check"),
> +       STATS_DESC_COUNTER("exit_wait_state"),
> +       STATS_DESC_COUNTER("inject_ckc"),
> +       STATS_DESC_COUNTER("inject_cputm"),
> +       STATS_DESC_COUNTER("inject_external_call"),
> +       STATS_DESC_COUNTER("inject_emergency_signal"),
> +       STATS_DESC_COUNTER("inject_mchk"),
> +       STATS_DESC_COUNTER("inject_pfault_init"),
> +       STATS_DESC_COUNTER("inject_program"),
> +       STATS_DESC_COUNTER("inject_restart"),
> +       STATS_DESC_COUNTER("inject_set_prefix"),
> +       STATS_DESC_COUNTER("inject_stop_signal"),
> +       STATS_DESC_COUNTER("instruction_epsw"),
> +       STATS_DESC_COUNTER("instruction_gs"),
> +       STATS_DESC_COUNTER("instruction_io_other"),
> +       STATS_DESC_COUNTER("instruction_lpsw"),
> +       STATS_DESC_COUNTER("instruction_lpswe"),
> +       STATS_DESC_COUNTER("instruction_pfmf"),
> +       STATS_DESC_COUNTER("instruction_ptff"),
> +       STATS_DESC_COUNTER("instruction_sck"),
> +       STATS_DESC_COUNTER("instruction_sckpf"),
> +       STATS_DESC_COUNTER("instruction_stidp"),
> +       STATS_DESC_COUNTER("instruction_spx"),
> +       STATS_DESC_COUNTER("instruction_stpx"),
> +       STATS_DESC_COUNTER("instruction_stap"),
> +       STATS_DESC_COUNTER("instruction_iske"),
> +       STATS_DESC_COUNTER("instruction_ri"),
> +       STATS_DESC_COUNTER("instruction_rrbe"),
> +       STATS_DESC_COUNTER("instruction_sske"),
> +       STATS_DESC_COUNTER("instruction_ipte_interlock"),
> +       STATS_DESC_COUNTER("instruction_stsi"),
> +       STATS_DESC_COUNTER("instruction_stfl"),
> +       STATS_DESC_COUNTER("instruction_tb"),
> +       STATS_DESC_COUNTER("instruction_tpi"),
> +       STATS_DESC_COUNTER("instruction_tprot"),
> +       STATS_DESC_COUNTER("instruction_tsch"),
> +       STATS_DESC_COUNTER("instruction_sie"),
> +       STATS_DESC_COUNTER("instruction_essa"),
> +       STATS_DESC_COUNTER("instruction_sthyi"),
> +       STATS_DESC_COUNTER("instruction_sigp_sense"),
> +       STATS_DESC_COUNTER("instruction_sigp_sense_running"),
> +       STATS_DESC_COUNTER("instruction_sigp_external_call"),
> +       STATS_DESC_COUNTER("instruction_sigp_emergency"),
> +       STATS_DESC_COUNTER("instruction_sigp_cond_emergency"),
> +       STATS_DESC_COUNTER("instruction_sigp_start"),
> +       STATS_DESC_COUNTER("instruction_sigp_stop"),
> +       STATS_DESC_COUNTER("instruction_sigp_stop_store_status"),
> +       STATS_DESC_COUNTER("instruction_sigp_store_status"),
> +       STATS_DESC_COUNTER("instruction_sigp_store_adtl_status"),
> +       STATS_DESC_COUNTER("instruction_sigp_arch"),
> +       STATS_DESC_COUNTER("instruction_sigp_prefix"),
> +       STATS_DESC_COUNTER("instruction_sigp_restart"),
> +       STATS_DESC_COUNTER("instruction_sigp_init_cpu_reset"),
> +       STATS_DESC_COUNTER("instruction_sigp_cpu_reset"),
> +       STATS_DESC_COUNTER("instruction_sigp_unknown"),
> +       STATS_DESC_COUNTER("diagnose_10"),
> +       STATS_DESC_COUNTER("diagnose_44"),
> +       STATS_DESC_COUNTER("diagnose_9c"),
> +       STATS_DESC_COUNTER("diagnose_9c_ignored"),
> +       STATS_DESC_COUNTER("diagnose_258"),
> +       STATS_DESC_COUNTER("diagnose_308"),
> +       STATS_DESC_COUNTER("diagnose_500"),
> +       STATS_DESC_COUNTER("diagnose_other"),
> +       STATS_DESC_COUNTER("pfault_sync"));
> +
> +struct _kvm_stats_header kvm_vcpu_stats_header = {
> +       .name_size = KVM_STATS_NAME_LEN,
> +       .count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> +       .desc_offset = sizeof(struct kvm_stats_header),
> +       .data_offset = sizeof(struct kvm_stats_header) +
> +               sizeof(kvm_vcpu_stats_desc),
> +};
> +
>  struct kvm_stats_debugfs_item debugfs_entries[] = {
>         VCPU_STAT("userspace_handled", exit_userspace),
>         VCPU_STAT("exit_null", exit_null),
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index 9a93d80caff6..84880687c199 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -214,6 +214,59 @@ EXPORT_SYMBOL_GPL(host_xss);
>  u64 __read_mostly supported_xss;
>  EXPORT_SYMBOL_GPL(supported_xss);
>
> +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(
> +       STATS_DESC_COUNTER("mmu_shadow_zapped"),
> +       STATS_DESC_COUNTER("mmu_pte_write"),
> +       STATS_DESC_COUNTER("mmu_pde_zapped"),
> +       STATS_DESC_COUNTER("mmu_flooded"),
> +       STATS_DESC_COUNTER("mmu_recycled"),
> +       STATS_DESC_COUNTER("mmu_cache_miss"),
> +       STATS_DESC_ICOUNTER("mmu_unsync"),
> +       STATS_DESC_ICOUNTER("largepages"),
> +       STATS_DESC_ICOUNTER("nx_largepages_splits"),
> +       STATS_DESC_ICOUNTER("max_mmu_page_hash_collisions"));
> +
> +struct _kvm_stats_header kvm_vm_stats_header = {
> +       .name_size = KVM_STATS_NAME_LEN,
> +       .count = ARRAY_SIZE(kvm_vm_stats_desc),
> +       .desc_offset = sizeof(struct kvm_stats_header),
> +       .data_offset = sizeof(struct kvm_stats_header) +
> +               sizeof(kvm_vm_stats_desc),
> +};
> +
> +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
> +       STATS_DESC_COUNTER("pf_fixed"),
> +       STATS_DESC_COUNTER("pf_guest"),
> +       STATS_DESC_COUNTER("tlb_flush"),
> +       STATS_DESC_COUNTER("invlpg"),
> +       STATS_DESC_COUNTER("exits"),
> +       STATS_DESC_COUNTER("io_exits"),
> +       STATS_DESC_COUNTER("mmio_exits"),
> +       STATS_DESC_COUNTER("signal_exits"),
> +       STATS_DESC_COUNTER("irq_window_exits"),
> +       STATS_DESC_COUNTER("nmi_window_exits"),
> +       STATS_DESC_COUNTER("l1d_flush"),
> +       STATS_DESC_COUNTER("halt_exits"),
> +       STATS_DESC_COUNTER("request_irq_exits"),
> +       STATS_DESC_COUNTER("irq_exits"),
> +       STATS_DESC_COUNTER("host_state_reload"),
> +       STATS_DESC_COUNTER("fpu_reload"),
> +       STATS_DESC_COUNTER("insn_emulation"),
> +       STATS_DESC_COUNTER("insn_emulation_fail"),
> +       STATS_DESC_COUNTER("hypercalls"),
> +       STATS_DESC_COUNTER("irq_injections"),
> +       STATS_DESC_COUNTER("nmi_injections"),
> +       STATS_DESC_COUNTER("req_event"),
> +       STATS_DESC_COUNTER("nested_run"));
> +
> +struct _kvm_stats_header kvm_vcpu_stats_header = {
> +       .name_size = KVM_STATS_NAME_LEN,
> +       .count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> +       .desc_offset = sizeof(struct kvm_stats_header),
> +       .data_offset = sizeof(struct kvm_stats_header) +
> +               sizeof(kvm_vcpu_stats_desc),
> +};
> +
>  struct kvm_stats_debugfs_item debugfs_entries[] = {
>         VCPU_STAT("pf_fixed", pf_fixed),
>         VCPU_STAT("pf_guest", pf_guest),
> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> index 97700e41db3b..c0a8e6ddc745 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -1240,6 +1240,19 @@ struct kvm_stats_debugfs_item {
>         int mode;
>  };
>
> +struct _kvm_stats_header {
> +       __u32 name_size;
> +       __u32 count;
> +       __u32 desc_offset;
> +       __u32 data_offset;
> +};
> +
> +#define KVM_STATS_NAME_LEN     48
> +struct _kvm_stats_desc {
> +       struct kvm_stats_desc desc;
> +       char name[KVM_STATS_NAME_LEN];
> +};
> +
>  #define KVM_DBGFS_GET_MODE(dbgfs_item)                                         \
>         ((dbgfs_item)->mode ? (dbgfs_item)->mode : 0644)
>
> @@ -1253,8 +1266,127 @@ struct kvm_stats_debugfs_item {
>         { n, offsetof(struct kvm_vcpu, stat.common.x),                         \
>           KVM_STAT_VCPU, ## __VA_ARGS__ }
>
> +#define STATS_DESC(stat, type, unit, scale, exp)                              \
> +       {                                                                      \
> +               {                                                              \

.desc = {

> +                       .flags = type | unit | scale,                          \
> +                       .exponent = exp,                                       \
> +                       .size = 1                                              \
> +               },                                                             \
> +               .name = stat,                                                  \
> +       }
> +#define STATS_DESC_CUMULATIVE(name, unit, scale, exponent)                    \
> +       STATS_DESC(name, KVM_STATS_TYPE_CUMULATIVE, unit, scale, exponent)
> +#define STATS_DESC_INSTANT(name, unit, scale, exponent)                               \
> +       STATS_DESC(name, KVM_STATS_TYPE_INSTANT, unit, scale, exponent)
> +
> +/* Cumulative counter */
> +#define STATS_DESC_COUNTER(name)                                              \
> +       STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_NONE,                       \
> +               KVM_STATS_BASE_POW10, 0)
> +/* Instantaneous counter */
> +#define STATS_DESC_ICOUNTER(name)                                             \
> +       STATS_DESC_INSTANT(name, KVM_STATS_UNIT_NONE,                          \
> +               KVM_STATS_BASE_POW10, 0)
> +
> +/* Cumulative clock cycles */
> +#define STATS_DESC_CYCLE(name)                                                \
> +       STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_CYCLES,                     \
> +               KVM_STATS_BASE_POW10, 0)
> +/* Instantaneous clock cycles */
> +#define STATS_DESC_ICYCLE(name)                                                       \
> +       STATS_DESC_INSTANT(name, KVM_STATS_UNIT_CYCLES,                        \
> +               KVM_STATS_BASE_POW10, 0)
> +
> +/* Cumulative memory size in Byte */
> +#define STATS_DESC_SIZE_BYTE(name)                                            \
> +       STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES,                      \
> +               KVM_STATS_BASE_POW2, 0)
> +/* Cumulative memory size in KiByte */
> +#define STATS_DESC_SIZE_KBYTE(name)                                           \
> +       STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES,                      \
> +               KVM_STATS_BASE_POW2, 10)
> +/* Cumulative memory size in MiByte */
> +#define STATS_DESC_SIZE_MBYTE(name)                                           \
> +       STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES,                      \
> +               KVM_STATS_BASE_POW2, 20)
> +/* Cumulative memory size in GiByte */
> +#define STATS_DESC_SIZE_GBYTE(name)                                           \
> +       STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES,                      \
> +               KVM_STATS_BASE_POW2, 30)
> +
> +/* Instantaneous memory size in Byte */
> +#define STATS_DESC_ISIZE_BYTE(name)                                           \
> +       STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES,                         \
> +               KVM_STATS_BASE_POW2, 0)
> +/* Instantaneous memory size in KiByte */
> +#define STATS_DESC_ISIZE_KBYTE(name)                                          \
> +       STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES,                         \
> +               KVM_STATS_BASE_POW2, 10)
> +/* Instantaneous memory size in MiByte */
> +#define STATS_DESC_ISIZE_MBYTE(name)                                          \
> +       STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES,                         \
> +               KVM_STATS_BASE_POW2, 20)
> +/* Instantaneous memory size in GiByte */
> +#define STATS_DESC_ISIZE_GBYTE(name)                                          \
> +       STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES,                         \
> +               KVM_STATS_BASE_POW2, 30)
> +
> +/* Cumulative time in second */
> +#define STATS_DESC_TIME_SEC(name)                                             \
> +       STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS,                    \
> +               KVM_STATS_BASE_POW10, 0)
> +/* Cumulative time in millisecond */
> +#define STATS_DESC_TIME_MSEC(name)                                            \
> +       STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS,                    \
> +               KVM_STATS_BASE_POW10, -3)
> +/* Cumulative time in microsecond */
> +#define STATS_DESC_TIME_USEC(name)                                            \
> +       STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS,                    \
> +               KVM_STATS_BASE_POW10, -6)
> +/* Cumulative time in nanosecond */
> +#define STATS_DESC_TIME_NSEC(name)                                            \
> +       STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS,                    \
> +               KVM_STATS_BASE_POW10, -9)
> +
> +/* Instantaneous time in second */
> +#define STATS_DESC_ITIME_SEC(name)                                            \
> +       STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS,                       \
> +               KVM_STATS_BASE_POW10, 0)
> +/* Instantaneous time in millisecond */
> +#define STATS_DESC_ITIME_MSEC(name)                                           \
> +       STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS,                       \
> +               KVM_STATS_BASE_POW10, -3)
> +/* Instantaneous time in microsecond */
> +#define STATS_DESC_ITIME_USEC(name)                                           \
> +       STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS,                       \
> +               KVM_STATS_BASE_POW10, -6)
> +/* Instantaneous time in nanosecond */
> +#define STATS_DESC_ITIME_NSEC(name)                                           \
> +       STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS,                       \
> +               KVM_STATS_BASE_POW10, -9)
> +
> +#define DEFINE_VM_STATS_DESC(...) {                                           \
> +       STATS_DESC_COUNTER("remote_tlb_flush"),                                \
> +       ## __VA_ARGS__                                                         \
> +}
> +
> +#define DEFINE_VCPU_STATS_DESC(...) {                                         \
> +       STATS_DESC_COUNTER("halt_successful_poll"),                            \
> +       STATS_DESC_COUNTER("halt_attempted_poll"),                             \
> +       STATS_DESC_COUNTER("halt_poll_invalid"),                               \
> +       STATS_DESC_COUNTER("halt_wakeup"),                                     \
> +       STATS_DESC_TIME_NSEC("halt_poll_success_ns"),                          \
> +       STATS_DESC_TIME_NSEC("halt_poll_fail_ns"),                             \
> +       ## __VA_ARGS__                                                         \
> +}
> +
>  extern struct kvm_stats_debugfs_item debugfs_entries[];
>  extern struct dentry *kvm_debugfs_dir;
> +extern struct _kvm_stats_header kvm_vm_stats_header;
> +extern struct _kvm_stats_header kvm_vcpu_stats_header;
> +extern struct _kvm_stats_desc kvm_vm_stats_desc[];
> +extern struct _kvm_stats_desc kvm_vcpu_stats_desc[];
>
>  #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
>  static inline int mmu_notifier_retry(struct kvm *kvm, unsigned long mmu_seq)
> diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
> index 3fd9a7e9d90c..82db825c392c 100644
> --- a/include/uapi/linux/kvm.h
> +++ b/include/uapi/linux/kvm.h
> @@ -1082,6 +1082,7 @@ struct kvm_ppc_resize_hpt {
>  #define KVM_CAP_SGX_ATTRIBUTE 196
>  #define KVM_CAP_VM_COPY_ENC_CONTEXT_FROM 197
>  #define KVM_CAP_PTP_KVM 198
> +#define KVM_CAP_STATS_BINARY_FD 199
>
>  #ifdef KVM_CAP_IRQ_ROUTING
>
> @@ -1898,4 +1899,53 @@ struct kvm_dirty_gfn {
>  #define KVM_BUS_LOCK_DETECTION_OFF             (1 << 0)
>  #define KVM_BUS_LOCK_DETECTION_EXIT            (1 << 1)
>
> +#define KVM_STATS_ID_MAXLEN            64
> +
> +struct kvm_stats_header {
> +       char id[KVM_STATS_ID_MAXLEN];
> +       __u32 name_size;
> +       __u32 count;
> +       __u32 desc_offset;
> +       __u32 data_offset;
> +};
> +
> +#define KVM_STATS_TYPE_SHIFT           0
> +#define KVM_STATS_TYPE_MASK            (0xF << KVM_STATS_TYPE_SHIFT)
> +#define KVM_STATS_TYPE_CUMULATIVE      (0x0 << KVM_STATS_TYPE_SHIFT)
> +#define KVM_STATS_TYPE_INSTANT         (0x1 << KVM_STATS_TYPE_SHIFT)
> +#define KVM_STATS_TYPE_MAX             KVM_STATS_TYPE_INSTANT
> +
> +#define KVM_STATS_UNIT_SHIFT           4
> +#define KVM_STATS_UNIT_MASK            (0xF << KVM_STATS_UNIT_SHIFT)
> +#define KVM_STATS_UNIT_NONE            (0x0 << KVM_STATS_UNIT_SHIFT)
> +#define KVM_STATS_UNIT_BYTES           (0x1 << KVM_STATS_UNIT_SHIFT)
> +#define KVM_STATS_UNIT_SECONDS         (0x2 << KVM_STATS_UNIT_SHIFT)
> +#define KVM_STATS_UNIT_CYCLES          (0x3 << KVM_STATS_UNIT_SHIFT)
> +#define KVM_STATS_UNIT_MAX             KVM_STATS_UNIT_CYCLES
> +
> +#define KVM_STATS_BASE_SHIFT           8
> +#define KVM_STATS_BASE_MASK            (0xF << KVM_STATS_BASE_SHIFT)
> +#define KVM_STATS_BASE_POW10           (0x0 << KVM_STATS_BASE_SHIFT)
> +#define KVM_STATS_BASE_POW2            (0x1 << KVM_STATS_BASE_SHIFT)
> +#define KVM_STATS_BASE_MAX             KVM_STATS_BASE_POW2
> +
> +struct kvm_stats_desc {
> +       __u32 flags;
> +       __s16 exponent;
> +       __u16 size;
> +       __u32 unused1;
> +       __u32 unused2;
> +       char name[0];
> +};
> +
> +struct kvm_vm_stats_data {
> +       unsigned long value[0];
> +};
> +
> +struct kvm_vcpu_stats_data {
> +       __u64 value[0];
> +};
> +
> +#define KVM_STATS_GETFD  _IOR(KVMIO,  0xcc, struct kvm_stats_header)
> +
>  #endif /* __LINUX_KVM_H */
> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> index 34a4cf265297..9e20e2ff78b4 100644
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -3409,6 +3409,120 @@ static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
>         return 0;
>  }
>
> +static ssize_t kvm_stats_read(char *id, struct _kvm_stats_header *header,
> +               struct _kvm_stats_desc *desc, void *stats, size_t size_stats,
> +               char __user *user_buffer, size_t size, loff_t *offset)
> +{
> +       ssize_t copylen, len, remain = size;
> +       size_t size_header, size_desc;
> +       loff_t pos = *offset;
> +       char __user *dest = user_buffer;
> +       void *src;
> +
> +       size_header = sizeof(*header);
> +       size_desc = header->count * sizeof(*desc);
> +
> +       len = KVM_STATS_ID_MAXLEN + size_header + size_desc + size_stats - pos;
> +       len = min(len, remain);
> +       if (len <= 0)
> +               return 0;
> +       remain = len;
> +
> +       /* Copy kvm stats header id string */
> +       copylen = KVM_STATS_ID_MAXLEN - pos;
> +       copylen = min(copylen, remain);
> +       if (copylen > 0) {
> +               src = id + pos;
> +               if (copy_to_user(dest, src, copylen))
> +                       return -EFAULT;
> +               remain -= copylen;
> +               pos += copylen;
> +               dest += copylen;
> +       }
> +       /* Copy kvm stats header */
> +       copylen = KVM_STATS_ID_MAXLEN + size_header - pos;
> +       copylen = min(copylen, remain);
> +       if (copylen > 0) {
> +               src = header + pos - KVM_STATS_ID_MAXLEN;
> +               if (copy_to_user(dest, src, copylen))
> +                       return -EFAULT;
> +               remain -= copylen;
> +               pos += copylen;
> +               dest += copylen;
> +       }
> +       /* Copy kvm stats descriptors */
> +       copylen = header->desc_offset + size_desc - pos;
> +       copylen = min(copylen, remain);
> +       if (copylen > 0) {
> +               src = desc + pos - header->desc_offset;
> +               if (copy_to_user(dest, src, copylen))
> +                       return -EFAULT;
> +               remain -= copylen;
> +               pos += copylen;
> +               dest += copylen;
> +       }
> +       /* Copy kvm stats values */
> +       copylen = header->data_offset + size_stats - pos;
> +       copylen = min(copylen, remain);
> +       if (copylen > 0) {
> +               src = stats + pos - header->data_offset;
> +               if (copy_to_user(dest, src, copylen))
> +                       return -EFAULT;
> +               remain -= copylen;
> +               pos += copylen;
> +               dest += copylen;
> +       }
> +
> +       *offset = pos;
> +       return len;
> +}
> +
> +static ssize_t kvm_vcpu_stats_read(struct file *file, char __user *user_buffer,
> +                             size_t size, loff_t *offset)
> +{
> +       char id[KVM_STATS_ID_MAXLEN];
> +       struct kvm_vcpu *vcpu = file->private_data;
> +
> +       snprintf(id, sizeof(id), "kvm-%d/vcpu-%d",
> +                       task_pid_nr(current), vcpu->vcpu_id);
> +       return kvm_stats_read(id, &kvm_vcpu_stats_header,
> +                       &kvm_vcpu_stats_desc[0], &vcpu->stat,
> +                       sizeof(vcpu->stat), user_buffer, size, offset);
> +}
> +
> +static const struct file_operations kvm_vcpu_stats_fops = {
> +       .read = kvm_vcpu_stats_read,
> +       .llseek = noop_llseek,
> +};
> +
> +static int kvm_vcpu_ioctl_get_statsfd(struct kvm_vcpu *vcpu)
> +{
> +       int error, fd;
> +       struct file *file;
> +       char name[15 + ITOA_MAX_LEN + 1];
> +
> +       snprintf(name, sizeof(name), "kvm-vcpu-stats:%d", vcpu->vcpu_id);
> +
> +       error = get_unused_fd_flags(O_CLOEXEC);
> +       if (error < 0)
> +               return error;
> +       fd = error;
> +
> +       file = anon_inode_getfile(name, &kvm_vcpu_stats_fops, vcpu, O_RDONLY);
> +       if (IS_ERR(file)) {
> +               error = PTR_ERR(file);
> +               goto err_put_unused_fd;
> +       }
> +       file->f_mode |= FMODE_PREAD;
> +       fd_install(fd, file);
> +
> +       return fd;
> +
> +err_put_unused_fd:
> +       put_unused_fd(fd);
> +       return error;
> +}
> +
>  static long kvm_vcpu_ioctl(struct file *filp,
>                            unsigned int ioctl, unsigned long arg)
>  {
> @@ -3606,6 +3720,10 @@ static long kvm_vcpu_ioctl(struct file *filp,
>                 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
>                 break;
>         }
> +       case KVM_STATS_GETFD: {
> +               r = kvm_vcpu_ioctl_get_statsfd(vcpu);
> +               break;
> +       }
>         default:
>                 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
>         }
> @@ -3864,6 +3982,8 @@ static long kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg)
>  #else
>                 return 0;
>  #endif
> +       case KVM_CAP_STATS_BINARY_FD:
> +               return 1;
>         default:
>                 break;
>         }
> @@ -3967,6 +4087,48 @@ static int kvm_vm_ioctl_enable_cap_generic(struct kvm *kvm,
>         }
>  }
>
> +static ssize_t kvm_vm_stats_read(struct file *file, char __user *user_buffer,
> +                             size_t size, loff_t *offset)
> +{
> +       char id[KVM_STATS_ID_MAXLEN];
> +       struct kvm *kvm = file->private_data;
> +
> +       snprintf(id, sizeof(id), "kvm-%d", task_pid_nr(current));
> +       return kvm_stats_read(id, &kvm_vm_stats_header, &kvm_vm_stats_desc[0],
> +               &kvm->stat, sizeof(kvm->stat), user_buffer, size, offset);
> +}
> +
> +static const struct file_operations kvm_vm_stats_fops = {
> +       .read = kvm_vm_stats_read,
> +       .llseek = noop_llseek,
> +};
> +
> +static int kvm_vm_ioctl_get_statsfd(struct kvm *kvm)
> +{
> +       int error, fd;
> +       struct file *file;
> +
> +       error = get_unused_fd_flags(O_CLOEXEC);
> +       if (error < 0)
> +               return error;
> +       fd = error;
> +
> +       file = anon_inode_getfile("kvm-vm-stats",
> +                       &kvm_vm_stats_fops, kvm, O_RDONLY);
> +       if (IS_ERR(file)) {
> +               error = PTR_ERR(file);
> +               goto err_put_unused_fd;
> +       }
> +       file->f_mode |= FMODE_PREAD;
> +       fd_install(fd, file);
> +
> +       return fd;
> +
> +err_put_unused_fd:
> +       put_unused_fd(fd);
> +       return error;
> +}
> +
>  static long kvm_vm_ioctl(struct file *filp,
>                            unsigned int ioctl, unsigned long arg)
>  {
> @@ -4149,6 +4311,9 @@ static long kvm_vm_ioctl(struct file *filp,
>         case KVM_RESET_DIRTY_RINGS:
>                 r = kvm_vm_ioctl_reset_dirty_pages(kvm);
>                 break;
> +       case KVM_STATS_GETFD:
> +               r = kvm_vm_ioctl_get_statsfd(kvm);
> +               break;
>         default:
>                 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
>         }
> --
> 2.31.1.818.g46aad6cb9e-goog
>

Re: [PATCH v6 2/4] KVM: stats: Add fd-based API to read binary stats data

[David Matlack]

On Mon, May 24, 2021 at 8:18 AM Jing Zhang <jingzhangos@google.com> wrote:
>
> Provides a file descriptor per VM to read VM stats info/data.
> Provides a file descriptor per vCPU to read vCPU stats info/data.
>
> Reviewed-by: David Matlack <dmatlack@google.com>
> Reviewed-by: Ricardo Koller <ricarkol@google.com>
> Signed-off-by: Jing Zhang <jingzhangos@google.com>

Looks good. Just some optional nits to consider if you do a v7.

Reviewed-by: David Matlack <dmatlack@google.com>

> ---
>  arch/arm64/kvm/guest.c    |  26 ++++++
>  arch/mips/kvm/mips.c      |  52 ++++++++++++
>  arch/powerpc/kvm/book3s.c |  52 ++++++++++++
>  arch/powerpc/kvm/booke.c  |  45 +++++++++++
>  arch/s390/kvm/kvm-s390.c  | 117 +++++++++++++++++++++++++++
>  arch/x86/kvm/x86.c        |  53 ++++++++++++
>  include/linux/kvm_host.h  | 132 ++++++++++++++++++++++++++++++
>  include/uapi/linux/kvm.h  |  50 ++++++++++++
>  virt/kvm/kvm_main.c       | 165 ++++++++++++++++++++++++++++++++++++++
>  9 files changed, 692 insertions(+)
>
> diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
> index 0e41331b0911..1cc1d83630ac 100644
> --- a/arch/arm64/kvm/guest.c
> +++ b/arch/arm64/kvm/guest.c
> @@ -28,6 +28,32 @@
>
>  #include "trace.h"
>
> +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC();
> +
> +struct _kvm_stats_header kvm_vm_stats_header = {
> +       .name_size = KVM_STATS_NAME_LEN,
> +       .count = ARRAY_SIZE(kvm_vm_stats_desc),
> +       .desc_offset = sizeof(struct kvm_stats_header),
> +       .data_offset = sizeof(struct kvm_stats_header) +
> +               sizeof(kvm_vm_stats_desc),
> +};

nit: Defining the same _kvm_stats_header struct for each arch seems a
bit superfluous? Alternatively you could define them once in
kvm_main.c, or omit them entirely and generate the kvm_stats_header on
the fly when reading the file.


> +
> +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
> +       STATS_DESC_COUNTER("hvc_exit_stat"),
> +       STATS_DESC_COUNTER("wfe_exit_stat"),
> +       STATS_DESC_COUNTER("wfi_exit_stat"),
> +       STATS_DESC_COUNTER("mmio_exit_user"),
> +       STATS_DESC_COUNTER("mmio_exit_kernel"),
> +       STATS_DESC_COUNTER("exits"));
> +
> +struct _kvm_stats_header kvm_vcpu_stats_header = {
> +       .name_size = KVM_STATS_NAME_LEN,
> +       .count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> +       .desc_offset = sizeof(struct kvm_stats_header),
> +       .data_offset = sizeof(struct kvm_stats_header) +
> +               sizeof(kvm_vcpu_stats_desc),
> +};
> +
>  struct kvm_stats_debugfs_item debugfs_entries[] = {
>         VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
>         VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
> index f4fc60c05e9c..f17a65743ccd 100644
> --- a/arch/mips/kvm/mips.c
> +++ b/arch/mips/kvm/mips.c
> @@ -38,6 +38,58 @@
>  #define VECTORSPACING 0x100    /* for EI/VI mode */
>  #endif
>
> +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC();
> +
> +struct _kvm_stats_header kvm_vm_stats_header = {
> +       .name_size = KVM_STATS_NAME_LEN,
> +       .count = ARRAY_SIZE(kvm_vm_stats_desc),
> +       .desc_offset = sizeof(struct kvm_stats_header),
> +       .data_offset = sizeof(struct kvm_stats_header) +
> +               sizeof(kvm_vm_stats_desc),
> +};
> +
> +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
> +       STATS_DESC_COUNTER("wait_exits"),
> +       STATS_DESC_COUNTER("cache_exits"),
> +       STATS_DESC_COUNTER("signal_exits"),
> +       STATS_DESC_COUNTER("int_exits"),
> +       STATS_DESC_COUNTER("cop_unusable_exits"),
> +       STATS_DESC_COUNTER("tlbmod_exits"),
> +       STATS_DESC_COUNTER("tlbmiss_ld_exits"),
> +       STATS_DESC_COUNTER("tlbmiss_st_exits"),
> +       STATS_DESC_COUNTER("addrerr_st_exits"),
> +       STATS_DESC_COUNTER("addrerr_ld_exits"),
> +       STATS_DESC_COUNTER("syscall_exits"),
> +       STATS_DESC_COUNTER("resvd_inst_exits"),
> +       STATS_DESC_COUNTER("break_inst_exits"),
> +       STATS_DESC_COUNTER("trap_inst_exits"),
> +       STATS_DESC_COUNTER("msa_fpe_exits"),
> +       STATS_DESC_COUNTER("fpe_exits"),
> +       STATS_DESC_COUNTER("msa_disabled_exits"),
> +       STATS_DESC_COUNTER("flush_dcache_exits"),
> +#ifdef CONFIG_KVM_MIPS_VZ
> +       STATS_DESC_COUNTER("vz_gpsi_exits"),
> +       STATS_DESC_COUNTER("vz_gsfc_exits"),
> +       STATS_DESC_COUNTER("vz_hc_exits"),
> +       STATS_DESC_COUNTER("vz_grr_exits"),
> +       STATS_DESC_COUNTER("vz_gva_exits"),
> +       STATS_DESC_COUNTER("vz_ghfc_exits"),
> +       STATS_DESC_COUNTER("vz_gpa_exits"),
> +       STATS_DESC_COUNTER("vz_resvd_exits"),
> +#ifdef CONFIG_CPU_LOONGSON64
> +       STATS_DESC_COUNTER("vz_cpucfg_exits"),
> +#endif
> +#endif
> +       );
> +
> +struct _kvm_stats_header kvm_vcpu_stats_header = {
> +       .name_size = KVM_STATS_NAME_LEN,
> +       .count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> +       .desc_offset = sizeof(struct kvm_stats_header),
> +       .data_offset = sizeof(struct kvm_stats_header) +
> +               sizeof(kvm_vcpu_stats_desc),
> +};
> +
>  struct kvm_stats_debugfs_item debugfs_entries[] = {
>         VCPU_STAT("wait", wait_exits),
>         VCPU_STAT("cache", cache_exits),
> diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
> index bd3a10e1fdaf..5e8ee0d39ef9 100644
> --- a/arch/powerpc/kvm/book3s.c
> +++ b/arch/powerpc/kvm/book3s.c
> @@ -38,6 +38,58 @@
>
>  /* #define EXIT_DEBUG */
>
> +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(
> +       STATS_DESC_ICOUNTER("num_2M_pages"),
> +       STATS_DESC_ICOUNTER("num_1G_pages"));
> +
> +struct _kvm_stats_header kvm_vm_stats_header = {
> +       .name_size = KVM_STATS_NAME_LEN,
> +       .count = ARRAY_SIZE(kvm_vm_stats_desc),
> +       .desc_offset = sizeof(struct kvm_stats_header),
> +       .data_offset = sizeof(struct kvm_stats_header) +
> +               sizeof(kvm_vm_stats_desc),
> +};
> +
> +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
> +       STATS_DESC_COUNTER("sum_exits"),
> +       STATS_DESC_COUNTER("mmio_exits"),
> +       STATS_DESC_COUNTER("signal_exits"),
> +       STATS_DESC_COUNTER("light_exits"),
> +       STATS_DESC_COUNTER("itlb_real_miss_exits"),
> +       STATS_DESC_COUNTER("itlb_virt_miss_exits"),
> +       STATS_DESC_COUNTER("dtlb_real_miss_exits"),
> +       STATS_DESC_COUNTER("dtlb_virt_miss_exits"),
> +       STATS_DESC_COUNTER("syscall_exits"),
> +       STATS_DESC_COUNTER("isi_exits"),
> +       STATS_DESC_COUNTER("dsi_exits"),
> +       STATS_DESC_COUNTER("emulated_inst_exits"),
> +       STATS_DESC_COUNTER("dec_exits"),
> +       STATS_DESC_COUNTER("ext_intr_exits"),
> +       STATS_DESC_TIME_NSEC("halt_wait_ns"),
> +       STATS_DESC_COUNTER("halt_successful_wait"),
> +       STATS_DESC_COUNTER("dbell_exits"),
> +       STATS_DESC_COUNTER("gdbell_exits"),
> +       STATS_DESC_COUNTER("ld"),
> +       STATS_DESC_COUNTER("st"),
> +       STATS_DESC_COUNTER("pf_storage"),
> +       STATS_DESC_COUNTER("pf_instruc"),
> +       STATS_DESC_COUNTER("sp_storage"),
> +       STATS_DESC_COUNTER("sp_instruc"),
> +       STATS_DESC_COUNTER("queue_intr"),
> +       STATS_DESC_COUNTER("ld_slow"),
> +       STATS_DESC_COUNTER("st_slow"),
> +       STATS_DESC_COUNTER("pthru_all"),
> +       STATS_DESC_COUNTER("pthru_host"),
> +       STATS_DESC_COUNTER("pthru_bad_aff"));
> +
> +struct _kvm_stats_header kvm_vcpu_stats_header = {
> +       .name_size = KVM_STATS_NAME_LEN,
> +       .count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> +       .desc_offset = sizeof(struct kvm_stats_header),
> +       .data_offset = sizeof(struct kvm_stats_header) +
> +               sizeof(kvm_vcpu_stats_desc),
> +};
> +
>  struct kvm_stats_debugfs_item debugfs_entries[] = {
>         VCPU_STAT("exits", sum_exits),
>         VCPU_STAT("mmio", mmio_exits),
> diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
> index 07fdd7a1254a..86d221e9193e 100644
> --- a/arch/powerpc/kvm/booke.c
> +++ b/arch/powerpc/kvm/booke.c
> @@ -36,6 +36,51 @@
>
>  unsigned long kvmppc_booke_handlers;
>
> +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(
> +       STATS_DESC_ICOUNTER("num_2M_pages"),
> +       STATS_DESC_ICOUNTER("num_1G_pages"));
> +
> +struct _kvm_stats_header kvm_vm_stats_header = {
> +       .name_size = KVM_STATS_NAME_LEN,
> +       .count = ARRAY_SIZE(kvm_vm_stats_desc),
> +       .desc_offset = sizeof(struct kvm_stats_header),
> +       .data_offset = sizeof(struct kvm_stats_header) +
> +               sizeof(kvm_vm_stats_desc),
> +};
> +
> +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
> +       STATS_DESC_COUNTER("sum_exits"),
> +       STATS_DESC_COUNTER("mmio_exits"),
> +       STATS_DESC_COUNTER("signal_exits"),
> +       STATS_DESC_COUNTER("light_exits"),
> +       STATS_DESC_COUNTER("itlb_real_miss_exits"),
> +       STATS_DESC_COUNTER("itlb_virt_miss_exits"),
> +       STATS_DESC_COUNTER("dtlb_real_miss_exits"),
> +       STATS_DESC_COUNTER("dtlb_virt_miss_exits"),
> +       STATS_DESC_COUNTER("syscall_exits"),
> +       STATS_DESC_COUNTER("isi_exits"),
> +       STATS_DESC_COUNTER("dsi_exits"),
> +       STATS_DESC_COUNTER("emulated_inst_exits"),
> +       STATS_DESC_COUNTER("dec_exits"),
> +       STATS_DESC_COUNTER("ext_intr_exits"),
> +       STATS_DESC_TIME_NSEC("halt_wait_ns"),
> +       STATS_DESC_COUNTER("halt_successful_wait"),
> +       STATS_DESC_COUNTER("dbell_exits"),
> +       STATS_DESC_COUNTER("gdbell_exits"),
> +       STATS_DESC_COUNTER("ld"),
> +       STATS_DESC_COUNTER("st"),
> +       STATS_DESC_COUNTER("pthru_all"),
> +       STATS_DESC_COUNTER("pthru_host"),
> +       STATS_DESC_COUNTER("pthru_bad_aff"));
> +
> +struct _kvm_stats_header kvm_vcpu_stats_header = {
> +       .name_size = KVM_STATS_NAME_LEN,
> +       .count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> +       .desc_offset = sizeof(struct kvm_stats_header),
> +       .data_offset = sizeof(struct kvm_stats_header) +
> +               sizeof(kvm_vcpu_stats_desc),
> +};
> +
>  struct kvm_stats_debugfs_item debugfs_entries[] = {
>         VCPU_STAT("mmio", mmio_exits),
>         VCPU_STAT("sig", signal_exits),
> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> index d6bf3372bb10..003feee79fce 100644
> --- a/arch/s390/kvm/kvm-s390.c
> +++ b/arch/s390/kvm/kvm-s390.c
> @@ -58,6 +58,123 @@
>  #define VCPU_IRQS_MAX_BUF (sizeof(struct kvm_s390_irq) * \
>                            (KVM_MAX_VCPUS + LOCAL_IRQS))
>
> +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(
> +       STATS_DESC_COUNTER("inject_io"),
> +       STATS_DESC_COUNTER("inject_float_mchk"),
> +       STATS_DESC_COUNTER("inject_pfault_done"),
> +       STATS_DESC_COUNTER("inject_service_signal"),
> +       STATS_DESC_COUNTER("inject_virtio"));
> +
> +struct _kvm_stats_header kvm_vm_stats_header = {
> +       .name_size = KVM_STATS_NAME_LEN,
> +       .count = ARRAY_SIZE(kvm_vm_stats_desc),
> +       .desc_offset = sizeof(struct kvm_stats_header),
> +       .data_offset = sizeof(struct kvm_stats_header) +
> +               sizeof(kvm_vm_stats_desc),
> +};
> +
> +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
> +       STATS_DESC_COUNTER("exit_userspace"),
> +       STATS_DESC_COUNTER("exit_null"),
> +       STATS_DESC_COUNTER("exit_external_request"),
> +       STATS_DESC_COUNTER("exit_io_request"),
> +       STATS_DESC_COUNTER("exit_external_interrupt"),
> +       STATS_DESC_COUNTER("exit_stop_request"),
> +       STATS_DESC_COUNTER("exit_validity"),
> +       STATS_DESC_COUNTER("exit_instruction"),
> +       STATS_DESC_COUNTER("exit_pei"),
> +       STATS_DESC_COUNTER("halt_no_poll_steal"),
> +       STATS_DESC_COUNTER("instruction_lctl"),
> +       STATS_DESC_COUNTER("instruction_lctlg"),
> +       STATS_DESC_COUNTER("instruction_stctl"),
> +       STATS_DESC_COUNTER("instruction_stctg"),
> +       STATS_DESC_COUNTER("exit_program_interruption"),
> +       STATS_DESC_COUNTER("exit_instr_and_program"),
> +       STATS_DESC_COUNTER("exit_operation_exception"),
> +       STATS_DESC_COUNTER("deliver_ckc"),
> +       STATS_DESC_COUNTER("deliver_cputm"),
> +       STATS_DESC_COUNTER("deliver_external_call"),
> +       STATS_DESC_COUNTER("deliver_emergency_signal"),
> +       STATS_DESC_COUNTER("deliver_service_signal"),
> +       STATS_DESC_COUNTER("deliver_virtio"),
> +       STATS_DESC_COUNTER("deliver_stop_signal"),
> +       STATS_DESC_COUNTER("deliver_prefix_signal"),
> +       STATS_DESC_COUNTER("deliver_restart_signal"),
> +       STATS_DESC_COUNTER("deliver_program"),
> +       STATS_DESC_COUNTER("deliver_io"),
> +       STATS_DESC_COUNTER("deliver_machine_check"),
> +       STATS_DESC_COUNTER("exit_wait_state"),
> +       STATS_DESC_COUNTER("inject_ckc"),
> +       STATS_DESC_COUNTER("inject_cputm"),
> +       STATS_DESC_COUNTER("inject_external_call"),
> +       STATS_DESC_COUNTER("inject_emergency_signal"),
> +       STATS_DESC_COUNTER("inject_mchk"),
> +       STATS_DESC_COUNTER("inject_pfault_init"),
> +       STATS_DESC_COUNTER("inject_program"),
> +       STATS_DESC_COUNTER("inject_restart"),
> +       STATS_DESC_COUNTER("inject_set_prefix"),
> +       STATS_DESC_COUNTER("inject_stop_signal"),
> +       STATS_DESC_COUNTER("instruction_epsw"),
> +       STATS_DESC_COUNTER("instruction_gs"),
> +       STATS_DESC_COUNTER("instruction_io_other"),
> +       STATS_DESC_COUNTER("instruction_lpsw"),
> +       STATS_DESC_COUNTER("instruction_lpswe"),
> +       STATS_DESC_COUNTER("instruction_pfmf"),
> +       STATS_DESC_COUNTER("instruction_ptff"),
> +       STATS_DESC_COUNTER("instruction_sck"),
> +       STATS_DESC_COUNTER("instruction_sckpf"),
> +       STATS_DESC_COUNTER("instruction_stidp"),
> +       STATS_DESC_COUNTER("instruction_spx"),
> +       STATS_DESC_COUNTER("instruction_stpx"),
> +       STATS_DESC_COUNTER("instruction_stap"),
> +       STATS_DESC_COUNTER("instruction_iske"),
> +       STATS_DESC_COUNTER("instruction_ri"),
> +       STATS_DESC_COUNTER("instruction_rrbe"),
> +       STATS_DESC_COUNTER("instruction_sske"),
> +       STATS_DESC_COUNTER("instruction_ipte_interlock"),
> +       STATS_DESC_COUNTER("instruction_stsi"),
> +       STATS_DESC_COUNTER("instruction_stfl"),
> +       STATS_DESC_COUNTER("instruction_tb"),
> +       STATS_DESC_COUNTER("instruction_tpi"),
> +       STATS_DESC_COUNTER("instruction_tprot"),
> +       STATS_DESC_COUNTER("instruction_tsch"),
> +       STATS_DESC_COUNTER("instruction_sie"),
> +       STATS_DESC_COUNTER("instruction_essa"),
> +       STATS_DESC_COUNTER("instruction_sthyi"),
> +       STATS_DESC_COUNTER("instruction_sigp_sense"),
> +       STATS_DESC_COUNTER("instruction_sigp_sense_running"),
> +       STATS_DESC_COUNTER("instruction_sigp_external_call"),
> +       STATS_DESC_COUNTER("instruction_sigp_emergency"),
> +       STATS_DESC_COUNTER("instruction_sigp_cond_emergency"),
> +       STATS_DESC_COUNTER("instruction_sigp_start"),
> +       STATS_DESC_COUNTER("instruction_sigp_stop"),
> +       STATS_DESC_COUNTER("instruction_sigp_stop_store_status"),
> +       STATS_DESC_COUNTER("instruction_sigp_store_status"),
> +       STATS_DESC_COUNTER("instruction_sigp_store_adtl_status"),
> +       STATS_DESC_COUNTER("instruction_sigp_arch"),
> +       STATS_DESC_COUNTER("instruction_sigp_prefix"),
> +       STATS_DESC_COUNTER("instruction_sigp_restart"),
> +       STATS_DESC_COUNTER("instruction_sigp_init_cpu_reset"),
> +       STATS_DESC_COUNTER("instruction_sigp_cpu_reset"),
> +       STATS_DESC_COUNTER("instruction_sigp_unknown"),
> +       STATS_DESC_COUNTER("diagnose_10"),
> +       STATS_DESC_COUNTER("diagnose_44"),
> +       STATS_DESC_COUNTER("diagnose_9c"),
> +       STATS_DESC_COUNTER("diagnose_9c_ignored"),
> +       STATS_DESC_COUNTER("diagnose_258"),
> +       STATS_DESC_COUNTER("diagnose_308"),
> +       STATS_DESC_COUNTER("diagnose_500"),
> +       STATS_DESC_COUNTER("diagnose_other"),
> +       STATS_DESC_COUNTER("pfault_sync"));
> +
> +struct _kvm_stats_header kvm_vcpu_stats_header = {
> +       .name_size = KVM_STATS_NAME_LEN,
> +       .count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> +       .desc_offset = sizeof(struct kvm_stats_header),
> +       .data_offset = sizeof(struct kvm_stats_header) +
> +               sizeof(kvm_vcpu_stats_desc),
> +};
> +
>  struct kvm_stats_debugfs_item debugfs_entries[] = {
>         VCPU_STAT("userspace_handled", exit_userspace),
>         VCPU_STAT("exit_null", exit_null),
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index 9a93d80caff6..84880687c199 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -214,6 +214,59 @@ EXPORT_SYMBOL_GPL(host_xss);
>  u64 __read_mostly supported_xss;
>  EXPORT_SYMBOL_GPL(supported_xss);
>
> +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(
> +       STATS_DESC_COUNTER("mmu_shadow_zapped"),
> +       STATS_DESC_COUNTER("mmu_pte_write"),
> +       STATS_DESC_COUNTER("mmu_pde_zapped"),
> +       STATS_DESC_COUNTER("mmu_flooded"),
> +       STATS_DESC_COUNTER("mmu_recycled"),
> +       STATS_DESC_COUNTER("mmu_cache_miss"),
> +       STATS_DESC_ICOUNTER("mmu_unsync"),
> +       STATS_DESC_ICOUNTER("largepages"),
> +       STATS_DESC_ICOUNTER("nx_largepages_splits"),
> +       STATS_DESC_ICOUNTER("max_mmu_page_hash_collisions"));
> +
> +struct _kvm_stats_header kvm_vm_stats_header = {
> +       .name_size = KVM_STATS_NAME_LEN,
> +       .count = ARRAY_SIZE(kvm_vm_stats_desc),
> +       .desc_offset = sizeof(struct kvm_stats_header),
> +       .data_offset = sizeof(struct kvm_stats_header) +
> +               sizeof(kvm_vm_stats_desc),
> +};
> +
> +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
> +       STATS_DESC_COUNTER("pf_fixed"),
> +       STATS_DESC_COUNTER("pf_guest"),
> +       STATS_DESC_COUNTER("tlb_flush"),
> +       STATS_DESC_COUNTER("invlpg"),
> +       STATS_DESC_COUNTER("exits"),
> +       STATS_DESC_COUNTER("io_exits"),
> +       STATS_DESC_COUNTER("mmio_exits"),
> +       STATS_DESC_COUNTER("signal_exits"),
> +       STATS_DESC_COUNTER("irq_window_exits"),
> +       STATS_DESC_COUNTER("nmi_window_exits"),
> +       STATS_DESC_COUNTER("l1d_flush"),
> +       STATS_DESC_COUNTER("halt_exits"),
> +       STATS_DESC_COUNTER("request_irq_exits"),
> +       STATS_DESC_COUNTER("irq_exits"),
> +       STATS_DESC_COUNTER("host_state_reload"),
> +       STATS_DESC_COUNTER("fpu_reload"),
> +       STATS_DESC_COUNTER("insn_emulation"),
> +       STATS_DESC_COUNTER("insn_emulation_fail"),
> +       STATS_DESC_COUNTER("hypercalls"),
> +       STATS_DESC_COUNTER("irq_injections"),
> +       STATS_DESC_COUNTER("nmi_injections"),
> +       STATS_DESC_COUNTER("req_event"),
> +       STATS_DESC_COUNTER("nested_run"));
> +
> +struct _kvm_stats_header kvm_vcpu_stats_header = {
> +       .name_size = KVM_STATS_NAME_LEN,
> +       .count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> +       .desc_offset = sizeof(struct kvm_stats_header),
> +       .data_offset = sizeof(struct kvm_stats_header) +
> +               sizeof(kvm_vcpu_stats_desc),
> +};
> +
>  struct kvm_stats_debugfs_item debugfs_entries[] = {
>         VCPU_STAT("pf_fixed", pf_fixed),
>         VCPU_STAT("pf_guest", pf_guest),
> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> index 97700e41db3b..c0a8e6ddc745 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -1240,6 +1240,19 @@ struct kvm_stats_debugfs_item {
>         int mode;
>  };
>
> +struct _kvm_stats_header {
> +       __u32 name_size;
> +       __u32 count;
> +       __u32 desc_offset;
> +       __u32 data_offset;
> +};
> +
> +#define KVM_STATS_NAME_LEN     48
> +struct _kvm_stats_desc {
> +       struct kvm_stats_desc desc;
> +       char name[KVM_STATS_NAME_LEN];
> +};
> +
>  #define KVM_DBGFS_GET_MODE(dbgfs_item)                                         \
>         ((dbgfs_item)->mode ? (dbgfs_item)->mode : 0644)
>
> @@ -1253,8 +1266,127 @@ struct kvm_stats_debugfs_item {
>         { n, offsetof(struct kvm_vcpu, stat.common.x),                         \
>           KVM_STAT_VCPU, ## __VA_ARGS__ }
>
> +#define STATS_DESC(stat, type, unit, scale, exp)                              \
> +       {                                                                      \
> +               {                                                              \

.desc = {

> +                       .flags = type | unit | scale,                          \
> +                       .exponent = exp,                                       \
> +                       .size = 1                                              \
> +               },                                                             \
> +               .name = stat,                                                  \
> +       }
> +#define STATS_DESC_CUMULATIVE(name, unit, scale, exponent)                    \
> +       STATS_DESC(name, KVM_STATS_TYPE_CUMULATIVE, unit, scale, exponent)
> +#define STATS_DESC_INSTANT(name, unit, scale, exponent)                               \
> +       STATS_DESC(name, KVM_STATS_TYPE_INSTANT, unit, scale, exponent)
> +
> +/* Cumulative counter */
> +#define STATS_DESC_COUNTER(name)                                              \
> +       STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_NONE,                       \
> +               KVM_STATS_BASE_POW10, 0)
> +/* Instantaneous counter */
> +#define STATS_DESC_ICOUNTER(name)                                             \
> +       STATS_DESC_INSTANT(name, KVM_STATS_UNIT_NONE,                          \
> +               KVM_STATS_BASE_POW10, 0)
> +
> +/* Cumulative clock cycles */
> +#define STATS_DESC_CYCLE(name)                                                \
> +       STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_CYCLES,                     \
> +               KVM_STATS_BASE_POW10, 0)
> +/* Instantaneous clock cycles */
> +#define STATS_DESC_ICYCLE(name)                                                       \
> +       STATS_DESC_INSTANT(name, KVM_STATS_UNIT_CYCLES,                        \
> +               KVM_STATS_BASE_POW10, 0)
> +
> +/* Cumulative memory size in Byte */
> +#define STATS_DESC_SIZE_BYTE(name)                                            \
> +       STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES,                      \
> +               KVM_STATS_BASE_POW2, 0)
> +/* Cumulative memory size in KiByte */
> +#define STATS_DESC_SIZE_KBYTE(name)                                           \
> +       STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES,                      \
> +               KVM_STATS_BASE_POW2, 10)
> +/* Cumulative memory size in MiByte */
> +#define STATS_DESC_SIZE_MBYTE(name)                                           \
> +       STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES,                      \
> +               KVM_STATS_BASE_POW2, 20)
> +/* Cumulative memory size in GiByte */
> +#define STATS_DESC_SIZE_GBYTE(name)                                           \
> +       STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES,                      \
> +               KVM_STATS_BASE_POW2, 30)
> +
> +/* Instantaneous memory size in Byte */
> +#define STATS_DESC_ISIZE_BYTE(name)                                           \
> +       STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES,                         \
> +               KVM_STATS_BASE_POW2, 0)
> +/* Instantaneous memory size in KiByte */
> +#define STATS_DESC_ISIZE_KBYTE(name)                                          \
> +       STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES,                         \
> +               KVM_STATS_BASE_POW2, 10)
> +/* Instantaneous memory size in MiByte */
> +#define STATS_DESC_ISIZE_MBYTE(name)                                          \
> +       STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES,                         \
> +               KVM_STATS_BASE_POW2, 20)
> +/* Instantaneous memory size in GiByte */
> +#define STATS_DESC_ISIZE_GBYTE(name)                                          \
> +       STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES,                         \
> +               KVM_STATS_BASE_POW2, 30)
> +
> +/* Cumulative time in second */
> +#define STATS_DESC_TIME_SEC(name)                                             \
> +       STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS,                    \
> +               KVM_STATS_BASE_POW10, 0)
> +/* Cumulative time in millisecond */
> +#define STATS_DESC_TIME_MSEC(name)                                            \
> +       STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS,                    \
> +               KVM_STATS_BASE_POW10, -3)
> +/* Cumulative time in microsecond */
> +#define STATS_DESC_TIME_USEC(name)                                            \
> +       STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS,                    \
> +               KVM_STATS_BASE_POW10, -6)
> +/* Cumulative time in nanosecond */
> +#define STATS_DESC_TIME_NSEC(name)                                            \
> +       STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS,                    \
> +               KVM_STATS_BASE_POW10, -9)
> +
> +/* Instantaneous time in second */
> +#define STATS_DESC_ITIME_SEC(name)                                            \
> +       STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS,                       \
> +               KVM_STATS_BASE_POW10, 0)
> +/* Instantaneous time in millisecond */
> +#define STATS_DESC_ITIME_MSEC(name)                                           \
> +       STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS,                       \
> +               KVM_STATS_BASE_POW10, -3)
> +/* Instantaneous time in microsecond */
> +#define STATS_DESC_ITIME_USEC(name)                                           \
> +       STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS,                       \
> +               KVM_STATS_BASE_POW10, -6)
> +/* Instantaneous time in nanosecond */
> +#define STATS_DESC_ITIME_NSEC(name)                                           \
> +       STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS,                       \
> +               KVM_STATS_BASE_POW10, -9)
> +
> +#define DEFINE_VM_STATS_DESC(...) {                                           \
> +       STATS_DESC_COUNTER("remote_tlb_flush"),                                \
> +       ## __VA_ARGS__                                                         \
> +}
> +
> +#define DEFINE_VCPU_STATS_DESC(...) {                                         \
> +       STATS_DESC_COUNTER("halt_successful_poll"),                            \
> +       STATS_DESC_COUNTER("halt_attempted_poll"),                             \
> +       STATS_DESC_COUNTER("halt_poll_invalid"),                               \
> +       STATS_DESC_COUNTER("halt_wakeup"),                                     \
> +       STATS_DESC_TIME_NSEC("halt_poll_success_ns"),                          \
> +       STATS_DESC_TIME_NSEC("halt_poll_fail_ns"),                             \
> +       ## __VA_ARGS__                                                         \
> +}
> +
>  extern struct kvm_stats_debugfs_item debugfs_entries[];
>  extern struct dentry *kvm_debugfs_dir;
> +extern struct _kvm_stats_header kvm_vm_stats_header;
> +extern struct _kvm_stats_header kvm_vcpu_stats_header;
> +extern struct _kvm_stats_desc kvm_vm_stats_desc[];
> +extern struct _kvm_stats_desc kvm_vcpu_stats_desc[];
>
>  #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
>  static inline int mmu_notifier_retry(struct kvm *kvm, unsigned long mmu_seq)
> diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
> index 3fd9a7e9d90c..82db825c392c 100644
> --- a/include/uapi/linux/kvm.h
> +++ b/include/uapi/linux/kvm.h
> @@ -1082,6 +1082,7 @@ struct kvm_ppc_resize_hpt {
>  #define KVM_CAP_SGX_ATTRIBUTE 196
>  #define KVM_CAP_VM_COPY_ENC_CONTEXT_FROM 197
>  #define KVM_CAP_PTP_KVM 198
> +#define KVM_CAP_STATS_BINARY_FD 199
>
>  #ifdef KVM_CAP_IRQ_ROUTING
>
> @@ -1898,4 +1899,53 @@ struct kvm_dirty_gfn {
>  #define KVM_BUS_LOCK_DETECTION_OFF             (1 << 0)
>  #define KVM_BUS_LOCK_DETECTION_EXIT            (1 << 1)
>
> +#define KVM_STATS_ID_MAXLEN            64
> +
> +struct kvm_stats_header {
> +       char id[KVM_STATS_ID_MAXLEN];
> +       __u32 name_size;
> +       __u32 count;
> +       __u32 desc_offset;
> +       __u32 data_offset;
> +};
> +
> +#define KVM_STATS_TYPE_SHIFT           0
> +#define KVM_STATS_TYPE_MASK            (0xF << KVM_STATS_TYPE_SHIFT)
> +#define KVM_STATS_TYPE_CUMULATIVE      (0x0 << KVM_STATS_TYPE_SHIFT)
> +#define KVM_STATS_TYPE_INSTANT         (0x1 << KVM_STATS_TYPE_SHIFT)
> +#define KVM_STATS_TYPE_MAX             KVM_STATS_TYPE_INSTANT
> +
> +#define KVM_STATS_UNIT_SHIFT           4
> +#define KVM_STATS_UNIT_MASK            (0xF << KVM_STATS_UNIT_SHIFT)
> +#define KVM_STATS_UNIT_NONE            (0x0 << KVM_STATS_UNIT_SHIFT)
> +#define KVM_STATS_UNIT_BYTES           (0x1 << KVM_STATS_UNIT_SHIFT)
> +#define KVM_STATS_UNIT_SECONDS         (0x2 << KVM_STATS_UNIT_SHIFT)
> +#define KVM_STATS_UNIT_CYCLES          (0x3 << KVM_STATS_UNIT_SHIFT)
> +#define KVM_STATS_UNIT_MAX             KVM_STATS_UNIT_CYCLES
> +
> +#define KVM_STATS_BASE_SHIFT           8
> +#define KVM_STATS_BASE_MASK            (0xF << KVM_STATS_BASE_SHIFT)
> +#define KVM_STATS_BASE_POW10           (0x0 << KVM_STATS_BASE_SHIFT)
> +#define KVM_STATS_BASE_POW2            (0x1 << KVM_STATS_BASE_SHIFT)
> +#define KVM_STATS_BASE_MAX             KVM_STATS_BASE_POW2
> +
> +struct kvm_stats_desc {
> +       __u32 flags;
> +       __s16 exponent;
> +       __u16 size;
> +       __u32 unused1;
> +       __u32 unused2;
> +       char name[0];
> +};
> +
> +struct kvm_vm_stats_data {
> +       unsigned long value[0];
> +};
> +
> +struct kvm_vcpu_stats_data {
> +       __u64 value[0];
> +};
> +
> +#define KVM_STATS_GETFD  _IOR(KVMIO,  0xcc, struct kvm_stats_header)
> +
>  #endif /* __LINUX_KVM_H */
> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> index 34a4cf265297..9e20e2ff78b4 100644
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -3409,6 +3409,120 @@ static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
>         return 0;
>  }
>
> +static ssize_t kvm_stats_read(char *id, struct _kvm_stats_header *header,
> +               struct _kvm_stats_desc *desc, void *stats, size_t size_stats,
> +               char __user *user_buffer, size_t size, loff_t *offset)
> +{
> +       ssize_t copylen, len, remain = size;
> +       size_t size_header, size_desc;
> +       loff_t pos = *offset;
> +       char __user *dest = user_buffer;
> +       void *src;
> +
> +       size_header = sizeof(*header);
> +       size_desc = header->count * sizeof(*desc);
> +
> +       len = KVM_STATS_ID_MAXLEN + size_header + size_desc + size_stats - pos;
> +       len = min(len, remain);
> +       if (len <= 0)
> +               return 0;
> +       remain = len;
> +
> +       /* Copy kvm stats header id string */
> +       copylen = KVM_STATS_ID_MAXLEN - pos;
> +       copylen = min(copylen, remain);
> +       if (copylen > 0) {
> +               src = id + pos;
> +               if (copy_to_user(dest, src, copylen))
> +                       return -EFAULT;
> +               remain -= copylen;
> +               pos += copylen;
> +               dest += copylen;
> +       }
> +       /* Copy kvm stats header */
> +       copylen = KVM_STATS_ID_MAXLEN + size_header - pos;
> +       copylen = min(copylen, remain);
> +       if (copylen > 0) {
> +               src = header + pos - KVM_STATS_ID_MAXLEN;
> +               if (copy_to_user(dest, src, copylen))
> +                       return -EFAULT;
> +               remain -= copylen;
> +               pos += copylen;
> +               dest += copylen;
> +       }
> +       /* Copy kvm stats descriptors */
> +       copylen = header->desc_offset + size_desc - pos;
> +       copylen = min(copylen, remain);
> +       if (copylen > 0) {
> +               src = desc + pos - header->desc_offset;
> +               if (copy_to_user(dest, src, copylen))
> +                       return -EFAULT;
> +               remain -= copylen;
> +               pos += copylen;
> +               dest += copylen;
> +       }
> +       /* Copy kvm stats values */
> +       copylen = header->data_offset + size_stats - pos;
> +       copylen = min(copylen, remain);
> +       if (copylen > 0) {
> +               src = stats + pos - header->data_offset;
> +               if (copy_to_user(dest, src, copylen))
> +                       return -EFAULT;
> +               remain -= copylen;
> +               pos += copylen;
> +               dest += copylen;
> +       }
> +
> +       *offset = pos;
> +       return len;
> +}
> +
> +static ssize_t kvm_vcpu_stats_read(struct file *file, char __user *user_buffer,
> +                             size_t size, loff_t *offset)
> +{
> +       char id[KVM_STATS_ID_MAXLEN];
> +       struct kvm_vcpu *vcpu = file->private_data;
> +
> +       snprintf(id, sizeof(id), "kvm-%d/vcpu-%d",
> +                       task_pid_nr(current), vcpu->vcpu_id);
> +       return kvm_stats_read(id, &kvm_vcpu_stats_header,
> +                       &kvm_vcpu_stats_desc[0], &vcpu->stat,
> +                       sizeof(vcpu->stat), user_buffer, size, offset);
> +}
> +
> +static const struct file_operations kvm_vcpu_stats_fops = {
> +       .read = kvm_vcpu_stats_read,
> +       .llseek = noop_llseek,
> +};
> +
> +static int kvm_vcpu_ioctl_get_statsfd(struct kvm_vcpu *vcpu)
> +{
> +       int error, fd;
> +       struct file *file;
> +       char name[15 + ITOA_MAX_LEN + 1];
> +
> +       snprintf(name, sizeof(name), "kvm-vcpu-stats:%d", vcpu->vcpu_id);
> +
> +       error = get_unused_fd_flags(O_CLOEXEC);
> +       if (error < 0)
> +               return error;
> +       fd = error;
> +
> +       file = anon_inode_getfile(name, &kvm_vcpu_stats_fops, vcpu, O_RDONLY);
> +       if (IS_ERR(file)) {
> +               error = PTR_ERR(file);
> +               goto err_put_unused_fd;
> +       }
> +       file->f_mode |= FMODE_PREAD;
> +       fd_install(fd, file);
> +
> +       return fd;
> +
> +err_put_unused_fd:
> +       put_unused_fd(fd);
> +       return error;
> +}
> +
>  static long kvm_vcpu_ioctl(struct file *filp,
>                            unsigned int ioctl, unsigned long arg)
>  {
> @@ -3606,6 +3720,10 @@ static long kvm_vcpu_ioctl(struct file *filp,
>                 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
>                 break;
>         }
> +       case KVM_STATS_GETFD: {
> +               r = kvm_vcpu_ioctl_get_statsfd(vcpu);
> +               break;
> +       }
>         default:
>                 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
>         }
> @@ -3864,6 +3982,8 @@ static long kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg)
>  #else
>                 return 0;
>  #endif
> +       case KVM_CAP_STATS_BINARY_FD:
> +               return 1;
>         default:
>                 break;
>         }
> @@ -3967,6 +4087,48 @@ static int kvm_vm_ioctl_enable_cap_generic(struct kvm *kvm,
>         }
>  }
>
> +static ssize_t kvm_vm_stats_read(struct file *file, char __user *user_buffer,
> +                             size_t size, loff_t *offset)
> +{
> +       char id[KVM_STATS_ID_MAXLEN];
> +       struct kvm *kvm = file->private_data;
> +
> +       snprintf(id, sizeof(id), "kvm-%d", task_pid_nr(current));
> +       return kvm_stats_read(id, &kvm_vm_stats_header, &kvm_vm_stats_desc[0],
> +               &kvm->stat, sizeof(kvm->stat), user_buffer, size, offset);
> +}
> +
> +static const struct file_operations kvm_vm_stats_fops = {
> +       .read = kvm_vm_stats_read,
> +       .llseek = noop_llseek,
> +};
> +
> +static int kvm_vm_ioctl_get_statsfd(struct kvm *kvm)
> +{
> +       int error, fd;
> +       struct file *file;
> +
> +       error = get_unused_fd_flags(O_CLOEXEC);
> +       if (error < 0)
> +               return error;
> +       fd = error;
> +
> +       file = anon_inode_getfile("kvm-vm-stats",
> +                       &kvm_vm_stats_fops, kvm, O_RDONLY);
> +       if (IS_ERR(file)) {
> +               error = PTR_ERR(file);
> +               goto err_put_unused_fd;
> +       }
> +       file->f_mode |= FMODE_PREAD;
> +       fd_install(fd, file);
> +
> +       return fd;
> +
> +err_put_unused_fd:
> +       put_unused_fd(fd);
> +       return error;
> +}
> +
>  static long kvm_vm_ioctl(struct file *filp,
>                            unsigned int ioctl, unsigned long arg)
>  {
> @@ -4149,6 +4311,9 @@ static long kvm_vm_ioctl(struct file *filp,
>         case KVM_RESET_DIRTY_RINGS:
>                 r = kvm_vm_ioctl_reset_dirty_pages(kvm);
>                 break;
> +       case KVM_STATS_GETFD:
> +               r = kvm_vm_ioctl_get_statsfd(kvm);
> +               break;
>         default:
>                 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
>         }
> --
> 2.31.1.818.g46aad6cb9e-goog
>
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Re: [PATCH v6 2/4] KVM: stats: Add fd-based API to read binary stats data

[Krish Sadhukhan]

On 5/24/21 8:18 AM, Jing Zhang wrote:
> Provides a file descriptor per VM to read VM stats info/data.
> Provides a file descriptor per vCPU to read vCPU stats info/data.
>
> Reviewed-by: David Matlack<dmatlack@google.com>
> Reviewed-by: Ricardo Koller<ricarkol@google.com>
> Signed-off-by: Jing Zhang<jingzhangos@google.com>
> ---
>   arch/arm64/kvm/guest.c    |  26 ++++++
>   arch/mips/kvm/mips.c      |  52 ++++++++++++
>   arch/powerpc/kvm/book3s.c |  52 ++++++++++++
>   arch/powerpc/kvm/booke.c  |  45 +++++++++++
>   arch/s390/kvm/kvm-s390.c  | 117 +++++++++++++++++++++++++++
>   arch/x86/kvm/x86.c        |  53 ++++++++++++
>   include/linux/kvm_host.h  | 132 ++++++++++++++++++++++++++++++
>   include/uapi/linux/kvm.h  |  50 ++++++++++++
>   virt/kvm/kvm_main.c       | 165 ++++++++++++++++++++++++++++++++++++++
>   9 files changed, 692 insertions(+)
>
> diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
> index 0e41331b0911..1cc1d83630ac 100644
> --- a/arch/arm64/kvm/guest.c
> +++ b/arch/arm64/kvm/guest.c
> @@ -28,6 +28,32 @@
>   
>   #include "trace.h"
>   
> +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC();
> +
> +struct _kvm_stats_header kvm_vm_stats_header = {
> +	.name_size = KVM_STATS_NAME_LEN,
> +	.count = ARRAY_SIZE(kvm_vm_stats_desc),
> +	.desc_offset = sizeof(struct kvm_stats_header),
> +	.data_offset = sizeof(struct kvm_stats_header) +
> +		sizeof(kvm_vm_stats_desc),
> +};
> +
> +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
> +	STATS_DESC_COUNTER("hvc_exit_stat"),
> +	STATS_DESC_COUNTER("wfe_exit_stat"),
> +	STATS_DESC_COUNTER("wfi_exit_stat"),
> +	STATS_DESC_COUNTER("mmio_exit_user"),
> +	STATS_DESC_COUNTER("mmio_exit_kernel"),
> +	STATS_DESC_COUNTER("exits"));
> +
> +struct _kvm_stats_header kvm_vcpu_stats_header = {
> +	.name_size = KVM_STATS_NAME_LEN,
> +	.count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> +	.desc_offset = sizeof(struct kvm_stats_header),
> +	.data_offset = sizeof(struct kvm_stats_header) +
> +		sizeof(kvm_vcpu_stats_desc),
> +};
> +
>   struct kvm_stats_debugfs_item debugfs_entries[] = {
>   	VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
>   	VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll), diff --git a/arch/mips/kvm/mips.c 
> b/arch/mips/kvm/mips.c index f4fc60c05e9c..f17a65743ccd 100644 --- 
> a/arch/mips/kvm/mips.c +++ b/arch/mips/kvm/mips.c @@ -38,6 +38,58 @@ 
> #define VECTORSPACING 0x100 /* for EI/VI mode */ #endif +struct 
> _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(); + 
> +struct _kvm_stats_header kvm_vm_stats_header = { + .name_size = 
> KVM_STATS_NAME_LEN, + .count = ARRAY_SIZE(kvm_vm_stats_desc), + 
> .desc_offset = sizeof(struct kvm_stats_header), + .data_offset = 
> sizeof(struct kvm_stats_header) + + sizeof(kvm_vm_stats_desc), +}; + 
> +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = 
> DEFINE_VCPU_STATS_DESC( + STATS_DESC_COUNTER("wait_exits"),
> +	STATS_DESC_COUNTER("cache_exits"),
> +	STATS_DESC_COUNTER("signal_exits"),
> +	STATS_DESC_COUNTER("int_exits"),
> +	STATS_DESC_COUNTER("cop_unusable_exits"),
> +	STATS_DESC_COUNTER("tlbmod_exits"),
> +	STATS_DESC_COUNTER("tlbmiss_ld_exits"),
> +	STATS_DESC_COUNTER("tlbmiss_st_exits"),
> +	STATS_DESC_COUNTER("addrerr_st_exits"),
> +	STATS_DESC_COUNTER("addrerr_ld_exits"),
> +	STATS_DESC_COUNTER("syscall_exits"),
> +	STATS_DESC_COUNTER("resvd_inst_exits"),
> +	STATS_DESC_COUNTER("break_inst_exits"),
> +	STATS_DESC_COUNTER("trap_inst_exits"),
> +	STATS_DESC_COUNTER("msa_fpe_exits"),
> +	STATS_DESC_COUNTER("fpe_exits"),
> +	STATS_DESC_COUNTER("msa_disabled_exits"),
> +	STATS_DESC_COUNTER("flush_dcache_exits"),
> +#ifdef CONFIG_KVM_MIPS_VZ
> +	STATS_DESC_COUNTER("vz_gpsi_exits"),
> +	STATS_DESC_COUNTER("vz_gsfc_exits"),
> +	STATS_DESC_COUNTER("vz_hc_exits"),
> +	STATS_DESC_COUNTER("vz_grr_exits"),
> +	STATS_DESC_COUNTER("vz_gva_exits"),
> +	STATS_DESC_COUNTER("vz_ghfc_exits"),
> +	STATS_DESC_COUNTER("vz_gpa_exits"),
> +	STATS_DESC_COUNTER("vz_resvd_exits"),
> +#ifdef CONFIG_CPU_LOONGSON64
> +	STATS_DESC_COUNTER("vz_cpucfg_exits"),
> +#endif
> +#endif
> +	);
> +
> +struct _kvm_stats_header kvm_vcpu_stats_header = {
> +	.name_size = KVM_STATS_NAME_LEN,
> +	.count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> +	.desc_offset = sizeof(struct kvm_stats_header),
> +	.data_offset = sizeof(struct kvm_stats_header) +
> +		sizeof(kvm_vcpu_stats_desc),
> +};
> +
>   struct kvm_stats_debugfs_item debugfs_entries[] = {
>   	VCPU_STAT("wait", wait_exits),
>   	VCPU_STAT("cache", cache_exits),
> diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
> index bd3a10e1fdaf..5e8ee0d39ef9 100644
> --- a/arch/powerpc/kvm/book3s.c
> +++ b/arch/powerpc/kvm/book3s.c
> @@ -38,6 +38,58 @@
>   
>   /* #define EXIT_DEBUG */
>   
> +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(
> +	STATS_DESC_ICOUNTER("num_2M_pages"),
> +	STATS_DESC_ICOUNTER("num_1G_pages"));
> +
> +struct _kvm_stats_header kvm_vm_stats_header = {
> +	.name_size = KVM_STATS_NAME_LEN,
> +	.count = ARRAY_SIZE(kvm_vm_stats_desc),
> +	.desc_offset = sizeof(struct kvm_stats_header),
> +	.data_offset = sizeof(struct kvm_stats_header) +
> +		sizeof(kvm_vm_stats_desc),
> +};
> +
> +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
> +	STATS_DESC_COUNTER("sum_exits"),
> +	STATS_DESC_COUNTER("mmio_exits"),
> +	STATS_DESC_COUNTER("signal_exits"),
> +	STATS_DESC_COUNTER("light_exits"),
> +	STATS_DESC_COUNTER("itlb_real_miss_exits"),
> +	STATS_DESC_COUNTER("itlb_virt_miss_exits"),
> +	STATS_DESC_COUNTER("dtlb_real_miss_exits"),
> +	STATS_DESC_COUNTER("dtlb_virt_miss_exits"),
> +	STATS_DESC_COUNTER("syscall_exits"),
> +	STATS_DESC_COUNTER("isi_exits"),
> +	STATS_DESC_COUNTER("dsi_exits"),
> +	STATS_DESC_COUNTER("emulated_inst_exits"),
> +	STATS_DESC_COUNTER("dec_exits"),
> +	STATS_DESC_COUNTER("ext_intr_exits"),
> +	STATS_DESC_TIME_NSEC("halt_wait_ns"),
> +	STATS_DESC_COUNTER("halt_successful_wait"),
> +	STATS_DESC_COUNTER("dbell_exits"),
> +	STATS_DESC_COUNTER("gdbell_exits"),
> +	STATS_DESC_COUNTER("ld"),
> +	STATS_DESC_COUNTER("st"),
> +	STATS_DESC_COUNTER("pf_storage"),
> +	STATS_DESC_COUNTER("pf_instruc"),
> +	STATS_DESC_COUNTER("sp_storage"),
> +	STATS_DESC_COUNTER("sp_instruc"),
> +	STATS_DESC_COUNTER("queue_intr"),
> +	STATS_DESC_COUNTER("ld_slow"),
> +	STATS_DESC_COUNTER("st_slow"),
> +	STATS_DESC_COUNTER("pthru_all"),
> +	STATS_DESC_COUNTER("pthru_host"),
> +	STATS_DESC_COUNTER("pthru_bad_aff"));
> +
> +struct _kvm_stats_header kvm_vcpu_stats_header = {
> +	.name_size = KVM_STATS_NAME_LEN,
> +	.count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> +	.desc_offset = sizeof(struct kvm_stats_header),
> +	.data_offset = sizeof(struct kvm_stats_header) +
> +		sizeof(kvm_vcpu_stats_desc),
> +};
> +
>   struct kvm_stats_debugfs_item debugfs_entries[] = {
>   	VCPU_STAT("exits", sum_exits),
>   	VCPU_STAT("mmio", mmio_exits),
> diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
> index 07fdd7a1254a..86d221e9193e 100644
> --- a/arch/powerpc/kvm/booke.c
> +++ b/arch/powerpc/kvm/booke.c
> @@ -36,6 +36,51 @@
>   
>   unsigned long kvmppc_booke_handlers;
>   
> +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(
> +	STATS_DESC_ICOUNTER("num_2M_pages"),
> +	STATS_DESC_ICOUNTER("num_1G_pages"));
> +
> +struct _kvm_stats_header kvm_vm_stats_header = {
> +	.name_size = KVM_STATS_NAME_LEN,
> +	.count = ARRAY_SIZE(kvm_vm_stats_desc),
> +	.desc_offset = sizeof(struct kvm_stats_header),
> +	.data_offset = sizeof(struct kvm_stats_header) +
> +		sizeof(kvm_vm_stats_desc),
> +};
> +
> +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
> +	STATS_DESC_COUNTER("sum_exits"),
> +	STATS_DESC_COUNTER("mmio_exits"),
> +	STATS_DESC_COUNTER("signal_exits"),
> +	STATS_DESC_COUNTER("light_exits"),
> +	STATS_DESC_COUNTER("itlb_real_miss_exits"),
> +	STATS_DESC_COUNTER("itlb_virt_miss_exits"),
> +	STATS_DESC_COUNTER("dtlb_real_miss_exits"),
> +	STATS_DESC_COUNTER("dtlb_virt_miss_exits"),
> +	STATS_DESC_COUNTER("syscall_exits"),
> +	STATS_DESC_COUNTER("isi_exits"),
> +	STATS_DESC_COUNTER("dsi_exits"),
> +	STATS_DESC_COUNTER("emulated_inst_exits"),
> +	STATS_DESC_COUNTER("dec_exits"),
> +	STATS_DESC_COUNTER("ext_intr_exits"),
> +	STATS_DESC_TIME_NSEC("halt_wait_ns"),
> +	STATS_DESC_COUNTER("halt_successful_wait"),
> +	STATS_DESC_COUNTER("dbell_exits"),
> +	STATS_DESC_COUNTER("gdbell_exits"),
> +	STATS_DESC_COUNTER("ld"),
> +	STATS_DESC_COUNTER("st"),
> +	STATS_DESC_COUNTER("pthru_all"),
> +	STATS_DESC_COUNTER("pthru_host"),
> +	STATS_DESC_COUNTER("pthru_bad_aff"));
> +
> +struct _kvm_stats_header kvm_vcpu_stats_header = {
> +	.name_size = KVM_STATS_NAME_LEN,
> +	.count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> +	.desc_offset = sizeof(struct kvm_stats_header),
> +	.data_offset = sizeof(struct kvm_stats_header) +
> +		sizeof(kvm_vcpu_stats_desc),
> +};
> +
>   struct kvm_stats_debugfs_item debugfs_entries[] = {
>   	VCPU_STAT("mmio", mmio_exits),
>   	VCPU_STAT("sig", signal_exits),
> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> index d6bf3372bb10..003feee79fce 100644
> --- a/arch/s390/kvm/kvm-s390.c
> +++ b/arch/s390/kvm/kvm-s390.c
> @@ -58,6 +58,123 @@
>   #define VCPU_IRQS_MAX_BUF (sizeof(struct kvm_s390_irq) * \
>   			   (KVM_MAX_VCPUS + LOCAL_IRQS))
>   
> +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(
> +	STATS_DESC_COUNTER("inject_io"),
> +	STATS_DESC_COUNTER("inject_float_mchk"),
> +	STATS_DESC_COUNTER("inject_pfault_done"),
> +	STATS_DESC_COUNTER("inject_service_signal"),
> +	STATS_DESC_COUNTER("inject_virtio"));
> +
> +struct _kvm_stats_header kvm_vm_stats_header = {
> +	.name_size = KVM_STATS_NAME_LEN,
> +	.count = ARRAY_SIZE(kvm_vm_stats_desc),
> +	.desc_offset = sizeof(struct kvm_stats_header),
> +	.data_offset = sizeof(struct kvm_stats_header) +
> +		sizeof(kvm_vm_stats_desc),
> +};
> +
> +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
> +	STATS_DESC_COUNTER("exit_userspace"),
> +	STATS_DESC_COUNTER("exit_null"),
> +	STATS_DESC_COUNTER("exit_external_request"),
> +	STATS_DESC_COUNTER("exit_io_request"),
> +	STATS_DESC_COUNTER("exit_external_interrupt"),
> +	STATS_DESC_COUNTER("exit_stop_request"),
> +	STATS_DESC_COUNTER("exit_validity"),
> +	STATS_DESC_COUNTER("exit_instruction"),
> +	STATS_DESC_COUNTER("exit_pei"),
> +	STATS_DESC_COUNTER("halt_no_poll_steal"),
> +	STATS_DESC_COUNTER("instruction_lctl"),
> +	STATS_DESC_COUNTER("instruction_lctlg"),
> +	STATS_DESC_COUNTER("instruction_stctl"),
> +	STATS_DESC_COUNTER("instruction_stctg"),
> +	STATS_DESC_COUNTER("exit_program_interruption"),
> +	STATS_DESC_COUNTER("exit_instr_and_program"),
> +	STATS_DESC_COUNTER("exit_operation_exception"),
> +	STATS_DESC_COUNTER("deliver_ckc"),
> +	STATS_DESC_COUNTER("deliver_cputm"),
> +	STATS_DESC_COUNTER("deliver_external_call"),
> +	STATS_DESC_COUNTER("deliver_emergency_signal"),
> +	STATS_DESC_COUNTER("deliver_service_signal"),
> +	STATS_DESC_COUNTER("deliver_virtio"),
> +	STATS_DESC_COUNTER("deliver_stop_signal"),
> +	STATS_DESC_COUNTER("deliver_prefix_signal"),
> +	STATS_DESC_COUNTER("deliver_restart_signal"),
> +	STATS_DESC_COUNTER("deliver_program"),
> +	STATS_DESC_COUNTER("deliver_io"),
> +	STATS_DESC_COUNTER("deliver_machine_check"),
> +	STATS_DESC_COUNTER("exit_wait_state"),
> +	STATS_DESC_COUNTER("inject_ckc"),
> +	STATS_DESC_COUNTER("inject_cputm"),
> +	STATS_DESC_COUNTER("inject_external_call"),
> +	STATS_DESC_COUNTER("inject_emergency_signal"),
> +	STATS_DESC_COUNTER("inject_mchk"),
> +	STATS_DESC_COUNTER("inject_pfault_init"),
> +	STATS_DESC_COUNTER("inject_program"),
> +	STATS_DESC_COUNTER("inject_restart"),
> +	STATS_DESC_COUNTER("inject_set_prefix"),
> +	STATS_DESC_COUNTER("inject_stop_signal"),
> +	STATS_DESC_COUNTER("instruction_epsw"),
> +	STATS_DESC_COUNTER("instruction_gs"),
> +	STATS_DESC_COUNTER("instruction_io_other"),
> +	STATS_DESC_COUNTER("instruction_lpsw"),
> +	STATS_DESC_COUNTER("instruction_lpswe"),
> +	STATS_DESC_COUNTER("instruction_pfmf"),
> +	STATS_DESC_COUNTER("instruction_ptff"),
> +	STATS_DESC_COUNTER("instruction_sck"),
> +	STATS_DESC_COUNTER("instruction_sckpf"),
> +	STATS_DESC_COUNTER("instruction_stidp"),
> +	STATS_DESC_COUNTER("instruction_spx"),
> +	STATS_DESC_COUNTER("instruction_stpx"),
> +	STATS_DESC_COUNTER("instruction_stap"),
> +	STATS_DESC_COUNTER("instruction_iske"),
> +	STATS_DESC_COUNTER("instruction_ri"),
> +	STATS_DESC_COUNTER("instruction_rrbe"),
> +	STATS_DESC_COUNTER("instruction_sske"),
> +	STATS_DESC_COUNTER("instruction_ipte_interlock"),
> +	STATS_DESC_COUNTER("instruction_stsi"),
> +	STATS_DESC_COUNTER("instruction_stfl"),
> +	STATS_DESC_COUNTER("instruction_tb"),
> +	STATS_DESC_COUNTER("instruction_tpi"),
> +	STATS_DESC_COUNTER("instruction_tprot"),
> +	STATS_DESC_COUNTER("instruction_tsch"),
> +	STATS_DESC_COUNTER("instruction_sie"),
> +	STATS_DESC_COUNTER("instruction_essa"),
> +	STATS_DESC_COUNTER("instruction_sthyi"),
> +	STATS_DESC_COUNTER("instruction_sigp_sense"),
> +	STATS_DESC_COUNTER("instruction_sigp_sense_running"),
> +	STATS_DESC_COUNTER("instruction_sigp_external_call"),
> +	STATS_DESC_COUNTER("instruction_sigp_emergency"),
> +	STATS_DESC_COUNTER("instruction_sigp_cond_emergency"),
> +	STATS_DESC_COUNTER("instruction_sigp_start"),
> +	STATS_DESC_COUNTER("instruction_sigp_stop"),
> +	STATS_DESC_COUNTER("instruction_sigp_stop_store_status"),
> +	STATS_DESC_COUNTER("instruction_sigp_store_status"),
> +	STATS_DESC_COUNTER("instruction_sigp_store_adtl_status"),
> +	STATS_DESC_COUNTER("instruction_sigp_arch"),
> +	STATS_DESC_COUNTER("instruction_sigp_prefix"),
> +	STATS_DESC_COUNTER("instruction_sigp_restart"),
> +	STATS_DESC_COUNTER("instruction_sigp_init_cpu_reset"),
> +	STATS_DESC_COUNTER("instruction_sigp_cpu_reset"),
> +	STATS_DESC_COUNTER("instruction_sigp_unknown"),
> +	STATS_DESC_COUNTER("diagnose_10"),
> +	STATS_DESC_COUNTER("diagnose_44"),
> +	STATS_DESC_COUNTER("diagnose_9c"),
> +	STATS_DESC_COUNTER("diagnose_9c_ignored"),
> +	STATS_DESC_COUNTER("diagnose_258"),
> +	STATS_DESC_COUNTER("diagnose_308"),
> +	STATS_DESC_COUNTER("diagnose_500"),
> +	STATS_DESC_COUNTER("diagnose_other"),
> +	STATS_DESC_COUNTER("pfault_sync"));
> +
> +struct _kvm_stats_header kvm_vcpu_stats_header = {
> +	.name_size = KVM_STATS_NAME_LEN,
> +	.count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> +	.desc_offset = sizeof(struct kvm_stats_header),
> +	.data_offset = sizeof(struct kvm_stats_header) +
> +		sizeof(kvm_vcpu_stats_desc),
> +};
> +
>   struct kvm_stats_debugfs_item debugfs_entries[] = {
>   	VCPU_STAT("userspace_handled", exit_userspace),
>   	VCPU_STAT("exit_null", exit_null),
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index 9a93d80caff6..84880687c199 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -214,6 +214,59 @@ EXPORT_SYMBOL_GPL(host_xss);
>   u64 __read_mostly supported_xss;
>   EXPORT_SYMBOL_GPL(supported_xss);
>   
> +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(
> +	STATS_DESC_COUNTER("mmu_shadow_zapped"),
> +	STATS_DESC_COUNTER("mmu_pte_write"),
> +	STATS_DESC_COUNTER("mmu_pde_zapped"),
> +	STATS_DESC_COUNTER("mmu_flooded"),
> +	STATS_DESC_COUNTER("mmu_recycled"),
> +	STATS_DESC_COUNTER("mmu_cache_miss"),
> +	STATS_DESC_ICOUNTER("mmu_unsync"),
> +	STATS_DESC_ICOUNTER("largepages"),
> +	STATS_DESC_ICOUNTER("nx_largepages_splits"),
> +	STATS_DESC_ICOUNTER("max_mmu_page_hash_collisions"));
> +
> +struct _kvm_stats_header kvm_vm_stats_header = {
> +	.name_size = KVM_STATS_NAME_LEN,
> +	.count = ARRAY_SIZE(kvm_vm_stats_desc),
> +	.desc_offset = sizeof(struct kvm_stats_header),
> +	.data_offset = sizeof(struct kvm_stats_header) +
> +		sizeof(kvm_vm_stats_desc),
> +};
> +
> +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
> +	STATS_DESC_COUNTER("pf_fixed"),
> +	STATS_DESC_COUNTER("pf_guest"),
> +	STATS_DESC_COUNTER("tlb_flush"),
> +	STATS_DESC_COUNTER("invlpg"),
> +	STATS_DESC_COUNTER("exits"),
> +	STATS_DESC_COUNTER("io_exits"),
> +	STATS_DESC_COUNTER("mmio_exits"),
> +	STATS_DESC_COUNTER("signal_exits"),
> +	STATS_DESC_COUNTER("irq_window_exits"),
> +	STATS_DESC_COUNTER("nmi_window_exits"),
> +	STATS_DESC_COUNTER("l1d_flush"),
> +	STATS_DESC_COUNTER("halt_exits"),
> +	STATS_DESC_COUNTER("request_irq_exits"),
> +	STATS_DESC_COUNTER("irq_exits"),
> +	STATS_DESC_COUNTER("host_state_reload"),
> +	STATS_DESC_COUNTER("fpu_reload"),
> +	STATS_DESC_COUNTER("insn_emulation"),
> +	STATS_DESC_COUNTER("insn_emulation_fail"),
> +	STATS_DESC_COUNTER("hypercalls"),
> +	STATS_DESC_COUNTER("irq_injections"),
> +	STATS_DESC_COUNTER("nmi_injections"),
> +	STATS_DESC_COUNTER("req_event"),
> +	STATS_DESC_COUNTER("nested_run"));
> +
> +struct _kvm_stats_header kvm_vcpu_stats_header = {
> +	.name_size = KVM_STATS_NAME_LEN,
> +	.count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> +	.desc_offset = sizeof(struct kvm_stats_header),
> +	.data_offset = sizeof(struct kvm_stats_header) +
> +		sizeof(kvm_vcpu_stats_desc),
> +};
> +
>   struct kvm_stats_debugfs_item debugfs_entries[] = {
>   	VCPU_STAT("pf_fixed", pf_fixed),
>   	VCPU_STAT("pf_guest", pf_guest),
> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> index 97700e41db3b..c0a8e6ddc745 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -1240,6 +1240,19 @@ struct kvm_stats_debugfs_item {
>   	int mode;
>   };
>   
> +struct _kvm_stats_header {
> +	__u32 name_size;
> +	__u32 count;
> +	__u32 desc_offset;
> +	__u32 data_offset;
> +};
> +
> +#define KVM_STATS_NAME_LEN	48
> +struct _kvm_stats_desc {
> +	struct kvm_stats_desc desc;
> +	char name[KVM_STATS_NAME_LEN];
> +};
> +
>   #define KVM_DBGFS_GET_MODE(dbgfs_item)                                         \
>   	((dbgfs_item)->mode ? (dbgfs_item)->mode : 0644)
>   
> @@ -1253,8 +1266,127 @@ struct kvm_stats_debugfs_item {
>   	{ n, offsetof(struct kvm_vcpu, stat.common.x),			       \
>   	  KVM_STAT_VCPU, ## __VA_ARGS__ }
>   
> +#define STATS_DESC(stat, type, unit, scale, exp)			       \
> +	{								       \
> +		{							       \
> +			.flags = type | unit | scale,			       \
> +			.exponent = exp,				       \
> +			.size = 1					       \
> +		},							       \
> +		.name = stat,						       \
> +	}
> +#define STATS_DESC_CUMULATIVE(name, unit, scale, exponent)		       \
> +	STATS_DESC(name, KVM_STATS_TYPE_CUMULATIVE, unit, scale, exponent)
> +#define STATS_DESC_INSTANT(name, unit, scale, exponent)			       \
> +	STATS_DESC(name, KVM_STATS_TYPE_INSTANT, unit, scale, exponent)
> +
> +/* Cumulative counter */
> +#define STATS_DESC_COUNTER(name)					       \
> +	STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_NONE,		       \
> +		KVM_STATS_BASE_POW10, 0)
> +/* Instantaneous counter */
> +#define STATS_DESC_ICOUNTER(name)					       \
> +	STATS_DESC_INSTANT(name, KVM_STATS_UNIT_NONE,			       \
> +		KVM_STATS_BASE_POW10, 0)
> +
> +/* Cumulative clock cycles */
> +#define STATS_DESC_CYCLE(name)						       \
> +	STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_CYCLES,		       \
> +		KVM_STATS_BASE_POW10, 0)
> +/* Instantaneous clock cycles */
> +#define STATS_DESC_ICYCLE(name)						       \
> +	STATS_DESC_INSTANT(name, KVM_STATS_UNIT_CYCLES,			       \
> +		KVM_STATS_BASE_POW10, 0)
> +
> +/* Cumulative memory size in Byte */
> +#define STATS_DESC_SIZE_BYTE(name)					       \
> +	STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES,		       \
> +		KVM_STATS_BASE_POW2, 0)
> +/* Cumulative memory size in KiByte */
> +#define STATS_DESC_SIZE_KBYTE(name)					       \
> +	STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES,		       \
> +		KVM_STATS_BASE_POW2, 10)
> +/* Cumulative memory size in MiByte */
> +#define STATS_DESC_SIZE_MBYTE(name)					       \
> +	STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES,		       \
> +		KVM_STATS_BASE_POW2, 20)
> +/* Cumulative memory size in GiByte */
> +#define STATS_DESC_SIZE_GBYTE(name)					       \
> +	STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES,		       \
> +		KVM_STATS_BASE_POW2, 30)
> +
> +/* Instantaneous memory size in Byte */
> +#define STATS_DESC_ISIZE_BYTE(name)					       \
> +	STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES,			       \
> +		KVM_STATS_BASE_POW2, 0)
> +/* Instantaneous memory size in KiByte */
> +#define STATS_DESC_ISIZE_KBYTE(name)					       \
> +	STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES,			       \
> +		KVM_STATS_BASE_POW2, 10)
> +/* Instantaneous memory size in MiByte */
> +#define STATS_DESC_ISIZE_MBYTE(name)					       \
> +	STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES,			       \
> +		KVM_STATS_BASE_POW2, 20)
> +/* Instantaneous memory size in GiByte */
> +#define STATS_DESC_ISIZE_GBYTE(name)					       \
> +	STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES,			       \
> +		KVM_STATS_BASE_POW2, 30)
> +
> +/* Cumulative time in second */
> +#define STATS_DESC_TIME_SEC(name)					       \
> +	STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS,		       \
> +		KVM_STATS_BASE_POW10, 0)
> +/* Cumulative time in millisecond */
> +#define STATS_DESC_TIME_MSEC(name)					       \
> +	STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS,		       \
> +		KVM_STATS_BASE_POW10, -3)
> +/* Cumulative time in microsecond */
> +#define STATS_DESC_TIME_USEC(name)					       \
> +	STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS,		       \
> +		KVM_STATS_BASE_POW10, -6)
> +/* Cumulative time in nanosecond */
> +#define STATS_DESC_TIME_NSEC(name)					       \
> +	STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS,		       \
> +		KVM_STATS_BASE_POW10, -9)
> +
> +/* Instantaneous time in second */
> +#define STATS_DESC_ITIME_SEC(name)					       \
> +	STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS,		       \
> +		KVM_STATS_BASE_POW10, 0)
> +/* Instantaneous time in millisecond */
> +#define STATS_DESC_ITIME_MSEC(name)					       \
> +	STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS,		       \
> +		KVM_STATS_BASE_POW10, -3)
> +/* Instantaneous time in microsecond */
> +#define STATS_DESC_ITIME_USEC(name)					       \
> +	STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS,		       \
> +		KVM_STATS_BASE_POW10, -6)
> +/* Instantaneous time in nanosecond */
> +#define STATS_DESC_ITIME_NSEC(name)					       \
> +	STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS,		       \
> +		KVM_STATS_BASE_POW10, -9)
> +
> +#define DEFINE_VM_STATS_DESC(...) {					       \
> +	STATS_DESC_COUNTER("remote_tlb_flush"),				       \
> +	## __VA_ARGS__							       \
> +}
> +
> +#define DEFINE_VCPU_STATS_DESC(...) {					       \
> +	STATS_DESC_COUNTER("halt_successful_poll"),			       \
> +	STATS_DESC_COUNTER("halt_attempted_poll"),			       \
> +	STATS_DESC_COUNTER("halt_poll_invalid"),			       \
> +	STATS_DESC_COUNTER("halt_wakeup"),				       \
> +	STATS_DESC_TIME_NSEC("halt_poll_success_ns"),			       \
> +	STATS_DESC_TIME_NSEC("halt_poll_fail_ns"),			       \
> +	## __VA_ARGS__							       \
> +}
> +
>   extern struct kvm_stats_debugfs_item debugfs_entries[];
>   extern struct dentry *kvm_debugfs_dir;
> +extern struct _kvm_stats_header kvm_vm_stats_header;
> +extern struct _kvm_stats_header kvm_vcpu_stats_header;
> +extern struct _kvm_stats_desc kvm_vm_stats_desc[];
> +extern struct _kvm_stats_desc kvm_vcpu_stats_desc[];
>   
>   #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
>   static inline int mmu_notifier_retry(struct kvm *kvm, unsigned long mmu_seq)
> diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
> index 3fd9a7e9d90c..82db825c392c 100644
> --- a/include/uapi/linux/kvm.h
> +++ b/include/uapi/linux/kvm.h
> @@ -1082,6 +1082,7 @@ struct kvm_ppc_resize_hpt {
>   #define KVM_CAP_SGX_ATTRIBUTE 196
>   #define KVM_CAP_VM_COPY_ENC_CONTEXT_FROM 197
>   #define KVM_CAP_PTP_KVM 198
> +#define KVM_CAP_STATS_BINARY_FD 199
>   
>   #ifdef KVM_CAP_IRQ_ROUTING
>   
> @@ -1898,4 +1899,53 @@ struct kvm_dirty_gfn {
>   #define KVM_BUS_LOCK_DETECTION_OFF             (1 << 0)
>   #define KVM_BUS_LOCK_DETECTION_EXIT            (1 << 1)
>   
> +#define KVM_STATS_ID_MAXLEN		64
> +
> +struct kvm_stats_header {
> +	char id[KVM_STATS_ID_MAXLEN];
> +	__u32 name_size;
> +	__u32 count;
> +	__u32 desc_offset;
> +	__u32 data_offset;
> +};
> +
> +#define KVM_STATS_TYPE_SHIFT		0
> +#define KVM_STATS_TYPE_MASK		(0xF << KVM_STATS_TYPE_SHIFT)
> +#define KVM_STATS_TYPE_CUMULATIVE	(0x0 << KVM_STATS_TYPE_SHIFT)
> +#define KVM_STATS_TYPE_INSTANT		(0x1 << KVM_STATS_TYPE_SHIFT)
> +#define KVM_STATS_TYPE_MAX		KVM_STATS_TYPE_INSTANT
> +
> +#define KVM_STATS_UNIT_SHIFT		4
> +#define KVM_STATS_UNIT_MASK		(0xF << KVM_STATS_UNIT_SHIFT)
> +#define KVM_STATS_UNIT_NONE		(0x0 << KVM_STATS_UNIT_SHIFT)
> +#define KVM_STATS_UNIT_BYTES		(0x1 << KVM_STATS_UNIT_SHIFT)
> +#define KVM_STATS_UNIT_SECONDS		(0x2 << KVM_STATS_UNIT_SHIFT)
> +#define KVM_STATS_UNIT_CYCLES		(0x3 << KVM_STATS_UNIT_SHIFT)
> +#define KVM_STATS_UNIT_MAX		KVM_STATS_UNIT_CYCLES
> +
> +#define KVM_STATS_BASE_SHIFT		8
> +#define KVM_STATS_BASE_MASK		(0xF << KVM_STATS_BASE_SHIFT)
> +#define KVM_STATS_BASE_POW10		(0x0 << KVM_STATS_BASE_SHIFT)
> +#define KVM_STATS_BASE_POW2		(0x1 << KVM_STATS_BASE_SHIFT)
> +#define KVM_STATS_BASE_MAX		KVM_STATS_BASE_POW2
> +
> +struct kvm_stats_desc {
> +	__u32 flags;
> +	__s16 exponent;
> +	__u16 size;
> +	__u32 unused1;
> +	__u32 unused2;
> +	char name[0];
> +};
> +
> +struct kvm_vm_stats_data {
> +	unsigned long value[0];
> +};
> +
> +struct kvm_vcpu_stats_data {
> +	__u64 value[0];
> +};
> +
> +#define KVM_STATS_GETFD  _IOR(KVMIO,  0xcc, struct kvm_stats_header)
> +
>   #endif /* __LINUX_KVM_H */
> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> index 34a4cf265297..9e20e2ff78b4 100644
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -3409,6 +3409,120 @@ static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
>   	return 0;
>   }
>   
> +static ssize_t kvm_stats_read(char *id, struct _kvm_stats_header *header,
> +		struct _kvm_stats_desc *desc, void *stats, size_t size_stats,
> +		char __user *user_buffer, size_t size, loff_t *offset)
> +{
> +	ssize_t copylen, len, remain = size;
> +	size_t size_header, size_desc;
> +	loff_t pos = *offset;
> +	char __user *dest = user_buffer;
> +	void *src;
> +
> +	size_header = sizeof(*header);
> +	size_desc = header->count * sizeof(*desc);
> +
> +	len = KVM_STATS_ID_MAXLEN + size_header + size_desc + size_stats - pos;
> +	len = min(len, remain);
> +	if (len <= 0)
> +		return 0;
> +	remain = len;
> +
> +	/* Copy kvm stats header id string */
> +	copylen = KVM_STATS_ID_MAXLEN - pos;
> +	copylen = min(copylen, remain);
> +	if (copylen > 0) {
> +		src = id + pos;
> +		if (copy_to_user(dest, src, copylen))
> +			return -EFAULT;
> +		remain -= copylen;
> +		pos += copylen;
> +		dest += copylen;
> +	}
> +	/* Copy kvm stats header */
> +	copylen = KVM_STATS_ID_MAXLEN + size_header - pos;
> +	copylen = min(copylen, remain);
> +	if (copylen > 0) {
> +		src = header + pos - KVM_STATS_ID_MAXLEN;
> +		if (copy_to_user(dest, src, copylen))
> +			return -EFAULT;
> +		remain -= copylen;
> +		pos += copylen;
> +		dest += copylen;
> +	}
> +	/* Copy kvm stats descriptors */
> +	copylen = header->desc_offset + size_desc - pos;
> +	copylen = min(copylen, remain);
> +	if (copylen > 0) {
> +		src = desc + pos - header->desc_offset;
> +		if (copy_to_user(dest, src, copylen))
> +			return -EFAULT;
> +		remain -= copylen;
> +		pos += copylen;
> +		dest += copylen;
> +	}
> +	/* Copy kvm stats values */
> +	copylen = header->data_offset + size_stats - pos;
> +	copylen = min(copylen, remain);
> +	if (copylen > 0) {
> +		src = stats + pos - header->data_offset;
> +		if (copy_to_user(dest, src, copylen))
> +			return -EFAULT;
> +		remain -= copylen;
> +		pos += copylen;
> +		dest += copylen;
> +	}
> +


Is it possible to re-use the 'if' portion either via a separate function 
? For example,

static int copy_data(void *src)

{
         if (copy_to_user(dest, src, copylen))
             return -EFAULT;
         remain -= copylen;
         pos += copylen;
         dest += copylen;
         return 0;

}

and then calling it as,

         if (copylen > 0)

             copy_data(stats + pos - header->data_offset);

> +	*offset = pos;
> +	return len;
> +}
> +
> +static ssize_t kvm_vcpu_stats_read(struct file *file, char __user *user_buffer,
> +			      size_t size, loff_t *offset)
> +{
> +	char id[KVM_STATS_ID_MAXLEN];
> +	struct kvm_vcpu *vcpu = file->private_data;
> +
> +	snprintf(id, sizeof(id), "kvm-%d/vcpu-%d",
> +			task_pid_nr(current), vcpu->vcpu_id);
> +	return kvm_stats_read(id, &kvm_vcpu_stats_header,
> +			&kvm_vcpu_stats_desc[0], &vcpu->stat,
> +			sizeof(vcpu->stat), user_buffer, size, offset);
> +}
> +
> +static const struct file_operations kvm_vcpu_stats_fops = {
> +	.read = kvm_vcpu_stats_read,
> +	.llseek = noop_llseek,
> +};
> +
> +static int kvm_vcpu_ioctl_get_statsfd(struct kvm_vcpu *vcpu)
> +{
> +	int error, fd;
> +	struct file *file;
> +	char name[15 + ITOA_MAX_LEN + 1];
> +
> +	snprintf(name, sizeof(name), "kvm-vcpu-stats:%d", vcpu->vcpu_id);
> +
> +	error = get_unused_fd_flags(O_CLOEXEC);
> +	if (error < 0)
> +		return error;
> +	fd = error;
> +
> +	file = anon_inode_getfile(name, &kvm_vcpu_stats_fops, vcpu, O_RDONLY);
> +	if (IS_ERR(file)) {
> +		error = PTR_ERR(file);
> +		goto err_put_unused_fd;
> +	}
> +	file->f_mode |= FMODE_PREAD;
> +	fd_install(fd, file);
> +
> +	return fd;
> +
> +err_put_unused_fd:
> +	put_unused_fd(fd);
> +	return error;
> +}
> +
>   static long kvm_vcpu_ioctl(struct file *filp,
>   			   unsigned int ioctl, unsigned long arg)
>   {
> @@ -3606,6 +3720,10 @@ static long kvm_vcpu_ioctl(struct file *filp,
>   		r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
>   		break;
>   	}
> +	case KVM_STATS_GETFD: {
> +		r = kvm_vcpu_ioctl_get_statsfd(vcpu);
> +		break;
> +	}
>   	default:
>   		r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
>   	}
> @@ -3864,6 +3982,8 @@ static long kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg)
>   #else
>   		return 0;
>   #endif
> +	case KVM_CAP_STATS_BINARY_FD:
> +		return 1;
>   	default:
>   		break;
>   	}
> @@ -3967,6 +4087,48 @@ static int kvm_vm_ioctl_enable_cap_generic(struct kvm *kvm,
>   	}
>   }
>   
> +static ssize_t kvm_vm_stats_read(struct file *file, char __user *user_buffer,
> +			      size_t size, loff_t *offset)
> +{
> +	char id[KVM_STATS_ID_MAXLEN];
> +	struct kvm *kvm = file->private_data;
> +
> +	snprintf(id, sizeof(id), "kvm-%d", task_pid_nr(current));
> +	return kvm_stats_read(id, &kvm_vm_stats_header, &kvm_vm_stats_desc[0],
> +		&kvm->stat, sizeof(kvm->stat), user_buffer, size, offset);
> +}
> +
> +static const struct file_operations kvm_vm_stats_fops = {
> +	.read = kvm_vm_stats_read,
> +	.llseek = noop_llseek,
> +};
> +
> +static int kvm_vm_ioctl_get_statsfd(struct kvm *kvm)
> +{
> +	int error, fd;
> +	struct file *file;
> +
> +	error = get_unused_fd_flags(O_CLOEXEC);
> +	if (error < 0)
> +		return error;
> +	fd = error;


Why not just do,

             fd = get_unused_fd_flags(O_CLOEXEC);
             if (fd < 0)
                     return fd;

?

> +
> +	file = anon_inode_getfile("kvm-vm-stats",
> +			&kvm_vm_stats_fops, kvm, O_RDONLY);
> +	if (IS_ERR(file)) {
> +		error = PTR_ERR(file);
> +		goto err_put_unused_fd;


Here, we can do,

                if (IS_ERR(file)) {

                     put_unused_fd(fd);

                     return (PTR_ERR(file));

                 }

and won't need a goto statement.

Same comment for kvm_vcpu_ioctl_get_statsfd().

> +	}
> +	file->f_mode |= FMODE_PREAD;
> +	fd_install(fd, file);
> +
> +	return fd;
> +
> +err_put_unused_fd:
> +	put_unused_fd(fd);
> +	return error;
> +}
> +
>   static long kvm_vm_ioctl(struct file *filp,
>   			   unsigned int ioctl, unsigned long arg)
>   {
> @@ -4149,6 +4311,9 @@ static long kvm_vm_ioctl(struct file *filp,
>   	case KVM_RESET_DIRTY_RINGS:
>   		r = kvm_vm_ioctl_reset_dirty_pages(kvm);
>   		break;
> +	case KVM_STATS_GETFD:


This should be named KVM_GET_STATS_FD.  For example, we have names like 
KVM_GET_DIRTY_LOG etc.

Same comment for KVM_STATS_GETFD.

> +		r = kvm_vm_ioctl_get_statsfd(kvm);


It's probably more readable if we call it kvm_vm_ioctl_get_stats_fd().

> +		break;
>   	default:
>   		r = kvm_arch_vm_ioctl(filp, ioctl, arg);
>   	}

Re: [PATCH v6 2/4] KVM: stats: Add fd-based API to read binary stats data

[Krish Sadhukhan]

On 5/24/21 8:18 AM, Jing Zhang wrote:
> Provides a file descriptor per VM to read VM stats info/data.
> Provides a file descriptor per vCPU to read vCPU stats info/data.
>
> Reviewed-by: David Matlack<dmatlack@google.com>
> Reviewed-by: Ricardo Koller<ricarkol@google.com>
> Signed-off-by: Jing Zhang<jingzhangos@google.com>
> ---
>   arch/arm64/kvm/guest.c    |  26 ++++++
>   arch/mips/kvm/mips.c      |  52 ++++++++++++
>   arch/powerpc/kvm/book3s.c |  52 ++++++++++++
>   arch/powerpc/kvm/booke.c  |  45 +++++++++++
>   arch/s390/kvm/kvm-s390.c  | 117 +++++++++++++++++++++++++++
>   arch/x86/kvm/x86.c        |  53 ++++++++++++
>   include/linux/kvm_host.h  | 132 ++++++++++++++++++++++++++++++
>   include/uapi/linux/kvm.h  |  50 ++++++++++++
>   virt/kvm/kvm_main.c       | 165 ++++++++++++++++++++++++++++++++++++++
>   9 files changed, 692 insertions(+)
>
> diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
> index 0e41331b0911..1cc1d83630ac 100644
> --- a/arch/arm64/kvm/guest.c
> +++ b/arch/arm64/kvm/guest.c
> @@ -28,6 +28,32 @@
>   
>   #include "trace.h"
>   
> +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC();
> +
> +struct _kvm_stats_header kvm_vm_stats_header = {
> +	.name_size = KVM_STATS_NAME_LEN,
> +	.count = ARRAY_SIZE(kvm_vm_stats_desc),
> +	.desc_offset = sizeof(struct kvm_stats_header),
> +	.data_offset = sizeof(struct kvm_stats_header) +
> +		sizeof(kvm_vm_stats_desc),
> +};
> +
> +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
> +	STATS_DESC_COUNTER("hvc_exit_stat"),
> +	STATS_DESC_COUNTER("wfe_exit_stat"),
> +	STATS_DESC_COUNTER("wfi_exit_stat"),
> +	STATS_DESC_COUNTER("mmio_exit_user"),
> +	STATS_DESC_COUNTER("mmio_exit_kernel"),
> +	STATS_DESC_COUNTER("exits"));
> +
> +struct _kvm_stats_header kvm_vcpu_stats_header = {
> +	.name_size = KVM_STATS_NAME_LEN,
> +	.count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> +	.desc_offset = sizeof(struct kvm_stats_header),
> +	.data_offset = sizeof(struct kvm_stats_header) +
> +		sizeof(kvm_vcpu_stats_desc),
> +};
> +
>   struct kvm_stats_debugfs_item debugfs_entries[] = {
>   	VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
>   	VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll), diff --git a/arch/mips/kvm/mips.c 
> b/arch/mips/kvm/mips.c index f4fc60c05e9c..f17a65743ccd 100644 --- 
> a/arch/mips/kvm/mips.c +++ b/arch/mips/kvm/mips.c @@ -38,6 +38,58 @@ 
> #define VECTORSPACING 0x100 /* for EI/VI mode */ #endif +struct 
> _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(); + 
> +struct _kvm_stats_header kvm_vm_stats_header = { + .name_size = 
> KVM_STATS_NAME_LEN, + .count = ARRAY_SIZE(kvm_vm_stats_desc), + 
> .desc_offset = sizeof(struct kvm_stats_header), + .data_offset = 
> sizeof(struct kvm_stats_header) + + sizeof(kvm_vm_stats_desc), +}; + 
> +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = 
> DEFINE_VCPU_STATS_DESC( + STATS_DESC_COUNTER("wait_exits"),
> +	STATS_DESC_COUNTER("cache_exits"),
> +	STATS_DESC_COUNTER("signal_exits"),
> +	STATS_DESC_COUNTER("int_exits"),
> +	STATS_DESC_COUNTER("cop_unusable_exits"),
> +	STATS_DESC_COUNTER("tlbmod_exits"),
> +	STATS_DESC_COUNTER("tlbmiss_ld_exits"),
> +	STATS_DESC_COUNTER("tlbmiss_st_exits"),
> +	STATS_DESC_COUNTER("addrerr_st_exits"),
> +	STATS_DESC_COUNTER("addrerr_ld_exits"),
> +	STATS_DESC_COUNTER("syscall_exits"),
> +	STATS_DESC_COUNTER("resvd_inst_exits"),
> +	STATS_DESC_COUNTER("break_inst_exits"),
> +	STATS_DESC_COUNTER("trap_inst_exits"),
> +	STATS_DESC_COUNTER("msa_fpe_exits"),
> +	STATS_DESC_COUNTER("fpe_exits"),
> +	STATS_DESC_COUNTER("msa_disabled_exits"),
> +	STATS_DESC_COUNTER("flush_dcache_exits"),
> +#ifdef CONFIG_KVM_MIPS_VZ
> +	STATS_DESC_COUNTER("vz_gpsi_exits"),
> +	STATS_DESC_COUNTER("vz_gsfc_exits"),
> +	STATS_DESC_COUNTER("vz_hc_exits"),
> +	STATS_DESC_COUNTER("vz_grr_exits"),
> +	STATS_DESC_COUNTER("vz_gva_exits"),
> +	STATS_DESC_COUNTER("vz_ghfc_exits"),
> +	STATS_DESC_COUNTER("vz_gpa_exits"),
> +	STATS_DESC_COUNTER("vz_resvd_exits"),
> +#ifdef CONFIG_CPU_LOONGSON64
> +	STATS_DESC_COUNTER("vz_cpucfg_exits"),
> +#endif
> +#endif
> +	);
> +
> +struct _kvm_stats_header kvm_vcpu_stats_header = {
> +	.name_size = KVM_STATS_NAME_LEN,
> +	.count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> +	.desc_offset = sizeof(struct kvm_stats_header),
> +	.data_offset = sizeof(struct kvm_stats_header) +
> +		sizeof(kvm_vcpu_stats_desc),
> +};
> +
>   struct kvm_stats_debugfs_item debugfs_entries[] = {
>   	VCPU_STAT("wait", wait_exits),
>   	VCPU_STAT("cache", cache_exits),
> diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
> index bd3a10e1fdaf..5e8ee0d39ef9 100644
> --- a/arch/powerpc/kvm/book3s.c
> +++ b/arch/powerpc/kvm/book3s.c
> @@ -38,6 +38,58 @@
>   
>   /* #define EXIT_DEBUG */
>   
> +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(
> +	STATS_DESC_ICOUNTER("num_2M_pages"),
> +	STATS_DESC_ICOUNTER("num_1G_pages"));
> +
> +struct _kvm_stats_header kvm_vm_stats_header = {
> +	.name_size = KVM_STATS_NAME_LEN,
> +	.count = ARRAY_SIZE(kvm_vm_stats_desc),
> +	.desc_offset = sizeof(struct kvm_stats_header),
> +	.data_offset = sizeof(struct kvm_stats_header) +
> +		sizeof(kvm_vm_stats_desc),
> +};
> +
> +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
> +	STATS_DESC_COUNTER("sum_exits"),
> +	STATS_DESC_COUNTER("mmio_exits"),
> +	STATS_DESC_COUNTER("signal_exits"),
> +	STATS_DESC_COUNTER("light_exits"),
> +	STATS_DESC_COUNTER("itlb_real_miss_exits"),
> +	STATS_DESC_COUNTER("itlb_virt_miss_exits"),
> +	STATS_DESC_COUNTER("dtlb_real_miss_exits"),
> +	STATS_DESC_COUNTER("dtlb_virt_miss_exits"),
> +	STATS_DESC_COUNTER("syscall_exits"),
> +	STATS_DESC_COUNTER("isi_exits"),
> +	STATS_DESC_COUNTER("dsi_exits"),
> +	STATS_DESC_COUNTER("emulated_inst_exits"),
> +	STATS_DESC_COUNTER("dec_exits"),
> +	STATS_DESC_COUNTER("ext_intr_exits"),
> +	STATS_DESC_TIME_NSEC("halt_wait_ns"),
> +	STATS_DESC_COUNTER("halt_successful_wait"),
> +	STATS_DESC_COUNTER("dbell_exits"),
> +	STATS_DESC_COUNTER("gdbell_exits"),
> +	STATS_DESC_COUNTER("ld"),
> +	STATS_DESC_COUNTER("st"),
> +	STATS_DESC_COUNTER("pf_storage"),
> +	STATS_DESC_COUNTER("pf_instruc"),
> +	STATS_DESC_COUNTER("sp_storage"),
> +	STATS_DESC_COUNTER("sp_instruc"),
> +	STATS_DESC_COUNTER("queue_intr"),
> +	STATS_DESC_COUNTER("ld_slow"),
> +	STATS_DESC_COUNTER("st_slow"),
> +	STATS_DESC_COUNTER("pthru_all"),
> +	STATS_DESC_COUNTER("pthru_host"),
> +	STATS_DESC_COUNTER("pthru_bad_aff"));
> +
> +struct _kvm_stats_header kvm_vcpu_stats_header = {
> +	.name_size = KVM_STATS_NAME_LEN,
> +	.count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> +	.desc_offset = sizeof(struct kvm_stats_header),
> +	.data_offset = sizeof(struct kvm_stats_header) +
> +		sizeof(kvm_vcpu_stats_desc),
> +};
> +
>   struct kvm_stats_debugfs_item debugfs_entries[] = {
>   	VCPU_STAT("exits", sum_exits),
>   	VCPU_STAT("mmio", mmio_exits),
> diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
> index 07fdd7a1254a..86d221e9193e 100644
> --- a/arch/powerpc/kvm/booke.c
> +++ b/arch/powerpc/kvm/booke.c
> @@ -36,6 +36,51 @@
>   
>   unsigned long kvmppc_booke_handlers;
>   
> +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(
> +	STATS_DESC_ICOUNTER("num_2M_pages"),
> +	STATS_DESC_ICOUNTER("num_1G_pages"));
> +
> +struct _kvm_stats_header kvm_vm_stats_header = {
> +	.name_size = KVM_STATS_NAME_LEN,
> +	.count = ARRAY_SIZE(kvm_vm_stats_desc),
> +	.desc_offset = sizeof(struct kvm_stats_header),
> +	.data_offset = sizeof(struct kvm_stats_header) +
> +		sizeof(kvm_vm_stats_desc),
> +};
> +
> +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
> +	STATS_DESC_COUNTER("sum_exits"),
> +	STATS_DESC_COUNTER("mmio_exits"),
> +	STATS_DESC_COUNTER("signal_exits"),
> +	STATS_DESC_COUNTER("light_exits"),
> +	STATS_DESC_COUNTER("itlb_real_miss_exits"),
> +	STATS_DESC_COUNTER("itlb_virt_miss_exits"),
> +	STATS_DESC_COUNTER("dtlb_real_miss_exits"),
> +	STATS_DESC_COUNTER("dtlb_virt_miss_exits"),
> +	STATS_DESC_COUNTER("syscall_exits"),
> +	STATS_DESC_COUNTER("isi_exits"),
> +	STATS_DESC_COUNTER("dsi_exits"),
> +	STATS_DESC_COUNTER("emulated_inst_exits"),
> +	STATS_DESC_COUNTER("dec_exits"),
> +	STATS_DESC_COUNTER("ext_intr_exits"),
> +	STATS_DESC_TIME_NSEC("halt_wait_ns"),
> +	STATS_DESC_COUNTER("halt_successful_wait"),
> +	STATS_DESC_COUNTER("dbell_exits"),
> +	STATS_DESC_COUNTER("gdbell_exits"),
> +	STATS_DESC_COUNTER("ld"),
> +	STATS_DESC_COUNTER("st"),
> +	STATS_DESC_COUNTER("pthru_all"),
> +	STATS_DESC_COUNTER("pthru_host"),
> +	STATS_DESC_COUNTER("pthru_bad_aff"));
> +
> +struct _kvm_stats_header kvm_vcpu_stats_header = {
> +	.name_size = KVM_STATS_NAME_LEN,
> +	.count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> +	.desc_offset = sizeof(struct kvm_stats_header),
> +	.data_offset = sizeof(struct kvm_stats_header) +
> +		sizeof(kvm_vcpu_stats_desc),
> +};
> +
>   struct kvm_stats_debugfs_item debugfs_entries[] = {
>   	VCPU_STAT("mmio", mmio_exits),
>   	VCPU_STAT("sig", signal_exits),
> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> index d6bf3372bb10..003feee79fce 100644
> --- a/arch/s390/kvm/kvm-s390.c
> +++ b/arch/s390/kvm/kvm-s390.c
> @@ -58,6 +58,123 @@
>   #define VCPU_IRQS_MAX_BUF (sizeof(struct kvm_s390_irq) * \
>   			   (KVM_MAX_VCPUS + LOCAL_IRQS))
>   
> +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(
> +	STATS_DESC_COUNTER("inject_io"),
> +	STATS_DESC_COUNTER("inject_float_mchk"),
> +	STATS_DESC_COUNTER("inject_pfault_done"),
> +	STATS_DESC_COUNTER("inject_service_signal"),
> +	STATS_DESC_COUNTER("inject_virtio"));
> +
> +struct _kvm_stats_header kvm_vm_stats_header = {
> +	.name_size = KVM_STATS_NAME_LEN,
> +	.count = ARRAY_SIZE(kvm_vm_stats_desc),
> +	.desc_offset = sizeof(struct kvm_stats_header),
> +	.data_offset = sizeof(struct kvm_stats_header) +
> +		sizeof(kvm_vm_stats_desc),
> +};
> +
> +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
> +	STATS_DESC_COUNTER("exit_userspace"),
> +	STATS_DESC_COUNTER("exit_null"),
> +	STATS_DESC_COUNTER("exit_external_request"),
> +	STATS_DESC_COUNTER("exit_io_request"),
> +	STATS_DESC_COUNTER("exit_external_interrupt"),
> +	STATS_DESC_COUNTER("exit_stop_request"),
> +	STATS_DESC_COUNTER("exit_validity"),
> +	STATS_DESC_COUNTER("exit_instruction"),
> +	STATS_DESC_COUNTER("exit_pei"),
> +	STATS_DESC_COUNTER("halt_no_poll_steal"),
> +	STATS_DESC_COUNTER("instruction_lctl"),
> +	STATS_DESC_COUNTER("instruction_lctlg"),
> +	STATS_DESC_COUNTER("instruction_stctl"),
> +	STATS_DESC_COUNTER("instruction_stctg"),
> +	STATS_DESC_COUNTER("exit_program_interruption"),
> +	STATS_DESC_COUNTER("exit_instr_and_program"),
> +	STATS_DESC_COUNTER("exit_operation_exception"),
> +	STATS_DESC_COUNTER("deliver_ckc"),
> +	STATS_DESC_COUNTER("deliver_cputm"),
> +	STATS_DESC_COUNTER("deliver_external_call"),
> +	STATS_DESC_COUNTER("deliver_emergency_signal"),
> +	STATS_DESC_COUNTER("deliver_service_signal"),
> +	STATS_DESC_COUNTER("deliver_virtio"),
> +	STATS_DESC_COUNTER("deliver_stop_signal"),
> +	STATS_DESC_COUNTER("deliver_prefix_signal"),
> +	STATS_DESC_COUNTER("deliver_restart_signal"),
> +	STATS_DESC_COUNTER("deliver_program"),
> +	STATS_DESC_COUNTER("deliver_io"),
> +	STATS_DESC_COUNTER("deliver_machine_check"),
> +	STATS_DESC_COUNTER("exit_wait_state"),
> +	STATS_DESC_COUNTER("inject_ckc"),
> +	STATS_DESC_COUNTER("inject_cputm"),
> +	STATS_DESC_COUNTER("inject_external_call"),
> +	STATS_DESC_COUNTER("inject_emergency_signal"),
> +	STATS_DESC_COUNTER("inject_mchk"),
> +	STATS_DESC_COUNTER("inject_pfault_init"),
> +	STATS_DESC_COUNTER("inject_program"),
> +	STATS_DESC_COUNTER("inject_restart"),
> +	STATS_DESC_COUNTER("inject_set_prefix"),
> +	STATS_DESC_COUNTER("inject_stop_signal"),
> +	STATS_DESC_COUNTER("instruction_epsw"),
> +	STATS_DESC_COUNTER("instruction_gs"),
> +	STATS_DESC_COUNTER("instruction_io_other"),
> +	STATS_DESC_COUNTER("instruction_lpsw"),
> +	STATS_DESC_COUNTER("instruction_lpswe"),
> +	STATS_DESC_COUNTER("instruction_pfmf"),
> +	STATS_DESC_COUNTER("instruction_ptff"),
> +	STATS_DESC_COUNTER("instruction_sck"),
> +	STATS_DESC_COUNTER("instruction_sckpf"),
> +	STATS_DESC_COUNTER("instruction_stidp"),
> +	STATS_DESC_COUNTER("instruction_spx"),
> +	STATS_DESC_COUNTER("instruction_stpx"),
> +	STATS_DESC_COUNTER("instruction_stap"),
> +	STATS_DESC_COUNTER("instruction_iske"),
> +	STATS_DESC_COUNTER("instruction_ri"),
> +	STATS_DESC_COUNTER("instruction_rrbe"),
> +	STATS_DESC_COUNTER("instruction_sske"),
> +	STATS_DESC_COUNTER("instruction_ipte_interlock"),
> +	STATS_DESC_COUNTER("instruction_stsi"),
> +	STATS_DESC_COUNTER("instruction_stfl"),
> +	STATS_DESC_COUNTER("instruction_tb"),
> +	STATS_DESC_COUNTER("instruction_tpi"),
> +	STATS_DESC_COUNTER("instruction_tprot"),
> +	STATS_DESC_COUNTER("instruction_tsch"),
> +	STATS_DESC_COUNTER("instruction_sie"),
> +	STATS_DESC_COUNTER("instruction_essa"),
> +	STATS_DESC_COUNTER("instruction_sthyi"),
> +	STATS_DESC_COUNTER("instruction_sigp_sense"),
> +	STATS_DESC_COUNTER("instruction_sigp_sense_running"),
> +	STATS_DESC_COUNTER("instruction_sigp_external_call"),
> +	STATS_DESC_COUNTER("instruction_sigp_emergency"),
> +	STATS_DESC_COUNTER("instruction_sigp_cond_emergency"),
> +	STATS_DESC_COUNTER("instruction_sigp_start"),
> +	STATS_DESC_COUNTER("instruction_sigp_stop"),
> +	STATS_DESC_COUNTER("instruction_sigp_stop_store_status"),
> +	STATS_DESC_COUNTER("instruction_sigp_store_status"),
> +	STATS_DESC_COUNTER("instruction_sigp_store_adtl_status"),
> +	STATS_DESC_COUNTER("instruction_sigp_arch"),
> +	STATS_DESC_COUNTER("instruction_sigp_prefix"),
> +	STATS_DESC_COUNTER("instruction_sigp_restart"),
> +	STATS_DESC_COUNTER("instruction_sigp_init_cpu_reset"),
> +	STATS_DESC_COUNTER("instruction_sigp_cpu_reset"),
> +	STATS_DESC_COUNTER("instruction_sigp_unknown"),
> +	STATS_DESC_COUNTER("diagnose_10"),
> +	STATS_DESC_COUNTER("diagnose_44"),
> +	STATS_DESC_COUNTER("diagnose_9c"),
> +	STATS_DESC_COUNTER("diagnose_9c_ignored"),
> +	STATS_DESC_COUNTER("diagnose_258"),
> +	STATS_DESC_COUNTER("diagnose_308"),
> +	STATS_DESC_COUNTER("diagnose_500"),
> +	STATS_DESC_COUNTER("diagnose_other"),
> +	STATS_DESC_COUNTER("pfault_sync"));
> +
> +struct _kvm_stats_header kvm_vcpu_stats_header = {
> +	.name_size = KVM_STATS_NAME_LEN,
> +	.count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> +	.desc_offset = sizeof(struct kvm_stats_header),
> +	.data_offset = sizeof(struct kvm_stats_header) +
> +		sizeof(kvm_vcpu_stats_desc),
> +};
> +
>   struct kvm_stats_debugfs_item debugfs_entries[] = {
>   	VCPU_STAT("userspace_handled", exit_userspace),
>   	VCPU_STAT("exit_null", exit_null),
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index 9a93d80caff6..84880687c199 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -214,6 +214,59 @@ EXPORT_SYMBOL_GPL(host_xss);
>   u64 __read_mostly supported_xss;
>   EXPORT_SYMBOL_GPL(supported_xss);
>   
> +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(
> +	STATS_DESC_COUNTER("mmu_shadow_zapped"),
> +	STATS_DESC_COUNTER("mmu_pte_write"),
> +	STATS_DESC_COUNTER("mmu_pde_zapped"),
> +	STATS_DESC_COUNTER("mmu_flooded"),
> +	STATS_DESC_COUNTER("mmu_recycled"),
> +	STATS_DESC_COUNTER("mmu_cache_miss"),
> +	STATS_DESC_ICOUNTER("mmu_unsync"),
> +	STATS_DESC_ICOUNTER("largepages"),
> +	STATS_DESC_ICOUNTER("nx_largepages_splits"),
> +	STATS_DESC_ICOUNTER("max_mmu_page_hash_collisions"));
> +
> +struct _kvm_stats_header kvm_vm_stats_header = {
> +	.name_size = KVM_STATS_NAME_LEN,
> +	.count = ARRAY_SIZE(kvm_vm_stats_desc),
> +	.desc_offset = sizeof(struct kvm_stats_header),
> +	.data_offset = sizeof(struct kvm_stats_header) +
> +		sizeof(kvm_vm_stats_desc),
> +};
> +
> +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
> +	STATS_DESC_COUNTER("pf_fixed"),
> +	STATS_DESC_COUNTER("pf_guest"),
> +	STATS_DESC_COUNTER("tlb_flush"),
> +	STATS_DESC_COUNTER("invlpg"),
> +	STATS_DESC_COUNTER("exits"),
> +	STATS_DESC_COUNTER("io_exits"),
> +	STATS_DESC_COUNTER("mmio_exits"),
> +	STATS_DESC_COUNTER("signal_exits"),
> +	STATS_DESC_COUNTER("irq_window_exits"),
> +	STATS_DESC_COUNTER("nmi_window_exits"),
> +	STATS_DESC_COUNTER("l1d_flush"),
> +	STATS_DESC_COUNTER("halt_exits"),
> +	STATS_DESC_COUNTER("request_irq_exits"),
> +	STATS_DESC_COUNTER("irq_exits"),
> +	STATS_DESC_COUNTER("host_state_reload"),
> +	STATS_DESC_COUNTER("fpu_reload"),
> +	STATS_DESC_COUNTER("insn_emulation"),
> +	STATS_DESC_COUNTER("insn_emulation_fail"),
> +	STATS_DESC_COUNTER("hypercalls"),
> +	STATS_DESC_COUNTER("irq_injections"),
> +	STATS_DESC_COUNTER("nmi_injections"),
> +	STATS_DESC_COUNTER("req_event"),
> +	STATS_DESC_COUNTER("nested_run"));
> +
> +struct _kvm_stats_header kvm_vcpu_stats_header = {
> +	.name_size = KVM_STATS_NAME_LEN,
> +	.count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> +	.desc_offset = sizeof(struct kvm_stats_header),
> +	.data_offset = sizeof(struct kvm_stats_header) +
> +		sizeof(kvm_vcpu_stats_desc),
> +};
> +
>   struct kvm_stats_debugfs_item debugfs_entries[] = {
>   	VCPU_STAT("pf_fixed", pf_fixed),
>   	VCPU_STAT("pf_guest", pf_guest),
> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> index 97700e41db3b..c0a8e6ddc745 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -1240,6 +1240,19 @@ struct kvm_stats_debugfs_item {
>   	int mode;
>   };
>   
> +struct _kvm_stats_header {
> +	__u32 name_size;
> +	__u32 count;
> +	__u32 desc_offset;
> +	__u32 data_offset;
> +};
> +
> +#define KVM_STATS_NAME_LEN	48
> +struct _kvm_stats_desc {
> +	struct kvm_stats_desc desc;
> +	char name[KVM_STATS_NAME_LEN];
> +};
> +
>   #define KVM_DBGFS_GET_MODE(dbgfs_item)                                         \
>   	((dbgfs_item)->mode ? (dbgfs_item)->mode : 0644)
>   
> @@ -1253,8 +1266,127 @@ struct kvm_stats_debugfs_item {
>   	{ n, offsetof(struct kvm_vcpu, stat.common.x),			       \
>   	  KVM_STAT_VCPU, ## __VA_ARGS__ }
>   
> +#define STATS_DESC(stat, type, unit, scale, exp)			       \
> +	{								       \
> +		{							       \
> +			.flags = type | unit | scale,			       \
> +			.exponent = exp,				       \
> +			.size = 1					       \
> +		},							       \
> +		.name = stat,						       \
> +	}
> +#define STATS_DESC_CUMULATIVE(name, unit, scale, exponent)		       \
> +	STATS_DESC(name, KVM_STATS_TYPE_CUMULATIVE, unit, scale, exponent)
> +#define STATS_DESC_INSTANT(name, unit, scale, exponent)			       \
> +	STATS_DESC(name, KVM_STATS_TYPE_INSTANT, unit, scale, exponent)
> +
> +/* Cumulative counter */
> +#define STATS_DESC_COUNTER(name)					       \
> +	STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_NONE,		       \
> +		KVM_STATS_BASE_POW10, 0)
> +/* Instantaneous counter */
> +#define STATS_DESC_ICOUNTER(name)					       \
> +	STATS_DESC_INSTANT(name, KVM_STATS_UNIT_NONE,			       \
> +		KVM_STATS_BASE_POW10, 0)
> +
> +/* Cumulative clock cycles */
> +#define STATS_DESC_CYCLE(name)						       \
> +	STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_CYCLES,		       \
> +		KVM_STATS_BASE_POW10, 0)
> +/* Instantaneous clock cycles */
> +#define STATS_DESC_ICYCLE(name)						       \
> +	STATS_DESC_INSTANT(name, KVM_STATS_UNIT_CYCLES,			       \
> +		KVM_STATS_BASE_POW10, 0)
> +
> +/* Cumulative memory size in Byte */
> +#define STATS_DESC_SIZE_BYTE(name)					       \
> +	STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES,		       \
> +		KVM_STATS_BASE_POW2, 0)
> +/* Cumulative memory size in KiByte */
> +#define STATS_DESC_SIZE_KBYTE(name)					       \
> +	STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES,		       \
> +		KVM_STATS_BASE_POW2, 10)
> +/* Cumulative memory size in MiByte */
> +#define STATS_DESC_SIZE_MBYTE(name)					       \
> +	STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES,		       \
> +		KVM_STATS_BASE_POW2, 20)
> +/* Cumulative memory size in GiByte */
> +#define STATS_DESC_SIZE_GBYTE(name)					       \
> +	STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES,		       \
> +		KVM_STATS_BASE_POW2, 30)
> +
> +/* Instantaneous memory size in Byte */
> +#define STATS_DESC_ISIZE_BYTE(name)					       \
> +	STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES,			       \
> +		KVM_STATS_BASE_POW2, 0)
> +/* Instantaneous memory size in KiByte */
> +#define STATS_DESC_ISIZE_KBYTE(name)					       \
> +	STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES,			       \
> +		KVM_STATS_BASE_POW2, 10)
> +/* Instantaneous memory size in MiByte */
> +#define STATS_DESC_ISIZE_MBYTE(name)					       \
> +	STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES,			       \
> +		KVM_STATS_BASE_POW2, 20)
> +/* Instantaneous memory size in GiByte */
> +#define STATS_DESC_ISIZE_GBYTE(name)					       \
> +	STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES,			       \
> +		KVM_STATS_BASE_POW2, 30)
> +
> +/* Cumulative time in second */
> +#define STATS_DESC_TIME_SEC(name)					       \
> +	STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS,		       \
> +		KVM_STATS_BASE_POW10, 0)
> +/* Cumulative time in millisecond */
> +#define STATS_DESC_TIME_MSEC(name)					       \
> +	STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS,		       \
> +		KVM_STATS_BASE_POW10, -3)
> +/* Cumulative time in microsecond */
> +#define STATS_DESC_TIME_USEC(name)					       \
> +	STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS,		       \
> +		KVM_STATS_BASE_POW10, -6)
> +/* Cumulative time in nanosecond */
> +#define STATS_DESC_TIME_NSEC(name)					       \
> +	STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS,		       \
> +		KVM_STATS_BASE_POW10, -9)
> +
> +/* Instantaneous time in second */
> +#define STATS_DESC_ITIME_SEC(name)					       \
> +	STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS,		       \
> +		KVM_STATS_BASE_POW10, 0)
> +/* Instantaneous time in millisecond */
> +#define STATS_DESC_ITIME_MSEC(name)					       \
> +	STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS,		       \
> +		KVM_STATS_BASE_POW10, -3)
> +/* Instantaneous time in microsecond */
> +#define STATS_DESC_ITIME_USEC(name)					       \
> +	STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS,		       \
> +		KVM_STATS_BASE_POW10, -6)
> +/* Instantaneous time in nanosecond */
> +#define STATS_DESC_ITIME_NSEC(name)					       \
> +	STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS,		       \
> +		KVM_STATS_BASE_POW10, -9)
> +
> +#define DEFINE_VM_STATS_DESC(...) {					       \
> +	STATS_DESC_COUNTER("remote_tlb_flush"),				       \
> +	## __VA_ARGS__							       \
> +}
> +
> +#define DEFINE_VCPU_STATS_DESC(...) {					       \
> +	STATS_DESC_COUNTER("halt_successful_poll"),			       \
> +	STATS_DESC_COUNTER("halt_attempted_poll"),			       \
> +	STATS_DESC_COUNTER("halt_poll_invalid"),			       \
> +	STATS_DESC_COUNTER("halt_wakeup"),				       \
> +	STATS_DESC_TIME_NSEC("halt_poll_success_ns"),			       \
> +	STATS_DESC_TIME_NSEC("halt_poll_fail_ns"),			       \
> +	## __VA_ARGS__							       \
> +}
> +
>   extern struct kvm_stats_debugfs_item debugfs_entries[];
>   extern struct dentry *kvm_debugfs_dir;
> +extern struct _kvm_stats_header kvm_vm_stats_header;
> +extern struct _kvm_stats_header kvm_vcpu_stats_header;
> +extern struct _kvm_stats_desc kvm_vm_stats_desc[];
> +extern struct _kvm_stats_desc kvm_vcpu_stats_desc[];
>   
>   #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
>   static inline int mmu_notifier_retry(struct kvm *kvm, unsigned long mmu_seq)
> diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
> index 3fd9a7e9d90c..82db825c392c 100644
> --- a/include/uapi/linux/kvm.h
> +++ b/include/uapi/linux/kvm.h
> @@ -1082,6 +1082,7 @@ struct kvm_ppc_resize_hpt {
>   #define KVM_CAP_SGX_ATTRIBUTE 196
>   #define KVM_CAP_VM_COPY_ENC_CONTEXT_FROM 197
>   #define KVM_CAP_PTP_KVM 198
> +#define KVM_CAP_STATS_BINARY_FD 199
>   
>   #ifdef KVM_CAP_IRQ_ROUTING
>   
> @@ -1898,4 +1899,53 @@ struct kvm_dirty_gfn {
>   #define KVM_BUS_LOCK_DETECTION_OFF             (1 << 0)
>   #define KVM_BUS_LOCK_DETECTION_EXIT            (1 << 1)
>   
> +#define KVM_STATS_ID_MAXLEN		64
> +
> +struct kvm_stats_header {
> +	char id[KVM_STATS_ID_MAXLEN];
> +	__u32 name_size;
> +	__u32 count;
> +	__u32 desc_offset;
> +	__u32 data_offset;
> +};
> +
> +#define KVM_STATS_TYPE_SHIFT		0
> +#define KVM_STATS_TYPE_MASK		(0xF << KVM_STATS_TYPE_SHIFT)
> +#define KVM_STATS_TYPE_CUMULATIVE	(0x0 << KVM_STATS_TYPE_SHIFT)
> +#define KVM_STATS_TYPE_INSTANT		(0x1 << KVM_STATS_TYPE_SHIFT)
> +#define KVM_STATS_TYPE_MAX		KVM_STATS_TYPE_INSTANT
> +
> +#define KVM_STATS_UNIT_SHIFT		4
> +#define KVM_STATS_UNIT_MASK		(0xF << KVM_STATS_UNIT_SHIFT)
> +#define KVM_STATS_UNIT_NONE		(0x0 << KVM_STATS_UNIT_SHIFT)
> +#define KVM_STATS_UNIT_BYTES		(0x1 << KVM_STATS_UNIT_SHIFT)
> +#define KVM_STATS_UNIT_SECONDS		(0x2 << KVM_STATS_UNIT_SHIFT)
> +#define KVM_STATS_UNIT_CYCLES		(0x3 << KVM_STATS_UNIT_SHIFT)
> +#define KVM_STATS_UNIT_MAX		KVM_STATS_UNIT_CYCLES
> +
> +#define KVM_STATS_BASE_SHIFT		8
> +#define KVM_STATS_BASE_MASK		(0xF << KVM_STATS_BASE_SHIFT)
> +#define KVM_STATS_BASE_POW10		(0x0 << KVM_STATS_BASE_SHIFT)
> +#define KVM_STATS_BASE_POW2		(0x1 << KVM_STATS_BASE_SHIFT)
> +#define KVM_STATS_BASE_MAX		KVM_STATS_BASE_POW2
> +
> +struct kvm_stats_desc {
> +	__u32 flags;
> +	__s16 exponent;
> +	__u16 size;
> +	__u32 unused1;
> +	__u32 unused2;
> +	char name[0];
> +};
> +
> +struct kvm_vm_stats_data {
> +	unsigned long value[0];
> +};
> +
> +struct kvm_vcpu_stats_data {
> +	__u64 value[0];
> +};
> +
> +#define KVM_STATS_GETFD  _IOR(KVMIO,  0xcc, struct kvm_stats_header)
> +
>   #endif /* __LINUX_KVM_H */
> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> index 34a4cf265297..9e20e2ff78b4 100644
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -3409,6 +3409,120 @@ static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
>   	return 0;
>   }
>   
> +static ssize_t kvm_stats_read(char *id, struct _kvm_stats_header *header,
> +		struct _kvm_stats_desc *desc, void *stats, size_t size_stats,
> +		char __user *user_buffer, size_t size, loff_t *offset)
> +{
> +	ssize_t copylen, len, remain = size;
> +	size_t size_header, size_desc;
> +	loff_t pos = *offset;
> +	char __user *dest = user_buffer;
> +	void *src;
> +
> +	size_header = sizeof(*header);
> +	size_desc = header->count * sizeof(*desc);
> +
> +	len = KVM_STATS_ID_MAXLEN + size_header + size_desc + size_stats - pos;
> +	len = min(len, remain);
> +	if (len <= 0)
> +		return 0;
> +	remain = len;
> +
> +	/* Copy kvm stats header id string */
> +	copylen = KVM_STATS_ID_MAXLEN - pos;
> +	copylen = min(copylen, remain);
> +	if (copylen > 0) {
> +		src = id + pos;
> +		if (copy_to_user(dest, src, copylen))
> +			return -EFAULT;
> +		remain -= copylen;
> +		pos += copylen;
> +		dest += copylen;
> +	}
> +	/* Copy kvm stats header */
> +	copylen = KVM_STATS_ID_MAXLEN + size_header - pos;
> +	copylen = min(copylen, remain);
> +	if (copylen > 0) {
> +		src = header + pos - KVM_STATS_ID_MAXLEN;
> +		if (copy_to_user(dest, src, copylen))
> +			return -EFAULT;
> +		remain -= copylen;
> +		pos += copylen;
> +		dest += copylen;
> +	}
> +	/* Copy kvm stats descriptors */
> +	copylen = header->desc_offset + size_desc - pos;
> +	copylen = min(copylen, remain);
> +	if (copylen > 0) {
> +		src = desc + pos - header->desc_offset;
> +		if (copy_to_user(dest, src, copylen))
> +			return -EFAULT;
> +		remain -= copylen;
> +		pos += copylen;
> +		dest += copylen;
> +	}
> +	/* Copy kvm stats values */
> +	copylen = header->data_offset + size_stats - pos;
> +	copylen = min(copylen, remain);
> +	if (copylen > 0) {
> +		src = stats + pos - header->data_offset;
> +		if (copy_to_user(dest, src, copylen))
> +			return -EFAULT;
> +		remain -= copylen;
> +		pos += copylen;
> +		dest += copylen;
> +	}
> +


Is it possible to re-use the 'if' portion either via a separate function 
? For example,

static int copy_data(void *src)

{
         if (copy_to_user(dest, src, copylen))
             return -EFAULT;
         remain -= copylen;
         pos += copylen;
         dest += copylen;
         return 0;

}

and then calling it as,

         if (copylen > 0)

             copy_data(stats + pos - header->data_offset);

> +	*offset = pos;
> +	return len;
> +}
> +
> +static ssize_t kvm_vcpu_stats_read(struct file *file, char __user *user_buffer,
> +			      size_t size, loff_t *offset)
> +{
> +	char id[KVM_STATS_ID_MAXLEN];
> +	struct kvm_vcpu *vcpu = file->private_data;
> +
> +	snprintf(id, sizeof(id), "kvm-%d/vcpu-%d",
> +			task_pid_nr(current), vcpu->vcpu_id);
> +	return kvm_stats_read(id, &kvm_vcpu_stats_header,
> +			&kvm_vcpu_stats_desc[0], &vcpu->stat,
> +			sizeof(vcpu->stat), user_buffer, size, offset);
> +}
> +
> +static const struct file_operations kvm_vcpu_stats_fops = {
> +	.read = kvm_vcpu_stats_read,
> +	.llseek = noop_llseek,
> +};
> +
> +static int kvm_vcpu_ioctl_get_statsfd(struct kvm_vcpu *vcpu)
> +{
> +	int error, fd;
> +	struct file *file;
> +	char name[15 + ITOA_MAX_LEN + 1];
> +
> +	snprintf(name, sizeof(name), "kvm-vcpu-stats:%d", vcpu->vcpu_id);
> +
> +	error = get_unused_fd_flags(O_CLOEXEC);
> +	if (error < 0)
> +		return error;
> +	fd = error;
> +
> +	file = anon_inode_getfile(name, &kvm_vcpu_stats_fops, vcpu, O_RDONLY);
> +	if (IS_ERR(file)) {
> +		error = PTR_ERR(file);
> +		goto err_put_unused_fd;
> +	}
> +	file->f_mode |= FMODE_PREAD;
> +	fd_install(fd, file);
> +
> +	return fd;
> +
> +err_put_unused_fd:
> +	put_unused_fd(fd);
> +	return error;
> +}
> +
>   static long kvm_vcpu_ioctl(struct file *filp,
>   			   unsigned int ioctl, unsigned long arg)
>   {
> @@ -3606,6 +3720,10 @@ static long kvm_vcpu_ioctl(struct file *filp,
>   		r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
>   		break;
>   	}
> +	case KVM_STATS_GETFD: {
> +		r = kvm_vcpu_ioctl_get_statsfd(vcpu);
> +		break;
> +	}
>   	default:
>   		r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
>   	}
> @@ -3864,6 +3982,8 @@ static long kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg)
>   #else
>   		return 0;
>   #endif
> +	case KVM_CAP_STATS_BINARY_FD:
> +		return 1;
>   	default:
>   		break;
>   	}
> @@ -3967,6 +4087,48 @@ static int kvm_vm_ioctl_enable_cap_generic(struct kvm *kvm,
>   	}
>   }
>   
> +static ssize_t kvm_vm_stats_read(struct file *file, char __user *user_buffer,
> +			      size_t size, loff_t *offset)
> +{
> +	char id[KVM_STATS_ID_MAXLEN];
> +	struct kvm *kvm = file->private_data;
> +
> +	snprintf(id, sizeof(id), "kvm-%d", task_pid_nr(current));
> +	return kvm_stats_read(id, &kvm_vm_stats_header, &kvm_vm_stats_desc[0],
> +		&kvm->stat, sizeof(kvm->stat), user_buffer, size, offset);
> +}
> +
> +static const struct file_operations kvm_vm_stats_fops = {
> +	.read = kvm_vm_stats_read,
> +	.llseek = noop_llseek,
> +};
> +
> +static int kvm_vm_ioctl_get_statsfd(struct kvm *kvm)
> +{
> +	int error, fd;
> +	struct file *file;
> +
> +	error = get_unused_fd_flags(O_CLOEXEC);
> +	if (error < 0)
> +		return error;
> +	fd = error;


Why not just do,

             fd = get_unused_fd_flags(O_CLOEXEC);
             if (fd < 0)
                     return fd;

?

> +
> +	file = anon_inode_getfile("kvm-vm-stats",
> +			&kvm_vm_stats_fops, kvm, O_RDONLY);
> +	if (IS_ERR(file)) {
> +		error = PTR_ERR(file);
> +		goto err_put_unused_fd;


Here, we can do,

                if (IS_ERR(file)) {

                     put_unused_fd(fd);

                     return (PTR_ERR(file));

                 }

and won't need a goto statement.

Same comment for kvm_vcpu_ioctl_get_statsfd().

> +	}
> +	file->f_mode |= FMODE_PREAD;
> +	fd_install(fd, file);
> +
> +	return fd;
> +
> +err_put_unused_fd:
> +	put_unused_fd(fd);
> +	return error;
> +}
> +
>   static long kvm_vm_ioctl(struct file *filp,
>   			   unsigned int ioctl, unsigned long arg)
>   {
> @@ -4149,6 +4311,9 @@ static long kvm_vm_ioctl(struct file *filp,
>   	case KVM_RESET_DIRTY_RINGS:
>   		r = kvm_vm_ioctl_reset_dirty_pages(kvm);
>   		break;
> +	case KVM_STATS_GETFD:


This should be named KVM_GET_STATS_FD.  For example, we have names like 
KVM_GET_DIRTY_LOG etc.

Same comment for KVM_STATS_GETFD.

> +		r = kvm_vm_ioctl_get_statsfd(kvm);


It's probably more readable if we call it kvm_vm_ioctl_get_stats_fd().

> +		break;
>   	default:
>   		r = kvm_arch_vm_ioctl(filp, ioctl, arg);
>   	}

Re: [PATCH v6 2/4] KVM: stats: Add fd-based API to read binary stats data

[Krish Sadhukhan]

On 5/24/21 8:18 AM, Jing Zhang wrote:
> Provides a file descriptor per VM to read VM stats info/data.
> Provides a file descriptor per vCPU to read vCPU stats info/data.
>
> Reviewed-by: David Matlack<dmatlack@google.com>
> Reviewed-by: Ricardo Koller<ricarkol@google.com>
> Signed-off-by: Jing Zhang<jingzhangos@google.com>
> ---
>   arch/arm64/kvm/guest.c    |  26 ++++++
>   arch/mips/kvm/mips.c      |  52 ++++++++++++
>   arch/powerpc/kvm/book3s.c |  52 ++++++++++++
>   arch/powerpc/kvm/booke.c  |  45 +++++++++++
>   arch/s390/kvm/kvm-s390.c  | 117 +++++++++++++++++++++++++++
>   arch/x86/kvm/x86.c        |  53 ++++++++++++
>   include/linux/kvm_host.h  | 132 ++++++++++++++++++++++++++++++
>   include/uapi/linux/kvm.h  |  50 ++++++++++++
>   virt/kvm/kvm_main.c       | 165 ++++++++++++++++++++++++++++++++++++++
>   9 files changed, 692 insertions(+)
>
> diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
> index 0e41331b0911..1cc1d83630ac 100644
> --- a/arch/arm64/kvm/guest.c
> +++ b/arch/arm64/kvm/guest.c
> @@ -28,6 +28,32 @@
>   
>   #include "trace.h"
>   
> +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC();
> +
> +struct _kvm_stats_header kvm_vm_stats_header = {
> +	.name_size = KVM_STATS_NAME_LEN,
> +	.count = ARRAY_SIZE(kvm_vm_stats_desc),
> +	.desc_offset = sizeof(struct kvm_stats_header),
> +	.data_offset = sizeof(struct kvm_stats_header) +
> +		sizeof(kvm_vm_stats_desc),
> +};
> +
> +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
> +	STATS_DESC_COUNTER("hvc_exit_stat"),
> +	STATS_DESC_COUNTER("wfe_exit_stat"),
> +	STATS_DESC_COUNTER("wfi_exit_stat"),
> +	STATS_DESC_COUNTER("mmio_exit_user"),
> +	STATS_DESC_COUNTER("mmio_exit_kernel"),
> +	STATS_DESC_COUNTER("exits"));
> +
> +struct _kvm_stats_header kvm_vcpu_stats_header = {
> +	.name_size = KVM_STATS_NAME_LEN,
> +	.count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> +	.desc_offset = sizeof(struct kvm_stats_header),
> +	.data_offset = sizeof(struct kvm_stats_header) +
> +		sizeof(kvm_vcpu_stats_desc),
> +};
> +
>   struct kvm_stats_debugfs_item debugfs_entries[] = {
>   	VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
>   	VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll), diff --git a/arch/mips/kvm/mips.c 
> b/arch/mips/kvm/mips.c index f4fc60c05e9c..f17a65743ccd 100644 --- 
> a/arch/mips/kvm/mips.c +++ b/arch/mips/kvm/mips.c @@ -38,6 +38,58 @@ 
> #define VECTORSPACING 0x100 /* for EI/VI mode */ #endif +struct 
> _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(); + 
> +struct _kvm_stats_header kvm_vm_stats_header = { + .name_size = 
> KVM_STATS_NAME_LEN, + .count = ARRAY_SIZE(kvm_vm_stats_desc), + 
> .desc_offset = sizeof(struct kvm_stats_header), + .data_offset = 
> sizeof(struct kvm_stats_header) + + sizeof(kvm_vm_stats_desc), +}; + 
> +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = 
> DEFINE_VCPU_STATS_DESC( + STATS_DESC_COUNTER("wait_exits"),
> +	STATS_DESC_COUNTER("cache_exits"),
> +	STATS_DESC_COUNTER("signal_exits"),
> +	STATS_DESC_COUNTER("int_exits"),
> +	STATS_DESC_COUNTER("cop_unusable_exits"),
> +	STATS_DESC_COUNTER("tlbmod_exits"),
> +	STATS_DESC_COUNTER("tlbmiss_ld_exits"),
> +	STATS_DESC_COUNTER("tlbmiss_st_exits"),
> +	STATS_DESC_COUNTER("addrerr_st_exits"),
> +	STATS_DESC_COUNTER("addrerr_ld_exits"),
> +	STATS_DESC_COUNTER("syscall_exits"),
> +	STATS_DESC_COUNTER("resvd_inst_exits"),
> +	STATS_DESC_COUNTER("break_inst_exits"),
> +	STATS_DESC_COUNTER("trap_inst_exits"),
> +	STATS_DESC_COUNTER("msa_fpe_exits"),
> +	STATS_DESC_COUNTER("fpe_exits"),
> +	STATS_DESC_COUNTER("msa_disabled_exits"),
> +	STATS_DESC_COUNTER("flush_dcache_exits"),
> +#ifdef CONFIG_KVM_MIPS_VZ
> +	STATS_DESC_COUNTER("vz_gpsi_exits"),
> +	STATS_DESC_COUNTER("vz_gsfc_exits"),
> +	STATS_DESC_COUNTER("vz_hc_exits"),
> +	STATS_DESC_COUNTER("vz_grr_exits"),
> +	STATS_DESC_COUNTER("vz_gva_exits"),
> +	STATS_DESC_COUNTER("vz_ghfc_exits"),
> +	STATS_DESC_COUNTER("vz_gpa_exits"),
> +	STATS_DESC_COUNTER("vz_resvd_exits"),
> +#ifdef CONFIG_CPU_LOONGSON64
> +	STATS_DESC_COUNTER("vz_cpucfg_exits"),
> +#endif
> +#endif
> +	);
> +
> +struct _kvm_stats_header kvm_vcpu_stats_header = {
> +	.name_size = KVM_STATS_NAME_LEN,
> +	.count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> +	.desc_offset = sizeof(struct kvm_stats_header),
> +	.data_offset = sizeof(struct kvm_stats_header) +
> +		sizeof(kvm_vcpu_stats_desc),
> +};
> +
>   struct kvm_stats_debugfs_item debugfs_entries[] = {
>   	VCPU_STAT("wait", wait_exits),
>   	VCPU_STAT("cache", cache_exits),
> diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
> index bd3a10e1fdaf..5e8ee0d39ef9 100644
> --- a/arch/powerpc/kvm/book3s.c
> +++ b/arch/powerpc/kvm/book3s.c
> @@ -38,6 +38,58 @@
>   
>   /* #define EXIT_DEBUG */
>   
> +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(
> +	STATS_DESC_ICOUNTER("num_2M_pages"),
> +	STATS_DESC_ICOUNTER("num_1G_pages"));
> +
> +struct _kvm_stats_header kvm_vm_stats_header = {
> +	.name_size = KVM_STATS_NAME_LEN,
> +	.count = ARRAY_SIZE(kvm_vm_stats_desc),
> +	.desc_offset = sizeof(struct kvm_stats_header),
> +	.data_offset = sizeof(struct kvm_stats_header) +
> +		sizeof(kvm_vm_stats_desc),
> +};
> +
> +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
> +	STATS_DESC_COUNTER("sum_exits"),
> +	STATS_DESC_COUNTER("mmio_exits"),
> +	STATS_DESC_COUNTER("signal_exits"),
> +	STATS_DESC_COUNTER("light_exits"),
> +	STATS_DESC_COUNTER("itlb_real_miss_exits"),
> +	STATS_DESC_COUNTER("itlb_virt_miss_exits"),
> +	STATS_DESC_COUNTER("dtlb_real_miss_exits"),
> +	STATS_DESC_COUNTER("dtlb_virt_miss_exits"),
> +	STATS_DESC_COUNTER("syscall_exits"),
> +	STATS_DESC_COUNTER("isi_exits"),
> +	STATS_DESC_COUNTER("dsi_exits"),
> +	STATS_DESC_COUNTER("emulated_inst_exits"),
> +	STATS_DESC_COUNTER("dec_exits"),
> +	STATS_DESC_COUNTER("ext_intr_exits"),
> +	STATS_DESC_TIME_NSEC("halt_wait_ns"),
> +	STATS_DESC_COUNTER("halt_successful_wait"),
> +	STATS_DESC_COUNTER("dbell_exits"),
> +	STATS_DESC_COUNTER("gdbell_exits"),
> +	STATS_DESC_COUNTER("ld"),
> +	STATS_DESC_COUNTER("st"),
> +	STATS_DESC_COUNTER("pf_storage"),
> +	STATS_DESC_COUNTER("pf_instruc"),
> +	STATS_DESC_COUNTER("sp_storage"),
> +	STATS_DESC_COUNTER("sp_instruc"),
> +	STATS_DESC_COUNTER("queue_intr"),
> +	STATS_DESC_COUNTER("ld_slow"),
> +	STATS_DESC_COUNTER("st_slow"),
> +	STATS_DESC_COUNTER("pthru_all"),
> +	STATS_DESC_COUNTER("pthru_host"),
> +	STATS_DESC_COUNTER("pthru_bad_aff"));
> +
> +struct _kvm_stats_header kvm_vcpu_stats_header = {
> +	.name_size = KVM_STATS_NAME_LEN,
> +	.count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> +	.desc_offset = sizeof(struct kvm_stats_header),
> +	.data_offset = sizeof(struct kvm_stats_header) +
> +		sizeof(kvm_vcpu_stats_desc),
> +};
> +
>   struct kvm_stats_debugfs_item debugfs_entries[] = {
>   	VCPU_STAT("exits", sum_exits),
>   	VCPU_STAT("mmio", mmio_exits),
> diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
> index 07fdd7a1254a..86d221e9193e 100644
> --- a/arch/powerpc/kvm/booke.c
> +++ b/arch/powerpc/kvm/booke.c
> @@ -36,6 +36,51 @@
>   
>   unsigned long kvmppc_booke_handlers;
>   
> +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(
> +	STATS_DESC_ICOUNTER("num_2M_pages"),
> +	STATS_DESC_ICOUNTER("num_1G_pages"));
> +
> +struct _kvm_stats_header kvm_vm_stats_header = {
> +	.name_size = KVM_STATS_NAME_LEN,
> +	.count = ARRAY_SIZE(kvm_vm_stats_desc),
> +	.desc_offset = sizeof(struct kvm_stats_header),
> +	.data_offset = sizeof(struct kvm_stats_header) +
> +		sizeof(kvm_vm_stats_desc),
> +};
> +
> +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
> +	STATS_DESC_COUNTER("sum_exits"),
> +	STATS_DESC_COUNTER("mmio_exits"),
> +	STATS_DESC_COUNTER("signal_exits"),
> +	STATS_DESC_COUNTER("light_exits"),
> +	STATS_DESC_COUNTER("itlb_real_miss_exits"),
> +	STATS_DESC_COUNTER("itlb_virt_miss_exits"),
> +	STATS_DESC_COUNTER("dtlb_real_miss_exits"),
> +	STATS_DESC_COUNTER("dtlb_virt_miss_exits"),
> +	STATS_DESC_COUNTER("syscall_exits"),
> +	STATS_DESC_COUNTER("isi_exits"),
> +	STATS_DESC_COUNTER("dsi_exits"),
> +	STATS_DESC_COUNTER("emulated_inst_exits"),
> +	STATS_DESC_COUNTER("dec_exits"),
> +	STATS_DESC_COUNTER("ext_intr_exits"),
> +	STATS_DESC_TIME_NSEC("halt_wait_ns"),
> +	STATS_DESC_COUNTER("halt_successful_wait"),
> +	STATS_DESC_COUNTER("dbell_exits"),
> +	STATS_DESC_COUNTER("gdbell_exits"),
> +	STATS_DESC_COUNTER("ld"),
> +	STATS_DESC_COUNTER("st"),
> +	STATS_DESC_COUNTER("pthru_all"),
> +	STATS_DESC_COUNTER("pthru_host"),
> +	STATS_DESC_COUNTER("pthru_bad_aff"));
> +
> +struct _kvm_stats_header kvm_vcpu_stats_header = {
> +	.name_size = KVM_STATS_NAME_LEN,
> +	.count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> +	.desc_offset = sizeof(struct kvm_stats_header),
> +	.data_offset = sizeof(struct kvm_stats_header) +
> +		sizeof(kvm_vcpu_stats_desc),
> +};
> +
>   struct kvm_stats_debugfs_item debugfs_entries[] = {
>   	VCPU_STAT("mmio", mmio_exits),
>   	VCPU_STAT("sig", signal_exits),
> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> index d6bf3372bb10..003feee79fce 100644
> --- a/arch/s390/kvm/kvm-s390.c
> +++ b/arch/s390/kvm/kvm-s390.c
> @@ -58,6 +58,123 @@
>   #define VCPU_IRQS_MAX_BUF (sizeof(struct kvm_s390_irq) * \
>   			   (KVM_MAX_VCPUS + LOCAL_IRQS))
>   
> +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(
> +	STATS_DESC_COUNTER("inject_io"),
> +	STATS_DESC_COUNTER("inject_float_mchk"),
> +	STATS_DESC_COUNTER("inject_pfault_done"),
> +	STATS_DESC_COUNTER("inject_service_signal"),
> +	STATS_DESC_COUNTER("inject_virtio"));
> +
> +struct _kvm_stats_header kvm_vm_stats_header = {
> +	.name_size = KVM_STATS_NAME_LEN,
> +	.count = ARRAY_SIZE(kvm_vm_stats_desc),
> +	.desc_offset = sizeof(struct kvm_stats_header),
> +	.data_offset = sizeof(struct kvm_stats_header) +
> +		sizeof(kvm_vm_stats_desc),
> +};
> +
> +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
> +	STATS_DESC_COUNTER("exit_userspace"),
> +	STATS_DESC_COUNTER("exit_null"),
> +	STATS_DESC_COUNTER("exit_external_request"),
> +	STATS_DESC_COUNTER("exit_io_request"),
> +	STATS_DESC_COUNTER("exit_external_interrupt"),
> +	STATS_DESC_COUNTER("exit_stop_request"),
> +	STATS_DESC_COUNTER("exit_validity"),
> +	STATS_DESC_COUNTER("exit_instruction"),
> +	STATS_DESC_COUNTER("exit_pei"),
> +	STATS_DESC_COUNTER("halt_no_poll_steal"),
> +	STATS_DESC_COUNTER("instruction_lctl"),
> +	STATS_DESC_COUNTER("instruction_lctlg"),
> +	STATS_DESC_COUNTER("instruction_stctl"),
> +	STATS_DESC_COUNTER("instruction_stctg"),
> +	STATS_DESC_COUNTER("exit_program_interruption"),
> +	STATS_DESC_COUNTER("exit_instr_and_program"),
> +	STATS_DESC_COUNTER("exit_operation_exception"),
> +	STATS_DESC_COUNTER("deliver_ckc"),
> +	STATS_DESC_COUNTER("deliver_cputm"),
> +	STATS_DESC_COUNTER("deliver_external_call"),
> +	STATS_DESC_COUNTER("deliver_emergency_signal"),
> +	STATS_DESC_COUNTER("deliver_service_signal"),
> +	STATS_DESC_COUNTER("deliver_virtio"),
> +	STATS_DESC_COUNTER("deliver_stop_signal"),
> +	STATS_DESC_COUNTER("deliver_prefix_signal"),
> +	STATS_DESC_COUNTER("deliver_restart_signal"),
> +	STATS_DESC_COUNTER("deliver_program"),
> +	STATS_DESC_COUNTER("deliver_io"),
> +	STATS_DESC_COUNTER("deliver_machine_check"),
> +	STATS_DESC_COUNTER("exit_wait_state"),
> +	STATS_DESC_COUNTER("inject_ckc"),
> +	STATS_DESC_COUNTER("inject_cputm"),
> +	STATS_DESC_COUNTER("inject_external_call"),
> +	STATS_DESC_COUNTER("inject_emergency_signal"),
> +	STATS_DESC_COUNTER("inject_mchk"),
> +	STATS_DESC_COUNTER("inject_pfault_init"),
> +	STATS_DESC_COUNTER("inject_program"),
> +	STATS_DESC_COUNTER("inject_restart"),
> +	STATS_DESC_COUNTER("inject_set_prefix"),
> +	STATS_DESC_COUNTER("inject_stop_signal"),
> +	STATS_DESC_COUNTER("instruction_epsw"),
> +	STATS_DESC_COUNTER("instruction_gs"),
> +	STATS_DESC_COUNTER("instruction_io_other"),
> +	STATS_DESC_COUNTER("instruction_lpsw"),
> +	STATS_DESC_COUNTER("instruction_lpswe"),
> +	STATS_DESC_COUNTER("instruction_pfmf"),
> +	STATS_DESC_COUNTER("instruction_ptff"),
> +	STATS_DESC_COUNTER("instruction_sck"),
> +	STATS_DESC_COUNTER("instruction_sckpf"),
> +	STATS_DESC_COUNTER("instruction_stidp"),
> +	STATS_DESC_COUNTER("instruction_spx"),
> +	STATS_DESC_COUNTER("instruction_stpx"),
> +	STATS_DESC_COUNTER("instruction_stap"),
> +	STATS_DESC_COUNTER("instruction_iske"),
> +	STATS_DESC_COUNTER("instruction_ri"),
> +	STATS_DESC_COUNTER("instruction_rrbe"),
> +	STATS_DESC_COUNTER("instruction_sske"),
> +	STATS_DESC_COUNTER("instruction_ipte_interlock"),
> +	STATS_DESC_COUNTER("instruction_stsi"),
> +	STATS_DESC_COUNTER("instruction_stfl"),
> +	STATS_DESC_COUNTER("instruction_tb"),
> +	STATS_DESC_COUNTER("instruction_tpi"),
> +	STATS_DESC_COUNTER("instruction_tprot"),
> +	STATS_DESC_COUNTER("instruction_tsch"),
> +	STATS_DESC_COUNTER("instruction_sie"),
> +	STATS_DESC_COUNTER("instruction_essa"),
> +	STATS_DESC_COUNTER("instruction_sthyi"),
> +	STATS_DESC_COUNTER("instruction_sigp_sense"),
> +	STATS_DESC_COUNTER("instruction_sigp_sense_running"),
> +	STATS_DESC_COUNTER("instruction_sigp_external_call"),
> +	STATS_DESC_COUNTER("instruction_sigp_emergency"),
> +	STATS_DESC_COUNTER("instruction_sigp_cond_emergency"),
> +	STATS_DESC_COUNTER("instruction_sigp_start"),
> +	STATS_DESC_COUNTER("instruction_sigp_stop"),
> +	STATS_DESC_COUNTER("instruction_sigp_stop_store_status"),
> +	STATS_DESC_COUNTER("instruction_sigp_store_status"),
> +	STATS_DESC_COUNTER("instruction_sigp_store_adtl_status"),
> +	STATS_DESC_COUNTER("instruction_sigp_arch"),
> +	STATS_DESC_COUNTER("instruction_sigp_prefix"),
> +	STATS_DESC_COUNTER("instruction_sigp_restart"),
> +	STATS_DESC_COUNTER("instruction_sigp_init_cpu_reset"),
> +	STATS_DESC_COUNTER("instruction_sigp_cpu_reset"),
> +	STATS_DESC_COUNTER("instruction_sigp_unknown"),
> +	STATS_DESC_COUNTER("diagnose_10"),
> +	STATS_DESC_COUNTER("diagnose_44"),
> +	STATS_DESC_COUNTER("diagnose_9c"),
> +	STATS_DESC_COUNTER("diagnose_9c_ignored"),
> +	STATS_DESC_COUNTER("diagnose_258"),
> +	STATS_DESC_COUNTER("diagnose_308"),
> +	STATS_DESC_COUNTER("diagnose_500"),
> +	STATS_DESC_COUNTER("diagnose_other"),
> +	STATS_DESC_COUNTER("pfault_sync"));
> +
> +struct _kvm_stats_header kvm_vcpu_stats_header = {
> +	.name_size = KVM_STATS_NAME_LEN,
> +	.count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> +	.desc_offset = sizeof(struct kvm_stats_header),
> +	.data_offset = sizeof(struct kvm_stats_header) +
> +		sizeof(kvm_vcpu_stats_desc),
> +};
> +
>   struct kvm_stats_debugfs_item debugfs_entries[] = {
>   	VCPU_STAT("userspace_handled", exit_userspace),
>   	VCPU_STAT("exit_null", exit_null),
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index 9a93d80caff6..84880687c199 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -214,6 +214,59 @@ EXPORT_SYMBOL_GPL(host_xss);
>   u64 __read_mostly supported_xss;
>   EXPORT_SYMBOL_GPL(supported_xss);
>   
> +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(
> +	STATS_DESC_COUNTER("mmu_shadow_zapped"),
> +	STATS_DESC_COUNTER("mmu_pte_write"),
> +	STATS_DESC_COUNTER("mmu_pde_zapped"),
> +	STATS_DESC_COUNTER("mmu_flooded"),
> +	STATS_DESC_COUNTER("mmu_recycled"),
> +	STATS_DESC_COUNTER("mmu_cache_miss"),
> +	STATS_DESC_ICOUNTER("mmu_unsync"),
> +	STATS_DESC_ICOUNTER("largepages"),
> +	STATS_DESC_ICOUNTER("nx_largepages_splits"),
> +	STATS_DESC_ICOUNTER("max_mmu_page_hash_collisions"));
> +
> +struct _kvm_stats_header kvm_vm_stats_header = {
> +	.name_size = KVM_STATS_NAME_LEN,
> +	.count = ARRAY_SIZE(kvm_vm_stats_desc),
> +	.desc_offset = sizeof(struct kvm_stats_header),
> +	.data_offset = sizeof(struct kvm_stats_header) +
> +		sizeof(kvm_vm_stats_desc),
> +};
> +
> +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
> +	STATS_DESC_COUNTER("pf_fixed"),
> +	STATS_DESC_COUNTER("pf_guest"),
> +	STATS_DESC_COUNTER("tlb_flush"),
> +	STATS_DESC_COUNTER("invlpg"),
> +	STATS_DESC_COUNTER("exits"),
> +	STATS_DESC_COUNTER("io_exits"),
> +	STATS_DESC_COUNTER("mmio_exits"),
> +	STATS_DESC_COUNTER("signal_exits"),
> +	STATS_DESC_COUNTER("irq_window_exits"),
> +	STATS_DESC_COUNTER("nmi_window_exits"),
> +	STATS_DESC_COUNTER("l1d_flush"),
> +	STATS_DESC_COUNTER("halt_exits"),
> +	STATS_DESC_COUNTER("request_irq_exits"),
> +	STATS_DESC_COUNTER("irq_exits"),
> +	STATS_DESC_COUNTER("host_state_reload"),
> +	STATS_DESC_COUNTER("fpu_reload"),
> +	STATS_DESC_COUNTER("insn_emulation"),
> +	STATS_DESC_COUNTER("insn_emulation_fail"),
> +	STATS_DESC_COUNTER("hypercalls"),
> +	STATS_DESC_COUNTER("irq_injections"),
> +	STATS_DESC_COUNTER("nmi_injections"),
> +	STATS_DESC_COUNTER("req_event"),
> +	STATS_DESC_COUNTER("nested_run"));
> +
> +struct _kvm_stats_header kvm_vcpu_stats_header = {
> +	.name_size = KVM_STATS_NAME_LEN,
> +	.count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> +	.desc_offset = sizeof(struct kvm_stats_header),
> +	.data_offset = sizeof(struct kvm_stats_header) +
> +		sizeof(kvm_vcpu_stats_desc),
> +};
> +
>   struct kvm_stats_debugfs_item debugfs_entries[] = {
>   	VCPU_STAT("pf_fixed", pf_fixed),
>   	VCPU_STAT("pf_guest", pf_guest),
> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> index 97700e41db3b..c0a8e6ddc745 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -1240,6 +1240,19 @@ struct kvm_stats_debugfs_item {
>   	int mode;
>   };
>   
> +struct _kvm_stats_header {
> +	__u32 name_size;
> +	__u32 count;
> +	__u32 desc_offset;
> +	__u32 data_offset;
> +};
> +
> +#define KVM_STATS_NAME_LEN	48
> +struct _kvm_stats_desc {
> +	struct kvm_stats_desc desc;
> +	char name[KVM_STATS_NAME_LEN];
> +};
> +
>   #define KVM_DBGFS_GET_MODE(dbgfs_item)                                         \
>   	((dbgfs_item)->mode ? (dbgfs_item)->mode : 0644)
>   
> @@ -1253,8 +1266,127 @@ struct kvm_stats_debugfs_item {
>   	{ n, offsetof(struct kvm_vcpu, stat.common.x),			       \
>   	  KVM_STAT_VCPU, ## __VA_ARGS__ }
>   
> +#define STATS_DESC(stat, type, unit, scale, exp)			       \
> +	{								       \
> +		{							       \
> +			.flags = type | unit | scale,			       \
> +			.exponent = exp,				       \
> +			.size = 1					       \
> +		},							       \
> +		.name = stat,						       \
> +	}
> +#define STATS_DESC_CUMULATIVE(name, unit, scale, exponent)		       \
> +	STATS_DESC(name, KVM_STATS_TYPE_CUMULATIVE, unit, scale, exponent)
> +#define STATS_DESC_INSTANT(name, unit, scale, exponent)			       \
> +	STATS_DESC(name, KVM_STATS_TYPE_INSTANT, unit, scale, exponent)
> +
> +/* Cumulative counter */
> +#define STATS_DESC_COUNTER(name)					       \
> +	STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_NONE,		       \
> +		KVM_STATS_BASE_POW10, 0)
> +/* Instantaneous counter */
> +#define STATS_DESC_ICOUNTER(name)					       \
> +	STATS_DESC_INSTANT(name, KVM_STATS_UNIT_NONE,			       \
> +		KVM_STATS_BASE_POW10, 0)
> +
> +/* Cumulative clock cycles */
> +#define STATS_DESC_CYCLE(name)						       \
> +	STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_CYCLES,		       \
> +		KVM_STATS_BASE_POW10, 0)
> +/* Instantaneous clock cycles */
> +#define STATS_DESC_ICYCLE(name)						       \
> +	STATS_DESC_INSTANT(name, KVM_STATS_UNIT_CYCLES,			       \
> +		KVM_STATS_BASE_POW10, 0)
> +
> +/* Cumulative memory size in Byte */
> +#define STATS_DESC_SIZE_BYTE(name)					       \
> +	STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES,		       \
> +		KVM_STATS_BASE_POW2, 0)
> +/* Cumulative memory size in KiByte */
> +#define STATS_DESC_SIZE_KBYTE(name)					       \
> +	STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES,		       \
> +		KVM_STATS_BASE_POW2, 10)
> +/* Cumulative memory size in MiByte */
> +#define STATS_DESC_SIZE_MBYTE(name)					       \
> +	STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES,		       \
> +		KVM_STATS_BASE_POW2, 20)
> +/* Cumulative memory size in GiByte */
> +#define STATS_DESC_SIZE_GBYTE(name)					       \
> +	STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES,		       \
> +		KVM_STATS_BASE_POW2, 30)
> +
> +/* Instantaneous memory size in Byte */
> +#define STATS_DESC_ISIZE_BYTE(name)					       \
> +	STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES,			       \
> +		KVM_STATS_BASE_POW2, 0)
> +/* Instantaneous memory size in KiByte */
> +#define STATS_DESC_ISIZE_KBYTE(name)					       \
> +	STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES,			       \
> +		KVM_STATS_BASE_POW2, 10)
> +/* Instantaneous memory size in MiByte */
> +#define STATS_DESC_ISIZE_MBYTE(name)					       \
> +	STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES,			       \
> +		KVM_STATS_BASE_POW2, 20)
> +/* Instantaneous memory size in GiByte */
> +#define STATS_DESC_ISIZE_GBYTE(name)					       \
> +	STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES,			       \
> +		KVM_STATS_BASE_POW2, 30)
> +
> +/* Cumulative time in second */
> +#define STATS_DESC_TIME_SEC(name)					       \
> +	STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS,		       \
> +		KVM_STATS_BASE_POW10, 0)
> +/* Cumulative time in millisecond */
> +#define STATS_DESC_TIME_MSEC(name)					       \
> +	STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS,		       \
> +		KVM_STATS_BASE_POW10, -3)
> +/* Cumulative time in microsecond */
> +#define STATS_DESC_TIME_USEC(name)					       \
> +	STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS,		       \
> +		KVM_STATS_BASE_POW10, -6)
> +/* Cumulative time in nanosecond */
> +#define STATS_DESC_TIME_NSEC(name)					       \
> +	STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS,		       \
> +		KVM_STATS_BASE_POW10, -9)
> +
> +/* Instantaneous time in second */
> +#define STATS_DESC_ITIME_SEC(name)					       \
> +	STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS,		       \
> +		KVM_STATS_BASE_POW10, 0)
> +/* Instantaneous time in millisecond */
> +#define STATS_DESC_ITIME_MSEC(name)					       \
> +	STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS,		       \
> +		KVM_STATS_BASE_POW10, -3)
> +/* Instantaneous time in microsecond */
> +#define STATS_DESC_ITIME_USEC(name)					       \
> +	STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS,		       \
> +		KVM_STATS_BASE_POW10, -6)
> +/* Instantaneous time in nanosecond */
> +#define STATS_DESC_ITIME_NSEC(name)					       \
> +	STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS,		       \
> +		KVM_STATS_BASE_POW10, -9)
> +
> +#define DEFINE_VM_STATS_DESC(...) {					       \
> +	STATS_DESC_COUNTER("remote_tlb_flush"),				       \
> +	## __VA_ARGS__							       \
> +}
> +
> +#define DEFINE_VCPU_STATS_DESC(...) {					       \
> +	STATS_DESC_COUNTER("halt_successful_poll"),			       \
> +	STATS_DESC_COUNTER("halt_attempted_poll"),			       \
> +	STATS_DESC_COUNTER("halt_poll_invalid"),			       \
> +	STATS_DESC_COUNTER("halt_wakeup"),				       \
> +	STATS_DESC_TIME_NSEC("halt_poll_success_ns"),			       \
> +	STATS_DESC_TIME_NSEC("halt_poll_fail_ns"),			       \
> +	## __VA_ARGS__							       \
> +}
> +
>   extern struct kvm_stats_debugfs_item debugfs_entries[];
>   extern struct dentry *kvm_debugfs_dir;
> +extern struct _kvm_stats_header kvm_vm_stats_header;
> +extern struct _kvm_stats_header kvm_vcpu_stats_header;
> +extern struct _kvm_stats_desc kvm_vm_stats_desc[];
> +extern struct _kvm_stats_desc kvm_vcpu_stats_desc[];
>   
>   #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
>   static inline int mmu_notifier_retry(struct kvm *kvm, unsigned long mmu_seq)
> diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
> index 3fd9a7e9d90c..82db825c392c 100644
> --- a/include/uapi/linux/kvm.h
> +++ b/include/uapi/linux/kvm.h
> @@ -1082,6 +1082,7 @@ struct kvm_ppc_resize_hpt {
>   #define KVM_CAP_SGX_ATTRIBUTE 196
>   #define KVM_CAP_VM_COPY_ENC_CONTEXT_FROM 197
>   #define KVM_CAP_PTP_KVM 198
> +#define KVM_CAP_STATS_BINARY_FD 199
>   
>   #ifdef KVM_CAP_IRQ_ROUTING
>   
> @@ -1898,4 +1899,53 @@ struct kvm_dirty_gfn {
>   #define KVM_BUS_LOCK_DETECTION_OFF             (1 << 0)
>   #define KVM_BUS_LOCK_DETECTION_EXIT            (1 << 1)
>   
> +#define KVM_STATS_ID_MAXLEN		64
> +
> +struct kvm_stats_header {
> +	char id[KVM_STATS_ID_MAXLEN];
> +	__u32 name_size;
> +	__u32 count;
> +	__u32 desc_offset;
> +	__u32 data_offset;
> +};
> +
> +#define KVM_STATS_TYPE_SHIFT		0
> +#define KVM_STATS_TYPE_MASK		(0xF << KVM_STATS_TYPE_SHIFT)
> +#define KVM_STATS_TYPE_CUMULATIVE	(0x0 << KVM_STATS_TYPE_SHIFT)
> +#define KVM_STATS_TYPE_INSTANT		(0x1 << KVM_STATS_TYPE_SHIFT)
> +#define KVM_STATS_TYPE_MAX		KVM_STATS_TYPE_INSTANT
> +
> +#define KVM_STATS_UNIT_SHIFT		4
> +#define KVM_STATS_UNIT_MASK		(0xF << KVM_STATS_UNIT_SHIFT)
> +#define KVM_STATS_UNIT_NONE		(0x0 << KVM_STATS_UNIT_SHIFT)
> +#define KVM_STATS_UNIT_BYTES		(0x1 << KVM_STATS_UNIT_SHIFT)
> +#define KVM_STATS_UNIT_SECONDS		(0x2 << KVM_STATS_UNIT_SHIFT)
> +#define KVM_STATS_UNIT_CYCLES		(0x3 << KVM_STATS_UNIT_SHIFT)
> +#define KVM_STATS_UNIT_MAX		KVM_STATS_UNIT_CYCLES
> +
> +#define KVM_STATS_BASE_SHIFT		8
> +#define KVM_STATS_BASE_MASK		(0xF << KVM_STATS_BASE_SHIFT)
> +#define KVM_STATS_BASE_POW10		(0x0 << KVM_STATS_BASE_SHIFT)
> +#define KVM_STATS_BASE_POW2		(0x1 << KVM_STATS_BASE_SHIFT)
> +#define KVM_STATS_BASE_MAX		KVM_STATS_BASE_POW2
> +
> +struct kvm_stats_desc {
> +	__u32 flags;
> +	__s16 exponent;
> +	__u16 size;
> +	__u32 unused1;
> +	__u32 unused2;
> +	char name[0];
> +};
> +
> +struct kvm_vm_stats_data {
> +	unsigned long value[0];
> +};
> +
> +struct kvm_vcpu_stats_data {
> +	__u64 value[0];
> +};
> +
> +#define KVM_STATS_GETFD  _IOR(KVMIO,  0xcc, struct kvm_stats_header)
> +
>   #endif /* __LINUX_KVM_H */
> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> index 34a4cf265297..9e20e2ff78b4 100644
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -3409,6 +3409,120 @@ static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
>   	return 0;
>   }
>   
> +static ssize_t kvm_stats_read(char *id, struct _kvm_stats_header *header,
> +		struct _kvm_stats_desc *desc, void *stats, size_t size_stats,
> +		char __user *user_buffer, size_t size, loff_t *offset)
> +{
> +	ssize_t copylen, len, remain = size;
> +	size_t size_header, size_desc;
> +	loff_t pos = *offset;
> +	char __user *dest = user_buffer;
> +	void *src;
> +
> +	size_header = sizeof(*header);
> +	size_desc = header->count * sizeof(*desc);
> +
> +	len = KVM_STATS_ID_MAXLEN + size_header + size_desc + size_stats - pos;
> +	len = min(len, remain);
> +	if (len <= 0)
> +		return 0;
> +	remain = len;
> +
> +	/* Copy kvm stats header id string */
> +	copylen = KVM_STATS_ID_MAXLEN - pos;
> +	copylen = min(copylen, remain);
> +	if (copylen > 0) {
> +		src = id + pos;
> +		if (copy_to_user(dest, src, copylen))
> +			return -EFAULT;
> +		remain -= copylen;
> +		pos += copylen;
> +		dest += copylen;
> +	}
> +	/* Copy kvm stats header */
> +	copylen = KVM_STATS_ID_MAXLEN + size_header - pos;
> +	copylen = min(copylen, remain);
> +	if (copylen > 0) {
> +		src = header + pos - KVM_STATS_ID_MAXLEN;
> +		if (copy_to_user(dest, src, copylen))
> +			return -EFAULT;
> +		remain -= copylen;
> +		pos += copylen;
> +		dest += copylen;
> +	}
> +	/* Copy kvm stats descriptors */
> +	copylen = header->desc_offset + size_desc - pos;
> +	copylen = min(copylen, remain);
> +	if (copylen > 0) {
> +		src = desc + pos - header->desc_offset;
> +		if (copy_to_user(dest, src, copylen))
> +			return -EFAULT;
> +		remain -= copylen;
> +		pos += copylen;
> +		dest += copylen;
> +	}
> +	/* Copy kvm stats values */
> +	copylen = header->data_offset + size_stats - pos;
> +	copylen = min(copylen, remain);
> +	if (copylen > 0) {
> +		src = stats + pos - header->data_offset;
> +		if (copy_to_user(dest, src, copylen))
> +			return -EFAULT;
> +		remain -= copylen;
> +		pos += copylen;
> +		dest += copylen;
> +	}
> +


Is it possible to re-use the 'if' portion either via a separate function 
? For example,

static int copy_data(void *src)

{
         if (copy_to_user(dest, src, copylen))
             return -EFAULT;
         remain -= copylen;
         pos += copylen;
         dest += copylen;
         return 0;

}

and then calling it as,

         if (copylen > 0)

             copy_data(stats + pos - header->data_offset);

> +	*offset = pos;
> +	return len;
> +}
> +
> +static ssize_t kvm_vcpu_stats_read(struct file *file, char __user *user_buffer,
> +			      size_t size, loff_t *offset)
> +{
> +	char id[KVM_STATS_ID_MAXLEN];
> +	struct kvm_vcpu *vcpu = file->private_data;
> +
> +	snprintf(id, sizeof(id), "kvm-%d/vcpu-%d",
> +			task_pid_nr(current), vcpu->vcpu_id);
> +	return kvm_stats_read(id, &kvm_vcpu_stats_header,
> +			&kvm_vcpu_stats_desc[0], &vcpu->stat,
> +			sizeof(vcpu->stat), user_buffer, size, offset);
> +}
> +
> +static const struct file_operations kvm_vcpu_stats_fops = {
> +	.read = kvm_vcpu_stats_read,
> +	.llseek = noop_llseek,
> +};
> +
> +static int kvm_vcpu_ioctl_get_statsfd(struct kvm_vcpu *vcpu)
> +{
> +	int error, fd;
> +	struct file *file;
> +	char name[15 + ITOA_MAX_LEN + 1];
> +
> +	snprintf(name, sizeof(name), "kvm-vcpu-stats:%d", vcpu->vcpu_id);
> +
> +	error = get_unused_fd_flags(O_CLOEXEC);
> +	if (error < 0)
> +		return error;
> +	fd = error;
> +
> +	file = anon_inode_getfile(name, &kvm_vcpu_stats_fops, vcpu, O_RDONLY);
> +	if (IS_ERR(file)) {
> +		error = PTR_ERR(file);
> +		goto err_put_unused_fd;
> +	}
> +	file->f_mode |= FMODE_PREAD;
> +	fd_install(fd, file);
> +
> +	return fd;
> +
> +err_put_unused_fd:
> +	put_unused_fd(fd);
> +	return error;
> +}
> +
>   static long kvm_vcpu_ioctl(struct file *filp,
>   			   unsigned int ioctl, unsigned long arg)
>   {
> @@ -3606,6 +3720,10 @@ static long kvm_vcpu_ioctl(struct file *filp,
>   		r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
>   		break;
>   	}
> +	case KVM_STATS_GETFD: {
> +		r = kvm_vcpu_ioctl_get_statsfd(vcpu);
> +		break;
> +	}
>   	default:
>   		r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
>   	}
> @@ -3864,6 +3982,8 @@ static long kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg)
>   #else
>   		return 0;
>   #endif
> +	case KVM_CAP_STATS_BINARY_FD:
> +		return 1;
>   	default:
>   		break;
>   	}
> @@ -3967,6 +4087,48 @@ static int kvm_vm_ioctl_enable_cap_generic(struct kvm *kvm,
>   	}
>   }
>   
> +static ssize_t kvm_vm_stats_read(struct file *file, char __user *user_buffer,
> +			      size_t size, loff_t *offset)
> +{
> +	char id[KVM_STATS_ID_MAXLEN];
> +	struct kvm *kvm = file->private_data;
> +
> +	snprintf(id, sizeof(id), "kvm-%d", task_pid_nr(current));
> +	return kvm_stats_read(id, &kvm_vm_stats_header, &kvm_vm_stats_desc[0],
> +		&kvm->stat, sizeof(kvm->stat), user_buffer, size, offset);
> +}
> +
> +static const struct file_operations kvm_vm_stats_fops = {
> +	.read = kvm_vm_stats_read,
> +	.llseek = noop_llseek,
> +};
> +
> +static int kvm_vm_ioctl_get_statsfd(struct kvm *kvm)
> +{
> +	int error, fd;
> +	struct file *file;
> +
> +	error = get_unused_fd_flags(O_CLOEXEC);
> +	if (error < 0)
> +		return error;
> +	fd = error;


Why not just do,

             fd = get_unused_fd_flags(O_CLOEXEC);
             if (fd < 0)
                     return fd;

?

> +
> +	file = anon_inode_getfile("kvm-vm-stats",
> +			&kvm_vm_stats_fops, kvm, O_RDONLY);
> +	if (IS_ERR(file)) {
> +		error = PTR_ERR(file);
> +		goto err_put_unused_fd;


Here, we can do,

                if (IS_ERR(file)) {

                     put_unused_fd(fd);

                     return (PTR_ERR(file));

                 }

and won't need a goto statement.

Same comment for kvm_vcpu_ioctl_get_statsfd().

> +	}
> +	file->f_mode |= FMODE_PREAD;
> +	fd_install(fd, file);
> +
> +	return fd;
> +
> +err_put_unused_fd:
> +	put_unused_fd(fd);
> +	return error;
> +}
> +
>   static long kvm_vm_ioctl(struct file *filp,
>   			   unsigned int ioctl, unsigned long arg)
>   {
> @@ -4149,6 +4311,9 @@ static long kvm_vm_ioctl(struct file *filp,
>   	case KVM_RESET_DIRTY_RINGS:
>   		r = kvm_vm_ioctl_reset_dirty_pages(kvm);
>   		break;
> +	case KVM_STATS_GETFD:


This should be named KVM_GET_STATS_FD.  For example, we have names like 
KVM_GET_DIRTY_LOG etc.

Same comment for KVM_STATS_GETFD.

> +		r = kvm_vm_ioctl_get_statsfd(kvm);


It's probably more readable if we call it kvm_vm_ioctl_get_stats_fd().

> +		break;
>   	default:
>   		r = kvm_arch_vm_ioctl(filp, ioctl, arg);
>   	}
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Re: [PATCH v6 2/4] KVM: stats: Add fd-based API to read binary stats data

[Jing Zhang]

Hi Krish,

On Wed, May 26, 2021 at 1:53 PM Krish Sadhukhan
<krish.sadhukhan@oracle.com> wrote:
>
>
> On 5/24/21 8:18 AM, Jing Zhang wrote:
> > Provides a file descriptor per VM to read VM stats info/data.
> > Provides a file descriptor per vCPU to read vCPU stats info/data.
> >
> > Reviewed-by: David Matlack<dmatlack@google.com>
> > Reviewed-by: Ricardo Koller<ricarkol@google.com>
> > Signed-off-by: Jing Zhang<jingzhangos@google.com>
> > ---
> >   arch/arm64/kvm/guest.c    |  26 ++++++
> >   arch/mips/kvm/mips.c      |  52 ++++++++++++
> >   arch/powerpc/kvm/book3s.c |  52 ++++++++++++
> >   arch/powerpc/kvm/booke.c  |  45 +++++++++++
> >   arch/s390/kvm/kvm-s390.c  | 117 +++++++++++++++++++++++++++
> >   arch/x86/kvm/x86.c        |  53 ++++++++++++
> >   include/linux/kvm_host.h  | 132 ++++++++++++++++++++++++++++++
> >   include/uapi/linux/kvm.h  |  50 ++++++++++++
> >   virt/kvm/kvm_main.c       | 165 ++++++++++++++++++++++++++++++++++++++
> >   9 files changed, 692 insertions(+)
> >
> > diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
> > index 0e41331b0911..1cc1d83630ac 100644
> > --- a/arch/arm64/kvm/guest.c
> > +++ b/arch/arm64/kvm/guest.c
> > @@ -28,6 +28,32 @@
> >
> >   #include "trace.h"
> >
> > +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC();
> > +
> > +struct _kvm_stats_header kvm_vm_stats_header = {
> > +     .name_size = KVM_STATS_NAME_LEN,
> > +     .count = ARRAY_SIZE(kvm_vm_stats_desc),
> > +     .desc_offset = sizeof(struct kvm_stats_header),
> > +     .data_offset = sizeof(struct kvm_stats_header) +
> > +             sizeof(kvm_vm_stats_desc),
> > +};
> > +
> > +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
> > +     STATS_DESC_COUNTER("hvc_exit_stat"),
> > +     STATS_DESC_COUNTER("wfe_exit_stat"),
> > +     STATS_DESC_COUNTER("wfi_exit_stat"),
> > +     STATS_DESC_COUNTER("mmio_exit_user"),
> > +     STATS_DESC_COUNTER("mmio_exit_kernel"),
> > +     STATS_DESC_COUNTER("exits"));
> > +
> > +struct _kvm_stats_header kvm_vcpu_stats_header = {
> > +     .name_size = KVM_STATS_NAME_LEN,
> > +     .count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> > +     .desc_offset = sizeof(struct kvm_stats_header),
> > +     .data_offset = sizeof(struct kvm_stats_header) +
> > +             sizeof(kvm_vcpu_stats_desc),
> > +};
> > +
> >   struct kvm_stats_debugfs_item debugfs_entries[] = {
> >       VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> >       VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll), diff --git a/arch/mips/kvm/mips.c
> > b/arch/mips/kvm/mips.c index f4fc60c05e9c..f17a65743ccd 100644 ---
> > a/arch/mips/kvm/mips.c +++ b/arch/mips/kvm/mips.c @@ -38,6 +38,58 @@
> > #define VECTORSPACING 0x100 /* for EI/VI mode */ #endif +struct
> > _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(); +
> > +struct _kvm_stats_header kvm_vm_stats_header = { + .name_size =
> > KVM_STATS_NAME_LEN, + .count = ARRAY_SIZE(kvm_vm_stats_desc), +
> > .desc_offset = sizeof(struct kvm_stats_header), + .data_offset =
> > sizeof(struct kvm_stats_header) + + sizeof(kvm_vm_stats_desc), +}; +
> > +struct _kvm_stats_desc kvm_vcpu_stats_desc[] =
> > DEFINE_VCPU_STATS_DESC( + STATS_DESC_COUNTER("wait_exits"),
> > +     STATS_DESC_COUNTER("cache_exits"),
> > +     STATS_DESC_COUNTER("signal_exits"),
> > +     STATS_DESC_COUNTER("int_exits"),
> > +     STATS_DESC_COUNTER("cop_unusable_exits"),
> > +     STATS_DESC_COUNTER("tlbmod_exits"),
> > +     STATS_DESC_COUNTER("tlbmiss_ld_exits"),
> > +     STATS_DESC_COUNTER("tlbmiss_st_exits"),
> > +     STATS_DESC_COUNTER("addrerr_st_exits"),
> > +     STATS_DESC_COUNTER("addrerr_ld_exits"),
> > +     STATS_DESC_COUNTER("syscall_exits"),
> > +     STATS_DESC_COUNTER("resvd_inst_exits"),
> > +     STATS_DESC_COUNTER("break_inst_exits"),
> > +     STATS_DESC_COUNTER("trap_inst_exits"),
> > +     STATS_DESC_COUNTER("msa_fpe_exits"),
> > +     STATS_DESC_COUNTER("fpe_exits"),
> > +     STATS_DESC_COUNTER("msa_disabled_exits"),
> > +     STATS_DESC_COUNTER("flush_dcache_exits"),
> > +#ifdef CONFIG_KVM_MIPS_VZ
> > +     STATS_DESC_COUNTER("vz_gpsi_exits"),
> > +     STATS_DESC_COUNTER("vz_gsfc_exits"),
> > +     STATS_DESC_COUNTER("vz_hc_exits"),
> > +     STATS_DESC_COUNTER("vz_grr_exits"),
> > +     STATS_DESC_COUNTER("vz_gva_exits"),
> > +     STATS_DESC_COUNTER("vz_ghfc_exits"),
> > +     STATS_DESC_COUNTER("vz_gpa_exits"),
> > +     STATS_DESC_COUNTER("vz_resvd_exits"),
> > +#ifdef CONFIG_CPU_LOONGSON64
> > +     STATS_DESC_COUNTER("vz_cpucfg_exits"),
> > +#endif
> > +#endif
> > +     );
> > +
> > +struct _kvm_stats_header kvm_vcpu_stats_header = {
> > +     .name_size = KVM_STATS_NAME_LEN,
> > +     .count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> > +     .desc_offset = sizeof(struct kvm_stats_header),
> > +     .data_offset = sizeof(struct kvm_stats_header) +
> > +             sizeof(kvm_vcpu_stats_desc),
> > +};
> > +
> >   struct kvm_stats_debugfs_item debugfs_entries[] = {
> >       VCPU_STAT("wait", wait_exits),
> >       VCPU_STAT("cache", cache_exits),
> > diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
> > index bd3a10e1fdaf..5e8ee0d39ef9 100644
> > --- a/arch/powerpc/kvm/book3s.c
> > +++ b/arch/powerpc/kvm/book3s.c
> > @@ -38,6 +38,58 @@
> >
> >   /* #define EXIT_DEBUG */
> >
> > +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(
> > +     STATS_DESC_ICOUNTER("num_2M_pages"),
> > +     STATS_DESC_ICOUNTER("num_1G_pages"));
> > +
> > +struct _kvm_stats_header kvm_vm_stats_header = {
> > +     .name_size = KVM_STATS_NAME_LEN,
> > +     .count = ARRAY_SIZE(kvm_vm_stats_desc),
> > +     .desc_offset = sizeof(struct kvm_stats_header),
> > +     .data_offset = sizeof(struct kvm_stats_header) +
> > +             sizeof(kvm_vm_stats_desc),
> > +};
> > +
> > +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
> > +     STATS_DESC_COUNTER("sum_exits"),
> > +     STATS_DESC_COUNTER("mmio_exits"),
> > +     STATS_DESC_COUNTER("signal_exits"),
> > +     STATS_DESC_COUNTER("light_exits"),
> > +     STATS_DESC_COUNTER("itlb_real_miss_exits"),
> > +     STATS_DESC_COUNTER("itlb_virt_miss_exits"),
> > +     STATS_DESC_COUNTER("dtlb_real_miss_exits"),
> > +     STATS_DESC_COUNTER("dtlb_virt_miss_exits"),
> > +     STATS_DESC_COUNTER("syscall_exits"),
> > +     STATS_DESC_COUNTER("isi_exits"),
> > +     STATS_DESC_COUNTER("dsi_exits"),
> > +     STATS_DESC_COUNTER("emulated_inst_exits"),
> > +     STATS_DESC_COUNTER("dec_exits"),
> > +     STATS_DESC_COUNTER("ext_intr_exits"),
> > +     STATS_DESC_TIME_NSEC("halt_wait_ns"),
> > +     STATS_DESC_COUNTER("halt_successful_wait"),
> > +     STATS_DESC_COUNTER("dbell_exits"),
> > +     STATS_DESC_COUNTER("gdbell_exits"),
> > +     STATS_DESC_COUNTER("ld"),
> > +     STATS_DESC_COUNTER("st"),
> > +     STATS_DESC_COUNTER("pf_storage"),
> > +     STATS_DESC_COUNTER("pf_instruc"),
> > +     STATS_DESC_COUNTER("sp_storage"),
> > +     STATS_DESC_COUNTER("sp_instruc"),
> > +     STATS_DESC_COUNTER("queue_intr"),
> > +     STATS_DESC_COUNTER("ld_slow"),
> > +     STATS_DESC_COUNTER("st_slow"),
> > +     STATS_DESC_COUNTER("pthru_all"),
> > +     STATS_DESC_COUNTER("pthru_host"),
> > +     STATS_DESC_COUNTER("pthru_bad_aff"));
> > +
> > +struct _kvm_stats_header kvm_vcpu_stats_header = {
> > +     .name_size = KVM_STATS_NAME_LEN,
> > +     .count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> > +     .desc_offset = sizeof(struct kvm_stats_header),
> > +     .data_offset = sizeof(struct kvm_stats_header) +
> > +             sizeof(kvm_vcpu_stats_desc),
> > +};
> > +
> >   struct kvm_stats_debugfs_item debugfs_entries[] = {
> >       VCPU_STAT("exits", sum_exits),
> >       VCPU_STAT("mmio", mmio_exits),
> > diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
> > index 07fdd7a1254a..86d221e9193e 100644
> > --- a/arch/powerpc/kvm/booke.c
> > +++ b/arch/powerpc/kvm/booke.c
> > @@ -36,6 +36,51 @@
> >
> >   unsigned long kvmppc_booke_handlers;
> >
> > +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(
> > +     STATS_DESC_ICOUNTER("num_2M_pages"),
> > +     STATS_DESC_ICOUNTER("num_1G_pages"));
> > +
> > +struct _kvm_stats_header kvm_vm_stats_header = {
> > +     .name_size = KVM_STATS_NAME_LEN,
> > +     .count = ARRAY_SIZE(kvm_vm_stats_desc),
> > +     .desc_offset = sizeof(struct kvm_stats_header),
> > +     .data_offset = sizeof(struct kvm_stats_header) +
> > +             sizeof(kvm_vm_stats_desc),
> > +};
> > +
> > +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
> > +     STATS_DESC_COUNTER("sum_exits"),
> > +     STATS_DESC_COUNTER("mmio_exits"),
> > +     STATS_DESC_COUNTER("signal_exits"),
> > +     STATS_DESC_COUNTER("light_exits"),
> > +     STATS_DESC_COUNTER("itlb_real_miss_exits"),
> > +     STATS_DESC_COUNTER("itlb_virt_miss_exits"),
> > +     STATS_DESC_COUNTER("dtlb_real_miss_exits"),
> > +     STATS_DESC_COUNTER("dtlb_virt_miss_exits"),
> > +     STATS_DESC_COUNTER("syscall_exits"),
> > +     STATS_DESC_COUNTER("isi_exits"),
> > +     STATS_DESC_COUNTER("dsi_exits"),
> > +     STATS_DESC_COUNTER("emulated_inst_exits"),
> > +     STATS_DESC_COUNTER("dec_exits"),
> > +     STATS_DESC_COUNTER("ext_intr_exits"),
> > +     STATS_DESC_TIME_NSEC("halt_wait_ns"),
> > +     STATS_DESC_COUNTER("halt_successful_wait"),
> > +     STATS_DESC_COUNTER("dbell_exits"),
> > +     STATS_DESC_COUNTER("gdbell_exits"),
> > +     STATS_DESC_COUNTER("ld"),
> > +     STATS_DESC_COUNTER("st"),
> > +     STATS_DESC_COUNTER("pthru_all"),
> > +     STATS_DESC_COUNTER("pthru_host"),
> > +     STATS_DESC_COUNTER("pthru_bad_aff"));
> > +
> > +struct _kvm_stats_header kvm_vcpu_stats_header = {
> > +     .name_size = KVM_STATS_NAME_LEN,
> > +     .count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> > +     .desc_offset = sizeof(struct kvm_stats_header),
> > +     .data_offset = sizeof(struct kvm_stats_header) +
> > +             sizeof(kvm_vcpu_stats_desc),
> > +};
> > +
> >   struct kvm_stats_debugfs_item debugfs_entries[] = {
> >       VCPU_STAT("mmio", mmio_exits),
> >       VCPU_STAT("sig", signal_exits),
> > diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> > index d6bf3372bb10..003feee79fce 100644
> > --- a/arch/s390/kvm/kvm-s390.c
> > +++ b/arch/s390/kvm/kvm-s390.c
> > @@ -58,6 +58,123 @@
> >   #define VCPU_IRQS_MAX_BUF (sizeof(struct kvm_s390_irq) * \
> >                          (KVM_MAX_VCPUS + LOCAL_IRQS))
> >
> > +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(
> > +     STATS_DESC_COUNTER("inject_io"),
> > +     STATS_DESC_COUNTER("inject_float_mchk"),
> > +     STATS_DESC_COUNTER("inject_pfault_done"),
> > +     STATS_DESC_COUNTER("inject_service_signal"),
> > +     STATS_DESC_COUNTER("inject_virtio"));
> > +
> > +struct _kvm_stats_header kvm_vm_stats_header = {
> > +     .name_size = KVM_STATS_NAME_LEN,
> > +     .count = ARRAY_SIZE(kvm_vm_stats_desc),
> > +     .desc_offset = sizeof(struct kvm_stats_header),
> > +     .data_offset = sizeof(struct kvm_stats_header) +
> > +             sizeof(kvm_vm_stats_desc),
> > +};
> > +
> > +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
> > +     STATS_DESC_COUNTER("exit_userspace"),
> > +     STATS_DESC_COUNTER("exit_null"),
> > +     STATS_DESC_COUNTER("exit_external_request"),
> > +     STATS_DESC_COUNTER("exit_io_request"),
> > +     STATS_DESC_COUNTER("exit_external_interrupt"),
> > +     STATS_DESC_COUNTER("exit_stop_request"),
> > +     STATS_DESC_COUNTER("exit_validity"),
> > +     STATS_DESC_COUNTER("exit_instruction"),
> > +     STATS_DESC_COUNTER("exit_pei"),
> > +     STATS_DESC_COUNTER("halt_no_poll_steal"),
> > +     STATS_DESC_COUNTER("instruction_lctl"),
> > +     STATS_DESC_COUNTER("instruction_lctlg"),
> > +     STATS_DESC_COUNTER("instruction_stctl"),
> > +     STATS_DESC_COUNTER("instruction_stctg"),
> > +     STATS_DESC_COUNTER("exit_program_interruption"),
> > +     STATS_DESC_COUNTER("exit_instr_and_program"),
> > +     STATS_DESC_COUNTER("exit_operation_exception"),
> > +     STATS_DESC_COUNTER("deliver_ckc"),
> > +     STATS_DESC_COUNTER("deliver_cputm"),
> > +     STATS_DESC_COUNTER("deliver_external_call"),
> > +     STATS_DESC_COUNTER("deliver_emergency_signal"),
> > +     STATS_DESC_COUNTER("deliver_service_signal"),
> > +     STATS_DESC_COUNTER("deliver_virtio"),
> > +     STATS_DESC_COUNTER("deliver_stop_signal"),
> > +     STATS_DESC_COUNTER("deliver_prefix_signal"),
> > +     STATS_DESC_COUNTER("deliver_restart_signal"),
> > +     STATS_DESC_COUNTER("deliver_program"),
> > +     STATS_DESC_COUNTER("deliver_io"),
> > +     STATS_DESC_COUNTER("deliver_machine_check"),
> > +     STATS_DESC_COUNTER("exit_wait_state"),
> > +     STATS_DESC_COUNTER("inject_ckc"),
> > +     STATS_DESC_COUNTER("inject_cputm"),
> > +     STATS_DESC_COUNTER("inject_external_call"),
> > +     STATS_DESC_COUNTER("inject_emergency_signal"),
> > +     STATS_DESC_COUNTER("inject_mchk"),
> > +     STATS_DESC_COUNTER("inject_pfault_init"),
> > +     STATS_DESC_COUNTER("inject_program"),
> > +     STATS_DESC_COUNTER("inject_restart"),
> > +     STATS_DESC_COUNTER("inject_set_prefix"),
> > +     STATS_DESC_COUNTER("inject_stop_signal"),
> > +     STATS_DESC_COUNTER("instruction_epsw"),
> > +     STATS_DESC_COUNTER("instruction_gs"),
> > +     STATS_DESC_COUNTER("instruction_io_other"),
> > +     STATS_DESC_COUNTER("instruction_lpsw"),
> > +     STATS_DESC_COUNTER("instruction_lpswe"),
> > +     STATS_DESC_COUNTER("instruction_pfmf"),
> > +     STATS_DESC_COUNTER("instruction_ptff"),
> > +     STATS_DESC_COUNTER("instruction_sck"),
> > +     STATS_DESC_COUNTER("instruction_sckpf"),
> > +     STATS_DESC_COUNTER("instruction_stidp"),
> > +     STATS_DESC_COUNTER("instruction_spx"),
> > +     STATS_DESC_COUNTER("instruction_stpx"),
> > +     STATS_DESC_COUNTER("instruction_stap"),
> > +     STATS_DESC_COUNTER("instruction_iske"),
> > +     STATS_DESC_COUNTER("instruction_ri"),
> > +     STATS_DESC_COUNTER("instruction_rrbe"),
> > +     STATS_DESC_COUNTER("instruction_sske"),
> > +     STATS_DESC_COUNTER("instruction_ipte_interlock"),
> > +     STATS_DESC_COUNTER("instruction_stsi"),
> > +     STATS_DESC_COUNTER("instruction_stfl"),
> > +     STATS_DESC_COUNTER("instruction_tb"),
> > +     STATS_DESC_COUNTER("instruction_tpi"),
> > +     STATS_DESC_COUNTER("instruction_tprot"),
> > +     STATS_DESC_COUNTER("instruction_tsch"),
> > +     STATS_DESC_COUNTER("instruction_sie"),
> > +     STATS_DESC_COUNTER("instruction_essa"),
> > +     STATS_DESC_COUNTER("instruction_sthyi"),
> > +     STATS_DESC_COUNTER("instruction_sigp_sense"),
> > +     STATS_DESC_COUNTER("instruction_sigp_sense_running"),
> > +     STATS_DESC_COUNTER("instruction_sigp_external_call"),
> > +     STATS_DESC_COUNTER("instruction_sigp_emergency"),
> > +     STATS_DESC_COUNTER("instruction_sigp_cond_emergency"),
> > +     STATS_DESC_COUNTER("instruction_sigp_start"),
> > +     STATS_DESC_COUNTER("instruction_sigp_stop"),
> > +     STATS_DESC_COUNTER("instruction_sigp_stop_store_status"),
> > +     STATS_DESC_COUNTER("instruction_sigp_store_status"),
> > +     STATS_DESC_COUNTER("instruction_sigp_store_adtl_status"),
> > +     STATS_DESC_COUNTER("instruction_sigp_arch"),
> > +     STATS_DESC_COUNTER("instruction_sigp_prefix"),
> > +     STATS_DESC_COUNTER("instruction_sigp_restart"),
> > +     STATS_DESC_COUNTER("instruction_sigp_init_cpu_reset"),
> > +     STATS_DESC_COUNTER("instruction_sigp_cpu_reset"),
> > +     STATS_DESC_COUNTER("instruction_sigp_unknown"),
> > +     STATS_DESC_COUNTER("diagnose_10"),
> > +     STATS_DESC_COUNTER("diagnose_44"),
> > +     STATS_DESC_COUNTER("diagnose_9c"),
> > +     STATS_DESC_COUNTER("diagnose_9c_ignored"),
> > +     STATS_DESC_COUNTER("diagnose_258"),
> > +     STATS_DESC_COUNTER("diagnose_308"),
> > +     STATS_DESC_COUNTER("diagnose_500"),
> > +     STATS_DESC_COUNTER("diagnose_other"),
> > +     STATS_DESC_COUNTER("pfault_sync"));
> > +
> > +struct _kvm_stats_header kvm_vcpu_stats_header = {
> > +     .name_size = KVM_STATS_NAME_LEN,
> > +     .count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> > +     .desc_offset = sizeof(struct kvm_stats_header),
> > +     .data_offset = sizeof(struct kvm_stats_header) +
> > +             sizeof(kvm_vcpu_stats_desc),
> > +};
> > +
> >   struct kvm_stats_debugfs_item debugfs_entries[] = {
> >       VCPU_STAT("userspace_handled", exit_userspace),
> >       VCPU_STAT("exit_null", exit_null),
> > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> > index 9a93d80caff6..84880687c199 100644
> > --- a/arch/x86/kvm/x86.c
> > +++ b/arch/x86/kvm/x86.c
> > @@ -214,6 +214,59 @@ EXPORT_SYMBOL_GPL(host_xss);
> >   u64 __read_mostly supported_xss;
> >   EXPORT_SYMBOL_GPL(supported_xss);
> >
> > +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(
> > +     STATS_DESC_COUNTER("mmu_shadow_zapped"),
> > +     STATS_DESC_COUNTER("mmu_pte_write"),
> > +     STATS_DESC_COUNTER("mmu_pde_zapped"),
> > +     STATS_DESC_COUNTER("mmu_flooded"),
> > +     STATS_DESC_COUNTER("mmu_recycled"),
> > +     STATS_DESC_COUNTER("mmu_cache_miss"),
> > +     STATS_DESC_ICOUNTER("mmu_unsync"),
> > +     STATS_DESC_ICOUNTER("largepages"),
> > +     STATS_DESC_ICOUNTER("nx_largepages_splits"),
> > +     STATS_DESC_ICOUNTER("max_mmu_page_hash_collisions"));
> > +
> > +struct _kvm_stats_header kvm_vm_stats_header = {
> > +     .name_size = KVM_STATS_NAME_LEN,
> > +     .count = ARRAY_SIZE(kvm_vm_stats_desc),
> > +     .desc_offset = sizeof(struct kvm_stats_header),
> > +     .data_offset = sizeof(struct kvm_stats_header) +
> > +             sizeof(kvm_vm_stats_desc),
> > +};
> > +
> > +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
> > +     STATS_DESC_COUNTER("pf_fixed"),
> > +     STATS_DESC_COUNTER("pf_guest"),
> > +     STATS_DESC_COUNTER("tlb_flush"),
> > +     STATS_DESC_COUNTER("invlpg"),
> > +     STATS_DESC_COUNTER("exits"),
> > +     STATS_DESC_COUNTER("io_exits"),
> > +     STATS_DESC_COUNTER("mmio_exits"),
> > +     STATS_DESC_COUNTER("signal_exits"),
> > +     STATS_DESC_COUNTER("irq_window_exits"),
> > +     STATS_DESC_COUNTER("nmi_window_exits"),
> > +     STATS_DESC_COUNTER("l1d_flush"),
> > +     STATS_DESC_COUNTER("halt_exits"),
> > +     STATS_DESC_COUNTER("request_irq_exits"),
> > +     STATS_DESC_COUNTER("irq_exits"),
> > +     STATS_DESC_COUNTER("host_state_reload"),
> > +     STATS_DESC_COUNTER("fpu_reload"),
> > +     STATS_DESC_COUNTER("insn_emulation"),
> > +     STATS_DESC_COUNTER("insn_emulation_fail"),
> > +     STATS_DESC_COUNTER("hypercalls"),
> > +     STATS_DESC_COUNTER("irq_injections"),
> > +     STATS_DESC_COUNTER("nmi_injections"),
> > +     STATS_DESC_COUNTER("req_event"),
> > +     STATS_DESC_COUNTER("nested_run"));
> > +
> > +struct _kvm_stats_header kvm_vcpu_stats_header = {
> > +     .name_size = KVM_STATS_NAME_LEN,
> > +     .count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> > +     .desc_offset = sizeof(struct kvm_stats_header),
> > +     .data_offset = sizeof(struct kvm_stats_header) +
> > +             sizeof(kvm_vcpu_stats_desc),
> > +};
> > +
> >   struct kvm_stats_debugfs_item debugfs_entries[] = {
> >       VCPU_STAT("pf_fixed", pf_fixed),
> >       VCPU_STAT("pf_guest", pf_guest),
> > diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> > index 97700e41db3b..c0a8e6ddc745 100644
> > --- a/include/linux/kvm_host.h
> > +++ b/include/linux/kvm_host.h
> > @@ -1240,6 +1240,19 @@ struct kvm_stats_debugfs_item {
> >       int mode;
> >   };
> >
> > +struct _kvm_stats_header {
> > +     __u32 name_size;
> > +     __u32 count;
> > +     __u32 desc_offset;
> > +     __u32 data_offset;
> > +};
> > +
> > +#define KVM_STATS_NAME_LEN   48
> > +struct _kvm_stats_desc {
> > +     struct kvm_stats_desc desc;
> > +     char name[KVM_STATS_NAME_LEN];
> > +};
> > +
> >   #define KVM_DBGFS_GET_MODE(dbgfs_item)                                         \
> >       ((dbgfs_item)->mode ? (dbgfs_item)->mode : 0644)
> >
> > @@ -1253,8 +1266,127 @@ struct kvm_stats_debugfs_item {
> >       { n, offsetof(struct kvm_vcpu, stat.common.x),                         \
> >         KVM_STAT_VCPU, ## __VA_ARGS__ }
> >
> > +#define STATS_DESC(stat, type, unit, scale, exp)                            \
> > +     {                                                                      \
> > +             {                                                              \
> > +                     .flags = type | unit | scale,                          \
> > +                     .exponent = exp,                                       \
> > +                     .size = 1                                              \
> > +             },                                                             \
> > +             .name = stat,                                                  \
> > +     }
> > +#define STATS_DESC_CUMULATIVE(name, unit, scale, exponent)                  \
> > +     STATS_DESC(name, KVM_STATS_TYPE_CUMULATIVE, unit, scale, exponent)
> > +#define STATS_DESC_INSTANT(name, unit, scale, exponent)                             \
> > +     STATS_DESC(name, KVM_STATS_TYPE_INSTANT, unit, scale, exponent)
> > +
> > +/* Cumulative counter */
> > +#define STATS_DESC_COUNTER(name)                                            \
> > +     STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_NONE,                       \
> > +             KVM_STATS_BASE_POW10, 0)
> > +/* Instantaneous counter */
> > +#define STATS_DESC_ICOUNTER(name)                                           \
> > +     STATS_DESC_INSTANT(name, KVM_STATS_UNIT_NONE,                          \
> > +             KVM_STATS_BASE_POW10, 0)
> > +
> > +/* Cumulative clock cycles */
> > +#define STATS_DESC_CYCLE(name)                                                      \
> > +     STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_CYCLES,                     \
> > +             KVM_STATS_BASE_POW10, 0)
> > +/* Instantaneous clock cycles */
> > +#define STATS_DESC_ICYCLE(name)                                                     \
> > +     STATS_DESC_INSTANT(name, KVM_STATS_UNIT_CYCLES,                        \
> > +             KVM_STATS_BASE_POW10, 0)
> > +
> > +/* Cumulative memory size in Byte */
> > +#define STATS_DESC_SIZE_BYTE(name)                                          \
> > +     STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES,                      \
> > +             KVM_STATS_BASE_POW2, 0)
> > +/* Cumulative memory size in KiByte */
> > +#define STATS_DESC_SIZE_KBYTE(name)                                         \
> > +     STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES,                      \
> > +             KVM_STATS_BASE_POW2, 10)
> > +/* Cumulative memory size in MiByte */
> > +#define STATS_DESC_SIZE_MBYTE(name)                                         \
> > +     STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES,                      \
> > +             KVM_STATS_BASE_POW2, 20)
> > +/* Cumulative memory size in GiByte */
> > +#define STATS_DESC_SIZE_GBYTE(name)                                         \
> > +     STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES,                      \
> > +             KVM_STATS_BASE_POW2, 30)
> > +
> > +/* Instantaneous memory size in Byte */
> > +#define STATS_DESC_ISIZE_BYTE(name)                                         \
> > +     STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES,                         \
> > +             KVM_STATS_BASE_POW2, 0)
> > +/* Instantaneous memory size in KiByte */
> > +#define STATS_DESC_ISIZE_KBYTE(name)                                        \
> > +     STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES,                         \
> > +             KVM_STATS_BASE_POW2, 10)
> > +/* Instantaneous memory size in MiByte */
> > +#define STATS_DESC_ISIZE_MBYTE(name)                                        \
> > +     STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES,                         \
> > +             KVM_STATS_BASE_POW2, 20)
> > +/* Instantaneous memory size in GiByte */
> > +#define STATS_DESC_ISIZE_GBYTE(name)                                        \
> > +     STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES,                         \
> > +             KVM_STATS_BASE_POW2, 30)
> > +
> > +/* Cumulative time in second */
> > +#define STATS_DESC_TIME_SEC(name)                                           \
> > +     STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS,                    \
> > +             KVM_STATS_BASE_POW10, 0)
> > +/* Cumulative time in millisecond */
> > +#define STATS_DESC_TIME_MSEC(name)                                          \
> > +     STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS,                    \
> > +             KVM_STATS_BASE_POW10, -3)
> > +/* Cumulative time in microsecond */
> > +#define STATS_DESC_TIME_USEC(name)                                          \
> > +     STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS,                    \
> > +             KVM_STATS_BASE_POW10, -6)
> > +/* Cumulative time in nanosecond */
> > +#define STATS_DESC_TIME_NSEC(name)                                          \
> > +     STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS,                    \
> > +             KVM_STATS_BASE_POW10, -9)
> > +
> > +/* Instantaneous time in second */
> > +#define STATS_DESC_ITIME_SEC(name)                                          \
> > +     STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS,                       \
> > +             KVM_STATS_BASE_POW10, 0)
> > +/* Instantaneous time in millisecond */
> > +#define STATS_DESC_ITIME_MSEC(name)                                         \
> > +     STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS,                       \
> > +             KVM_STATS_BASE_POW10, -3)
> > +/* Instantaneous time in microsecond */
> > +#define STATS_DESC_ITIME_USEC(name)                                         \
> > +     STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS,                       \
> > +             KVM_STATS_BASE_POW10, -6)
> > +/* Instantaneous time in nanosecond */
> > +#define STATS_DESC_ITIME_NSEC(name)                                         \
> > +     STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS,                       \
> > +             KVM_STATS_BASE_POW10, -9)
> > +
> > +#define DEFINE_VM_STATS_DESC(...) {                                         \
> > +     STATS_DESC_COUNTER("remote_tlb_flush"),                                \
> > +     ## __VA_ARGS__                                                         \
> > +}
> > +
> > +#define DEFINE_VCPU_STATS_DESC(...) {                                               \
> > +     STATS_DESC_COUNTER("halt_successful_poll"),                            \
> > +     STATS_DESC_COUNTER("halt_attempted_poll"),                             \
> > +     STATS_DESC_COUNTER("halt_poll_invalid"),                               \
> > +     STATS_DESC_COUNTER("halt_wakeup"),                                     \
> > +     STATS_DESC_TIME_NSEC("halt_poll_success_ns"),                          \
> > +     STATS_DESC_TIME_NSEC("halt_poll_fail_ns"),                             \
> > +     ## __VA_ARGS__                                                         \
> > +}
> > +
> >   extern struct kvm_stats_debugfs_item debugfs_entries[];
> >   extern struct dentry *kvm_debugfs_dir;
> > +extern struct _kvm_stats_header kvm_vm_stats_header;
> > +extern struct _kvm_stats_header kvm_vcpu_stats_header;
> > +extern struct _kvm_stats_desc kvm_vm_stats_desc[];
> > +extern struct _kvm_stats_desc kvm_vcpu_stats_desc[];
> >
> >   #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
> >   static inline int mmu_notifier_retry(struct kvm *kvm, unsigned long mmu_seq)
> > diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
> > index 3fd9a7e9d90c..82db825c392c 100644
> > --- a/include/uapi/linux/kvm.h
> > +++ b/include/uapi/linux/kvm.h
> > @@ -1082,6 +1082,7 @@ struct kvm_ppc_resize_hpt {
> >   #define KVM_CAP_SGX_ATTRIBUTE 196
> >   #define KVM_CAP_VM_COPY_ENC_CONTEXT_FROM 197
> >   #define KVM_CAP_PTP_KVM 198
> > +#define KVM_CAP_STATS_BINARY_FD 199
> >
> >   #ifdef KVM_CAP_IRQ_ROUTING
> >
> > @@ -1898,4 +1899,53 @@ struct kvm_dirty_gfn {
> >   #define KVM_BUS_LOCK_DETECTION_OFF             (1 << 0)
> >   #define KVM_BUS_LOCK_DETECTION_EXIT            (1 << 1)
> >
> > +#define KVM_STATS_ID_MAXLEN          64
> > +
> > +struct kvm_stats_header {
> > +     char id[KVM_STATS_ID_MAXLEN];
> > +     __u32 name_size;
> > +     __u32 count;
> > +     __u32 desc_offset;
> > +     __u32 data_offset;
> > +};
> > +
> > +#define KVM_STATS_TYPE_SHIFT         0
> > +#define KVM_STATS_TYPE_MASK          (0xF << KVM_STATS_TYPE_SHIFT)
> > +#define KVM_STATS_TYPE_CUMULATIVE    (0x0 << KVM_STATS_TYPE_SHIFT)
> > +#define KVM_STATS_TYPE_INSTANT               (0x1 << KVM_STATS_TYPE_SHIFT)
> > +#define KVM_STATS_TYPE_MAX           KVM_STATS_TYPE_INSTANT
> > +
> > +#define KVM_STATS_UNIT_SHIFT         4
> > +#define KVM_STATS_UNIT_MASK          (0xF << KVM_STATS_UNIT_SHIFT)
> > +#define KVM_STATS_UNIT_NONE          (0x0 << KVM_STATS_UNIT_SHIFT)
> > +#define KVM_STATS_UNIT_BYTES         (0x1 << KVM_STATS_UNIT_SHIFT)
> > +#define KVM_STATS_UNIT_SECONDS               (0x2 << KVM_STATS_UNIT_SHIFT)
> > +#define KVM_STATS_UNIT_CYCLES                (0x3 << KVM_STATS_UNIT_SHIFT)
> > +#define KVM_STATS_UNIT_MAX           KVM_STATS_UNIT_CYCLES
> > +
> > +#define KVM_STATS_BASE_SHIFT         8
> > +#define KVM_STATS_BASE_MASK          (0xF << KVM_STATS_BASE_SHIFT)
> > +#define KVM_STATS_BASE_POW10         (0x0 << KVM_STATS_BASE_SHIFT)
> > +#define KVM_STATS_BASE_POW2          (0x1 << KVM_STATS_BASE_SHIFT)
> > +#define KVM_STATS_BASE_MAX           KVM_STATS_BASE_POW2
> > +
> > +struct kvm_stats_desc {
> > +     __u32 flags;
> > +     __s16 exponent;
> > +     __u16 size;
> > +     __u32 unused1;
> > +     __u32 unused2;
> > +     char name[0];
> > +};
> > +
> > +struct kvm_vm_stats_data {
> > +     unsigned long value[0];
> > +};
> > +
> > +struct kvm_vcpu_stats_data {
> > +     __u64 value[0];
> > +};
> > +
> > +#define KVM_STATS_GETFD  _IOR(KVMIO,  0xcc, struct kvm_stats_header)
> > +
> >   #endif /* __LINUX_KVM_H */
> > diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> > index 34a4cf265297..9e20e2ff78b4 100644
> > --- a/virt/kvm/kvm_main.c
> > +++ b/virt/kvm/kvm_main.c
> > @@ -3409,6 +3409,120 @@ static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
> >       return 0;
> >   }
> >
> > +static ssize_t kvm_stats_read(char *id, struct _kvm_stats_header *header,
> > +             struct _kvm_stats_desc *desc, void *stats, size_t size_stats,
> > +             char __user *user_buffer, size_t size, loff_t *offset)
> > +{
> > +     ssize_t copylen, len, remain = size;
> > +     size_t size_header, size_desc;
> > +     loff_t pos = *offset;
> > +     char __user *dest = user_buffer;
> > +     void *src;
> > +
> > +     size_header = sizeof(*header);
> > +     size_desc = header->count * sizeof(*desc);
> > +
> > +     len = KVM_STATS_ID_MAXLEN + size_header + size_desc + size_stats - pos;
> > +     len = min(len, remain);
> > +     if (len <= 0)
> > +             return 0;
> > +     remain = len;
> > +
> > +     /* Copy kvm stats header id string */
> > +     copylen = KVM_STATS_ID_MAXLEN - pos;
> > +     copylen = min(copylen, remain);
> > +     if (copylen > 0) {
> > +             src = id + pos;
> > +             if (copy_to_user(dest, src, copylen))
> > +                     return -EFAULT;
> > +             remain -= copylen;
> > +             pos += copylen;
> > +             dest += copylen;
> > +     }
> > +     /* Copy kvm stats header */
> > +     copylen = KVM_STATS_ID_MAXLEN + size_header - pos;
> > +     copylen = min(copylen, remain);
> > +     if (copylen > 0) {
> > +             src = header + pos - KVM_STATS_ID_MAXLEN;
> > +             if (copy_to_user(dest, src, copylen))
> > +                     return -EFAULT;
> > +             remain -= copylen;
> > +             pos += copylen;
> > +             dest += copylen;
> > +     }
> > +     /* Copy kvm stats descriptors */
> > +     copylen = header->desc_offset + size_desc - pos;
> > +     copylen = min(copylen, remain);
> > +     if (copylen > 0) {
> > +             src = desc + pos - header->desc_offset;
> > +             if (copy_to_user(dest, src, copylen))
> > +                     return -EFAULT;
> > +             remain -= copylen;
> > +             pos += copylen;
> > +             dest += copylen;
> > +     }
> > +     /* Copy kvm stats values */
> > +     copylen = header->data_offset + size_stats - pos;
> > +     copylen = min(copylen, remain);
> > +     if (copylen > 0) {
> > +             src = stats + pos - header->data_offset;
> > +             if (copy_to_user(dest, src, copylen))
> > +                     return -EFAULT;
> > +             remain -= copylen;
> > +             pos += copylen;
> > +             dest += copylen;
> > +     }
> > +
>
>
> Is it possible to re-use the 'if' portion either via a separate function
> ? For example,
>
> static int copy_data(void *src)
>
> {
>          if (copy_to_user(dest, src, copylen))
>              return -EFAULT;
>          remain -= copylen;
>          pos += copylen;
>          dest += copylen;
>          return 0;
>
> }
>
> and then calling it as,
>
>          if (copylen > 0)
>
>              copy_data(stats + pos - header->data_offset);
>
Not sure it is beneficial to add a separate function for this.
Besides src, we also need to pass the other three parameters,
remain, pos and dest. And we still need to check the return
value of copy_data.
> > +     *offset = pos;
> > +     return len;
> > +}
> > +
> > +static ssize_t kvm_vcpu_stats_read(struct file *file, char __user *user_buffer,
> > +                           size_t size, loff_t *offset)
> > +{
> > +     char id[KVM_STATS_ID_MAXLEN];
> > +     struct kvm_vcpu *vcpu = file->private_data;
> > +
> > +     snprintf(id, sizeof(id), "kvm-%d/vcpu-%d",
> > +                     task_pid_nr(current), vcpu->vcpu_id);
> > +     return kvm_stats_read(id, &kvm_vcpu_stats_header,
> > +                     &kvm_vcpu_stats_desc[0], &vcpu->stat,
> > +                     sizeof(vcpu->stat), user_buffer, size, offset);
> > +}
> > +
> > +static const struct file_operations kvm_vcpu_stats_fops = {
> > +     .read = kvm_vcpu_stats_read,
> > +     .llseek = noop_llseek,
> > +};
> > +
> > +static int kvm_vcpu_ioctl_get_statsfd(struct kvm_vcpu *vcpu)
> > +{
> > +     int error, fd;
> > +     struct file *file;
> > +     char name[15 + ITOA_MAX_LEN + 1];
> > +
> > +     snprintf(name, sizeof(name), "kvm-vcpu-stats:%d", vcpu->vcpu_id);
> > +
> > +     error = get_unused_fd_flags(O_CLOEXEC);
> > +     if (error < 0)
> > +             return error;
> > +     fd = error;
> > +
> > +     file = anon_inode_getfile(name, &kvm_vcpu_stats_fops, vcpu, O_RDONLY);
> > +     if (IS_ERR(file)) {
> > +             error = PTR_ERR(file);
> > +             goto err_put_unused_fd;
> > +     }
> > +     file->f_mode |= FMODE_PREAD;
> > +     fd_install(fd, file);
> > +
> > +     return fd;
> > +
> > +err_put_unused_fd:
> > +     put_unused_fd(fd);
> > +     return error;
> > +}
> > +
> >   static long kvm_vcpu_ioctl(struct file *filp,
> >                          unsigned int ioctl, unsigned long arg)
> >   {
> > @@ -3606,6 +3720,10 @@ static long kvm_vcpu_ioctl(struct file *filp,
> >               r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
> >               break;
> >       }
> > +     case KVM_STATS_GETFD: {
> > +             r = kvm_vcpu_ioctl_get_statsfd(vcpu);
> > +             break;
> > +     }
> >       default:
> >               r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
> >       }
> > @@ -3864,6 +3982,8 @@ static long kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg)
> >   #else
> >               return 0;
> >   #endif
> > +     case KVM_CAP_STATS_BINARY_FD:
> > +             return 1;
> >       default:
> >               break;
> >       }
> > @@ -3967,6 +4087,48 @@ static int kvm_vm_ioctl_enable_cap_generic(struct kvm *kvm,
> >       }
> >   }
> >
> > +static ssize_t kvm_vm_stats_read(struct file *file, char __user *user_buffer,
> > +                           size_t size, loff_t *offset)
> > +{
> > +     char id[KVM_STATS_ID_MAXLEN];
> > +     struct kvm *kvm = file->private_data;
> > +
> > +     snprintf(id, sizeof(id), "kvm-%d", task_pid_nr(current));
> > +     return kvm_stats_read(id, &kvm_vm_stats_header, &kvm_vm_stats_desc[0],
> > +             &kvm->stat, sizeof(kvm->stat), user_buffer, size, offset);
> > +}
> > +
> > +static const struct file_operations kvm_vm_stats_fops = {
> > +     .read = kvm_vm_stats_read,
> > +     .llseek = noop_llseek,
> > +};
> > +
> > +static int kvm_vm_ioctl_get_statsfd(struct kvm *kvm)
> > +{
> > +     int error, fd;
> > +     struct file *file;
> > +
> > +     error = get_unused_fd_flags(O_CLOEXEC);
> > +     if (error < 0)
> > +             return error;
> > +     fd = error;
>
>
> Why not just do,
>
>              fd = get_unused_fd_flags(O_CLOEXEC);
>              if (fd < 0)
>                      return fd;
>
> ?
>
Good point. Will do.
> > +
> > +     file = anon_inode_getfile("kvm-vm-stats",
> > +                     &kvm_vm_stats_fops, kvm, O_RDONLY);
> > +     if (IS_ERR(file)) {
> > +             error = PTR_ERR(file);
> > +             goto err_put_unused_fd;
>
>
> Here, we can do,
>
>                 if (IS_ERR(file)) {
>
>                      put_unused_fd(fd);
>
>                      return (PTR_ERR(file));
>
>                  }
>
> and won't need a goto statement.
>
> Same comment for kvm_vcpu_ioctl_get_statsfd().
>
Nice. Will do.
> > +     }
> > +     file->f_mode |= FMODE_PREAD;
> > +     fd_install(fd, file);
> > +
> > +     return fd;
> > +
> > +err_put_unused_fd:
> > +     put_unused_fd(fd);
> > +     return error;
> > +}
> > +
> >   static long kvm_vm_ioctl(struct file *filp,
> >                          unsigned int ioctl, unsigned long arg)
> >   {
> > @@ -4149,6 +4311,9 @@ static long kvm_vm_ioctl(struct file *filp,
> >       case KVM_RESET_DIRTY_RINGS:
> >               r = kvm_vm_ioctl_reset_dirty_pages(kvm);
> >               break;
> > +     case KVM_STATS_GETFD:
>
>
> This should be named KVM_GET_STATS_FD.  For example, we have names like
> KVM_GET_DIRTY_LOG etc.
>
> Same comment for KVM_STATS_GETFD.
>
Makes sense. Will do.
> > +             r = kvm_vm_ioctl_get_statsfd(kvm);
>
>
> It's probably more readable if we call it kvm_vm_ioctl_get_stats_fd().
>
Yep. Will do.
> > +             break;
> >       default:
> >               r = kvm_arch_vm_ioctl(filp, ioctl, arg);
> >       }

Thanks,
Jing

Re: [PATCH v6 2/4] KVM: stats: Add fd-based API to read binary stats data

[Jing Zhang]

Hi Krish,

On Wed, May 26, 2021 at 1:53 PM Krish Sadhukhan
<krish.sadhukhan@oracle.com> wrote:
>
>
> On 5/24/21 8:18 AM, Jing Zhang wrote:
> > Provides a file descriptor per VM to read VM stats info/data.
> > Provides a file descriptor per vCPU to read vCPU stats info/data.
> >
> > Reviewed-by: David Matlack<dmatlack@google.com>
> > Reviewed-by: Ricardo Koller<ricarkol@google.com>
> > Signed-off-by: Jing Zhang<jingzhangos@google.com>
> > ---
> >   arch/arm64/kvm/guest.c    |  26 ++++++
> >   arch/mips/kvm/mips.c      |  52 ++++++++++++
> >   arch/powerpc/kvm/book3s.c |  52 ++++++++++++
> >   arch/powerpc/kvm/booke.c  |  45 +++++++++++
> >   arch/s390/kvm/kvm-s390.c  | 117 +++++++++++++++++++++++++++
> >   arch/x86/kvm/x86.c        |  53 ++++++++++++
> >   include/linux/kvm_host.h  | 132 ++++++++++++++++++++++++++++++
> >   include/uapi/linux/kvm.h  |  50 ++++++++++++
> >   virt/kvm/kvm_main.c       | 165 ++++++++++++++++++++++++++++++++++++++
> >   9 files changed, 692 insertions(+)
> >
> > diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
> > index 0e41331b0911..1cc1d83630ac 100644
> > --- a/arch/arm64/kvm/guest.c
> > +++ b/arch/arm64/kvm/guest.c
> > @@ -28,6 +28,32 @@
> >
> >   #include "trace.h"
> >
> > +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC();
> > +
> > +struct _kvm_stats_header kvm_vm_stats_header = {
> > +     .name_size = KVM_STATS_NAME_LEN,
> > +     .count = ARRAY_SIZE(kvm_vm_stats_desc),
> > +     .desc_offset = sizeof(struct kvm_stats_header),
> > +     .data_offset = sizeof(struct kvm_stats_header) +
> > +             sizeof(kvm_vm_stats_desc),
> > +};
> > +
> > +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
> > +     STATS_DESC_COUNTER("hvc_exit_stat"),
> > +     STATS_DESC_COUNTER("wfe_exit_stat"),
> > +     STATS_DESC_COUNTER("wfi_exit_stat"),
> > +     STATS_DESC_COUNTER("mmio_exit_user"),
> > +     STATS_DESC_COUNTER("mmio_exit_kernel"),
> > +     STATS_DESC_COUNTER("exits"));
> > +
> > +struct _kvm_stats_header kvm_vcpu_stats_header = {
> > +     .name_size = KVM_STATS_NAME_LEN,
> > +     .count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> > +     .desc_offset = sizeof(struct kvm_stats_header),
> > +     .data_offset = sizeof(struct kvm_stats_header) +
> > +             sizeof(kvm_vcpu_stats_desc),
> > +};
> > +
> >   struct kvm_stats_debugfs_item debugfs_entries[] = {
> >       VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> >       VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll), diff --git a/arch/mips/kvm/mips.c
> > b/arch/mips/kvm/mips.c index f4fc60c05e9c..f17a65743ccd 100644 ---
> > a/arch/mips/kvm/mips.c +++ b/arch/mips/kvm/mips.c @@ -38,6 +38,58 @@
> > #define VECTORSPACING 0x100 /* for EI/VI mode */ #endif +struct
> > _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(); +
> > +struct _kvm_stats_header kvm_vm_stats_header = { + .name_size > > KVM_STATS_NAME_LEN, + .count = ARRAY_SIZE(kvm_vm_stats_desc), +
> > .desc_offset = sizeof(struct kvm_stats_header), + .data_offset > > sizeof(struct kvm_stats_header) + + sizeof(kvm_vm_stats_desc), +}; +
> > +struct _kvm_stats_desc kvm_vcpu_stats_desc[] > > DEFINE_VCPU_STATS_DESC( + STATS_DESC_COUNTER("wait_exits"),
> > +     STATS_DESC_COUNTER("cache_exits"),
> > +     STATS_DESC_COUNTER("signal_exits"),
> > +     STATS_DESC_COUNTER("int_exits"),
> > +     STATS_DESC_COUNTER("cop_unusable_exits"),
> > +     STATS_DESC_COUNTER("tlbmod_exits"),
> > +     STATS_DESC_COUNTER("tlbmiss_ld_exits"),
> > +     STATS_DESC_COUNTER("tlbmiss_st_exits"),
> > +     STATS_DESC_COUNTER("addrerr_st_exits"),
> > +     STATS_DESC_COUNTER("addrerr_ld_exits"),
> > +     STATS_DESC_COUNTER("syscall_exits"),
> > +     STATS_DESC_COUNTER("resvd_inst_exits"),
> > +     STATS_DESC_COUNTER("break_inst_exits"),
> > +     STATS_DESC_COUNTER("trap_inst_exits"),
> > +     STATS_DESC_COUNTER("msa_fpe_exits"),
> > +     STATS_DESC_COUNTER("fpe_exits"),
> > +     STATS_DESC_COUNTER("msa_disabled_exits"),
> > +     STATS_DESC_COUNTER("flush_dcache_exits"),
> > +#ifdef CONFIG_KVM_MIPS_VZ
> > +     STATS_DESC_COUNTER("vz_gpsi_exits"),
> > +     STATS_DESC_COUNTER("vz_gsfc_exits"),
> > +     STATS_DESC_COUNTER("vz_hc_exits"),
> > +     STATS_DESC_COUNTER("vz_grr_exits"),
> > +     STATS_DESC_COUNTER("vz_gva_exits"),
> > +     STATS_DESC_COUNTER("vz_ghfc_exits"),
> > +     STATS_DESC_COUNTER("vz_gpa_exits"),
> > +     STATS_DESC_COUNTER("vz_resvd_exits"),
> > +#ifdef CONFIG_CPU_LOONGSON64
> > +     STATS_DESC_COUNTER("vz_cpucfg_exits"),
> > +#endif
> > +#endif
> > +     );
> > +
> > +struct _kvm_stats_header kvm_vcpu_stats_header = {
> > +     .name_size = KVM_STATS_NAME_LEN,
> > +     .count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> > +     .desc_offset = sizeof(struct kvm_stats_header),
> > +     .data_offset = sizeof(struct kvm_stats_header) +
> > +             sizeof(kvm_vcpu_stats_desc),
> > +};
> > +
> >   struct kvm_stats_debugfs_item debugfs_entries[] = {
> >       VCPU_STAT("wait", wait_exits),
> >       VCPU_STAT("cache", cache_exits),
> > diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
> > index bd3a10e1fdaf..5e8ee0d39ef9 100644
> > --- a/arch/powerpc/kvm/book3s.c
> > +++ b/arch/powerpc/kvm/book3s.c
> > @@ -38,6 +38,58 @@
> >
> >   /* #define EXIT_DEBUG */
> >
> > +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(
> > +     STATS_DESC_ICOUNTER("num_2M_pages"),
> > +     STATS_DESC_ICOUNTER("num_1G_pages"));
> > +
> > +struct _kvm_stats_header kvm_vm_stats_header = {
> > +     .name_size = KVM_STATS_NAME_LEN,
> > +     .count = ARRAY_SIZE(kvm_vm_stats_desc),
> > +     .desc_offset = sizeof(struct kvm_stats_header),
> > +     .data_offset = sizeof(struct kvm_stats_header) +
> > +             sizeof(kvm_vm_stats_desc),
> > +};
> > +
> > +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
> > +     STATS_DESC_COUNTER("sum_exits"),
> > +     STATS_DESC_COUNTER("mmio_exits"),
> > +     STATS_DESC_COUNTER("signal_exits"),
> > +     STATS_DESC_COUNTER("light_exits"),
> > +     STATS_DESC_COUNTER("itlb_real_miss_exits"),
> > +     STATS_DESC_COUNTER("itlb_virt_miss_exits"),
> > +     STATS_DESC_COUNTER("dtlb_real_miss_exits"),
> > +     STATS_DESC_COUNTER("dtlb_virt_miss_exits"),
> > +     STATS_DESC_COUNTER("syscall_exits"),
> > +     STATS_DESC_COUNTER("isi_exits"),
> > +     STATS_DESC_COUNTER("dsi_exits"),
> > +     STATS_DESC_COUNTER("emulated_inst_exits"),
> > +     STATS_DESC_COUNTER("dec_exits"),
> > +     STATS_DESC_COUNTER("ext_intr_exits"),
> > +     STATS_DESC_TIME_NSEC("halt_wait_ns"),
> > +     STATS_DESC_COUNTER("halt_successful_wait"),
> > +     STATS_DESC_COUNTER("dbell_exits"),
> > +     STATS_DESC_COUNTER("gdbell_exits"),
> > +     STATS_DESC_COUNTER("ld"),
> > +     STATS_DESC_COUNTER("st"),
> > +     STATS_DESC_COUNTER("pf_storage"),
> > +     STATS_DESC_COUNTER("pf_instruc"),
> > +     STATS_DESC_COUNTER("sp_storage"),
> > +     STATS_DESC_COUNTER("sp_instruc"),
> > +     STATS_DESC_COUNTER("queue_intr"),
> > +     STATS_DESC_COUNTER("ld_slow"),
> > +     STATS_DESC_COUNTER("st_slow"),
> > +     STATS_DESC_COUNTER("pthru_all"),
> > +     STATS_DESC_COUNTER("pthru_host"),
> > +     STATS_DESC_COUNTER("pthru_bad_aff"));
> > +
> > +struct _kvm_stats_header kvm_vcpu_stats_header = {
> > +     .name_size = KVM_STATS_NAME_LEN,
> > +     .count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> > +     .desc_offset = sizeof(struct kvm_stats_header),
> > +     .data_offset = sizeof(struct kvm_stats_header) +
> > +             sizeof(kvm_vcpu_stats_desc),
> > +};
> > +
> >   struct kvm_stats_debugfs_item debugfs_entries[] = {
> >       VCPU_STAT("exits", sum_exits),
> >       VCPU_STAT("mmio", mmio_exits),
> > diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
> > index 07fdd7a1254a..86d221e9193e 100644
> > --- a/arch/powerpc/kvm/booke.c
> > +++ b/arch/powerpc/kvm/booke.c
> > @@ -36,6 +36,51 @@
> >
> >   unsigned long kvmppc_booke_handlers;
> >
> > +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(
> > +     STATS_DESC_ICOUNTER("num_2M_pages"),
> > +     STATS_DESC_ICOUNTER("num_1G_pages"));
> > +
> > +struct _kvm_stats_header kvm_vm_stats_header = {
> > +     .name_size = KVM_STATS_NAME_LEN,
> > +     .count = ARRAY_SIZE(kvm_vm_stats_desc),
> > +     .desc_offset = sizeof(struct kvm_stats_header),
> > +     .data_offset = sizeof(struct kvm_stats_header) +
> > +             sizeof(kvm_vm_stats_desc),
> > +};
> > +
> > +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
> > +     STATS_DESC_COUNTER("sum_exits"),
> > +     STATS_DESC_COUNTER("mmio_exits"),
> > +     STATS_DESC_COUNTER("signal_exits"),
> > +     STATS_DESC_COUNTER("light_exits"),
> > +     STATS_DESC_COUNTER("itlb_real_miss_exits"),
> > +     STATS_DESC_COUNTER("itlb_virt_miss_exits"),
> > +     STATS_DESC_COUNTER("dtlb_real_miss_exits"),
> > +     STATS_DESC_COUNTER("dtlb_virt_miss_exits"),
> > +     STATS_DESC_COUNTER("syscall_exits"),
> > +     STATS_DESC_COUNTER("isi_exits"),
> > +     STATS_DESC_COUNTER("dsi_exits"),
> > +     STATS_DESC_COUNTER("emulated_inst_exits"),
> > +     STATS_DESC_COUNTER("dec_exits"),
> > +     STATS_DESC_COUNTER("ext_intr_exits"),
> > +     STATS_DESC_TIME_NSEC("halt_wait_ns"),
> > +     STATS_DESC_COUNTER("halt_successful_wait"),
> > +     STATS_DESC_COUNTER("dbell_exits"),
> > +     STATS_DESC_COUNTER("gdbell_exits"),
> > +     STATS_DESC_COUNTER("ld"),
> > +     STATS_DESC_COUNTER("st"),
> > +     STATS_DESC_COUNTER("pthru_all"),
> > +     STATS_DESC_COUNTER("pthru_host"),
> > +     STATS_DESC_COUNTER("pthru_bad_aff"));
> > +
> > +struct _kvm_stats_header kvm_vcpu_stats_header = {
> > +     .name_size = KVM_STATS_NAME_LEN,
> > +     .count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> > +     .desc_offset = sizeof(struct kvm_stats_header),
> > +     .data_offset = sizeof(struct kvm_stats_header) +
> > +             sizeof(kvm_vcpu_stats_desc),
> > +};
> > +
> >   struct kvm_stats_debugfs_item debugfs_entries[] = {
> >       VCPU_STAT("mmio", mmio_exits),
> >       VCPU_STAT("sig", signal_exits),
> > diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> > index d6bf3372bb10..003feee79fce 100644
> > --- a/arch/s390/kvm/kvm-s390.c
> > +++ b/arch/s390/kvm/kvm-s390.c
> > @@ -58,6 +58,123 @@
> >   #define VCPU_IRQS_MAX_BUF (sizeof(struct kvm_s390_irq) * \
> >                          (KVM_MAX_VCPUS + LOCAL_IRQS))
> >
> > +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(
> > +     STATS_DESC_COUNTER("inject_io"),
> > +     STATS_DESC_COUNTER("inject_float_mchk"),
> > +     STATS_DESC_COUNTER("inject_pfault_done"),
> > +     STATS_DESC_COUNTER("inject_service_signal"),
> > +     STATS_DESC_COUNTER("inject_virtio"));
> > +
> > +struct _kvm_stats_header kvm_vm_stats_header = {
> > +     .name_size = KVM_STATS_NAME_LEN,
> > +     .count = ARRAY_SIZE(kvm_vm_stats_desc),
> > +     .desc_offset = sizeof(struct kvm_stats_header),
> > +     .data_offset = sizeof(struct kvm_stats_header) +
> > +             sizeof(kvm_vm_stats_desc),
> > +};
> > +
> > +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
> > +     STATS_DESC_COUNTER("exit_userspace"),
> > +     STATS_DESC_COUNTER("exit_null"),
> > +     STATS_DESC_COUNTER("exit_external_request"),
> > +     STATS_DESC_COUNTER("exit_io_request"),
> > +     STATS_DESC_COUNTER("exit_external_interrupt"),
> > +     STATS_DESC_COUNTER("exit_stop_request"),
> > +     STATS_DESC_COUNTER("exit_validity"),
> > +     STATS_DESC_COUNTER("exit_instruction"),
> > +     STATS_DESC_COUNTER("exit_pei"),
> > +     STATS_DESC_COUNTER("halt_no_poll_steal"),
> > +     STATS_DESC_COUNTER("instruction_lctl"),
> > +     STATS_DESC_COUNTER("instruction_lctlg"),
> > +     STATS_DESC_COUNTER("instruction_stctl"),
> > +     STATS_DESC_COUNTER("instruction_stctg"),
> > +     STATS_DESC_COUNTER("exit_program_interruption"),
> > +     STATS_DESC_COUNTER("exit_instr_and_program"),
> > +     STATS_DESC_COUNTER("exit_operation_exception"),
> > +     STATS_DESC_COUNTER("deliver_ckc"),
> > +     STATS_DESC_COUNTER("deliver_cputm"),
> > +     STATS_DESC_COUNTER("deliver_external_call"),
> > +     STATS_DESC_COUNTER("deliver_emergency_signal"),
> > +     STATS_DESC_COUNTER("deliver_service_signal"),
> > +     STATS_DESC_COUNTER("deliver_virtio"),
> > +     STATS_DESC_COUNTER("deliver_stop_signal"),
> > +     STATS_DESC_COUNTER("deliver_prefix_signal"),
> > +     STATS_DESC_COUNTER("deliver_restart_signal"),
> > +     STATS_DESC_COUNTER("deliver_program"),
> > +     STATS_DESC_COUNTER("deliver_io"),
> > +     STATS_DESC_COUNTER("deliver_machine_check"),
> > +     STATS_DESC_COUNTER("exit_wait_state"),
> > +     STATS_DESC_COUNTER("inject_ckc"),
> > +     STATS_DESC_COUNTER("inject_cputm"),
> > +     STATS_DESC_COUNTER("inject_external_call"),
> > +     STATS_DESC_COUNTER("inject_emergency_signal"),
> > +     STATS_DESC_COUNTER("inject_mchk"),
> > +     STATS_DESC_COUNTER("inject_pfault_init"),
> > +     STATS_DESC_COUNTER("inject_program"),
> > +     STATS_DESC_COUNTER("inject_restart"),
> > +     STATS_DESC_COUNTER("inject_set_prefix"),
> > +     STATS_DESC_COUNTER("inject_stop_signal"),
> > +     STATS_DESC_COUNTER("instruction_epsw"),
> > +     STATS_DESC_COUNTER("instruction_gs"),
> > +     STATS_DESC_COUNTER("instruction_io_other"),
> > +     STATS_DESC_COUNTER("instruction_lpsw"),
> > +     STATS_DESC_COUNTER("instruction_lpswe"),
> > +     STATS_DESC_COUNTER("instruction_pfmf"),
> > +     STATS_DESC_COUNTER("instruction_ptff"),
> > +     STATS_DESC_COUNTER("instruction_sck"),
> > +     STATS_DESC_COUNTER("instruction_sckpf"),
> > +     STATS_DESC_COUNTER("instruction_stidp"),
> > +     STATS_DESC_COUNTER("instruction_spx"),
> > +     STATS_DESC_COUNTER("instruction_stpx"),
> > +     STATS_DESC_COUNTER("instruction_stap"),
> > +     STATS_DESC_COUNTER("instruction_iske"),
> > +     STATS_DESC_COUNTER("instruction_ri"),
> > +     STATS_DESC_COUNTER("instruction_rrbe"),
> > +     STATS_DESC_COUNTER("instruction_sske"),
> > +     STATS_DESC_COUNTER("instruction_ipte_interlock"),
> > +     STATS_DESC_COUNTER("instruction_stsi"),
> > +     STATS_DESC_COUNTER("instruction_stfl"),
> > +     STATS_DESC_COUNTER("instruction_tb"),
> > +     STATS_DESC_COUNTER("instruction_tpi"),
> > +     STATS_DESC_COUNTER("instruction_tprot"),
> > +     STATS_DESC_COUNTER("instruction_tsch"),
> > +     STATS_DESC_COUNTER("instruction_sie"),
> > +     STATS_DESC_COUNTER("instruction_essa"),
> > +     STATS_DESC_COUNTER("instruction_sthyi"),
> > +     STATS_DESC_COUNTER("instruction_sigp_sense"),
> > +     STATS_DESC_COUNTER("instruction_sigp_sense_running"),
> > +     STATS_DESC_COUNTER("instruction_sigp_external_call"),
> > +     STATS_DESC_COUNTER("instruction_sigp_emergency"),
> > +     STATS_DESC_COUNTER("instruction_sigp_cond_emergency"),
> > +     STATS_DESC_COUNTER("instruction_sigp_start"),
> > +     STATS_DESC_COUNTER("instruction_sigp_stop"),
> > +     STATS_DESC_COUNTER("instruction_sigp_stop_store_status"),
> > +     STATS_DESC_COUNTER("instruction_sigp_store_status"),
> > +     STATS_DESC_COUNTER("instruction_sigp_store_adtl_status"),
> > +     STATS_DESC_COUNTER("instruction_sigp_arch"),
> > +     STATS_DESC_COUNTER("instruction_sigp_prefix"),
> > +     STATS_DESC_COUNTER("instruction_sigp_restart"),
> > +     STATS_DESC_COUNTER("instruction_sigp_init_cpu_reset"),
> > +     STATS_DESC_COUNTER("instruction_sigp_cpu_reset"),
> > +     STATS_DESC_COUNTER("instruction_sigp_unknown"),
> > +     STATS_DESC_COUNTER("diagnose_10"),
> > +     STATS_DESC_COUNTER("diagnose_44"),
> > +     STATS_DESC_COUNTER("diagnose_9c"),
> > +     STATS_DESC_COUNTER("diagnose_9c_ignored"),
> > +     STATS_DESC_COUNTER("diagnose_258"),
> > +     STATS_DESC_COUNTER("diagnose_308"),
> > +     STATS_DESC_COUNTER("diagnose_500"),
> > +     STATS_DESC_COUNTER("diagnose_other"),
> > +     STATS_DESC_COUNTER("pfault_sync"));
> > +
> > +struct _kvm_stats_header kvm_vcpu_stats_header = {
> > +     .name_size = KVM_STATS_NAME_LEN,
> > +     .count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> > +     .desc_offset = sizeof(struct kvm_stats_header),
> > +     .data_offset = sizeof(struct kvm_stats_header) +
> > +             sizeof(kvm_vcpu_stats_desc),
> > +};
> > +
> >   struct kvm_stats_debugfs_item debugfs_entries[] = {
> >       VCPU_STAT("userspace_handled", exit_userspace),
> >       VCPU_STAT("exit_null", exit_null),
> > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> > index 9a93d80caff6..84880687c199 100644
> > --- a/arch/x86/kvm/x86.c
> > +++ b/arch/x86/kvm/x86.c
> > @@ -214,6 +214,59 @@ EXPORT_SYMBOL_GPL(host_xss);
> >   u64 __read_mostly supported_xss;
> >   EXPORT_SYMBOL_GPL(supported_xss);
> >
> > +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(
> > +     STATS_DESC_COUNTER("mmu_shadow_zapped"),
> > +     STATS_DESC_COUNTER("mmu_pte_write"),
> > +     STATS_DESC_COUNTER("mmu_pde_zapped"),
> > +     STATS_DESC_COUNTER("mmu_flooded"),
> > +     STATS_DESC_COUNTER("mmu_recycled"),
> > +     STATS_DESC_COUNTER("mmu_cache_miss"),
> > +     STATS_DESC_ICOUNTER("mmu_unsync"),
> > +     STATS_DESC_ICOUNTER("largepages"),
> > +     STATS_DESC_ICOUNTER("nx_largepages_splits"),
> > +     STATS_DESC_ICOUNTER("max_mmu_page_hash_collisions"));
> > +
> > +struct _kvm_stats_header kvm_vm_stats_header = {
> > +     .name_size = KVM_STATS_NAME_LEN,
> > +     .count = ARRAY_SIZE(kvm_vm_stats_desc),
> > +     .desc_offset = sizeof(struct kvm_stats_header),
> > +     .data_offset = sizeof(struct kvm_stats_header) +
> > +             sizeof(kvm_vm_stats_desc),
> > +};
> > +
> > +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
> > +     STATS_DESC_COUNTER("pf_fixed"),
> > +     STATS_DESC_COUNTER("pf_guest"),
> > +     STATS_DESC_COUNTER("tlb_flush"),
> > +     STATS_DESC_COUNTER("invlpg"),
> > +     STATS_DESC_COUNTER("exits"),
> > +     STATS_DESC_COUNTER("io_exits"),
> > +     STATS_DESC_COUNTER("mmio_exits"),
> > +     STATS_DESC_COUNTER("signal_exits"),
> > +     STATS_DESC_COUNTER("irq_window_exits"),
> > +     STATS_DESC_COUNTER("nmi_window_exits"),
> > +     STATS_DESC_COUNTER("l1d_flush"),
> > +     STATS_DESC_COUNTER("halt_exits"),
> > +     STATS_DESC_COUNTER("request_irq_exits"),
> > +     STATS_DESC_COUNTER("irq_exits"),
> > +     STATS_DESC_COUNTER("host_state_reload"),
> > +     STATS_DESC_COUNTER("fpu_reload"),
> > +     STATS_DESC_COUNTER("insn_emulation"),
> > +     STATS_DESC_COUNTER("insn_emulation_fail"),
> > +     STATS_DESC_COUNTER("hypercalls"),
> > +     STATS_DESC_COUNTER("irq_injections"),
> > +     STATS_DESC_COUNTER("nmi_injections"),
> > +     STATS_DESC_COUNTER("req_event"),
> > +     STATS_DESC_COUNTER("nested_run"));
> > +
> > +struct _kvm_stats_header kvm_vcpu_stats_header = {
> > +     .name_size = KVM_STATS_NAME_LEN,
> > +     .count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> > +     .desc_offset = sizeof(struct kvm_stats_header),
> > +     .data_offset = sizeof(struct kvm_stats_header) +
> > +             sizeof(kvm_vcpu_stats_desc),
> > +};
> > +
> >   struct kvm_stats_debugfs_item debugfs_entries[] = {
> >       VCPU_STAT("pf_fixed", pf_fixed),
> >       VCPU_STAT("pf_guest", pf_guest),
> > diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> > index 97700e41db3b..c0a8e6ddc745 100644
> > --- a/include/linux/kvm_host.h
> > +++ b/include/linux/kvm_host.h
> > @@ -1240,6 +1240,19 @@ struct kvm_stats_debugfs_item {
> >       int mode;
> >   };
> >
> > +struct _kvm_stats_header {
> > +     __u32 name_size;
> > +     __u32 count;
> > +     __u32 desc_offset;
> > +     __u32 data_offset;
> > +};
> > +
> > +#define KVM_STATS_NAME_LEN   48
> > +struct _kvm_stats_desc {
> > +     struct kvm_stats_desc desc;
> > +     char name[KVM_STATS_NAME_LEN];
> > +};
> > +
> >   #define KVM_DBGFS_GET_MODE(dbgfs_item)                                         \
> >       ((dbgfs_item)->mode ? (dbgfs_item)->mode : 0644)
> >
> > @@ -1253,8 +1266,127 @@ struct kvm_stats_debugfs_item {
> >       { n, offsetof(struct kvm_vcpu, stat.common.x),                         \
> >         KVM_STAT_VCPU, ## __VA_ARGS__ }
> >
> > +#define STATS_DESC(stat, type, unit, scale, exp)                            \
> > +     {                                                                      \
> > +             {                                                              \
> > +                     .flags = type | unit | scale,                          \
> > +                     .exponent = exp,                                       \
> > +                     .size = 1                                              \
> > +             },                                                             \
> > +             .name = stat,                                                  \
> > +     }
> > +#define STATS_DESC_CUMULATIVE(name, unit, scale, exponent)                  \
> > +     STATS_DESC(name, KVM_STATS_TYPE_CUMULATIVE, unit, scale, exponent)
> > +#define STATS_DESC_INSTANT(name, unit, scale, exponent)                             \
> > +     STATS_DESC(name, KVM_STATS_TYPE_INSTANT, unit, scale, exponent)
> > +
> > +/* Cumulative counter */
> > +#define STATS_DESC_COUNTER(name)                                            \
> > +     STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_NONE,                       \
> > +             KVM_STATS_BASE_POW10, 0)
> > +/* Instantaneous counter */
> > +#define STATS_DESC_ICOUNTER(name)                                           \
> > +     STATS_DESC_INSTANT(name, KVM_STATS_UNIT_NONE,                          \
> > +             KVM_STATS_BASE_POW10, 0)
> > +
> > +/* Cumulative clock cycles */
> > +#define STATS_DESC_CYCLE(name)                                                      \
> > +     STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_CYCLES,                     \
> > +             KVM_STATS_BASE_POW10, 0)
> > +/* Instantaneous clock cycles */
> > +#define STATS_DESC_ICYCLE(name)                                                     \
> > +     STATS_DESC_INSTANT(name, KVM_STATS_UNIT_CYCLES,                        \
> > +             KVM_STATS_BASE_POW10, 0)
> > +
> > +/* Cumulative memory size in Byte */
> > +#define STATS_DESC_SIZE_BYTE(name)                                          \
> > +     STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES,                      \
> > +             KVM_STATS_BASE_POW2, 0)
> > +/* Cumulative memory size in KiByte */
> > +#define STATS_DESC_SIZE_KBYTE(name)                                         \
> > +     STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES,                      \
> > +             KVM_STATS_BASE_POW2, 10)
> > +/* Cumulative memory size in MiByte */
> > +#define STATS_DESC_SIZE_MBYTE(name)                                         \
> > +     STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES,                      \
> > +             KVM_STATS_BASE_POW2, 20)
> > +/* Cumulative memory size in GiByte */
> > +#define STATS_DESC_SIZE_GBYTE(name)                                         \
> > +     STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES,                      \
> > +             KVM_STATS_BASE_POW2, 30)
> > +
> > +/* Instantaneous memory size in Byte */
> > +#define STATS_DESC_ISIZE_BYTE(name)                                         \
> > +     STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES,                         \
> > +             KVM_STATS_BASE_POW2, 0)
> > +/* Instantaneous memory size in KiByte */
> > +#define STATS_DESC_ISIZE_KBYTE(name)                                        \
> > +     STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES,                         \
> > +             KVM_STATS_BASE_POW2, 10)
> > +/* Instantaneous memory size in MiByte */
> > +#define STATS_DESC_ISIZE_MBYTE(name)                                        \
> > +     STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES,                         \
> > +             KVM_STATS_BASE_POW2, 20)
> > +/* Instantaneous memory size in GiByte */
> > +#define STATS_DESC_ISIZE_GBYTE(name)                                        \
> > +     STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES,                         \
> > +             KVM_STATS_BASE_POW2, 30)
> > +
> > +/* Cumulative time in second */
> > +#define STATS_DESC_TIME_SEC(name)                                           \
> > +     STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS,                    \
> > +             KVM_STATS_BASE_POW10, 0)
> > +/* Cumulative time in millisecond */
> > +#define STATS_DESC_TIME_MSEC(name)                                          \
> > +     STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS,                    \
> > +             KVM_STATS_BASE_POW10, -3)
> > +/* Cumulative time in microsecond */
> > +#define STATS_DESC_TIME_USEC(name)                                          \
> > +     STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS,                    \
> > +             KVM_STATS_BASE_POW10, -6)
> > +/* Cumulative time in nanosecond */
> > +#define STATS_DESC_TIME_NSEC(name)                                          \
> > +     STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS,                    \
> > +             KVM_STATS_BASE_POW10, -9)
> > +
> > +/* Instantaneous time in second */
> > +#define STATS_DESC_ITIME_SEC(name)                                          \
> > +     STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS,                       \
> > +             KVM_STATS_BASE_POW10, 0)
> > +/* Instantaneous time in millisecond */
> > +#define STATS_DESC_ITIME_MSEC(name)                                         \
> > +     STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS,                       \
> > +             KVM_STATS_BASE_POW10, -3)
> > +/* Instantaneous time in microsecond */
> > +#define STATS_DESC_ITIME_USEC(name)                                         \
> > +     STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS,                       \
> > +             KVM_STATS_BASE_POW10, -6)
> > +/* Instantaneous time in nanosecond */
> > +#define STATS_DESC_ITIME_NSEC(name)                                         \
> > +     STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS,                       \
> > +             KVM_STATS_BASE_POW10, -9)
> > +
> > +#define DEFINE_VM_STATS_DESC(...) {                                         \
> > +     STATS_DESC_COUNTER("remote_tlb_flush"),                                \
> > +     ## __VA_ARGS__                                                         \
> > +}
> > +
> > +#define DEFINE_VCPU_STATS_DESC(...) {                                               \
> > +     STATS_DESC_COUNTER("halt_successful_poll"),                            \
> > +     STATS_DESC_COUNTER("halt_attempted_poll"),                             \
> > +     STATS_DESC_COUNTER("halt_poll_invalid"),                               \
> > +     STATS_DESC_COUNTER("halt_wakeup"),                                     \
> > +     STATS_DESC_TIME_NSEC("halt_poll_success_ns"),                          \
> > +     STATS_DESC_TIME_NSEC("halt_poll_fail_ns"),                             \
> > +     ## __VA_ARGS__                                                         \
> > +}
> > +
> >   extern struct kvm_stats_debugfs_item debugfs_entries[];
> >   extern struct dentry *kvm_debugfs_dir;
> > +extern struct _kvm_stats_header kvm_vm_stats_header;
> > +extern struct _kvm_stats_header kvm_vcpu_stats_header;
> > +extern struct _kvm_stats_desc kvm_vm_stats_desc[];
> > +extern struct _kvm_stats_desc kvm_vcpu_stats_desc[];
> >
> >   #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
> >   static inline int mmu_notifier_retry(struct kvm *kvm, unsigned long mmu_seq)
> > diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
> > index 3fd9a7e9d90c..82db825c392c 100644
> > --- a/include/uapi/linux/kvm.h
> > +++ b/include/uapi/linux/kvm.h
> > @@ -1082,6 +1082,7 @@ struct kvm_ppc_resize_hpt {
> >   #define KVM_CAP_SGX_ATTRIBUTE 196
> >   #define KVM_CAP_VM_COPY_ENC_CONTEXT_FROM 197
> >   #define KVM_CAP_PTP_KVM 198
> > +#define KVM_CAP_STATS_BINARY_FD 199
> >
> >   #ifdef KVM_CAP_IRQ_ROUTING
> >
> > @@ -1898,4 +1899,53 @@ struct kvm_dirty_gfn {
> >   #define KVM_BUS_LOCK_DETECTION_OFF             (1 << 0)
> >   #define KVM_BUS_LOCK_DETECTION_EXIT            (1 << 1)
> >
> > +#define KVM_STATS_ID_MAXLEN          64
> > +
> > +struct kvm_stats_header {
> > +     char id[KVM_STATS_ID_MAXLEN];
> > +     __u32 name_size;
> > +     __u32 count;
> > +     __u32 desc_offset;
> > +     __u32 data_offset;
> > +};
> > +
> > +#define KVM_STATS_TYPE_SHIFT         0
> > +#define KVM_STATS_TYPE_MASK          (0xF << KVM_STATS_TYPE_SHIFT)
> > +#define KVM_STATS_TYPE_CUMULATIVE    (0x0 << KVM_STATS_TYPE_SHIFT)
> > +#define KVM_STATS_TYPE_INSTANT               (0x1 << KVM_STATS_TYPE_SHIFT)
> > +#define KVM_STATS_TYPE_MAX           KVM_STATS_TYPE_INSTANT
> > +
> > +#define KVM_STATS_UNIT_SHIFT         4
> > +#define KVM_STATS_UNIT_MASK          (0xF << KVM_STATS_UNIT_SHIFT)
> > +#define KVM_STATS_UNIT_NONE          (0x0 << KVM_STATS_UNIT_SHIFT)
> > +#define KVM_STATS_UNIT_BYTES         (0x1 << KVM_STATS_UNIT_SHIFT)
> > +#define KVM_STATS_UNIT_SECONDS               (0x2 << KVM_STATS_UNIT_SHIFT)
> > +#define KVM_STATS_UNIT_CYCLES                (0x3 << KVM_STATS_UNIT_SHIFT)
> > +#define KVM_STATS_UNIT_MAX           KVM_STATS_UNIT_CYCLES
> > +
> > +#define KVM_STATS_BASE_SHIFT         8
> > +#define KVM_STATS_BASE_MASK          (0xF << KVM_STATS_BASE_SHIFT)
> > +#define KVM_STATS_BASE_POW10         (0x0 << KVM_STATS_BASE_SHIFT)
> > +#define KVM_STATS_BASE_POW2          (0x1 << KVM_STATS_BASE_SHIFT)
> > +#define KVM_STATS_BASE_MAX           KVM_STATS_BASE_POW2
> > +
> > +struct kvm_stats_desc {
> > +     __u32 flags;
> > +     __s16 exponent;
> > +     __u16 size;
> > +     __u32 unused1;
> > +     __u32 unused2;
> > +     char name[0];
> > +};
> > +
> > +struct kvm_vm_stats_data {
> > +     unsigned long value[0];
> > +};
> > +
> > +struct kvm_vcpu_stats_data {
> > +     __u64 value[0];
> > +};
> > +
> > +#define KVM_STATS_GETFD  _IOR(KVMIO,  0xcc, struct kvm_stats_header)
> > +
> >   #endif /* __LINUX_KVM_H */
> > diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> > index 34a4cf265297..9e20e2ff78b4 100644
> > --- a/virt/kvm/kvm_main.c
> > +++ b/virt/kvm/kvm_main.c
> > @@ -3409,6 +3409,120 @@ static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
> >       return 0;
> >   }
> >
> > +static ssize_t kvm_stats_read(char *id, struct _kvm_stats_header *header,
> > +             struct _kvm_stats_desc *desc, void *stats, size_t size_stats,
> > +             char __user *user_buffer, size_t size, loff_t *offset)
> > +{
> > +     ssize_t copylen, len, remain = size;
> > +     size_t size_header, size_desc;
> > +     loff_t pos = *offset;
> > +     char __user *dest = user_buffer;
> > +     void *src;
> > +
> > +     size_header = sizeof(*header);
> > +     size_desc = header->count * sizeof(*desc);
> > +
> > +     len = KVM_STATS_ID_MAXLEN + size_header + size_desc + size_stats - pos;
> > +     len = min(len, remain);
> > +     if (len <= 0)
> > +             return 0;
> > +     remain = len;
> > +
> > +     /* Copy kvm stats header id string */
> > +     copylen = KVM_STATS_ID_MAXLEN - pos;
> > +     copylen = min(copylen, remain);
> > +     if (copylen > 0) {
> > +             src = id + pos;
> > +             if (copy_to_user(dest, src, copylen))
> > +                     return -EFAULT;
> > +             remain -= copylen;
> > +             pos += copylen;
> > +             dest += copylen;
> > +     }
> > +     /* Copy kvm stats header */
> > +     copylen = KVM_STATS_ID_MAXLEN + size_header - pos;
> > +     copylen = min(copylen, remain);
> > +     if (copylen > 0) {
> > +             src = header + pos - KVM_STATS_ID_MAXLEN;
> > +             if (copy_to_user(dest, src, copylen))
> > +                     return -EFAULT;
> > +             remain -= copylen;
> > +             pos += copylen;
> > +             dest += copylen;
> > +     }
> > +     /* Copy kvm stats descriptors */
> > +     copylen = header->desc_offset + size_desc - pos;
> > +     copylen = min(copylen, remain);
> > +     if (copylen > 0) {
> > +             src = desc + pos - header->desc_offset;
> > +             if (copy_to_user(dest, src, copylen))
> > +                     return -EFAULT;
> > +             remain -= copylen;
> > +             pos += copylen;
> > +             dest += copylen;
> > +     }
> > +     /* Copy kvm stats values */
> > +     copylen = header->data_offset + size_stats - pos;
> > +     copylen = min(copylen, remain);
> > +     if (copylen > 0) {
> > +             src = stats + pos - header->data_offset;
> > +             if (copy_to_user(dest, src, copylen))
> > +                     return -EFAULT;
> > +             remain -= copylen;
> > +             pos += copylen;
> > +             dest += copylen;
> > +     }
> > +
>
>
> Is it possible to re-use the 'if' portion either via a separate function
> ? For example,
>
> static int copy_data(void *src)
>
> {
>          if (copy_to_user(dest, src, copylen))
>              return -EFAULT;
>          remain -= copylen;
>          pos += copylen;
>          dest += copylen;
>          return 0;
>
> }
>
> and then calling it as,
>
>          if (copylen > 0)
>
>              copy_data(stats + pos - header->data_offset);
>
Not sure it is beneficial to add a separate function for this.
Besides src, we also need to pass the other three parameters,
remain, pos and dest. And we still need to check the return
value of copy_data.
> > +     *offset = pos;
> > +     return len;
> > +}
> > +
> > +static ssize_t kvm_vcpu_stats_read(struct file *file, char __user *user_buffer,
> > +                           size_t size, loff_t *offset)
> > +{
> > +     char id[KVM_STATS_ID_MAXLEN];
> > +     struct kvm_vcpu *vcpu = file->private_data;
> > +
> > +     snprintf(id, sizeof(id), "kvm-%d/vcpu-%d",
> > +                     task_pid_nr(current), vcpu->vcpu_id);
> > +     return kvm_stats_read(id, &kvm_vcpu_stats_header,
> > +                     &kvm_vcpu_stats_desc[0], &vcpu->stat,
> > +                     sizeof(vcpu->stat), user_buffer, size, offset);
> > +}
> > +
> > +static const struct file_operations kvm_vcpu_stats_fops = {
> > +     .read = kvm_vcpu_stats_read,
> > +     .llseek = noop_llseek,
> > +};
> > +
> > +static int kvm_vcpu_ioctl_get_statsfd(struct kvm_vcpu *vcpu)
> > +{
> > +     int error, fd;
> > +     struct file *file;
> > +     char name[15 + ITOA_MAX_LEN + 1];
> > +
> > +     snprintf(name, sizeof(name), "kvm-vcpu-stats:%d", vcpu->vcpu_id);
> > +
> > +     error = get_unused_fd_flags(O_CLOEXEC);
> > +     if (error < 0)
> > +             return error;
> > +     fd = error;
> > +
> > +     file = anon_inode_getfile(name, &kvm_vcpu_stats_fops, vcpu, O_RDONLY);
> > +     if (IS_ERR(file)) {
> > +             error = PTR_ERR(file);
> > +             goto err_put_unused_fd;
> > +     }
> > +     file->f_mode |= FMODE_PREAD;
> > +     fd_install(fd, file);
> > +
> > +     return fd;
> > +
> > +err_put_unused_fd:
> > +     put_unused_fd(fd);
> > +     return error;
> > +}
> > +
> >   static long kvm_vcpu_ioctl(struct file *filp,
> >                          unsigned int ioctl, unsigned long arg)
> >   {
> > @@ -3606,6 +3720,10 @@ static long kvm_vcpu_ioctl(struct file *filp,
> >               r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
> >               break;
> >       }
> > +     case KVM_STATS_GETFD: {
> > +             r = kvm_vcpu_ioctl_get_statsfd(vcpu);
> > +             break;
> > +     }
> >       default:
> >               r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
> >       }
> > @@ -3864,6 +3982,8 @@ static long kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg)
> >   #else
> >               return 0;
> >   #endif
> > +     case KVM_CAP_STATS_BINARY_FD:
> > +             return 1;
> >       default:
> >               break;
> >       }
> > @@ -3967,6 +4087,48 @@ static int kvm_vm_ioctl_enable_cap_generic(struct kvm *kvm,
> >       }
> >   }
> >
> > +static ssize_t kvm_vm_stats_read(struct file *file, char __user *user_buffer,
> > +                           size_t size, loff_t *offset)
> > +{
> > +     char id[KVM_STATS_ID_MAXLEN];
> > +     struct kvm *kvm = file->private_data;
> > +
> > +     snprintf(id, sizeof(id), "kvm-%d", task_pid_nr(current));
> > +     return kvm_stats_read(id, &kvm_vm_stats_header, &kvm_vm_stats_desc[0],
> > +             &kvm->stat, sizeof(kvm->stat), user_buffer, size, offset);
> > +}
> > +
> > +static const struct file_operations kvm_vm_stats_fops = {
> > +     .read = kvm_vm_stats_read,
> > +     .llseek = noop_llseek,
> > +};
> > +
> > +static int kvm_vm_ioctl_get_statsfd(struct kvm *kvm)
> > +{
> > +     int error, fd;
> > +     struct file *file;
> > +
> > +     error = get_unused_fd_flags(O_CLOEXEC);
> > +     if (error < 0)
> > +             return error;
> > +     fd = error;
>
>
> Why not just do,
>
>              fd = get_unused_fd_flags(O_CLOEXEC);
>              if (fd < 0)
>                      return fd;
>
> ?
>
Good point. Will do.
> > +
> > +     file = anon_inode_getfile("kvm-vm-stats",
> > +                     &kvm_vm_stats_fops, kvm, O_RDONLY);
> > +     if (IS_ERR(file)) {
> > +             error = PTR_ERR(file);
> > +             goto err_put_unused_fd;
>
>
> Here, we can do,
>
>                 if (IS_ERR(file)) {
>
>                      put_unused_fd(fd);
>
>                      return (PTR_ERR(file));
>
>                  }
>
> and won't need a goto statement.
>
> Same comment for kvm_vcpu_ioctl_get_statsfd().
>
Nice. Will do.
> > +     }
> > +     file->f_mode |= FMODE_PREAD;
> > +     fd_install(fd, file);
> > +
> > +     return fd;
> > +
> > +err_put_unused_fd:
> > +     put_unused_fd(fd);
> > +     return error;
> > +}
> > +
> >   static long kvm_vm_ioctl(struct file *filp,
> >                          unsigned int ioctl, unsigned long arg)
> >   {
> > @@ -4149,6 +4311,9 @@ static long kvm_vm_ioctl(struct file *filp,
> >       case KVM_RESET_DIRTY_RINGS:
> >               r = kvm_vm_ioctl_reset_dirty_pages(kvm);
> >               break;
> > +     case KVM_STATS_GETFD:
>
>
> This should be named KVM_GET_STATS_FD.  For example, we have names like
> KVM_GET_DIRTY_LOG etc.
>
> Same comment for KVM_STATS_GETFD.
>
Makes sense. Will do.
> > +             r = kvm_vm_ioctl_get_statsfd(kvm);
>
>
> It's probably more readable if we call it kvm_vm_ioctl_get_stats_fd().
>
Yep. Will do.
> > +             break;
> >       default:
> >               r = kvm_arch_vm_ioctl(filp, ioctl, arg);
> >       }

Thanks,
Jing

Re: [PATCH v6 2/4] KVM: stats: Add fd-based API to read binary stats data

[Jing Zhang]

Hi Krish,

On Wed, May 26, 2021 at 1:53 PM Krish Sadhukhan
<krish.sadhukhan@oracle.com> wrote:
>
>
> On 5/24/21 8:18 AM, Jing Zhang wrote:
> > Provides a file descriptor per VM to read VM stats info/data.
> > Provides a file descriptor per vCPU to read vCPU stats info/data.
> >
> > Reviewed-by: David Matlack<dmatlack@google.com>
> > Reviewed-by: Ricardo Koller<ricarkol@google.com>
> > Signed-off-by: Jing Zhang<jingzhangos@google.com>
> > ---
> >   arch/arm64/kvm/guest.c    |  26 ++++++
> >   arch/mips/kvm/mips.c      |  52 ++++++++++++
> >   arch/powerpc/kvm/book3s.c |  52 ++++++++++++
> >   arch/powerpc/kvm/booke.c  |  45 +++++++++++
> >   arch/s390/kvm/kvm-s390.c  | 117 +++++++++++++++++++++++++++
> >   arch/x86/kvm/x86.c        |  53 ++++++++++++
> >   include/linux/kvm_host.h  | 132 ++++++++++++++++++++++++++++++
> >   include/uapi/linux/kvm.h  |  50 ++++++++++++
> >   virt/kvm/kvm_main.c       | 165 ++++++++++++++++++++++++++++++++++++++
> >   9 files changed, 692 insertions(+)
> >
> > diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
> > index 0e41331b0911..1cc1d83630ac 100644
> > --- a/arch/arm64/kvm/guest.c
> > +++ b/arch/arm64/kvm/guest.c
> > @@ -28,6 +28,32 @@
> >
> >   #include "trace.h"
> >
> > +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC();
> > +
> > +struct _kvm_stats_header kvm_vm_stats_header = {
> > +     .name_size = KVM_STATS_NAME_LEN,
> > +     .count = ARRAY_SIZE(kvm_vm_stats_desc),
> > +     .desc_offset = sizeof(struct kvm_stats_header),
> > +     .data_offset = sizeof(struct kvm_stats_header) +
> > +             sizeof(kvm_vm_stats_desc),
> > +};
> > +
> > +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
> > +     STATS_DESC_COUNTER("hvc_exit_stat"),
> > +     STATS_DESC_COUNTER("wfe_exit_stat"),
> > +     STATS_DESC_COUNTER("wfi_exit_stat"),
> > +     STATS_DESC_COUNTER("mmio_exit_user"),
> > +     STATS_DESC_COUNTER("mmio_exit_kernel"),
> > +     STATS_DESC_COUNTER("exits"));
> > +
> > +struct _kvm_stats_header kvm_vcpu_stats_header = {
> > +     .name_size = KVM_STATS_NAME_LEN,
> > +     .count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> > +     .desc_offset = sizeof(struct kvm_stats_header),
> > +     .data_offset = sizeof(struct kvm_stats_header) +
> > +             sizeof(kvm_vcpu_stats_desc),
> > +};
> > +
> >   struct kvm_stats_debugfs_item debugfs_entries[] = {
> >       VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> >       VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll), diff --git a/arch/mips/kvm/mips.c
> > b/arch/mips/kvm/mips.c index f4fc60c05e9c..f17a65743ccd 100644 ---
> > a/arch/mips/kvm/mips.c +++ b/arch/mips/kvm/mips.c @@ -38,6 +38,58 @@
> > #define VECTORSPACING 0x100 /* for EI/VI mode */ #endif +struct
> > _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(); +
> > +struct _kvm_stats_header kvm_vm_stats_header = { + .name_size =
> > KVM_STATS_NAME_LEN, + .count = ARRAY_SIZE(kvm_vm_stats_desc), +
> > .desc_offset = sizeof(struct kvm_stats_header), + .data_offset =
> > sizeof(struct kvm_stats_header) + + sizeof(kvm_vm_stats_desc), +}; +
> > +struct _kvm_stats_desc kvm_vcpu_stats_desc[] =
> > DEFINE_VCPU_STATS_DESC( + STATS_DESC_COUNTER("wait_exits"),
> > +     STATS_DESC_COUNTER("cache_exits"),
> > +     STATS_DESC_COUNTER("signal_exits"),
> > +     STATS_DESC_COUNTER("int_exits"),
> > +     STATS_DESC_COUNTER("cop_unusable_exits"),
> > +     STATS_DESC_COUNTER("tlbmod_exits"),
> > +     STATS_DESC_COUNTER("tlbmiss_ld_exits"),
> > +     STATS_DESC_COUNTER("tlbmiss_st_exits"),
> > +     STATS_DESC_COUNTER("addrerr_st_exits"),
> > +     STATS_DESC_COUNTER("addrerr_ld_exits"),
> > +     STATS_DESC_COUNTER("syscall_exits"),
> > +     STATS_DESC_COUNTER("resvd_inst_exits"),
> > +     STATS_DESC_COUNTER("break_inst_exits"),
> > +     STATS_DESC_COUNTER("trap_inst_exits"),
> > +     STATS_DESC_COUNTER("msa_fpe_exits"),
> > +     STATS_DESC_COUNTER("fpe_exits"),
> > +     STATS_DESC_COUNTER("msa_disabled_exits"),
> > +     STATS_DESC_COUNTER("flush_dcache_exits"),
> > +#ifdef CONFIG_KVM_MIPS_VZ
> > +     STATS_DESC_COUNTER("vz_gpsi_exits"),
> > +     STATS_DESC_COUNTER("vz_gsfc_exits"),
> > +     STATS_DESC_COUNTER("vz_hc_exits"),
> > +     STATS_DESC_COUNTER("vz_grr_exits"),
> > +     STATS_DESC_COUNTER("vz_gva_exits"),
> > +     STATS_DESC_COUNTER("vz_ghfc_exits"),
> > +     STATS_DESC_COUNTER("vz_gpa_exits"),
> > +     STATS_DESC_COUNTER("vz_resvd_exits"),
> > +#ifdef CONFIG_CPU_LOONGSON64
> > +     STATS_DESC_COUNTER("vz_cpucfg_exits"),
> > +#endif
> > +#endif
> > +     );
> > +
> > +struct _kvm_stats_header kvm_vcpu_stats_header = {
> > +     .name_size = KVM_STATS_NAME_LEN,
> > +     .count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> > +     .desc_offset = sizeof(struct kvm_stats_header),
> > +     .data_offset = sizeof(struct kvm_stats_header) +
> > +             sizeof(kvm_vcpu_stats_desc),
> > +};
> > +
> >   struct kvm_stats_debugfs_item debugfs_entries[] = {
> >       VCPU_STAT("wait", wait_exits),
> >       VCPU_STAT("cache", cache_exits),
> > diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
> > index bd3a10e1fdaf..5e8ee0d39ef9 100644
> > --- a/arch/powerpc/kvm/book3s.c
> > +++ b/arch/powerpc/kvm/book3s.c
> > @@ -38,6 +38,58 @@
> >
> >   /* #define EXIT_DEBUG */
> >
> > +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(
> > +     STATS_DESC_ICOUNTER("num_2M_pages"),
> > +     STATS_DESC_ICOUNTER("num_1G_pages"));
> > +
> > +struct _kvm_stats_header kvm_vm_stats_header = {
> > +     .name_size = KVM_STATS_NAME_LEN,
> > +     .count = ARRAY_SIZE(kvm_vm_stats_desc),
> > +     .desc_offset = sizeof(struct kvm_stats_header),
> > +     .data_offset = sizeof(struct kvm_stats_header) +
> > +             sizeof(kvm_vm_stats_desc),
> > +};
> > +
> > +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
> > +     STATS_DESC_COUNTER("sum_exits"),
> > +     STATS_DESC_COUNTER("mmio_exits"),
> > +     STATS_DESC_COUNTER("signal_exits"),
> > +     STATS_DESC_COUNTER("light_exits"),
> > +     STATS_DESC_COUNTER("itlb_real_miss_exits"),
> > +     STATS_DESC_COUNTER("itlb_virt_miss_exits"),
> > +     STATS_DESC_COUNTER("dtlb_real_miss_exits"),
> > +     STATS_DESC_COUNTER("dtlb_virt_miss_exits"),
> > +     STATS_DESC_COUNTER("syscall_exits"),
> > +     STATS_DESC_COUNTER("isi_exits"),
> > +     STATS_DESC_COUNTER("dsi_exits"),
> > +     STATS_DESC_COUNTER("emulated_inst_exits"),
> > +     STATS_DESC_COUNTER("dec_exits"),
> > +     STATS_DESC_COUNTER("ext_intr_exits"),
> > +     STATS_DESC_TIME_NSEC("halt_wait_ns"),
> > +     STATS_DESC_COUNTER("halt_successful_wait"),
> > +     STATS_DESC_COUNTER("dbell_exits"),
> > +     STATS_DESC_COUNTER("gdbell_exits"),
> > +     STATS_DESC_COUNTER("ld"),
> > +     STATS_DESC_COUNTER("st"),
> > +     STATS_DESC_COUNTER("pf_storage"),
> > +     STATS_DESC_COUNTER("pf_instruc"),
> > +     STATS_DESC_COUNTER("sp_storage"),
> > +     STATS_DESC_COUNTER("sp_instruc"),
> > +     STATS_DESC_COUNTER("queue_intr"),
> > +     STATS_DESC_COUNTER("ld_slow"),
> > +     STATS_DESC_COUNTER("st_slow"),
> > +     STATS_DESC_COUNTER("pthru_all"),
> > +     STATS_DESC_COUNTER("pthru_host"),
> > +     STATS_DESC_COUNTER("pthru_bad_aff"));
> > +
> > +struct _kvm_stats_header kvm_vcpu_stats_header = {
> > +     .name_size = KVM_STATS_NAME_LEN,
> > +     .count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> > +     .desc_offset = sizeof(struct kvm_stats_header),
> > +     .data_offset = sizeof(struct kvm_stats_header) +
> > +             sizeof(kvm_vcpu_stats_desc),
> > +};
> > +
> >   struct kvm_stats_debugfs_item debugfs_entries[] = {
> >       VCPU_STAT("exits", sum_exits),
> >       VCPU_STAT("mmio", mmio_exits),
> > diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
> > index 07fdd7a1254a..86d221e9193e 100644
> > --- a/arch/powerpc/kvm/booke.c
> > +++ b/arch/powerpc/kvm/booke.c
> > @@ -36,6 +36,51 @@
> >
> >   unsigned long kvmppc_booke_handlers;
> >
> > +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(
> > +     STATS_DESC_ICOUNTER("num_2M_pages"),
> > +     STATS_DESC_ICOUNTER("num_1G_pages"));
> > +
> > +struct _kvm_stats_header kvm_vm_stats_header = {
> > +     .name_size = KVM_STATS_NAME_LEN,
> > +     .count = ARRAY_SIZE(kvm_vm_stats_desc),
> > +     .desc_offset = sizeof(struct kvm_stats_header),
> > +     .data_offset = sizeof(struct kvm_stats_header) +
> > +             sizeof(kvm_vm_stats_desc),
> > +};
> > +
> > +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
> > +     STATS_DESC_COUNTER("sum_exits"),
> > +     STATS_DESC_COUNTER("mmio_exits"),
> > +     STATS_DESC_COUNTER("signal_exits"),
> > +     STATS_DESC_COUNTER("light_exits"),
> > +     STATS_DESC_COUNTER("itlb_real_miss_exits"),
> > +     STATS_DESC_COUNTER("itlb_virt_miss_exits"),
> > +     STATS_DESC_COUNTER("dtlb_real_miss_exits"),
> > +     STATS_DESC_COUNTER("dtlb_virt_miss_exits"),
> > +     STATS_DESC_COUNTER("syscall_exits"),
> > +     STATS_DESC_COUNTER("isi_exits"),
> > +     STATS_DESC_COUNTER("dsi_exits"),
> > +     STATS_DESC_COUNTER("emulated_inst_exits"),
> > +     STATS_DESC_COUNTER("dec_exits"),
> > +     STATS_DESC_COUNTER("ext_intr_exits"),
> > +     STATS_DESC_TIME_NSEC("halt_wait_ns"),
> > +     STATS_DESC_COUNTER("halt_successful_wait"),
> > +     STATS_DESC_COUNTER("dbell_exits"),
> > +     STATS_DESC_COUNTER("gdbell_exits"),
> > +     STATS_DESC_COUNTER("ld"),
> > +     STATS_DESC_COUNTER("st"),
> > +     STATS_DESC_COUNTER("pthru_all"),
> > +     STATS_DESC_COUNTER("pthru_host"),
> > +     STATS_DESC_COUNTER("pthru_bad_aff"));
> > +
> > +struct _kvm_stats_header kvm_vcpu_stats_header = {
> > +     .name_size = KVM_STATS_NAME_LEN,
> > +     .count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> > +     .desc_offset = sizeof(struct kvm_stats_header),
> > +     .data_offset = sizeof(struct kvm_stats_header) +
> > +             sizeof(kvm_vcpu_stats_desc),
> > +};
> > +
> >   struct kvm_stats_debugfs_item debugfs_entries[] = {
> >       VCPU_STAT("mmio", mmio_exits),
> >       VCPU_STAT("sig", signal_exits),
> > diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> > index d6bf3372bb10..003feee79fce 100644
> > --- a/arch/s390/kvm/kvm-s390.c
> > +++ b/arch/s390/kvm/kvm-s390.c
> > @@ -58,6 +58,123 @@
> >   #define VCPU_IRQS_MAX_BUF (sizeof(struct kvm_s390_irq) * \
> >                          (KVM_MAX_VCPUS + LOCAL_IRQS))
> >
> > +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(
> > +     STATS_DESC_COUNTER("inject_io"),
> > +     STATS_DESC_COUNTER("inject_float_mchk"),
> > +     STATS_DESC_COUNTER("inject_pfault_done"),
> > +     STATS_DESC_COUNTER("inject_service_signal"),
> > +     STATS_DESC_COUNTER("inject_virtio"));
> > +
> > +struct _kvm_stats_header kvm_vm_stats_header = {
> > +     .name_size = KVM_STATS_NAME_LEN,
> > +     .count = ARRAY_SIZE(kvm_vm_stats_desc),
> > +     .desc_offset = sizeof(struct kvm_stats_header),
> > +     .data_offset = sizeof(struct kvm_stats_header) +
> > +             sizeof(kvm_vm_stats_desc),
> > +};
> > +
> > +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
> > +     STATS_DESC_COUNTER("exit_userspace"),
> > +     STATS_DESC_COUNTER("exit_null"),
> > +     STATS_DESC_COUNTER("exit_external_request"),
> > +     STATS_DESC_COUNTER("exit_io_request"),
> > +     STATS_DESC_COUNTER("exit_external_interrupt"),
> > +     STATS_DESC_COUNTER("exit_stop_request"),
> > +     STATS_DESC_COUNTER("exit_validity"),
> > +     STATS_DESC_COUNTER("exit_instruction"),
> > +     STATS_DESC_COUNTER("exit_pei"),
> > +     STATS_DESC_COUNTER("halt_no_poll_steal"),
> > +     STATS_DESC_COUNTER("instruction_lctl"),
> > +     STATS_DESC_COUNTER("instruction_lctlg"),
> > +     STATS_DESC_COUNTER("instruction_stctl"),
> > +     STATS_DESC_COUNTER("instruction_stctg"),
> > +     STATS_DESC_COUNTER("exit_program_interruption"),
> > +     STATS_DESC_COUNTER("exit_instr_and_program"),
> > +     STATS_DESC_COUNTER("exit_operation_exception"),
> > +     STATS_DESC_COUNTER("deliver_ckc"),
> > +     STATS_DESC_COUNTER("deliver_cputm"),
> > +     STATS_DESC_COUNTER("deliver_external_call"),
> > +     STATS_DESC_COUNTER("deliver_emergency_signal"),
> > +     STATS_DESC_COUNTER("deliver_service_signal"),
> > +     STATS_DESC_COUNTER("deliver_virtio"),
> > +     STATS_DESC_COUNTER("deliver_stop_signal"),
> > +     STATS_DESC_COUNTER("deliver_prefix_signal"),
> > +     STATS_DESC_COUNTER("deliver_restart_signal"),
> > +     STATS_DESC_COUNTER("deliver_program"),
> > +     STATS_DESC_COUNTER("deliver_io"),
> > +     STATS_DESC_COUNTER("deliver_machine_check"),
> > +     STATS_DESC_COUNTER("exit_wait_state"),
> > +     STATS_DESC_COUNTER("inject_ckc"),
> > +     STATS_DESC_COUNTER("inject_cputm"),
> > +     STATS_DESC_COUNTER("inject_external_call"),
> > +     STATS_DESC_COUNTER("inject_emergency_signal"),
> > +     STATS_DESC_COUNTER("inject_mchk"),
> > +     STATS_DESC_COUNTER("inject_pfault_init"),
> > +     STATS_DESC_COUNTER("inject_program"),
> > +     STATS_DESC_COUNTER("inject_restart"),
> > +     STATS_DESC_COUNTER("inject_set_prefix"),
> > +     STATS_DESC_COUNTER("inject_stop_signal"),
> > +     STATS_DESC_COUNTER("instruction_epsw"),
> > +     STATS_DESC_COUNTER("instruction_gs"),
> > +     STATS_DESC_COUNTER("instruction_io_other"),
> > +     STATS_DESC_COUNTER("instruction_lpsw"),
> > +     STATS_DESC_COUNTER("instruction_lpswe"),
> > +     STATS_DESC_COUNTER("instruction_pfmf"),
> > +     STATS_DESC_COUNTER("instruction_ptff"),
> > +     STATS_DESC_COUNTER("instruction_sck"),
> > +     STATS_DESC_COUNTER("instruction_sckpf"),
> > +     STATS_DESC_COUNTER("instruction_stidp"),
> > +     STATS_DESC_COUNTER("instruction_spx"),
> > +     STATS_DESC_COUNTER("instruction_stpx"),
> > +     STATS_DESC_COUNTER("instruction_stap"),
> > +     STATS_DESC_COUNTER("instruction_iske"),
> > +     STATS_DESC_COUNTER("instruction_ri"),
> > +     STATS_DESC_COUNTER("instruction_rrbe"),
> > +     STATS_DESC_COUNTER("instruction_sske"),
> > +     STATS_DESC_COUNTER("instruction_ipte_interlock"),
> > +     STATS_DESC_COUNTER("instruction_stsi"),
> > +     STATS_DESC_COUNTER("instruction_stfl"),
> > +     STATS_DESC_COUNTER("instruction_tb"),
> > +     STATS_DESC_COUNTER("instruction_tpi"),
> > +     STATS_DESC_COUNTER("instruction_tprot"),
> > +     STATS_DESC_COUNTER("instruction_tsch"),
> > +     STATS_DESC_COUNTER("instruction_sie"),
> > +     STATS_DESC_COUNTER("instruction_essa"),
> > +     STATS_DESC_COUNTER("instruction_sthyi"),
> > +     STATS_DESC_COUNTER("instruction_sigp_sense"),
> > +     STATS_DESC_COUNTER("instruction_sigp_sense_running"),
> > +     STATS_DESC_COUNTER("instruction_sigp_external_call"),
> > +     STATS_DESC_COUNTER("instruction_sigp_emergency"),
> > +     STATS_DESC_COUNTER("instruction_sigp_cond_emergency"),
> > +     STATS_DESC_COUNTER("instruction_sigp_start"),
> > +     STATS_DESC_COUNTER("instruction_sigp_stop"),
> > +     STATS_DESC_COUNTER("instruction_sigp_stop_store_status"),
> > +     STATS_DESC_COUNTER("instruction_sigp_store_status"),
> > +     STATS_DESC_COUNTER("instruction_sigp_store_adtl_status"),
> > +     STATS_DESC_COUNTER("instruction_sigp_arch"),
> > +     STATS_DESC_COUNTER("instruction_sigp_prefix"),
> > +     STATS_DESC_COUNTER("instruction_sigp_restart"),
> > +     STATS_DESC_COUNTER("instruction_sigp_init_cpu_reset"),
> > +     STATS_DESC_COUNTER("instruction_sigp_cpu_reset"),
> > +     STATS_DESC_COUNTER("instruction_sigp_unknown"),
> > +     STATS_DESC_COUNTER("diagnose_10"),
> > +     STATS_DESC_COUNTER("diagnose_44"),
> > +     STATS_DESC_COUNTER("diagnose_9c"),
> > +     STATS_DESC_COUNTER("diagnose_9c_ignored"),
> > +     STATS_DESC_COUNTER("diagnose_258"),
> > +     STATS_DESC_COUNTER("diagnose_308"),
> > +     STATS_DESC_COUNTER("diagnose_500"),
> > +     STATS_DESC_COUNTER("diagnose_other"),
> > +     STATS_DESC_COUNTER("pfault_sync"));
> > +
> > +struct _kvm_stats_header kvm_vcpu_stats_header = {
> > +     .name_size = KVM_STATS_NAME_LEN,
> > +     .count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> > +     .desc_offset = sizeof(struct kvm_stats_header),
> > +     .data_offset = sizeof(struct kvm_stats_header) +
> > +             sizeof(kvm_vcpu_stats_desc),
> > +};
> > +
> >   struct kvm_stats_debugfs_item debugfs_entries[] = {
> >       VCPU_STAT("userspace_handled", exit_userspace),
> >       VCPU_STAT("exit_null", exit_null),
> > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> > index 9a93d80caff6..84880687c199 100644
> > --- a/arch/x86/kvm/x86.c
> > +++ b/arch/x86/kvm/x86.c
> > @@ -214,6 +214,59 @@ EXPORT_SYMBOL_GPL(host_xss);
> >   u64 __read_mostly supported_xss;
> >   EXPORT_SYMBOL_GPL(supported_xss);
> >
> > +struct _kvm_stats_desc kvm_vm_stats_desc[] = DEFINE_VM_STATS_DESC(
> > +     STATS_DESC_COUNTER("mmu_shadow_zapped"),
> > +     STATS_DESC_COUNTER("mmu_pte_write"),
> > +     STATS_DESC_COUNTER("mmu_pde_zapped"),
> > +     STATS_DESC_COUNTER("mmu_flooded"),
> > +     STATS_DESC_COUNTER("mmu_recycled"),
> > +     STATS_DESC_COUNTER("mmu_cache_miss"),
> > +     STATS_DESC_ICOUNTER("mmu_unsync"),
> > +     STATS_DESC_ICOUNTER("largepages"),
> > +     STATS_DESC_ICOUNTER("nx_largepages_splits"),
> > +     STATS_DESC_ICOUNTER("max_mmu_page_hash_collisions"));
> > +
> > +struct _kvm_stats_header kvm_vm_stats_header = {
> > +     .name_size = KVM_STATS_NAME_LEN,
> > +     .count = ARRAY_SIZE(kvm_vm_stats_desc),
> > +     .desc_offset = sizeof(struct kvm_stats_header),
> > +     .data_offset = sizeof(struct kvm_stats_header) +
> > +             sizeof(kvm_vm_stats_desc),
> > +};
> > +
> > +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = DEFINE_VCPU_STATS_DESC(
> > +     STATS_DESC_COUNTER("pf_fixed"),
> > +     STATS_DESC_COUNTER("pf_guest"),
> > +     STATS_DESC_COUNTER("tlb_flush"),
> > +     STATS_DESC_COUNTER("invlpg"),
> > +     STATS_DESC_COUNTER("exits"),
> > +     STATS_DESC_COUNTER("io_exits"),
> > +     STATS_DESC_COUNTER("mmio_exits"),
> > +     STATS_DESC_COUNTER("signal_exits"),
> > +     STATS_DESC_COUNTER("irq_window_exits"),
> > +     STATS_DESC_COUNTER("nmi_window_exits"),
> > +     STATS_DESC_COUNTER("l1d_flush"),
> > +     STATS_DESC_COUNTER("halt_exits"),
> > +     STATS_DESC_COUNTER("request_irq_exits"),
> > +     STATS_DESC_COUNTER("irq_exits"),
> > +     STATS_DESC_COUNTER("host_state_reload"),
> > +     STATS_DESC_COUNTER("fpu_reload"),
> > +     STATS_DESC_COUNTER("insn_emulation"),
> > +     STATS_DESC_COUNTER("insn_emulation_fail"),
> > +     STATS_DESC_COUNTER("hypercalls"),
> > +     STATS_DESC_COUNTER("irq_injections"),
> > +     STATS_DESC_COUNTER("nmi_injections"),
> > +     STATS_DESC_COUNTER("req_event"),
> > +     STATS_DESC_COUNTER("nested_run"));
> > +
> > +struct _kvm_stats_header kvm_vcpu_stats_header = {
> > +     .name_size = KVM_STATS_NAME_LEN,
> > +     .count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> > +     .desc_offset = sizeof(struct kvm_stats_header),
> > +     .data_offset = sizeof(struct kvm_stats_header) +
> > +             sizeof(kvm_vcpu_stats_desc),
> > +};
> > +
> >   struct kvm_stats_debugfs_item debugfs_entries[] = {
> >       VCPU_STAT("pf_fixed", pf_fixed),
> >       VCPU_STAT("pf_guest", pf_guest),
> > diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> > index 97700e41db3b..c0a8e6ddc745 100644
> > --- a/include/linux/kvm_host.h
> > +++ b/include/linux/kvm_host.h
> > @@ -1240,6 +1240,19 @@ struct kvm_stats_debugfs_item {
> >       int mode;
> >   };
> >
> > +struct _kvm_stats_header {
> > +     __u32 name_size;
> > +     __u32 count;
> > +     __u32 desc_offset;
> > +     __u32 data_offset;
> > +};
> > +
> > +#define KVM_STATS_NAME_LEN   48
> > +struct _kvm_stats_desc {
> > +     struct kvm_stats_desc desc;
> > +     char name[KVM_STATS_NAME_LEN];
> > +};
> > +
> >   #define KVM_DBGFS_GET_MODE(dbgfs_item)                                         \
> >       ((dbgfs_item)->mode ? (dbgfs_item)->mode : 0644)
> >
> > @@ -1253,8 +1266,127 @@ struct kvm_stats_debugfs_item {
> >       { n, offsetof(struct kvm_vcpu, stat.common.x),                         \
> >         KVM_STAT_VCPU, ## __VA_ARGS__ }
> >
> > +#define STATS_DESC(stat, type, unit, scale, exp)                            \
> > +     {                                                                      \
> > +             {                                                              \
> > +                     .flags = type | unit | scale,                          \
> > +                     .exponent = exp,                                       \
> > +                     .size = 1                                              \
> > +             },                                                             \
> > +             .name = stat,                                                  \
> > +     }
> > +#define STATS_DESC_CUMULATIVE(name, unit, scale, exponent)                  \
> > +     STATS_DESC(name, KVM_STATS_TYPE_CUMULATIVE, unit, scale, exponent)
> > +#define STATS_DESC_INSTANT(name, unit, scale, exponent)                             \
> > +     STATS_DESC(name, KVM_STATS_TYPE_INSTANT, unit, scale, exponent)
> > +
> > +/* Cumulative counter */
> > +#define STATS_DESC_COUNTER(name)                                            \
> > +     STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_NONE,                       \
> > +             KVM_STATS_BASE_POW10, 0)
> > +/* Instantaneous counter */
> > +#define STATS_DESC_ICOUNTER(name)                                           \
> > +     STATS_DESC_INSTANT(name, KVM_STATS_UNIT_NONE,                          \
> > +             KVM_STATS_BASE_POW10, 0)
> > +
> > +/* Cumulative clock cycles */
> > +#define STATS_DESC_CYCLE(name)                                                      \
> > +     STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_CYCLES,                     \
> > +             KVM_STATS_BASE_POW10, 0)
> > +/* Instantaneous clock cycles */
> > +#define STATS_DESC_ICYCLE(name)                                                     \
> > +     STATS_DESC_INSTANT(name, KVM_STATS_UNIT_CYCLES,                        \
> > +             KVM_STATS_BASE_POW10, 0)
> > +
> > +/* Cumulative memory size in Byte */
> > +#define STATS_DESC_SIZE_BYTE(name)                                          \
> > +     STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES,                      \
> > +             KVM_STATS_BASE_POW2, 0)
> > +/* Cumulative memory size in KiByte */
> > +#define STATS_DESC_SIZE_KBYTE(name)                                         \
> > +     STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES,                      \
> > +             KVM_STATS_BASE_POW2, 10)
> > +/* Cumulative memory size in MiByte */
> > +#define STATS_DESC_SIZE_MBYTE(name)                                         \
> > +     STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES,                      \
> > +             KVM_STATS_BASE_POW2, 20)
> > +/* Cumulative memory size in GiByte */
> > +#define STATS_DESC_SIZE_GBYTE(name)                                         \
> > +     STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES,                      \
> > +             KVM_STATS_BASE_POW2, 30)
> > +
> > +/* Instantaneous memory size in Byte */
> > +#define STATS_DESC_ISIZE_BYTE(name)                                         \
> > +     STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES,                         \
> > +             KVM_STATS_BASE_POW2, 0)
> > +/* Instantaneous memory size in KiByte */
> > +#define STATS_DESC_ISIZE_KBYTE(name)                                        \
> > +     STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES,                         \
> > +             KVM_STATS_BASE_POW2, 10)
> > +/* Instantaneous memory size in MiByte */
> > +#define STATS_DESC_ISIZE_MBYTE(name)                                        \
> > +     STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES,                         \
> > +             KVM_STATS_BASE_POW2, 20)
> > +/* Instantaneous memory size in GiByte */
> > +#define STATS_DESC_ISIZE_GBYTE(name)                                        \
> > +     STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES,                         \
> > +             KVM_STATS_BASE_POW2, 30)
> > +
> > +/* Cumulative time in second */
> > +#define STATS_DESC_TIME_SEC(name)                                           \
> > +     STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS,                    \
> > +             KVM_STATS_BASE_POW10, 0)
> > +/* Cumulative time in millisecond */
> > +#define STATS_DESC_TIME_MSEC(name)                                          \
> > +     STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS,                    \
> > +             KVM_STATS_BASE_POW10, -3)
> > +/* Cumulative time in microsecond */
> > +#define STATS_DESC_TIME_USEC(name)                                          \
> > +     STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS,                    \
> > +             KVM_STATS_BASE_POW10, -6)
> > +/* Cumulative time in nanosecond */
> > +#define STATS_DESC_TIME_NSEC(name)                                          \
> > +     STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS,                    \
> > +             KVM_STATS_BASE_POW10, -9)
> > +
> > +/* Instantaneous time in second */
> > +#define STATS_DESC_ITIME_SEC(name)                                          \
> > +     STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS,                       \
> > +             KVM_STATS_BASE_POW10, 0)
> > +/* Instantaneous time in millisecond */
> > +#define STATS_DESC_ITIME_MSEC(name)                                         \
> > +     STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS,                       \
> > +             KVM_STATS_BASE_POW10, -3)
> > +/* Instantaneous time in microsecond */
> > +#define STATS_DESC_ITIME_USEC(name)                                         \
> > +     STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS,                       \
> > +             KVM_STATS_BASE_POW10, -6)
> > +/* Instantaneous time in nanosecond */
> > +#define STATS_DESC_ITIME_NSEC(name)                                         \
> > +     STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS,                       \
> > +             KVM_STATS_BASE_POW10, -9)
> > +
> > +#define DEFINE_VM_STATS_DESC(...) {                                         \
> > +     STATS_DESC_COUNTER("remote_tlb_flush"),                                \
> > +     ## __VA_ARGS__                                                         \
> > +}
> > +
> > +#define DEFINE_VCPU_STATS_DESC(...) {                                               \
> > +     STATS_DESC_COUNTER("halt_successful_poll"),                            \
> > +     STATS_DESC_COUNTER("halt_attempted_poll"),                             \
> > +     STATS_DESC_COUNTER("halt_poll_invalid"),                               \
> > +     STATS_DESC_COUNTER("halt_wakeup"),                                     \
> > +     STATS_DESC_TIME_NSEC("halt_poll_success_ns"),                          \
> > +     STATS_DESC_TIME_NSEC("halt_poll_fail_ns"),                             \
> > +     ## __VA_ARGS__                                                         \
> > +}
> > +
> >   extern struct kvm_stats_debugfs_item debugfs_entries[];
> >   extern struct dentry *kvm_debugfs_dir;
> > +extern struct _kvm_stats_header kvm_vm_stats_header;
> > +extern struct _kvm_stats_header kvm_vcpu_stats_header;
> > +extern struct _kvm_stats_desc kvm_vm_stats_desc[];
> > +extern struct _kvm_stats_desc kvm_vcpu_stats_desc[];
> >
> >   #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
> >   static inline int mmu_notifier_retry(struct kvm *kvm, unsigned long mmu_seq)
> > diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
> > index 3fd9a7e9d90c..82db825c392c 100644
> > --- a/include/uapi/linux/kvm.h
> > +++ b/include/uapi/linux/kvm.h
> > @@ -1082,6 +1082,7 @@ struct kvm_ppc_resize_hpt {
> >   #define KVM_CAP_SGX_ATTRIBUTE 196
> >   #define KVM_CAP_VM_COPY_ENC_CONTEXT_FROM 197
> >   #define KVM_CAP_PTP_KVM 198
> > +#define KVM_CAP_STATS_BINARY_FD 199
> >
> >   #ifdef KVM_CAP_IRQ_ROUTING
> >
> > @@ -1898,4 +1899,53 @@ struct kvm_dirty_gfn {
> >   #define KVM_BUS_LOCK_DETECTION_OFF             (1 << 0)
> >   #define KVM_BUS_LOCK_DETECTION_EXIT            (1 << 1)
> >
> > +#define KVM_STATS_ID_MAXLEN          64
> > +
> > +struct kvm_stats_header {
> > +     char id[KVM_STATS_ID_MAXLEN];
> > +     __u32 name_size;
> > +     __u32 count;
> > +     __u32 desc_offset;
> > +     __u32 data_offset;
> > +};
> > +
> > +#define KVM_STATS_TYPE_SHIFT         0
> > +#define KVM_STATS_TYPE_MASK          (0xF << KVM_STATS_TYPE_SHIFT)
> > +#define KVM_STATS_TYPE_CUMULATIVE    (0x0 << KVM_STATS_TYPE_SHIFT)
> > +#define KVM_STATS_TYPE_INSTANT               (0x1 << KVM_STATS_TYPE_SHIFT)
> > +#define KVM_STATS_TYPE_MAX           KVM_STATS_TYPE_INSTANT
> > +
> > +#define KVM_STATS_UNIT_SHIFT         4
> > +#define KVM_STATS_UNIT_MASK          (0xF << KVM_STATS_UNIT_SHIFT)
> > +#define KVM_STATS_UNIT_NONE          (0x0 << KVM_STATS_UNIT_SHIFT)
> > +#define KVM_STATS_UNIT_BYTES         (0x1 << KVM_STATS_UNIT_SHIFT)
> > +#define KVM_STATS_UNIT_SECONDS               (0x2 << KVM_STATS_UNIT_SHIFT)
> > +#define KVM_STATS_UNIT_CYCLES                (0x3 << KVM_STATS_UNIT_SHIFT)
> > +#define KVM_STATS_UNIT_MAX           KVM_STATS_UNIT_CYCLES
> > +
> > +#define KVM_STATS_BASE_SHIFT         8
> > +#define KVM_STATS_BASE_MASK          (0xF << KVM_STATS_BASE_SHIFT)
> > +#define KVM_STATS_BASE_POW10         (0x0 << KVM_STATS_BASE_SHIFT)
> > +#define KVM_STATS_BASE_POW2          (0x1 << KVM_STATS_BASE_SHIFT)
> > +#define KVM_STATS_BASE_MAX           KVM_STATS_BASE_POW2
> > +
> > +struct kvm_stats_desc {
> > +     __u32 flags;
> > +     __s16 exponent;
> > +     __u16 size;
> > +     __u32 unused1;
> > +     __u32 unused2;
> > +     char name[0];
> > +};
> > +
> > +struct kvm_vm_stats_data {
> > +     unsigned long value[0];
> > +};
> > +
> > +struct kvm_vcpu_stats_data {
> > +     __u64 value[0];
> > +};
> > +
> > +#define KVM_STATS_GETFD  _IOR(KVMIO,  0xcc, struct kvm_stats_header)
> > +
> >   #endif /* __LINUX_KVM_H */
> > diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> > index 34a4cf265297..9e20e2ff78b4 100644
> > --- a/virt/kvm/kvm_main.c
> > +++ b/virt/kvm/kvm_main.c
> > @@ -3409,6 +3409,120 @@ static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
> >       return 0;
> >   }
> >
> > +static ssize_t kvm_stats_read(char *id, struct _kvm_stats_header *header,
> > +             struct _kvm_stats_desc *desc, void *stats, size_t size_stats,
> > +             char __user *user_buffer, size_t size, loff_t *offset)
> > +{
> > +     ssize_t copylen, len, remain = size;
> > +     size_t size_header, size_desc;
> > +     loff_t pos = *offset;
> > +     char __user *dest = user_buffer;
> > +     void *src;
> > +
> > +     size_header = sizeof(*header);
> > +     size_desc = header->count * sizeof(*desc);
> > +
> > +     len = KVM_STATS_ID_MAXLEN + size_header + size_desc + size_stats - pos;
> > +     len = min(len, remain);
> > +     if (len <= 0)
> > +             return 0;
> > +     remain = len;
> > +
> > +     /* Copy kvm stats header id string */
> > +     copylen = KVM_STATS_ID_MAXLEN - pos;
> > +     copylen = min(copylen, remain);
> > +     if (copylen > 0) {
> > +             src = id + pos;
> > +             if (copy_to_user(dest, src, copylen))
> > +                     return -EFAULT;
> > +             remain -= copylen;
> > +             pos += copylen;
> > +             dest += copylen;
> > +     }
> > +     /* Copy kvm stats header */
> > +     copylen = KVM_STATS_ID_MAXLEN + size_header - pos;
> > +     copylen = min(copylen, remain);
> > +     if (copylen > 0) {
> > +             src = header + pos - KVM_STATS_ID_MAXLEN;
> > +             if (copy_to_user(dest, src, copylen))
> > +                     return -EFAULT;
> > +             remain -= copylen;
> > +             pos += copylen;
> > +             dest += copylen;
> > +     }
> > +     /* Copy kvm stats descriptors */
> > +     copylen = header->desc_offset + size_desc - pos;
> > +     copylen = min(copylen, remain);
> > +     if (copylen > 0) {
> > +             src = desc + pos - header->desc_offset;
> > +             if (copy_to_user(dest, src, copylen))
> > +                     return -EFAULT;
> > +             remain -= copylen;
> > +             pos += copylen;
> > +             dest += copylen;
> > +     }
> > +     /* Copy kvm stats values */
> > +     copylen = header->data_offset + size_stats - pos;
> > +     copylen = min(copylen, remain);
> > +     if (copylen > 0) {
> > +             src = stats + pos - header->data_offset;
> > +             if (copy_to_user(dest, src, copylen))
> > +                     return -EFAULT;
> > +             remain -= copylen;
> > +             pos += copylen;
> > +             dest += copylen;
> > +     }
> > +
>
>
> Is it possible to re-use the 'if' portion either via a separate function
> ? For example,
>
> static int copy_data(void *src)
>
> {
>          if (copy_to_user(dest, src, copylen))
>              return -EFAULT;
>          remain -= copylen;
>          pos += copylen;
>          dest += copylen;
>          return 0;
>
> }
>
> and then calling it as,
>
>          if (copylen > 0)
>
>              copy_data(stats + pos - header->data_offset);
>
Not sure it is beneficial to add a separate function for this.
Besides src, we also need to pass the other three parameters,
remain, pos and dest. And we still need to check the return
value of copy_data.
> > +     *offset = pos;
> > +     return len;
> > +}
> > +
> > +static ssize_t kvm_vcpu_stats_read(struct file *file, char __user *user_buffer,
> > +                           size_t size, loff_t *offset)
> > +{
> > +     char id[KVM_STATS_ID_MAXLEN];
> > +     struct kvm_vcpu *vcpu = file->private_data;
> > +
> > +     snprintf(id, sizeof(id), "kvm-%d/vcpu-%d",
> > +                     task_pid_nr(current), vcpu->vcpu_id);
> > +     return kvm_stats_read(id, &kvm_vcpu_stats_header,
> > +                     &kvm_vcpu_stats_desc[0], &vcpu->stat,
> > +                     sizeof(vcpu->stat), user_buffer, size, offset);
> > +}
> > +
> > +static const struct file_operations kvm_vcpu_stats_fops = {
> > +     .read = kvm_vcpu_stats_read,
> > +     .llseek = noop_llseek,
> > +};
> > +
> > +static int kvm_vcpu_ioctl_get_statsfd(struct kvm_vcpu *vcpu)
> > +{
> > +     int error, fd;
> > +     struct file *file;
> > +     char name[15 + ITOA_MAX_LEN + 1];
> > +
> > +     snprintf(name, sizeof(name), "kvm-vcpu-stats:%d", vcpu->vcpu_id);
> > +
> > +     error = get_unused_fd_flags(O_CLOEXEC);
> > +     if (error < 0)
> > +             return error;
> > +     fd = error;
> > +
> > +     file = anon_inode_getfile(name, &kvm_vcpu_stats_fops, vcpu, O_RDONLY);
> > +     if (IS_ERR(file)) {
> > +             error = PTR_ERR(file);
> > +             goto err_put_unused_fd;
> > +     }
> > +     file->f_mode |= FMODE_PREAD;
> > +     fd_install(fd, file);
> > +
> > +     return fd;
> > +
> > +err_put_unused_fd:
> > +     put_unused_fd(fd);
> > +     return error;
> > +}
> > +
> >   static long kvm_vcpu_ioctl(struct file *filp,
> >                          unsigned int ioctl, unsigned long arg)
> >   {
> > @@ -3606,6 +3720,10 @@ static long kvm_vcpu_ioctl(struct file *filp,
> >               r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
> >               break;
> >       }
> > +     case KVM_STATS_GETFD: {
> > +             r = kvm_vcpu_ioctl_get_statsfd(vcpu);
> > +             break;
> > +     }
> >       default:
> >               r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
> >       }
> > @@ -3864,6 +3982,8 @@ static long kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg)
> >   #else
> >               return 0;
> >   #endif
> > +     case KVM_CAP_STATS_BINARY_FD:
> > +             return 1;
> >       default:
> >               break;
> >       }
> > @@ -3967,6 +4087,48 @@ static int kvm_vm_ioctl_enable_cap_generic(struct kvm *kvm,
> >       }
> >   }
> >
> > +static ssize_t kvm_vm_stats_read(struct file *file, char __user *user_buffer,
> > +                           size_t size, loff_t *offset)
> > +{
> > +     char id[KVM_STATS_ID_MAXLEN];
> > +     struct kvm *kvm = file->private_data;
> > +
> > +     snprintf(id, sizeof(id), "kvm-%d", task_pid_nr(current));
> > +     return kvm_stats_read(id, &kvm_vm_stats_header, &kvm_vm_stats_desc[0],
> > +             &kvm->stat, sizeof(kvm->stat), user_buffer, size, offset);
> > +}
> > +
> > +static const struct file_operations kvm_vm_stats_fops = {
> > +     .read = kvm_vm_stats_read,
> > +     .llseek = noop_llseek,
> > +};
> > +
> > +static int kvm_vm_ioctl_get_statsfd(struct kvm *kvm)
> > +{
> > +     int error, fd;
> > +     struct file *file;
> > +
> > +     error = get_unused_fd_flags(O_CLOEXEC);
> > +     if (error < 0)
> > +             return error;
> > +     fd = error;
>
>
> Why not just do,
>
>              fd = get_unused_fd_flags(O_CLOEXEC);
>              if (fd < 0)
>                      return fd;
>
> ?
>
Good point. Will do.
> > +
> > +     file = anon_inode_getfile("kvm-vm-stats",
> > +                     &kvm_vm_stats_fops, kvm, O_RDONLY);
> > +     if (IS_ERR(file)) {
> > +             error = PTR_ERR(file);
> > +             goto err_put_unused_fd;
>
>
> Here, we can do,
>
>                 if (IS_ERR(file)) {
>
>                      put_unused_fd(fd);
>
>                      return (PTR_ERR(file));
>
>                  }
>
> and won't need a goto statement.
>
> Same comment for kvm_vcpu_ioctl_get_statsfd().
>
Nice. Will do.
> > +     }
> > +     file->f_mode |= FMODE_PREAD;
> > +     fd_install(fd, file);
> > +
> > +     return fd;
> > +
> > +err_put_unused_fd:
> > +     put_unused_fd(fd);
> > +     return error;
> > +}
> > +
> >   static long kvm_vm_ioctl(struct file *filp,
> >                          unsigned int ioctl, unsigned long arg)
> >   {
> > @@ -4149,6 +4311,9 @@ static long kvm_vm_ioctl(struct file *filp,
> >       case KVM_RESET_DIRTY_RINGS:
> >               r = kvm_vm_ioctl_reset_dirty_pages(kvm);
> >               break;
> > +     case KVM_STATS_GETFD:
>
>
> This should be named KVM_GET_STATS_FD.  For example, we have names like
> KVM_GET_DIRTY_LOG etc.
>
> Same comment for KVM_STATS_GETFD.
>
Makes sense. Will do.
> > +             r = kvm_vm_ioctl_get_statsfd(kvm);
>
>
> It's probably more readable if we call it kvm_vm_ioctl_get_stats_fd().
>
Yep. Will do.
> > +             break;
> >       default:
> >               r = kvm_arch_vm_ioctl(filp, ioctl, arg);
> >       }

Thanks,
Jing
_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

[PATCH v6 3/4] KVM: stats: Add documentation for statistics data binary interface

[Jing Zhang]

Update KVM API documentation for binary statistics.

Reviewed-by: David Matlack <dmatlack@google.com>
Reviewed-by: Ricardo Koller <ricarkol@google.com>
Signed-off-by: Jing Zhang <jingzhangos@google.com>
---
 Documentation/virt/kvm/api.rst | 179 +++++++++++++++++++++++++++++++++
 1 file changed, 179 insertions(+)

diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
index 7fcb2fd38f42..5cedddd579b2 100644
--- a/Documentation/virt/kvm/api.rst
+++ b/Documentation/virt/kvm/api.rst
@@ -5034,6 +5034,177 @@ see KVM_XEN_VCPU_SET_ATTR above.
 The KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_ADJUST type may not be used
 with the KVM_XEN_VCPU_GET_ATTR ioctl.
 
+4.130 KVM_STATS_GETFD
+---------------------
+
+:Capability: KVM_CAP_STATS_BINARY_FD
+:Architectures: all
+:Type: vm ioctl, vcpu ioctl
+:Parameters: none
+:Returns: statistics file descriptor on success, < 0 on error
+
+Errors:
+
+  ======     ======================================================
+  ENOMEM     if the fd could not be created due to lack of memory
+  EMFILE     if the number of opened files exceeds the limit
+  ======     ======================================================
+
+The file descriptor can be used to read VM/vCPU statistics data in binary
+format. The file data is organized into three blocks as below:
++-------------+
+|   Header    |
++-------------+
+| Descriptors |
++-------------+
+| Stats Data  |
++-------------+
+
+The Header block is always at the start of the file. It is only needed to be
+read one time after a VM boot.
+It is in the form of ``struct kvm_stats_header`` as below::
+
+	#define KVM_STATS_ID_MAXLEN		64
+
+	struct kvm_stats_header {
+		char id[KVM_STATS_ID_MAXLEN];
+		__u32 name_size;
+		__u32 count;
+		__u32 desc_offset;
+		__u32 data_offset;
+	};
+
+The ``id`` field is identification for the corresponding KVM statistics. For
+VM statistics, it is in the form of "kvm-{kvm pid}", like "kvm-12345". For
+VCPU statistics, it is in the form of "kvm-{kvm pid}/vcpu-{vcpu id}", like
+"kvm-12345/vcpu-12".
+
+The ``name_size`` field is the size (byte) of the statistics name string
+(including trailing '\0') appended to the end of every statistics descriptor.
+
+The ``count`` field is the number of statistics.
+
+The ``desc_offset`` field is the offset of the Descriptors block from the start
+of the file indicated by the file descriptor.
+
+The ``data_offset`` field is the offset of the Stats Data block from the start
+of the file indicated by the file descriptor.
+
+The Descriptors block is only needed to be read once after a VM boot. It is
+an array of ``struct kvm_stats_desc`` as shown in below code block::
+
+	#define KVM_STATS_TYPE_SHIFT		0
+	#define KVM_STATS_TYPE_MASK		(0xF << KVM_STATS_TYPE_SHIFT)
+	#define KVM_STATS_TYPE_CUMULATIVE	(0x0 << KVM_STATS_TYPE_SHIFT)
+	#define KVM_STATS_TYPE_INSTANT		(0x1 << KVM_STATS_TYPE_SHIFT)
+	#define KVM_STATS_TYPE_MAX		KVM_STATS_TYPE_INSTANT
+
+	#define KVM_STATS_UNIT_SHIFT		4
+	#define KVM_STATS_UNIT_MASK		(0xF << KVM_STATS_UNIT_SHIFT)
+	#define KVM_STATS_UNIT_NONE		(0x0 << KVM_STATS_UNIT_SHIFT)
+	#define KVM_STATS_UNIT_BYTES		(0x1 << KVM_STATS_UNIT_SHIFT)
+	#define KVM_STATS_UNIT_SECONDS		(0x2 << KVM_STATS_UNIT_SHIFT)
+	#define KVM_STATS_UNIT_CYCLES		(0x3 << KVM_STATS_UNIT_SHIFT)
+	#define KVM_STATS_UNIT_MAX		KVM_STATS_UNIT_CYCLES
+
+	#define KVM_STATS_BASE_SHIFT		8
+	#define KVM_STATS_BASE_MASK		(0xF << KVM_STATS_BASE_SHIFT)
+	#define KVM_STATS_BASE_POW10		(0x0 << KVM_STATS_BASE_SHIFT)
+	#define KVM_STATS_BASE_POW2		(0x1 << KVM_STATS_BASE_SHIFT)
+	#define KVM_STATS_BASE_MAX		KVM_STATS_BASE_POW2
+
+	struct kvm_stats_desc {
+		__u32 flags;
+		__s16 exponent;
+		__u16 size;
+		__u32 unused1;
+		__u32 unused2;
+		char name[0];
+	};
+
+The ``flags`` field contains the type and unit of the statistics data described
+by this descriptor. The following flags are supported:
+
+Bits 0-3 of ``flags`` encode the type:
+  * ``KVM_STATS_TYPE_CUMULATIVE``
+    The statistics data is cumulative. The value of data can only be increased.
+    Most of the counters used in KVM are of this type.
+    The corresponding ``count`` filed for this type is always 1.
+  * ``KVM_STATS_TYPE_INSTANT``
+    The statistics data is instantaneous. Its value can be increased or
+    decreased. This type is usually used as a measurement of some resources,
+    like the number of dirty pages, the number of large pages, etc.
+    The corresponding ``count`` field for this type is always 1.
+
+Bits 4-7 of ``flags`` encode the unit:
+  * ``KVM_STATS_UNIT_NONE``
+    There is no unit for the value of statistics data. This usually means that
+    the value is a simple counter of an event.
+  * ``KVM_STATS_UNIT_BYTES``
+    It indicates that the statistics data is used to measure memory size, in the
+    unit of Byte, KiByte, MiByte, GiByte, etc. The unit of the data is
+    determined by the ``exponent`` field in the descriptor. The
+    ``KVM_STATS_BASE_POW2`` flag is valid in this case. The unit of the data is
+    determined by ``pow(2, exponent)``. For example, if value is 10,
+    ``exponent`` is 20, which means the unit of statistics data is MiByte, we
+    can get the statistics data in the unit of Byte by
+    ``value * pow(2, exponent) = 10 * pow(2, 20) = 10 MiByte`` which is
+    10 * 1024 * 1024 Bytes.
+  * ``KVM_STATS_UNIT_SECONDS``
+    It indicates that the statistics data is used to measure time/latency, in
+    the unit of nanosecond, microsecond, millisecond and second. The unit of the
+    data is determined by the ``exponent`` field in the descriptor. The
+    ``KVM_STATS_BASE_POW10`` flag is valid in this case. The unit of the data
+    is determined by ``pow(10, exponent)``. For example, if value is 2000000,
+    ``exponent`` is -6, which means the unit of statistics data is microsecond,
+    we can get the statistics data in the unit of second by
+    ``value * pow(10, exponent) = 2000000 * pow(10, -6) = 2 seconds``.
+  * ``KVM_STATS_UNIT_CYCLES``
+    It indicates that the statistics data is used to measure CPU clock cycles.
+    The ``KVM_STATS_BASE_POW10`` flag is valid in this case. For example, if
+    value is 200, ``exponent`` is 4, we can get the number of CPU clock cycles
+    by ``value * pow(10, exponent) = 200 * pow(10, 4) = 2000000``.
+
+Bits 7-11 of ``flags`` encode the base:
+  * ``KVM_STATS_BASE_POW10``
+    The scale is based on power of 10. It is used for measurement of time and
+    CPU clock cycles.
+  * ``KVM_STATS_BASE_POW2``
+    The scale is based on power of 2. It is used for measurement of memory size.
+
+The ``exponent`` field is the scale of corresponding statistics data. For
+example, if the unit is ``KVM_STATS_UNIT_BYTES``, the base is
+``KVM_STATS_BASE_POW2``, the ``exponent`` is 10, then we know that the real
+unit of the statistics data is KBytes a.k.a pow(2, 10) = 1024 bytes.
+
+The ``size`` field is the number of values of this statistics data. It is in the
+unit of ``unsigned long`` for VM or ``__u64`` for VCPU.
+
+The ``unused1`` and ``unused2`` fields are reserved for future
+support for other types of statistics data, like log/linear histogram.
+
+The ``name`` field points to the name string of the statistics data. The name
+string starts at the end of ``struct kvm_stats_desc``.
+The maximum length (including trailing '\0') is indicated by ``name_size``
+in ``struct kvm_stats_header``.
+
+The Stats Data block contains an array of data values of type ``struct
+kvm_vm_stats_data`` or ``struct kvm_vcpu_stats_data``. It would be read by
+user space periodically to pull statistics data.
+The order of data value in Stats Data block is the same as the order of
+descriptors in Descriptors block.
+  * Statistics data for VM::
+
+	struct kvm_vm_stats_data {
+		unsigned long value[0];
+	};
+
+  * Statistics data for VCPU::
+
+	struct kvm_vcpu_stats_data {
+		__u64 value[0];
+	};
+
 5. The kvm_run structure
 ========================
 
@@ -6891,3 +7062,11 @@ This capability is always enabled.
 This capability indicates that the KVM virtual PTP service is
 supported in the host. A VMM can check whether the service is
 available to the guest on migration.
+
+8.33 KVM_CAP_STATS_BINARY_FD
+----------------------------
+
+:Architectures: all
+
+This capability indicates the feature that user space can create get a file
+descriptor for every VM and VCPU to read statistics data in binary format.
-- 
2.31.1.818.g46aad6cb9e-goog

[PATCH v6 3/4] KVM: stats: Add documentation for statistics data binary interface

[Jing Zhang]

Update KVM API documentation for binary statistics.

Reviewed-by: David Matlack <dmatlack@google.com>
Reviewed-by: Ricardo Koller <ricarkol@google.com>
Signed-off-by: Jing Zhang <jingzhangos@google.com>
---
 Documentation/virt/kvm/api.rst | 179 +++++++++++++++++++++++++++++++++
 1 file changed, 179 insertions(+)

diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
index 7fcb2fd38f42..5cedddd579b2 100644
--- a/Documentation/virt/kvm/api.rst
+++ b/Documentation/virt/kvm/api.rst
@@ -5034,6 +5034,177 @@ see KVM_XEN_VCPU_SET_ATTR above.
 The KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_ADJUST type may not be used
 with the KVM_XEN_VCPU_GET_ATTR ioctl.
 
+4.130 KVM_STATS_GETFD
+---------------------
+
+:Capability: KVM_CAP_STATS_BINARY_FD
+:Architectures: all
+:Type: vm ioctl, vcpu ioctl
+:Parameters: none
+:Returns: statistics file descriptor on success, < 0 on error
+
+Errors:
+
+  ===     ===========================
+  ENOMEM     if the fd could not be created due to lack of memory
+  EMFILE     if the number of opened files exceeds the limit
+  ===     ===========================
+
+The file descriptor can be used to read VM/vCPU statistics data in binary
+format. The file data is organized into three blocks as below:
++-------------+
+|   Header    |
++-------------+
+| Descriptors |
++-------------+
+| Stats Data  |
++-------------+
+
+The Header block is always at the start of the file. It is only needed to be
+read one time after a VM boot.
+It is in the form of ``struct kvm_stats_header`` as below::
+
+	#define KVM_STATS_ID_MAXLEN		64
+
+	struct kvm_stats_header {
+		char id[KVM_STATS_ID_MAXLEN];
+		__u32 name_size;
+		__u32 count;
+		__u32 desc_offset;
+		__u32 data_offset;
+	};
+
+The ``id`` field is identification for the corresponding KVM statistics. For
+VM statistics, it is in the form of "kvm-{kvm pid}", like "kvm-12345". For
+VCPU statistics, it is in the form of "kvm-{kvm pid}/vcpu-{vcpu id}", like
+"kvm-12345/vcpu-12".
+
+The ``name_size`` field is the size (byte) of the statistics name string
+(including trailing '\0') appended to the end of every statistics descriptor.
+
+The ``count`` field is the number of statistics.
+
+The ``desc_offset`` field is the offset of the Descriptors block from the start
+of the file indicated by the file descriptor.
+
+The ``data_offset`` field is the offset of the Stats Data block from the start
+of the file indicated by the file descriptor.
+
+The Descriptors block is only needed to be read once after a VM boot. It is
+an array of ``struct kvm_stats_desc`` as shown in below code block::
+
+	#define KVM_STATS_TYPE_SHIFT		0
+	#define KVM_STATS_TYPE_MASK		(0xF << KVM_STATS_TYPE_SHIFT)
+	#define KVM_STATS_TYPE_CUMULATIVE	(0x0 << KVM_STATS_TYPE_SHIFT)
+	#define KVM_STATS_TYPE_INSTANT		(0x1 << KVM_STATS_TYPE_SHIFT)
+	#define KVM_STATS_TYPE_MAX		KVM_STATS_TYPE_INSTANT
+
+	#define KVM_STATS_UNIT_SHIFT		4
+	#define KVM_STATS_UNIT_MASK		(0xF << KVM_STATS_UNIT_SHIFT)
+	#define KVM_STATS_UNIT_NONE		(0x0 << KVM_STATS_UNIT_SHIFT)
+	#define KVM_STATS_UNIT_BYTES		(0x1 << KVM_STATS_UNIT_SHIFT)
+	#define KVM_STATS_UNIT_SECONDS		(0x2 << KVM_STATS_UNIT_SHIFT)
+	#define KVM_STATS_UNIT_CYCLES		(0x3 << KVM_STATS_UNIT_SHIFT)
+	#define KVM_STATS_UNIT_MAX		KVM_STATS_UNIT_CYCLES
+
+	#define KVM_STATS_BASE_SHIFT		8
+	#define KVM_STATS_BASE_MASK		(0xF << KVM_STATS_BASE_SHIFT)
+	#define KVM_STATS_BASE_POW10		(0x0 << KVM_STATS_BASE_SHIFT)
+	#define KVM_STATS_BASE_POW2		(0x1 << KVM_STATS_BASE_SHIFT)
+	#define KVM_STATS_BASE_MAX		KVM_STATS_BASE_POW2
+
+	struct kvm_stats_desc {
+		__u32 flags;
+		__s16 exponent;
+		__u16 size;
+		__u32 unused1;
+		__u32 unused2;
+		char name[0];
+	};
+
+The ``flags`` field contains the type and unit of the statistics data described
+by this descriptor. The following flags are supported:
+
+Bits 0-3 of ``flags`` encode the type:
+  * ``KVM_STATS_TYPE_CUMULATIVE``
+    The statistics data is cumulative. The value of data can only be increased.
+    Most of the counters used in KVM are of this type.
+    The corresponding ``count`` filed for this type is always 1.
+  * ``KVM_STATS_TYPE_INSTANT``
+    The statistics data is instantaneous. Its value can be increased or
+    decreased. This type is usually used as a measurement of some resources,
+    like the number of dirty pages, the number of large pages, etc.
+    The corresponding ``count`` field for this type is always 1.
+
+Bits 4-7 of ``flags`` encode the unit:
+  * ``KVM_STATS_UNIT_NONE``
+    There is no unit for the value of statistics data. This usually means that
+    the value is a simple counter of an event.
+  * ``KVM_STATS_UNIT_BYTES``
+    It indicates that the statistics data is used to measure memory size, in the
+    unit of Byte, KiByte, MiByte, GiByte, etc. The unit of the data is
+    determined by the ``exponent`` field in the descriptor. The
+    ``KVM_STATS_BASE_POW2`` flag is valid in this case. The unit of the data is
+    determined by ``pow(2, exponent)``. For example, if value is 10,
+    ``exponent`` is 20, which means the unit of statistics data is MiByte, we
+    can get the statistics data in the unit of Byte by
+    ``value * pow(2, exponent) = 10 * pow(2, 20) = 10 MiByte`` which is
+    10 * 1024 * 1024 Bytes.
+  * ``KVM_STATS_UNIT_SECONDS``
+    It indicates that the statistics data is used to measure time/latency, in
+    the unit of nanosecond, microsecond, millisecond and second. The unit of the
+    data is determined by the ``exponent`` field in the descriptor. The
+    ``KVM_STATS_BASE_POW10`` flag is valid in this case. The unit of the data
+    is determined by ``pow(10, exponent)``. For example, if value is 2000000,
+    ``exponent`` is -6, which means the unit of statistics data is microsecond,
+    we can get the statistics data in the unit of second by
+    ``value * pow(10, exponent) = 2000000 * pow(10, -6) = 2 seconds``.
+  * ``KVM_STATS_UNIT_CYCLES``
+    It indicates that the statistics data is used to measure CPU clock cycles.
+    The ``KVM_STATS_BASE_POW10`` flag is valid in this case. For example, if
+    value is 200, ``exponent`` is 4, we can get the number of CPU clock cycles
+    by ``value * pow(10, exponent) = 200 * pow(10, 4) = 2000000``.
+
+Bits 7-11 of ``flags`` encode the base:
+  * ``KVM_STATS_BASE_POW10``
+    The scale is based on power of 10. It is used for measurement of time and
+    CPU clock cycles.
+  * ``KVM_STATS_BASE_POW2``
+    The scale is based on power of 2. It is used for measurement of memory size.
+
+The ``exponent`` field is the scale of corresponding statistics data. For
+example, if the unit is ``KVM_STATS_UNIT_BYTES``, the base is
+``KVM_STATS_BASE_POW2``, the ``exponent`` is 10, then we know that the real
+unit of the statistics data is KBytes a.k.a pow(2, 10) = 1024 bytes.
+
+The ``size`` field is the number of values of this statistics data. It is in the
+unit of ``unsigned long`` for VM or ``__u64`` for VCPU.
+
+The ``unused1`` and ``unused2`` fields are reserved for future
+support for other types of statistics data, like log/linear histogram.
+
+The ``name`` field points to the name string of the statistics data. The name
+string starts at the end of ``struct kvm_stats_desc``.
+The maximum length (including trailing '\0') is indicated by ``name_size``
+in ``struct kvm_stats_header``.
+
+The Stats Data block contains an array of data values of type ``struct
+kvm_vm_stats_data`` or ``struct kvm_vcpu_stats_data``. It would be read by
+user space periodically to pull statistics data.
+The order of data value in Stats Data block is the same as the order of
+descriptors in Descriptors block.
+  * Statistics data for VM::
+
+	struct kvm_vm_stats_data {
+		unsigned long value[0];
+	};
+
+  * Statistics data for VCPU::
+
+	struct kvm_vcpu_stats_data {
+		__u64 value[0];
+	};
+
 5. The kvm_run structure
 ============
 
@@ -6891,3 +7062,11 @@ This capability is always enabled.
 This capability indicates that the KVM virtual PTP service is
 supported in the host. A VMM can check whether the service is
 available to the guest on migration.
+
+8.33 KVM_CAP_STATS_BINARY_FD
+----------------------------
+
+:Architectures: all
+
+This capability indicates the feature that user space can create get a file
+descriptor for every VM and VCPU to read statistics data in binary format.
-- 
2.31.1.818.g46aad6cb9e-goog

[PATCH v6 3/4] KVM: stats: Add documentation for statistics data binary interface

[Jing Zhang]

Update KVM API documentation for binary statistics.

Reviewed-by: David Matlack <dmatlack@google.com>
Reviewed-by: Ricardo Koller <ricarkol@google.com>
Signed-off-by: Jing Zhang <jingzhangos@google.com>
---
 Documentation/virt/kvm/api.rst | 179 +++++++++++++++++++++++++++++++++
 1 file changed, 179 insertions(+)

diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
index 7fcb2fd38f42..5cedddd579b2 100644
--- a/Documentation/virt/kvm/api.rst
+++ b/Documentation/virt/kvm/api.rst
@@ -5034,6 +5034,177 @@ see KVM_XEN_VCPU_SET_ATTR above.
 The KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_ADJUST type may not be used
 with the KVM_XEN_VCPU_GET_ATTR ioctl.
 
+4.130 KVM_STATS_GETFD
+---------------------
+
+:Capability: KVM_CAP_STATS_BINARY_FD
+:Architectures: all
+:Type: vm ioctl, vcpu ioctl
+:Parameters: none
+:Returns: statistics file descriptor on success, < 0 on error
+
+Errors:
+
+  ======     ======================================================
+  ENOMEM     if the fd could not be created due to lack of memory
+  EMFILE     if the number of opened files exceeds the limit
+  ======     ======================================================
+
+The file descriptor can be used to read VM/vCPU statistics data in binary
+format. The file data is organized into three blocks as below:
++-------------+
+|   Header    |
++-------------+
+| Descriptors |
++-------------+
+| Stats Data  |
++-------------+
+
+The Header block is always at the start of the file. It is only needed to be
+read one time after a VM boot.
+It is in the form of ``struct kvm_stats_header`` as below::
+
+	#define KVM_STATS_ID_MAXLEN		64
+
+	struct kvm_stats_header {
+		char id[KVM_STATS_ID_MAXLEN];
+		__u32 name_size;
+		__u32 count;
+		__u32 desc_offset;
+		__u32 data_offset;
+	};
+
+The ``id`` field is identification for the corresponding KVM statistics. For
+VM statistics, it is in the form of "kvm-{kvm pid}", like "kvm-12345". For
+VCPU statistics, it is in the form of "kvm-{kvm pid}/vcpu-{vcpu id}", like
+"kvm-12345/vcpu-12".
+
+The ``name_size`` field is the size (byte) of the statistics name string
+(including trailing '\0') appended to the end of every statistics descriptor.
+
+The ``count`` field is the number of statistics.
+
+The ``desc_offset`` field is the offset of the Descriptors block from the start
+of the file indicated by the file descriptor.
+
+The ``data_offset`` field is the offset of the Stats Data block from the start
+of the file indicated by the file descriptor.
+
+The Descriptors block is only needed to be read once after a VM boot. It is
+an array of ``struct kvm_stats_desc`` as shown in below code block::
+
+	#define KVM_STATS_TYPE_SHIFT		0
+	#define KVM_STATS_TYPE_MASK		(0xF << KVM_STATS_TYPE_SHIFT)
+	#define KVM_STATS_TYPE_CUMULATIVE	(0x0 << KVM_STATS_TYPE_SHIFT)
+	#define KVM_STATS_TYPE_INSTANT		(0x1 << KVM_STATS_TYPE_SHIFT)
+	#define KVM_STATS_TYPE_MAX		KVM_STATS_TYPE_INSTANT
+
+	#define KVM_STATS_UNIT_SHIFT		4
+	#define KVM_STATS_UNIT_MASK		(0xF << KVM_STATS_UNIT_SHIFT)
+	#define KVM_STATS_UNIT_NONE		(0x0 << KVM_STATS_UNIT_SHIFT)
+	#define KVM_STATS_UNIT_BYTES		(0x1 << KVM_STATS_UNIT_SHIFT)
+	#define KVM_STATS_UNIT_SECONDS		(0x2 << KVM_STATS_UNIT_SHIFT)
+	#define KVM_STATS_UNIT_CYCLES		(0x3 << KVM_STATS_UNIT_SHIFT)
+	#define KVM_STATS_UNIT_MAX		KVM_STATS_UNIT_CYCLES
+
+	#define KVM_STATS_BASE_SHIFT		8
+	#define KVM_STATS_BASE_MASK		(0xF << KVM_STATS_BASE_SHIFT)
+	#define KVM_STATS_BASE_POW10		(0x0 << KVM_STATS_BASE_SHIFT)
+	#define KVM_STATS_BASE_POW2		(0x1 << KVM_STATS_BASE_SHIFT)
+	#define KVM_STATS_BASE_MAX		KVM_STATS_BASE_POW2
+
+	struct kvm_stats_desc {
+		__u32 flags;
+		__s16 exponent;
+		__u16 size;
+		__u32 unused1;
+		__u32 unused2;
+		char name[0];
+	};
+
+The ``flags`` field contains the type and unit of the statistics data described
+by this descriptor. The following flags are supported:
+
+Bits 0-3 of ``flags`` encode the type:
+  * ``KVM_STATS_TYPE_CUMULATIVE``
+    The statistics data is cumulative. The value of data can only be increased.
+    Most of the counters used in KVM are of this type.
+    The corresponding ``count`` filed for this type is always 1.
+  * ``KVM_STATS_TYPE_INSTANT``
+    The statistics data is instantaneous. Its value can be increased or
+    decreased. This type is usually used as a measurement of some resources,
+    like the number of dirty pages, the number of large pages, etc.
+    The corresponding ``count`` field for this type is always 1.
+
+Bits 4-7 of ``flags`` encode the unit:
+  * ``KVM_STATS_UNIT_NONE``
+    There is no unit for the value of statistics data. This usually means that
+    the value is a simple counter of an event.
+  * ``KVM_STATS_UNIT_BYTES``
+    It indicates that the statistics data is used to measure memory size, in the
+    unit of Byte, KiByte, MiByte, GiByte, etc. The unit of the data is
+    determined by the ``exponent`` field in the descriptor. The
+    ``KVM_STATS_BASE_POW2`` flag is valid in this case. The unit of the data is
+    determined by ``pow(2, exponent)``. For example, if value is 10,
+    ``exponent`` is 20, which means the unit of statistics data is MiByte, we
+    can get the statistics data in the unit of Byte by
+    ``value * pow(2, exponent) = 10 * pow(2, 20) = 10 MiByte`` which is
+    10 * 1024 * 1024 Bytes.
+  * ``KVM_STATS_UNIT_SECONDS``
+    It indicates that the statistics data is used to measure time/latency, in
+    the unit of nanosecond, microsecond, millisecond and second. The unit of the
+    data is determined by the ``exponent`` field in the descriptor. The
+    ``KVM_STATS_BASE_POW10`` flag is valid in this case. The unit of the data
+    is determined by ``pow(10, exponent)``. For example, if value is 2000000,
+    ``exponent`` is -6, which means the unit of statistics data is microsecond,
+    we can get the statistics data in the unit of second by
+    ``value * pow(10, exponent) = 2000000 * pow(10, -6) = 2 seconds``.
+  * ``KVM_STATS_UNIT_CYCLES``
+    It indicates that the statistics data is used to measure CPU clock cycles.
+    The ``KVM_STATS_BASE_POW10`` flag is valid in this case. For example, if
+    value is 200, ``exponent`` is 4, we can get the number of CPU clock cycles
+    by ``value * pow(10, exponent) = 200 * pow(10, 4) = 2000000``.
+
+Bits 7-11 of ``flags`` encode the base:
+  * ``KVM_STATS_BASE_POW10``
+    The scale is based on power of 10. It is used for measurement of time and
+    CPU clock cycles.
+  * ``KVM_STATS_BASE_POW2``
+    The scale is based on power of 2. It is used for measurement of memory size.
+
+The ``exponent`` field is the scale of corresponding statistics data. For
+example, if the unit is ``KVM_STATS_UNIT_BYTES``, the base is
+``KVM_STATS_BASE_POW2``, the ``exponent`` is 10, then we know that the real
+unit of the statistics data is KBytes a.k.a pow(2, 10) = 1024 bytes.
+
+The ``size`` field is the number of values of this statistics data. It is in the
+unit of ``unsigned long`` for VM or ``__u64`` for VCPU.
+
+The ``unused1`` and ``unused2`` fields are reserved for future
+support for other types of statistics data, like log/linear histogram.
+
+The ``name`` field points to the name string of the statistics data. The name
+string starts at the end of ``struct kvm_stats_desc``.
+The maximum length (including trailing '\0') is indicated by ``name_size``
+in ``struct kvm_stats_header``.
+
+The Stats Data block contains an array of data values of type ``struct
+kvm_vm_stats_data`` or ``struct kvm_vcpu_stats_data``. It would be read by
+user space periodically to pull statistics data.
+The order of data value in Stats Data block is the same as the order of
+descriptors in Descriptors block.
+  * Statistics data for VM::
+
+	struct kvm_vm_stats_data {
+		unsigned long value[0];
+	};
+
+  * Statistics data for VCPU::
+
+	struct kvm_vcpu_stats_data {
+		__u64 value[0];
+	};
+
 5. The kvm_run structure
 ========================
 
@@ -6891,3 +7062,11 @@ This capability is always enabled.
 This capability indicates that the KVM virtual PTP service is
 supported in the host. A VMM can check whether the service is
 available to the guest on migration.
+
+8.33 KVM_CAP_STATS_BINARY_FD
+----------------------------
+
+:Architectures: all
+
+This capability indicates the feature that user space can create get a file
+descriptor for every VM and VCPU to read statistics data in binary format.
-- 
2.31.1.818.g46aad6cb9e-goog

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

Re: [PATCH v6 3/4] KVM: stats: Add documentation for statistics data binary interface

[David Matlack]

On Mon, May 24, 2021 at 8:18 AM Jing Zhang <jingzhangos@google.com> wrote:
>
> Update KVM API documentation for binary statistics.
>
> Reviewed-by: David Matlack <dmatlack@google.com>
> Reviewed-by: Ricardo Koller <ricarkol@google.com>
> Signed-off-by: Jing Zhang <jingzhangos@google.com>

Reviewed-by: David Matlack <dmatlack@google.com>

> ---
>  Documentation/virt/kvm/api.rst | 179 +++++++++++++++++++++++++++++++++
>  1 file changed, 179 insertions(+)
>
> diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
> index 7fcb2fd38f42..5cedddd579b2 100644
> --- a/Documentation/virt/kvm/api.rst
> +++ b/Documentation/virt/kvm/api.rst
> @@ -5034,6 +5034,177 @@ see KVM_XEN_VCPU_SET_ATTR above.
>  The KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_ADJUST type may not be used
>  with the KVM_XEN_VCPU_GET_ATTR ioctl.
>
> +4.130 KVM_STATS_GETFD
> +---------------------
> +
> +:Capability: KVM_CAP_STATS_BINARY_FD
> +:Architectures: all
> +:Type: vm ioctl, vcpu ioctl
> +:Parameters: none
> +:Returns: statistics file descriptor on success, < 0 on error
> +
> +Errors:
> +
> +  ======     ======================================================
> +  ENOMEM     if the fd could not be created due to lack of memory
> +  EMFILE     if the number of opened files exceeds the limit
> +  ======     ======================================================
> +
> +The file descriptor can be used to read VM/vCPU statistics data in binary
> +format. The file data is organized into three blocks as below:
> ++-------------+
> +|   Header    |
> ++-------------+
> +| Descriptors |
> ++-------------+
> +| Stats Data  |
> ++-------------+
> +
> +The Header block is always at the start of the file. It is only needed to be
> +read one time after a VM boot.

nit: "after a VM boot" is not exactly right. If a VM reboots,
userspace does not need to re-read the header. Perhaps change this to
"for the lifetime of the file descriptor"?

> +It is in the form of ``struct kvm_stats_header`` as below::
> +
> +       #define KVM_STATS_ID_MAXLEN             64
> +
> +       struct kvm_stats_header {
> +               char id[KVM_STATS_ID_MAXLEN];
> +               __u32 name_size;
> +               __u32 count;
> +               __u32 desc_offset;
> +               __u32 data_offset;
> +       };
> +
> +The ``id`` field is identification for the corresponding KVM statistics. For
> +VM statistics, it is in the form of "kvm-{kvm pid}", like "kvm-12345". For
> +VCPU statistics, it is in the form of "kvm-{kvm pid}/vcpu-{vcpu id}", like
> +"kvm-12345/vcpu-12".
> +
> +The ``name_size`` field is the size (byte) of the statistics name string
> +(including trailing '\0') appended to the end of every statistics descriptor.
> +
> +The ``count`` field is the number of statistics.
> +
> +The ``desc_offset`` field is the offset of the Descriptors block from the start
> +of the file indicated by the file descriptor.
> +
> +The ``data_offset`` field is the offset of the Stats Data block from the start
> +of the file indicated by the file descriptor.
> +
> +The Descriptors block is only needed to be read once after a VM boot. It is

Ditto here.

> +an array of ``struct kvm_stats_desc`` as shown in below code block::
> +
> +       #define KVM_STATS_TYPE_SHIFT            0
> +       #define KVM_STATS_TYPE_MASK             (0xF << KVM_STATS_TYPE_SHIFT)
> +       #define KVM_STATS_TYPE_CUMULATIVE       (0x0 << KVM_STATS_TYPE_SHIFT)
> +       #define KVM_STATS_TYPE_INSTANT          (0x1 << KVM_STATS_TYPE_SHIFT)
> +       #define KVM_STATS_TYPE_MAX              KVM_STATS_TYPE_INSTANT
> +
> +       #define KVM_STATS_UNIT_SHIFT            4
> +       #define KVM_STATS_UNIT_MASK             (0xF << KVM_STATS_UNIT_SHIFT)
> +       #define KVM_STATS_UNIT_NONE             (0x0 << KVM_STATS_UNIT_SHIFT)
> +       #define KVM_STATS_UNIT_BYTES            (0x1 << KVM_STATS_UNIT_SHIFT)
> +       #define KVM_STATS_UNIT_SECONDS          (0x2 << KVM_STATS_UNIT_SHIFT)
> +       #define KVM_STATS_UNIT_CYCLES           (0x3 << KVM_STATS_UNIT_SHIFT)
> +       #define KVM_STATS_UNIT_MAX              KVM_STATS_UNIT_CYCLES
> +
> +       #define KVM_STATS_BASE_SHIFT            8
> +       #define KVM_STATS_BASE_MASK             (0xF << KVM_STATS_BASE_SHIFT)
> +       #define KVM_STATS_BASE_POW10            (0x0 << KVM_STATS_BASE_SHIFT)
> +       #define KVM_STATS_BASE_POW2             (0x1 << KVM_STATS_BASE_SHIFT)
> +       #define KVM_STATS_BASE_MAX              KVM_STATS_BASE_POW2
> +
> +       struct kvm_stats_desc {
> +               __u32 flags;
> +               __s16 exponent;
> +               __u16 size;
> +               __u32 unused1;
> +               __u32 unused2;
> +               char name[0];
> +       };
> +
> +The ``flags`` field contains the type and unit of the statistics data described
> +by this descriptor. The following flags are supported:
> +
> +Bits 0-3 of ``flags`` encode the type:
> +  * ``KVM_STATS_TYPE_CUMULATIVE``
> +    The statistics data is cumulative. The value of data can only be increased.
> +    Most of the counters used in KVM are of this type.
> +    The corresponding ``count`` filed for this type is always 1.
> +  * ``KVM_STATS_TYPE_INSTANT``
> +    The statistics data is instantaneous. Its value can be increased or
> +    decreased. This type is usually used as a measurement of some resources,
> +    like the number of dirty pages, the number of large pages, etc.
> +    The corresponding ``count`` field for this type is always 1.
> +
> +Bits 4-7 of ``flags`` encode the unit:
> +  * ``KVM_STATS_UNIT_NONE``
> +    There is no unit for the value of statistics data. This usually means that
> +    the value is a simple counter of an event.
> +  * ``KVM_STATS_UNIT_BYTES``
> +    It indicates that the statistics data is used to measure memory size, in the
> +    unit of Byte, KiByte, MiByte, GiByte, etc. The unit of the data is
> +    determined by the ``exponent`` field in the descriptor. The
> +    ``KVM_STATS_BASE_POW2`` flag is valid in this case. The unit of the data is
> +    determined by ``pow(2, exponent)``. For example, if value is 10,
> +    ``exponent`` is 20, which means the unit of statistics data is MiByte, we
> +    can get the statistics data in the unit of Byte by
> +    ``value * pow(2, exponent) = 10 * pow(2, 20) = 10 MiByte`` which is
> +    10 * 1024 * 1024 Bytes.
> +  * ``KVM_STATS_UNIT_SECONDS``
> +    It indicates that the statistics data is used to measure time/latency, in
> +    the unit of nanosecond, microsecond, millisecond and second. The unit of the
> +    data is determined by the ``exponent`` field in the descriptor. The
> +    ``KVM_STATS_BASE_POW10`` flag is valid in this case. The unit of the data
> +    is determined by ``pow(10, exponent)``. For example, if value is 2000000,
> +    ``exponent`` is -6, which means the unit of statistics data is microsecond,
> +    we can get the statistics data in the unit of second by
> +    ``value * pow(10, exponent) = 2000000 * pow(10, -6) = 2 seconds``.
> +  * ``KVM_STATS_UNIT_CYCLES``
> +    It indicates that the statistics data is used to measure CPU clock cycles.
> +    The ``KVM_STATS_BASE_POW10`` flag is valid in this case. For example, if
> +    value is 200, ``exponent`` is 4, we can get the number of CPU clock cycles
> +    by ``value * pow(10, exponent) = 200 * pow(10, 4) = 2000000``.
> +
> +Bits 7-11 of ``flags`` encode the base:
> +  * ``KVM_STATS_BASE_POW10``
> +    The scale is based on power of 10. It is used for measurement of time and
> +    CPU clock cycles.
> +  * ``KVM_STATS_BASE_POW2``
> +    The scale is based on power of 2. It is used for measurement of memory size.
> +
> +The ``exponent`` field is the scale of corresponding statistics data. For
> +example, if the unit is ``KVM_STATS_UNIT_BYTES``, the base is
> +``KVM_STATS_BASE_POW2``, the ``exponent`` is 10, then we know that the real
> +unit of the statistics data is KBytes a.k.a pow(2, 10) = 1024 bytes.
> +
> +The ``size`` field is the number of values of this statistics data. It is in the
> +unit of ``unsigned long`` for VM or ``__u64`` for VCPU.
> +
> +The ``unused1`` and ``unused2`` fields are reserved for future
> +support for other types of statistics data, like log/linear histogram.
> +
> +The ``name`` field points to the name string of the statistics data. The name
> +string starts at the end of ``struct kvm_stats_desc``.
> +The maximum length (including trailing '\0') is indicated by ``name_size``
> +in ``struct kvm_stats_header``.
> +
> +The Stats Data block contains an array of data values of type ``struct
> +kvm_vm_stats_data`` or ``struct kvm_vcpu_stats_data``. It would be read by
> +user space periodically to pull statistics data.
> +The order of data value in Stats Data block is the same as the order of
> +descriptors in Descriptors block.
> +  * Statistics data for VM::
> +
> +       struct kvm_vm_stats_data {
> +               unsigned long value[0];
> +       };
> +
> +  * Statistics data for VCPU::
> +
> +       struct kvm_vcpu_stats_data {
> +               __u64 value[0];
> +       };
> +
>  5. The kvm_run structure
>  ========================
>
> @@ -6891,3 +7062,11 @@ This capability is always enabled.
>  This capability indicates that the KVM virtual PTP service is
>  supported in the host. A VMM can check whether the service is
>  available to the guest on migration.
> +
> +8.33 KVM_CAP_STATS_BINARY_FD
> +----------------------------
> +
> +:Architectures: all
> +
> +This capability indicates the feature that user space can create get a file
> +descriptor for every VM and VCPU to read statistics data in binary format.
> --
> 2.31.1.818.g46aad6cb9e-goog
>

Re: [PATCH v6 3/4] KVM: stats: Add documentation for statistics data binary interface

[David Matlack]

On Mon, May 24, 2021 at 8:18 AM Jing Zhang <jingzhangos@google.com> wrote:
>
> Update KVM API documentation for binary statistics.
>
> Reviewed-by: David Matlack <dmatlack@google.com>
> Reviewed-by: Ricardo Koller <ricarkol@google.com>
> Signed-off-by: Jing Zhang <jingzhangos@google.com>

Reviewed-by: David Matlack <dmatlack@google.com>

> ---
>  Documentation/virt/kvm/api.rst | 179 +++++++++++++++++++++++++++++++++
>  1 file changed, 179 insertions(+)
>
> diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
> index 7fcb2fd38f42..5cedddd579b2 100644
> --- a/Documentation/virt/kvm/api.rst
> +++ b/Documentation/virt/kvm/api.rst
> @@ -5034,6 +5034,177 @@ see KVM_XEN_VCPU_SET_ATTR above.
>  The KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_ADJUST type may not be used
>  with the KVM_XEN_VCPU_GET_ATTR ioctl.
>
> +4.130 KVM_STATS_GETFD
> +---------------------
> +
> +:Capability: KVM_CAP_STATS_BINARY_FD
> +:Architectures: all
> +:Type: vm ioctl, vcpu ioctl
> +:Parameters: none
> +:Returns: statistics file descriptor on success, < 0 on error
> +
> +Errors:
> +
> +  ===     ===========================
> +  ENOMEM     if the fd could not be created due to lack of memory
> +  EMFILE     if the number of opened files exceeds the limit
> +  ===     ===========================
> +
> +The file descriptor can be used to read VM/vCPU statistics data in binary
> +format. The file data is organized into three blocks as below:
> ++-------------+
> +|   Header    |
> ++-------------+
> +| Descriptors |
> ++-------------+
> +| Stats Data  |
> ++-------------+
> +
> +The Header block is always at the start of the file. It is only needed to be
> +read one time after a VM boot.

nit: "after a VM boot" is not exactly right. If a VM reboots,
userspace does not need to re-read the header. Perhaps change this to
"for the lifetime of the file descriptor"?

> +It is in the form of ``struct kvm_stats_header`` as below::
> +
> +       #define KVM_STATS_ID_MAXLEN             64
> +
> +       struct kvm_stats_header {
> +               char id[KVM_STATS_ID_MAXLEN];
> +               __u32 name_size;
> +               __u32 count;
> +               __u32 desc_offset;
> +               __u32 data_offset;
> +       };
> +
> +The ``id`` field is identification for the corresponding KVM statistics. For
> +VM statistics, it is in the form of "kvm-{kvm pid}", like "kvm-12345". For
> +VCPU statistics, it is in the form of "kvm-{kvm pid}/vcpu-{vcpu id}", like
> +"kvm-12345/vcpu-12".
> +
> +The ``name_size`` field is the size (byte) of the statistics name string
> +(including trailing '\0') appended to the end of every statistics descriptor.
> +
> +The ``count`` field is the number of statistics.
> +
> +The ``desc_offset`` field is the offset of the Descriptors block from the start
> +of the file indicated by the file descriptor.
> +
> +The ``data_offset`` field is the offset of the Stats Data block from the start
> +of the file indicated by the file descriptor.
> +
> +The Descriptors block is only needed to be read once after a VM boot. It is

Ditto here.

> +an array of ``struct kvm_stats_desc`` as shown in below code block::
> +
> +       #define KVM_STATS_TYPE_SHIFT            0
> +       #define KVM_STATS_TYPE_MASK             (0xF << KVM_STATS_TYPE_SHIFT)
> +       #define KVM_STATS_TYPE_CUMULATIVE       (0x0 << KVM_STATS_TYPE_SHIFT)
> +       #define KVM_STATS_TYPE_INSTANT          (0x1 << KVM_STATS_TYPE_SHIFT)
> +       #define KVM_STATS_TYPE_MAX              KVM_STATS_TYPE_INSTANT
> +
> +       #define KVM_STATS_UNIT_SHIFT            4
> +       #define KVM_STATS_UNIT_MASK             (0xF << KVM_STATS_UNIT_SHIFT)
> +       #define KVM_STATS_UNIT_NONE             (0x0 << KVM_STATS_UNIT_SHIFT)
> +       #define KVM_STATS_UNIT_BYTES            (0x1 << KVM_STATS_UNIT_SHIFT)
> +       #define KVM_STATS_UNIT_SECONDS          (0x2 << KVM_STATS_UNIT_SHIFT)
> +       #define KVM_STATS_UNIT_CYCLES           (0x3 << KVM_STATS_UNIT_SHIFT)
> +       #define KVM_STATS_UNIT_MAX              KVM_STATS_UNIT_CYCLES
> +
> +       #define KVM_STATS_BASE_SHIFT            8
> +       #define KVM_STATS_BASE_MASK             (0xF << KVM_STATS_BASE_SHIFT)
> +       #define KVM_STATS_BASE_POW10            (0x0 << KVM_STATS_BASE_SHIFT)
> +       #define KVM_STATS_BASE_POW2             (0x1 << KVM_STATS_BASE_SHIFT)
> +       #define KVM_STATS_BASE_MAX              KVM_STATS_BASE_POW2
> +
> +       struct kvm_stats_desc {
> +               __u32 flags;
> +               __s16 exponent;
> +               __u16 size;
> +               __u32 unused1;
> +               __u32 unused2;
> +               char name[0];
> +       };
> +
> +The ``flags`` field contains the type and unit of the statistics data described
> +by this descriptor. The following flags are supported:
> +
> +Bits 0-3 of ``flags`` encode the type:
> +  * ``KVM_STATS_TYPE_CUMULATIVE``
> +    The statistics data is cumulative. The value of data can only be increased.
> +    Most of the counters used in KVM are of this type.
> +    The corresponding ``count`` filed for this type is always 1.
> +  * ``KVM_STATS_TYPE_INSTANT``
> +    The statistics data is instantaneous. Its value can be increased or
> +    decreased. This type is usually used as a measurement of some resources,
> +    like the number of dirty pages, the number of large pages, etc.
> +    The corresponding ``count`` field for this type is always 1.
> +
> +Bits 4-7 of ``flags`` encode the unit:
> +  * ``KVM_STATS_UNIT_NONE``
> +    There is no unit for the value of statistics data. This usually means that
> +    the value is a simple counter of an event.
> +  * ``KVM_STATS_UNIT_BYTES``
> +    It indicates that the statistics data is used to measure memory size, in the
> +    unit of Byte, KiByte, MiByte, GiByte, etc. The unit of the data is
> +    determined by the ``exponent`` field in the descriptor. The
> +    ``KVM_STATS_BASE_POW2`` flag is valid in this case. The unit of the data is
> +    determined by ``pow(2, exponent)``. For example, if value is 10,
> +    ``exponent`` is 20, which means the unit of statistics data is MiByte, we
> +    can get the statistics data in the unit of Byte by
> +    ``value * pow(2, exponent) = 10 * pow(2, 20) = 10 MiByte`` which is
> +    10 * 1024 * 1024 Bytes.
> +  * ``KVM_STATS_UNIT_SECONDS``
> +    It indicates that the statistics data is used to measure time/latency, in
> +    the unit of nanosecond, microsecond, millisecond and second. The unit of the
> +    data is determined by the ``exponent`` field in the descriptor. The
> +    ``KVM_STATS_BASE_POW10`` flag is valid in this case. The unit of the data
> +    is determined by ``pow(10, exponent)``. For example, if value is 2000000,
> +    ``exponent`` is -6, which means the unit of statistics data is microsecond,
> +    we can get the statistics data in the unit of second by
> +    ``value * pow(10, exponent) = 2000000 * pow(10, -6) = 2 seconds``.
> +  * ``KVM_STATS_UNIT_CYCLES``
> +    It indicates that the statistics data is used to measure CPU clock cycles.
> +    The ``KVM_STATS_BASE_POW10`` flag is valid in this case. For example, if
> +    value is 200, ``exponent`` is 4, we can get the number of CPU clock cycles
> +    by ``value * pow(10, exponent) = 200 * pow(10, 4) = 2000000``.
> +
> +Bits 7-11 of ``flags`` encode the base:
> +  * ``KVM_STATS_BASE_POW10``
> +    The scale is based on power of 10. It is used for measurement of time and
> +    CPU clock cycles.
> +  * ``KVM_STATS_BASE_POW2``
> +    The scale is based on power of 2. It is used for measurement of memory size.
> +
> +The ``exponent`` field is the scale of corresponding statistics data. For
> +example, if the unit is ``KVM_STATS_UNIT_BYTES``, the base is
> +``KVM_STATS_BASE_POW2``, the ``exponent`` is 10, then we know that the real
> +unit of the statistics data is KBytes a.k.a pow(2, 10) = 1024 bytes.
> +
> +The ``size`` field is the number of values of this statistics data. It is in the
> +unit of ``unsigned long`` for VM or ``__u64`` for VCPU.
> +
> +The ``unused1`` and ``unused2`` fields are reserved for future
> +support for other types of statistics data, like log/linear histogram.
> +
> +The ``name`` field points to the name string of the statistics data. The name
> +string starts at the end of ``struct kvm_stats_desc``.
> +The maximum length (including trailing '\0') is indicated by ``name_size``
> +in ``struct kvm_stats_header``.
> +
> +The Stats Data block contains an array of data values of type ``struct
> +kvm_vm_stats_data`` or ``struct kvm_vcpu_stats_data``. It would be read by
> +user space periodically to pull statistics data.
> +The order of data value in Stats Data block is the same as the order of
> +descriptors in Descriptors block.
> +  * Statistics data for VM::
> +
> +       struct kvm_vm_stats_data {
> +               unsigned long value[0];
> +       };
> +
> +  * Statistics data for VCPU::
> +
> +       struct kvm_vcpu_stats_data {
> +               __u64 value[0];
> +       };
> +
>  5. The kvm_run structure
>  ============
>
> @@ -6891,3 +7062,11 @@ This capability is always enabled.
>  This capability indicates that the KVM virtual PTP service is
>  supported in the host. A VMM can check whether the service is
>  available to the guest on migration.
> +
> +8.33 KVM_CAP_STATS_BINARY_FD
> +----------------------------
> +
> +:Architectures: all
> +
> +This capability indicates the feature that user space can create get a file
> +descriptor for every VM and VCPU to read statistics data in binary format.
> --
> 2.31.1.818.g46aad6cb9e-goog
>

Re: [PATCH v6 3/4] KVM: stats: Add documentation for statistics data binary interface

[David Matlack]

On Mon, May 24, 2021 at 8:18 AM Jing Zhang <jingzhangos@google.com> wrote:
>
> Update KVM API documentation for binary statistics.
>
> Reviewed-by: David Matlack <dmatlack@google.com>
> Reviewed-by: Ricardo Koller <ricarkol@google.com>
> Signed-off-by: Jing Zhang <jingzhangos@google.com>

Reviewed-by: David Matlack <dmatlack@google.com>

> ---
>  Documentation/virt/kvm/api.rst | 179 +++++++++++++++++++++++++++++++++
>  1 file changed, 179 insertions(+)
>
> diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
> index 7fcb2fd38f42..5cedddd579b2 100644
> --- a/Documentation/virt/kvm/api.rst
> +++ b/Documentation/virt/kvm/api.rst
> @@ -5034,6 +5034,177 @@ see KVM_XEN_VCPU_SET_ATTR above.
>  The KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_ADJUST type may not be used
>  with the KVM_XEN_VCPU_GET_ATTR ioctl.
>
> +4.130 KVM_STATS_GETFD
> +---------------------
> +
> +:Capability: KVM_CAP_STATS_BINARY_FD
> +:Architectures: all
> +:Type: vm ioctl, vcpu ioctl
> +:Parameters: none
> +:Returns: statistics file descriptor on success, < 0 on error
> +
> +Errors:
> +
> +  ======     ======================================================
> +  ENOMEM     if the fd could not be created due to lack of memory
> +  EMFILE     if the number of opened files exceeds the limit
> +  ======     ======================================================
> +
> +The file descriptor can be used to read VM/vCPU statistics data in binary
> +format. The file data is organized into three blocks as below:
> ++-------------+
> +|   Header    |
> ++-------------+
> +| Descriptors |
> ++-------------+
> +| Stats Data  |
> ++-------------+
> +
> +The Header block is always at the start of the file. It is only needed to be
> +read one time after a VM boot.

nit: "after a VM boot" is not exactly right. If a VM reboots,
userspace does not need to re-read the header. Perhaps change this to
"for the lifetime of the file descriptor"?

> +It is in the form of ``struct kvm_stats_header`` as below::
> +
> +       #define KVM_STATS_ID_MAXLEN             64
> +
> +       struct kvm_stats_header {
> +               char id[KVM_STATS_ID_MAXLEN];
> +               __u32 name_size;
> +               __u32 count;
> +               __u32 desc_offset;
> +               __u32 data_offset;
> +       };
> +
> +The ``id`` field is identification for the corresponding KVM statistics. For
> +VM statistics, it is in the form of "kvm-{kvm pid}", like "kvm-12345". For
> +VCPU statistics, it is in the form of "kvm-{kvm pid}/vcpu-{vcpu id}", like
> +"kvm-12345/vcpu-12".
> +
> +The ``name_size`` field is the size (byte) of the statistics name string
> +(including trailing '\0') appended to the end of every statistics descriptor.
> +
> +The ``count`` field is the number of statistics.
> +
> +The ``desc_offset`` field is the offset of the Descriptors block from the start
> +of the file indicated by the file descriptor.
> +
> +The ``data_offset`` field is the offset of the Stats Data block from the start
> +of the file indicated by the file descriptor.
> +
> +The Descriptors block is only needed to be read once after a VM boot. It is

Ditto here.

> +an array of ``struct kvm_stats_desc`` as shown in below code block::
> +
> +       #define KVM_STATS_TYPE_SHIFT            0
> +       #define KVM_STATS_TYPE_MASK             (0xF << KVM_STATS_TYPE_SHIFT)
> +       #define KVM_STATS_TYPE_CUMULATIVE       (0x0 << KVM_STATS_TYPE_SHIFT)
> +       #define KVM_STATS_TYPE_INSTANT          (0x1 << KVM_STATS_TYPE_SHIFT)
> +       #define KVM_STATS_TYPE_MAX              KVM_STATS_TYPE_INSTANT
> +
> +       #define KVM_STATS_UNIT_SHIFT            4
> +       #define KVM_STATS_UNIT_MASK             (0xF << KVM_STATS_UNIT_SHIFT)
> +       #define KVM_STATS_UNIT_NONE             (0x0 << KVM_STATS_UNIT_SHIFT)
> +       #define KVM_STATS_UNIT_BYTES            (0x1 << KVM_STATS_UNIT_SHIFT)
> +       #define KVM_STATS_UNIT_SECONDS          (0x2 << KVM_STATS_UNIT_SHIFT)
> +       #define KVM_STATS_UNIT_CYCLES           (0x3 << KVM_STATS_UNIT_SHIFT)
> +       #define KVM_STATS_UNIT_MAX              KVM_STATS_UNIT_CYCLES
> +
> +       #define KVM_STATS_BASE_SHIFT            8
> +       #define KVM_STATS_BASE_MASK             (0xF << KVM_STATS_BASE_SHIFT)
> +       #define KVM_STATS_BASE_POW10            (0x0 << KVM_STATS_BASE_SHIFT)
> +       #define KVM_STATS_BASE_POW2             (0x1 << KVM_STATS_BASE_SHIFT)
> +       #define KVM_STATS_BASE_MAX              KVM_STATS_BASE_POW2
> +
> +       struct kvm_stats_desc {
> +               __u32 flags;
> +               __s16 exponent;
> +               __u16 size;
> +               __u32 unused1;
> +               __u32 unused2;
> +               char name[0];
> +       };
> +
> +The ``flags`` field contains the type and unit of the statistics data described
> +by this descriptor. The following flags are supported:
> +
> +Bits 0-3 of ``flags`` encode the type:
> +  * ``KVM_STATS_TYPE_CUMULATIVE``
> +    The statistics data is cumulative. The value of data can only be increased.
> +    Most of the counters used in KVM are of this type.
> +    The corresponding ``count`` filed for this type is always 1.
> +  * ``KVM_STATS_TYPE_INSTANT``
> +    The statistics data is instantaneous. Its value can be increased or
> +    decreased. This type is usually used as a measurement of some resources,
> +    like the number of dirty pages, the number of large pages, etc.
> +    The corresponding ``count`` field for this type is always 1.
> +
> +Bits 4-7 of ``flags`` encode the unit:
> +  * ``KVM_STATS_UNIT_NONE``
> +    There is no unit for the value of statistics data. This usually means that
> +    the value is a simple counter of an event.
> +  * ``KVM_STATS_UNIT_BYTES``
> +    It indicates that the statistics data is used to measure memory size, in the
> +    unit of Byte, KiByte, MiByte, GiByte, etc. The unit of the data is
> +    determined by the ``exponent`` field in the descriptor. The
> +    ``KVM_STATS_BASE_POW2`` flag is valid in this case. The unit of the data is
> +    determined by ``pow(2, exponent)``. For example, if value is 10,
> +    ``exponent`` is 20, which means the unit of statistics data is MiByte, we
> +    can get the statistics data in the unit of Byte by
> +    ``value * pow(2, exponent) = 10 * pow(2, 20) = 10 MiByte`` which is
> +    10 * 1024 * 1024 Bytes.
> +  * ``KVM_STATS_UNIT_SECONDS``
> +    It indicates that the statistics data is used to measure time/latency, in
> +    the unit of nanosecond, microsecond, millisecond and second. The unit of the
> +    data is determined by the ``exponent`` field in the descriptor. The
> +    ``KVM_STATS_BASE_POW10`` flag is valid in this case. The unit of the data
> +    is determined by ``pow(10, exponent)``. For example, if value is 2000000,
> +    ``exponent`` is -6, which means the unit of statistics data is microsecond,
> +    we can get the statistics data in the unit of second by
> +    ``value * pow(10, exponent) = 2000000 * pow(10, -6) = 2 seconds``.
> +  * ``KVM_STATS_UNIT_CYCLES``
> +    It indicates that the statistics data is used to measure CPU clock cycles.
> +    The ``KVM_STATS_BASE_POW10`` flag is valid in this case. For example, if
> +    value is 200, ``exponent`` is 4, we can get the number of CPU clock cycles
> +    by ``value * pow(10, exponent) = 200 * pow(10, 4) = 2000000``.
> +
> +Bits 7-11 of ``flags`` encode the base:
> +  * ``KVM_STATS_BASE_POW10``
> +    The scale is based on power of 10. It is used for measurement of time and
> +    CPU clock cycles.
> +  * ``KVM_STATS_BASE_POW2``
> +    The scale is based on power of 2. It is used for measurement of memory size.
> +
> +The ``exponent`` field is the scale of corresponding statistics data. For
> +example, if the unit is ``KVM_STATS_UNIT_BYTES``, the base is
> +``KVM_STATS_BASE_POW2``, the ``exponent`` is 10, then we know that the real
> +unit of the statistics data is KBytes a.k.a pow(2, 10) = 1024 bytes.
> +
> +The ``size`` field is the number of values of this statistics data. It is in the
> +unit of ``unsigned long`` for VM or ``__u64`` for VCPU.
> +
> +The ``unused1`` and ``unused2`` fields are reserved for future
> +support for other types of statistics data, like log/linear histogram.
> +
> +The ``name`` field points to the name string of the statistics data. The name
> +string starts at the end of ``struct kvm_stats_desc``.
> +The maximum length (including trailing '\0') is indicated by ``name_size``
> +in ``struct kvm_stats_header``.
> +
> +The Stats Data block contains an array of data values of type ``struct
> +kvm_vm_stats_data`` or ``struct kvm_vcpu_stats_data``. It would be read by
> +user space periodically to pull statistics data.
> +The order of data value in Stats Data block is the same as the order of
> +descriptors in Descriptors block.
> +  * Statistics data for VM::
> +
> +       struct kvm_vm_stats_data {
> +               unsigned long value[0];
> +       };
> +
> +  * Statistics data for VCPU::
> +
> +       struct kvm_vcpu_stats_data {
> +               __u64 value[0];
> +       };
> +
>  5. The kvm_run structure
>  ========================
>
> @@ -6891,3 +7062,11 @@ This capability is always enabled.
>  This capability indicates that the KVM virtual PTP service is
>  supported in the host. A VMM can check whether the service is
>  available to the guest on migration.
> +
> +8.33 KVM_CAP_STATS_BINARY_FD
> +----------------------------
> +
> +:Architectures: all
> +
> +This capability indicates the feature that user space can create get a file
> +descriptor for every VM and VCPU to read statistics data in binary format.
> --
> 2.31.1.818.g46aad6cb9e-goog
>
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kvmarm@lists.cs.columbia.edu
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[PATCH v6 4/4] KVM: selftests: Add selftest for KVM statistics data binary interface

[Jing Zhang]

Add selftest to check KVM stats descriptors validity.

Reviewed-by: David Matlack <dmatlack@google.com>
Reviewed-by: Ricardo Koller <ricarkol@google.com>
Signed-off-by: Jing Zhang <jingzhangos@google.com>
---
 tools/testing/selftests/kvm/.gitignore        |   1 +
 tools/testing/selftests/kvm/Makefile          |   3 +
 .../testing/selftests/kvm/include/kvm_util.h  |   3 +
 .../selftests/kvm/kvm_bin_form_stats.c        | 216 ++++++++++++++++++
 tools/testing/selftests/kvm/lib/kvm_util.c    |  12 +
 5 files changed, 235 insertions(+)
 create mode 100644 tools/testing/selftests/kvm/kvm_bin_form_stats.c

diff --git a/tools/testing/selftests/kvm/.gitignore b/tools/testing/selftests/kvm/.gitignore
index bd83158e0e0b..35796667c944 100644
--- a/tools/testing/selftests/kvm/.gitignore
+++ b/tools/testing/selftests/kvm/.gitignore
@@ -43,3 +43,4 @@
 /memslot_modification_stress_test
 /set_memory_region_test
 /steal_time
+/kvm_bin_form_stats
diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
index e439d027939d..2984c86c848a 100644
--- a/tools/testing/selftests/kvm/Makefile
+++ b/tools/testing/selftests/kvm/Makefile
@@ -76,6 +76,7 @@ TEST_GEN_PROGS_x86_64 += kvm_page_table_test
 TEST_GEN_PROGS_x86_64 += memslot_modification_stress_test
 TEST_GEN_PROGS_x86_64 += set_memory_region_test
 TEST_GEN_PROGS_x86_64 += steal_time
+TEST_GEN_PROGS_x86_64 += kvm_bin_form_stats
 
 TEST_GEN_PROGS_aarch64 += aarch64/get-reg-list
 TEST_GEN_PROGS_aarch64 += aarch64/get-reg-list-sve
@@ -87,6 +88,7 @@ TEST_GEN_PROGS_aarch64 += kvm_create_max_vcpus
 TEST_GEN_PROGS_aarch64 += kvm_page_table_test
 TEST_GEN_PROGS_aarch64 += set_memory_region_test
 TEST_GEN_PROGS_aarch64 += steal_time
+TEST_GEN_PROGS_aarch64 += kvm_bin_form_stats
 
 TEST_GEN_PROGS_s390x = s390x/memop
 TEST_GEN_PROGS_s390x += s390x/resets
@@ -96,6 +98,7 @@ TEST_GEN_PROGS_s390x += dirty_log_test
 TEST_GEN_PROGS_s390x += kvm_create_max_vcpus
 TEST_GEN_PROGS_s390x += kvm_page_table_test
 TEST_GEN_PROGS_s390x += set_memory_region_test
+TEST_GEN_PROGS_s390x += kvm_bin_form_stats
 
 TEST_GEN_PROGS += $(TEST_GEN_PROGS_$(UNAME_M))
 LIBKVM += $(LIBKVM_$(UNAME_M))
diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h
index a8f022794ce3..ee01a67022d9 100644
--- a/tools/testing/selftests/kvm/include/kvm_util.h
+++ b/tools/testing/selftests/kvm/include/kvm_util.h
@@ -387,4 +387,7 @@ uint64_t get_ucall(struct kvm_vm *vm, uint32_t vcpu_id, struct ucall *uc);
 #define GUEST_ASSERT_4(_condition, arg1, arg2, arg3, arg4) \
 	__GUEST_ASSERT((_condition), 4, (arg1), (arg2), (arg3), (arg4))
 
+int vm_get_statsfd(struct kvm_vm *vm);
+int vcpu_get_statsfd(struct kvm_vm *vm, uint32_t vcpuid);
+
 #endif /* SELFTEST_KVM_UTIL_H */
diff --git a/tools/testing/selftests/kvm/kvm_bin_form_stats.c b/tools/testing/selftests/kvm/kvm_bin_form_stats.c
new file mode 100644
index 000000000000..09e12c5838af
--- /dev/null
+++ b/tools/testing/selftests/kvm/kvm_bin_form_stats.c
@@ -0,0 +1,216 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * kvm_bin_form_stats
+ *
+ * Copyright (C) 2021, Google LLC.
+ *
+ * Test the fd-based interface for KVM statistics.
+ */
+
+#define _GNU_SOURCE /* for program_invocation_short_name */
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+#include "test_util.h"
+
+#include "kvm_util.h"
+#include "asm/kvm.h"
+#include "linux/kvm.h"
+
+int stats_test(int stats_fd, int size_stat)
+{
+	ssize_t ret;
+	int i;
+	size_t size_desc, size_data = 0;
+	struct kvm_stats_header header;
+	struct kvm_stats_desc *stats_desc, *pdesc;
+	void *stats_data;
+
+	/* Read kvm stats header */
+	ret = read(stats_fd, &header, sizeof(header));
+	TEST_ASSERT(ret == sizeof(header), "Read stats header");
+	size_desc = sizeof(*stats_desc) + header.name_size;
+
+	/* Check id string in header, that should start with "kvm" */
+	TEST_ASSERT(!strncmp(header.id, "kvm", 3) &&
+			strlen(header.id) < KVM_STATS_ID_MAXLEN,
+			"Invalid KVM stats type");
+
+	/* Sanity check for other fields in header */
+	if (header.count == 0)
+		return 0;
+	/* Check overlap */
+	TEST_ASSERT(header.desc_offset > 0 && header.data_offset > 0
+			&& header.desc_offset >= sizeof(header)
+			&& header.data_offset >= sizeof(header),
+			"Invalid offset fields in header");
+	TEST_ASSERT(header.desc_offset > header.data_offset
+			|| (header.desc_offset + size_desc * header.count <=
+				header.data_offset),
+			"Descriptor block is overlapped with data block");
+
+	/* Allocate memory for stats descriptors */
+	stats_desc = calloc(header.count, size_desc);
+	TEST_ASSERT(stats_desc, "Allocate memory for stats descriptors");
+	/* Read kvm stats descriptors */
+	ret = pread(stats_fd, stats_desc,
+			size_desc * header.count, header.desc_offset);
+	TEST_ASSERT(ret == size_desc * header.count,
+			"Read KVM stats descriptors");
+
+	/* Sanity check for fields in descriptors */
+	for (i = 0; i < header.count; ++i) {
+		pdesc = (void *)stats_desc + i * size_desc;
+		/* Check type,unit,base boundaries */
+		TEST_ASSERT((pdesc->flags & KVM_STATS_TYPE_MASK)
+				<= KVM_STATS_TYPE_MAX, "Unknown KVM stats type");
+		TEST_ASSERT((pdesc->flags & KVM_STATS_UNIT_MASK)
+				<= KVM_STATS_UNIT_MAX, "Unknown KVM stats unit");
+		TEST_ASSERT((pdesc->flags & KVM_STATS_BASE_MASK)
+				<= KVM_STATS_BASE_MAX, "Unknown KVM stats base");
+		/* Check exponent for stats unit
+		 * Exponent for counter should be greater than or equal to 0
+		 * Exponent for unit bytes should be greater than or equal to 0
+		 * Exponent for unit seconds should be less than or equal to 0
+		 * Exponent for unit clock cycles should be greater than or
+		 * equal to 0
+		 */
+		switch (pdesc->flags & KVM_STATS_UNIT_MASK) {
+		case KVM_STATS_UNIT_NONE:
+		case KVM_STATS_UNIT_BYTES:
+		case KVM_STATS_UNIT_CYCLES:
+			TEST_ASSERT(pdesc->exponent >= 0,
+					"Unsupported KVM stats unit");
+			break;
+		case KVM_STATS_UNIT_SECONDS:
+			TEST_ASSERT(pdesc->exponent <= 0,
+					"Unsupported KVM stats unit");
+			break;
+		}
+		/* Check name string */
+		TEST_ASSERT(strlen(pdesc->name) < header.name_size,
+				"KVM stats name(%s) too long", pdesc->name);
+		/* Check size field, which should not be zero */
+		TEST_ASSERT(pdesc->size, "KVM descriptor(%s) with size of 0",
+				pdesc->name);
+		size_data += pdesc->size * size_stat;
+	}
+	/* Check overlap */
+	TEST_ASSERT(header.data_offset >= header.desc_offset
+			|| header.data_offset + size_data <= header.desc_offset,
+			"Data block is overlapped with Descriptor block");
+	/* Check validity of all stats data size */
+	TEST_ASSERT(size_data >= header.count * size_stat,
+			"Data size is not correct");
+
+	/* Allocate memory for stats data */
+	stats_data = malloc(size_data);
+	TEST_ASSERT(stats_data, "Allocate memory for stats data");
+	/* Read kvm stats data as a bulk */
+	ret = pread(stats_fd, stats_data, size_data, header.data_offset);
+	TEST_ASSERT(ret == size_data, "Read KVM stats data");
+	/* Read kvm stats data one by one */
+	size_data = 0;
+	for (i = 0; i < header.count; ++i) {
+		pdesc = (void *)stats_desc + i * size_desc;
+		ret = pread(stats_fd, stats_data, pdesc->size * size_stat,
+				header.data_offset + size_data);
+		TEST_ASSERT(ret == pdesc->size * size_stat,
+				"Read data of KVM stats: %s", pdesc->name);
+		size_data += pdesc->size * size_stat;
+	}
+
+	free(stats_data);
+	free(stats_desc);
+	return 0;
+}
+
+
+int vm_stats_test(struct kvm_vm *vm)
+{
+	int stats_fd;
+	struct kvm_vm_stats_data *stats_data;
+
+	/* Get fd for VM stats */
+	stats_fd = vm_get_statsfd(vm);
+	TEST_ASSERT(stats_fd >= 0, "Get VM stats fd");
+
+	stats_test(stats_fd, sizeof(stats_data->value[0]));
+	close(stats_fd);
+
+	return 0;
+}
+
+int vcpu_stats_test(struct kvm_vm *vm, int vcpu_id)
+{
+	int stats_fd;
+	struct kvm_vcpu_stats_data *stats_data;
+
+	/* Get fd for VCPU stats */
+	stats_fd = vcpu_get_statsfd(vm, vcpu_id);
+	TEST_ASSERT(stats_fd >= 0, "Get VCPU stats fd");
+
+	stats_test(stats_fd, sizeof(stats_data->value[0]));
+	close(stats_fd);
+
+	return 0;
+}
+
+#define DEFAULT_NUM_VM		4
+#define DEFAULT_NUM_VCPU	4
+
+/*
+ * Usage: kvm_bin_form_stats [#vm] [#vcpu]
+ * The first parameter #vm set the number of VMs being created.
+ * The second parameter #vcpu set the number of VCPUs being created.
+ * By default, DEFAULT_NUM_VM VM and DEFAULT_NUM_VCPU VCPU for the VM would be
+ * created for testing.
+ */
+
+int main(int argc, char *argv[])
+{
+	int max_vm = DEFAULT_NUM_VM, max_vcpu = DEFAULT_NUM_VCPU, ret, i, j;
+	struct kvm_vm **vms;
+
+	/* Get the number of VMs and VCPUs that would be created for testing. */
+	if (argc > 1) {
+		max_vm = strtol(argv[1], NULL, 0);
+		if (max_vm <= 0)
+			max_vm = DEFAULT_NUM_VM;
+	}
+	if (argc > 2) {
+		max_vcpu = strtol(argv[2], NULL, 0);
+		if (max_vcpu <= 0)
+			max_vcpu = DEFAULT_NUM_VCPU;
+	}
+
+	/* Check the extension for binary stats */
+	ret = kvm_check_cap(KVM_CAP_STATS_BINARY_FD);
+	TEST_ASSERT(ret >= 0,
+			"Binary form statistics interface is not supported");
+
+	/* Create VMs and VCPUs */
+	vms = malloc(sizeof(vms[0]) * max_vm);
+	TEST_ASSERT(vms, "Allocate memory for storing VM pointers");
+	for (i = 0; i < max_vm; ++i) {
+		vms[i] = vm_create(VM_MODE_DEFAULT,
+				DEFAULT_GUEST_PHY_PAGES, O_RDWR);
+		for (j = 0; j < max_vcpu; ++j)
+			vm_vcpu_add(vms[i], j);
+	}
+
+	/* Check stats read for every VM and VCPU */
+	for (i = 0; i < max_vm; ++i) {
+		vm_stats_test(vms[i]);
+		for (j = 0; j < max_vcpu; ++j)
+			vcpu_stats_test(vms[i], j);
+	}
+
+	for (i = 0; i < max_vm; ++i)
+		kvm_vm_free(vms[i]);
+	free(vms);
+	return 0;
+}
diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
index fc83f6c5902d..d9e0b2c8b906 100644
--- a/tools/testing/selftests/kvm/lib/kvm_util.c
+++ b/tools/testing/selftests/kvm/lib/kvm_util.c
@@ -2090,3 +2090,15 @@ unsigned int vm_calc_num_guest_pages(enum vm_guest_mode mode, size_t size)
 	n = DIV_ROUND_UP(size, vm_guest_mode_params[mode].page_size);
 	return vm_adjust_num_guest_pages(mode, n);
 }
+
+int vm_get_statsfd(struct kvm_vm *vm)
+{
+	return ioctl(vm->fd, KVM_STATS_GETFD, NULL);
+}
+
+int vcpu_get_statsfd(struct kvm_vm *vm, uint32_t vcpuid)
+{
+	struct vcpu *vcpu = vcpu_find(vm, vcpuid);
+
+	return ioctl(vcpu->fd, KVM_STATS_GETFD, NULL);
+}
-- 
2.31.1.818.g46aad6cb9e-goog

[PATCH v6 4/4] KVM: selftests: Add selftest for KVM statistics data binary interface

[Jing Zhang]

Add selftest to check KVM stats descriptors validity.

Reviewed-by: David Matlack <dmatlack@google.com>
Reviewed-by: Ricardo Koller <ricarkol@google.com>
Signed-off-by: Jing Zhang <jingzhangos@google.com>
---
 tools/testing/selftests/kvm/.gitignore        |   1 +
 tools/testing/selftests/kvm/Makefile          |   3 +
 .../testing/selftests/kvm/include/kvm_util.h  |   3 +
 .../selftests/kvm/kvm_bin_form_stats.c        | 216 ++++++++++++++++++
 tools/testing/selftests/kvm/lib/kvm_util.c    |  12 +
 5 files changed, 235 insertions(+)
 create mode 100644 tools/testing/selftests/kvm/kvm_bin_form_stats.c

diff --git a/tools/testing/selftests/kvm/.gitignore b/tools/testing/selftests/kvm/.gitignore
index bd83158e0e0b..35796667c944 100644
--- a/tools/testing/selftests/kvm/.gitignore
+++ b/tools/testing/selftests/kvm/.gitignore
@@ -43,3 +43,4 @@
 /memslot_modification_stress_test
 /set_memory_region_test
 /steal_time
+/kvm_bin_form_stats
diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
index e439d027939d..2984c86c848a 100644
--- a/tools/testing/selftests/kvm/Makefile
+++ b/tools/testing/selftests/kvm/Makefile
@@ -76,6 +76,7 @@ TEST_GEN_PROGS_x86_64 += kvm_page_table_test
 TEST_GEN_PROGS_x86_64 += memslot_modification_stress_test
 TEST_GEN_PROGS_x86_64 += set_memory_region_test
 TEST_GEN_PROGS_x86_64 += steal_time
+TEST_GEN_PROGS_x86_64 += kvm_bin_form_stats
 
 TEST_GEN_PROGS_aarch64 += aarch64/get-reg-list
 TEST_GEN_PROGS_aarch64 += aarch64/get-reg-list-sve
@@ -87,6 +88,7 @@ TEST_GEN_PROGS_aarch64 += kvm_create_max_vcpus
 TEST_GEN_PROGS_aarch64 += kvm_page_table_test
 TEST_GEN_PROGS_aarch64 += set_memory_region_test
 TEST_GEN_PROGS_aarch64 += steal_time
+TEST_GEN_PROGS_aarch64 += kvm_bin_form_stats
 
 TEST_GEN_PROGS_s390x = s390x/memop
 TEST_GEN_PROGS_s390x += s390x/resets
@@ -96,6 +98,7 @@ TEST_GEN_PROGS_s390x += dirty_log_test
 TEST_GEN_PROGS_s390x += kvm_create_max_vcpus
 TEST_GEN_PROGS_s390x += kvm_page_table_test
 TEST_GEN_PROGS_s390x += set_memory_region_test
+TEST_GEN_PROGS_s390x += kvm_bin_form_stats
 
 TEST_GEN_PROGS += $(TEST_GEN_PROGS_$(UNAME_M))
 LIBKVM += $(LIBKVM_$(UNAME_M))
diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h
index a8f022794ce3..ee01a67022d9 100644
--- a/tools/testing/selftests/kvm/include/kvm_util.h
+++ b/tools/testing/selftests/kvm/include/kvm_util.h
@@ -387,4 +387,7 @@ uint64_t get_ucall(struct kvm_vm *vm, uint32_t vcpu_id, struct ucall *uc);
 #define GUEST_ASSERT_4(_condition, arg1, arg2, arg3, arg4) \
 	__GUEST_ASSERT((_condition), 4, (arg1), (arg2), (arg3), (arg4))
 
+int vm_get_statsfd(struct kvm_vm *vm);
+int vcpu_get_statsfd(struct kvm_vm *vm, uint32_t vcpuid);
+
 #endif /* SELFTEST_KVM_UTIL_H */
diff --git a/tools/testing/selftests/kvm/kvm_bin_form_stats.c b/tools/testing/selftests/kvm/kvm_bin_form_stats.c
new file mode 100644
index 000000000000..09e12c5838af
--- /dev/null
+++ b/tools/testing/selftests/kvm/kvm_bin_form_stats.c
@@ -0,0 +1,216 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * kvm_bin_form_stats
+ *
+ * Copyright (C) 2021, Google LLC.
+ *
+ * Test the fd-based interface for KVM statistics.
+ */
+
+#define _GNU_SOURCE /* for program_invocation_short_name */
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+#include "test_util.h"
+
+#include "kvm_util.h"
+#include "asm/kvm.h"
+#include "linux/kvm.h"
+
+int stats_test(int stats_fd, int size_stat)
+{
+	ssize_t ret;
+	int i;
+	size_t size_desc, size_data = 0;
+	struct kvm_stats_header header;
+	struct kvm_stats_desc *stats_desc, *pdesc;
+	void *stats_data;
+
+	/* Read kvm stats header */
+	ret = read(stats_fd, &header, sizeof(header));
+	TEST_ASSERT(ret = sizeof(header), "Read stats header");
+	size_desc = sizeof(*stats_desc) + header.name_size;
+
+	/* Check id string in header, that should start with "kvm" */
+	TEST_ASSERT(!strncmp(header.id, "kvm", 3) &&
+			strlen(header.id) < KVM_STATS_ID_MAXLEN,
+			"Invalid KVM stats type");
+
+	/* Sanity check for other fields in header */
+	if (header.count = 0)
+		return 0;
+	/* Check overlap */
+	TEST_ASSERT(header.desc_offset > 0 && header.data_offset > 0
+			&& header.desc_offset >= sizeof(header)
+			&& header.data_offset >= sizeof(header),
+			"Invalid offset fields in header");
+	TEST_ASSERT(header.desc_offset > header.data_offset
+			|| (header.desc_offset + size_desc * header.count <+				header.data_offset),
+			"Descriptor block is overlapped with data block");
+
+	/* Allocate memory for stats descriptors */
+	stats_desc = calloc(header.count, size_desc);
+	TEST_ASSERT(stats_desc, "Allocate memory for stats descriptors");
+	/* Read kvm stats descriptors */
+	ret = pread(stats_fd, stats_desc,
+			size_desc * header.count, header.desc_offset);
+	TEST_ASSERT(ret = size_desc * header.count,
+			"Read KVM stats descriptors");
+
+	/* Sanity check for fields in descriptors */
+	for (i = 0; i < header.count; ++i) {
+		pdesc = (void *)stats_desc + i * size_desc;
+		/* Check type,unit,base boundaries */
+		TEST_ASSERT((pdesc->flags & KVM_STATS_TYPE_MASK)
+				<= KVM_STATS_TYPE_MAX, "Unknown KVM stats type");
+		TEST_ASSERT((pdesc->flags & KVM_STATS_UNIT_MASK)
+				<= KVM_STATS_UNIT_MAX, "Unknown KVM stats unit");
+		TEST_ASSERT((pdesc->flags & KVM_STATS_BASE_MASK)
+				<= KVM_STATS_BASE_MAX, "Unknown KVM stats base");
+		/* Check exponent for stats unit
+		 * Exponent for counter should be greater than or equal to 0
+		 * Exponent for unit bytes should be greater than or equal to 0
+		 * Exponent for unit seconds should be less than or equal to 0
+		 * Exponent for unit clock cycles should be greater than or
+		 * equal to 0
+		 */
+		switch (pdesc->flags & KVM_STATS_UNIT_MASK) {
+		case KVM_STATS_UNIT_NONE:
+		case KVM_STATS_UNIT_BYTES:
+		case KVM_STATS_UNIT_CYCLES:
+			TEST_ASSERT(pdesc->exponent >= 0,
+					"Unsupported KVM stats unit");
+			break;
+		case KVM_STATS_UNIT_SECONDS:
+			TEST_ASSERT(pdesc->exponent <= 0,
+					"Unsupported KVM stats unit");
+			break;
+		}
+		/* Check name string */
+		TEST_ASSERT(strlen(pdesc->name) < header.name_size,
+				"KVM stats name(%s) too long", pdesc->name);
+		/* Check size field, which should not be zero */
+		TEST_ASSERT(pdesc->size, "KVM descriptor(%s) with size of 0",
+				pdesc->name);
+		size_data += pdesc->size * size_stat;
+	}
+	/* Check overlap */
+	TEST_ASSERT(header.data_offset >= header.desc_offset
+			|| header.data_offset + size_data <= header.desc_offset,
+			"Data block is overlapped with Descriptor block");
+	/* Check validity of all stats data size */
+	TEST_ASSERT(size_data >= header.count * size_stat,
+			"Data size is not correct");
+
+	/* Allocate memory for stats data */
+	stats_data = malloc(size_data);
+	TEST_ASSERT(stats_data, "Allocate memory for stats data");
+	/* Read kvm stats data as a bulk */
+	ret = pread(stats_fd, stats_data, size_data, header.data_offset);
+	TEST_ASSERT(ret = size_data, "Read KVM stats data");
+	/* Read kvm stats data one by one */
+	size_data = 0;
+	for (i = 0; i < header.count; ++i) {
+		pdesc = (void *)stats_desc + i * size_desc;
+		ret = pread(stats_fd, stats_data, pdesc->size * size_stat,
+				header.data_offset + size_data);
+		TEST_ASSERT(ret = pdesc->size * size_stat,
+				"Read data of KVM stats: %s", pdesc->name);
+		size_data += pdesc->size * size_stat;
+	}
+
+	free(stats_data);
+	free(stats_desc);
+	return 0;
+}
+
+
+int vm_stats_test(struct kvm_vm *vm)
+{
+	int stats_fd;
+	struct kvm_vm_stats_data *stats_data;
+
+	/* Get fd for VM stats */
+	stats_fd = vm_get_statsfd(vm);
+	TEST_ASSERT(stats_fd >= 0, "Get VM stats fd");
+
+	stats_test(stats_fd, sizeof(stats_data->value[0]));
+	close(stats_fd);
+
+	return 0;
+}
+
+int vcpu_stats_test(struct kvm_vm *vm, int vcpu_id)
+{
+	int stats_fd;
+	struct kvm_vcpu_stats_data *stats_data;
+
+	/* Get fd for VCPU stats */
+	stats_fd = vcpu_get_statsfd(vm, vcpu_id);
+	TEST_ASSERT(stats_fd >= 0, "Get VCPU stats fd");
+
+	stats_test(stats_fd, sizeof(stats_data->value[0]));
+	close(stats_fd);
+
+	return 0;
+}
+
+#define DEFAULT_NUM_VM		4
+#define DEFAULT_NUM_VCPU	4
+
+/*
+ * Usage: kvm_bin_form_stats [#vm] [#vcpu]
+ * The first parameter #vm set the number of VMs being created.
+ * The second parameter #vcpu set the number of VCPUs being created.
+ * By default, DEFAULT_NUM_VM VM and DEFAULT_NUM_VCPU VCPU for the VM would be
+ * created for testing.
+ */
+
+int main(int argc, char *argv[])
+{
+	int max_vm = DEFAULT_NUM_VM, max_vcpu = DEFAULT_NUM_VCPU, ret, i, j;
+	struct kvm_vm **vms;
+
+	/* Get the number of VMs and VCPUs that would be created for testing. */
+	if (argc > 1) {
+		max_vm = strtol(argv[1], NULL, 0);
+		if (max_vm <= 0)
+			max_vm = DEFAULT_NUM_VM;
+	}
+	if (argc > 2) {
+		max_vcpu = strtol(argv[2], NULL, 0);
+		if (max_vcpu <= 0)
+			max_vcpu = DEFAULT_NUM_VCPU;
+	}
+
+	/* Check the extension for binary stats */
+	ret = kvm_check_cap(KVM_CAP_STATS_BINARY_FD);
+	TEST_ASSERT(ret >= 0,
+			"Binary form statistics interface is not supported");
+
+	/* Create VMs and VCPUs */
+	vms = malloc(sizeof(vms[0]) * max_vm);
+	TEST_ASSERT(vms, "Allocate memory for storing VM pointers");
+	for (i = 0; i < max_vm; ++i) {
+		vms[i] = vm_create(VM_MODE_DEFAULT,
+				DEFAULT_GUEST_PHY_PAGES, O_RDWR);
+		for (j = 0; j < max_vcpu; ++j)
+			vm_vcpu_add(vms[i], j);
+	}
+
+	/* Check stats read for every VM and VCPU */
+	for (i = 0; i < max_vm; ++i) {
+		vm_stats_test(vms[i]);
+		for (j = 0; j < max_vcpu; ++j)
+			vcpu_stats_test(vms[i], j);
+	}
+
+	for (i = 0; i < max_vm; ++i)
+		kvm_vm_free(vms[i]);
+	free(vms);
+	return 0;
+}
diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
index fc83f6c5902d..d9e0b2c8b906 100644
--- a/tools/testing/selftests/kvm/lib/kvm_util.c
+++ b/tools/testing/selftests/kvm/lib/kvm_util.c
@@ -2090,3 +2090,15 @@ unsigned int vm_calc_num_guest_pages(enum vm_guest_mode mode, size_t size)
 	n = DIV_ROUND_UP(size, vm_guest_mode_params[mode].page_size);
 	return vm_adjust_num_guest_pages(mode, n);
 }
+
+int vm_get_statsfd(struct kvm_vm *vm)
+{
+	return ioctl(vm->fd, KVM_STATS_GETFD, NULL);
+}
+
+int vcpu_get_statsfd(struct kvm_vm *vm, uint32_t vcpuid)
+{
+	struct vcpu *vcpu = vcpu_find(vm, vcpuid);
+
+	return ioctl(vcpu->fd, KVM_STATS_GETFD, NULL);
+}
-- 
2.31.1.818.g46aad6cb9e-goog

[PATCH v6 4/4] KVM: selftests: Add selftest for KVM statistics data binary interface

[Jing Zhang]

Add selftest to check KVM stats descriptors validity.

Reviewed-by: David Matlack <dmatlack@google.com>
Reviewed-by: Ricardo Koller <ricarkol@google.com>
Signed-off-by: Jing Zhang <jingzhangos@google.com>
---
 tools/testing/selftests/kvm/.gitignore        |   1 +
 tools/testing/selftests/kvm/Makefile          |   3 +
 .../testing/selftests/kvm/include/kvm_util.h  |   3 +
 .../selftests/kvm/kvm_bin_form_stats.c        | 216 ++++++++++++++++++
 tools/testing/selftests/kvm/lib/kvm_util.c    |  12 +
 5 files changed, 235 insertions(+)
 create mode 100644 tools/testing/selftests/kvm/kvm_bin_form_stats.c

diff --git a/tools/testing/selftests/kvm/.gitignore b/tools/testing/selftests/kvm/.gitignore
index bd83158e0e0b..35796667c944 100644
--- a/tools/testing/selftests/kvm/.gitignore
+++ b/tools/testing/selftests/kvm/.gitignore
@@ -43,3 +43,4 @@
 /memslot_modification_stress_test
 /set_memory_region_test
 /steal_time
+/kvm_bin_form_stats
diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
index e439d027939d..2984c86c848a 100644
--- a/tools/testing/selftests/kvm/Makefile
+++ b/tools/testing/selftests/kvm/Makefile
@@ -76,6 +76,7 @@ TEST_GEN_PROGS_x86_64 += kvm_page_table_test
 TEST_GEN_PROGS_x86_64 += memslot_modification_stress_test
 TEST_GEN_PROGS_x86_64 += set_memory_region_test
 TEST_GEN_PROGS_x86_64 += steal_time
+TEST_GEN_PROGS_x86_64 += kvm_bin_form_stats
 
 TEST_GEN_PROGS_aarch64 += aarch64/get-reg-list
 TEST_GEN_PROGS_aarch64 += aarch64/get-reg-list-sve
@@ -87,6 +88,7 @@ TEST_GEN_PROGS_aarch64 += kvm_create_max_vcpus
 TEST_GEN_PROGS_aarch64 += kvm_page_table_test
 TEST_GEN_PROGS_aarch64 += set_memory_region_test
 TEST_GEN_PROGS_aarch64 += steal_time
+TEST_GEN_PROGS_aarch64 += kvm_bin_form_stats
 
 TEST_GEN_PROGS_s390x = s390x/memop
 TEST_GEN_PROGS_s390x += s390x/resets
@@ -96,6 +98,7 @@ TEST_GEN_PROGS_s390x += dirty_log_test
 TEST_GEN_PROGS_s390x += kvm_create_max_vcpus
 TEST_GEN_PROGS_s390x += kvm_page_table_test
 TEST_GEN_PROGS_s390x += set_memory_region_test
+TEST_GEN_PROGS_s390x += kvm_bin_form_stats
 
 TEST_GEN_PROGS += $(TEST_GEN_PROGS_$(UNAME_M))
 LIBKVM += $(LIBKVM_$(UNAME_M))
diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h
index a8f022794ce3..ee01a67022d9 100644
--- a/tools/testing/selftests/kvm/include/kvm_util.h
+++ b/tools/testing/selftests/kvm/include/kvm_util.h
@@ -387,4 +387,7 @@ uint64_t get_ucall(struct kvm_vm *vm, uint32_t vcpu_id, struct ucall *uc);
 #define GUEST_ASSERT_4(_condition, arg1, arg2, arg3, arg4) \
 	__GUEST_ASSERT((_condition), 4, (arg1), (arg2), (arg3), (arg4))
 
+int vm_get_statsfd(struct kvm_vm *vm);
+int vcpu_get_statsfd(struct kvm_vm *vm, uint32_t vcpuid);
+
 #endif /* SELFTEST_KVM_UTIL_H */
diff --git a/tools/testing/selftests/kvm/kvm_bin_form_stats.c b/tools/testing/selftests/kvm/kvm_bin_form_stats.c
new file mode 100644
index 000000000000..09e12c5838af
--- /dev/null
+++ b/tools/testing/selftests/kvm/kvm_bin_form_stats.c
@@ -0,0 +1,216 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * kvm_bin_form_stats
+ *
+ * Copyright (C) 2021, Google LLC.
+ *
+ * Test the fd-based interface for KVM statistics.
+ */
+
+#define _GNU_SOURCE /* for program_invocation_short_name */
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+#include "test_util.h"
+
+#include "kvm_util.h"
+#include "asm/kvm.h"
+#include "linux/kvm.h"
+
+int stats_test(int stats_fd, int size_stat)
+{
+	ssize_t ret;
+	int i;
+	size_t size_desc, size_data = 0;
+	struct kvm_stats_header header;
+	struct kvm_stats_desc *stats_desc, *pdesc;
+	void *stats_data;
+
+	/* Read kvm stats header */
+	ret = read(stats_fd, &header, sizeof(header));
+	TEST_ASSERT(ret == sizeof(header), "Read stats header");
+	size_desc = sizeof(*stats_desc) + header.name_size;
+
+	/* Check id string in header, that should start with "kvm" */
+	TEST_ASSERT(!strncmp(header.id, "kvm", 3) &&
+			strlen(header.id) < KVM_STATS_ID_MAXLEN,
+			"Invalid KVM stats type");
+
+	/* Sanity check for other fields in header */
+	if (header.count == 0)
+		return 0;
+	/* Check overlap */
+	TEST_ASSERT(header.desc_offset > 0 && header.data_offset > 0
+			&& header.desc_offset >= sizeof(header)
+			&& header.data_offset >= sizeof(header),
+			"Invalid offset fields in header");
+	TEST_ASSERT(header.desc_offset > header.data_offset
+			|| (header.desc_offset + size_desc * header.count <=
+				header.data_offset),
+			"Descriptor block is overlapped with data block");
+
+	/* Allocate memory for stats descriptors */
+	stats_desc = calloc(header.count, size_desc);
+	TEST_ASSERT(stats_desc, "Allocate memory for stats descriptors");
+	/* Read kvm stats descriptors */
+	ret = pread(stats_fd, stats_desc,
+			size_desc * header.count, header.desc_offset);
+	TEST_ASSERT(ret == size_desc * header.count,
+			"Read KVM stats descriptors");
+
+	/* Sanity check for fields in descriptors */
+	for (i = 0; i < header.count; ++i) {
+		pdesc = (void *)stats_desc + i * size_desc;
+		/* Check type,unit,base boundaries */
+		TEST_ASSERT((pdesc->flags & KVM_STATS_TYPE_MASK)
+				<= KVM_STATS_TYPE_MAX, "Unknown KVM stats type");
+		TEST_ASSERT((pdesc->flags & KVM_STATS_UNIT_MASK)
+				<= KVM_STATS_UNIT_MAX, "Unknown KVM stats unit");
+		TEST_ASSERT((pdesc->flags & KVM_STATS_BASE_MASK)
+				<= KVM_STATS_BASE_MAX, "Unknown KVM stats base");
+		/* Check exponent for stats unit
+		 * Exponent for counter should be greater than or equal to 0
+		 * Exponent for unit bytes should be greater than or equal to 0
+		 * Exponent for unit seconds should be less than or equal to 0
+		 * Exponent for unit clock cycles should be greater than or
+		 * equal to 0
+		 */
+		switch (pdesc->flags & KVM_STATS_UNIT_MASK) {
+		case KVM_STATS_UNIT_NONE:
+		case KVM_STATS_UNIT_BYTES:
+		case KVM_STATS_UNIT_CYCLES:
+			TEST_ASSERT(pdesc->exponent >= 0,
+					"Unsupported KVM stats unit");
+			break;
+		case KVM_STATS_UNIT_SECONDS:
+			TEST_ASSERT(pdesc->exponent <= 0,
+					"Unsupported KVM stats unit");
+			break;
+		}
+		/* Check name string */
+		TEST_ASSERT(strlen(pdesc->name) < header.name_size,
+				"KVM stats name(%s) too long", pdesc->name);
+		/* Check size field, which should not be zero */
+		TEST_ASSERT(pdesc->size, "KVM descriptor(%s) with size of 0",
+				pdesc->name);
+		size_data += pdesc->size * size_stat;
+	}
+	/* Check overlap */
+	TEST_ASSERT(header.data_offset >= header.desc_offset
+			|| header.data_offset + size_data <= header.desc_offset,
+			"Data block is overlapped with Descriptor block");
+	/* Check validity of all stats data size */
+	TEST_ASSERT(size_data >= header.count * size_stat,
+			"Data size is not correct");
+
+	/* Allocate memory for stats data */
+	stats_data = malloc(size_data);
+	TEST_ASSERT(stats_data, "Allocate memory for stats data");
+	/* Read kvm stats data as a bulk */
+	ret = pread(stats_fd, stats_data, size_data, header.data_offset);
+	TEST_ASSERT(ret == size_data, "Read KVM stats data");
+	/* Read kvm stats data one by one */
+	size_data = 0;
+	for (i = 0; i < header.count; ++i) {
+		pdesc = (void *)stats_desc + i * size_desc;
+		ret = pread(stats_fd, stats_data, pdesc->size * size_stat,
+				header.data_offset + size_data);
+		TEST_ASSERT(ret == pdesc->size * size_stat,
+				"Read data of KVM stats: %s", pdesc->name);
+		size_data += pdesc->size * size_stat;
+	}
+
+	free(stats_data);
+	free(stats_desc);
+	return 0;
+}
+
+
+int vm_stats_test(struct kvm_vm *vm)
+{
+	int stats_fd;
+	struct kvm_vm_stats_data *stats_data;
+
+	/* Get fd for VM stats */
+	stats_fd = vm_get_statsfd(vm);
+	TEST_ASSERT(stats_fd >= 0, "Get VM stats fd");
+
+	stats_test(stats_fd, sizeof(stats_data->value[0]));
+	close(stats_fd);
+
+	return 0;
+}
+
+int vcpu_stats_test(struct kvm_vm *vm, int vcpu_id)
+{
+	int stats_fd;
+	struct kvm_vcpu_stats_data *stats_data;
+
+	/* Get fd for VCPU stats */
+	stats_fd = vcpu_get_statsfd(vm, vcpu_id);
+	TEST_ASSERT(stats_fd >= 0, "Get VCPU stats fd");
+
+	stats_test(stats_fd, sizeof(stats_data->value[0]));
+	close(stats_fd);
+
+	return 0;
+}
+
+#define DEFAULT_NUM_VM		4
+#define DEFAULT_NUM_VCPU	4
+
+/*
+ * Usage: kvm_bin_form_stats [#vm] [#vcpu]
+ * The first parameter #vm set the number of VMs being created.
+ * The second parameter #vcpu set the number of VCPUs being created.
+ * By default, DEFAULT_NUM_VM VM and DEFAULT_NUM_VCPU VCPU for the VM would be
+ * created for testing.
+ */
+
+int main(int argc, char *argv[])
+{
+	int max_vm = DEFAULT_NUM_VM, max_vcpu = DEFAULT_NUM_VCPU, ret, i, j;
+	struct kvm_vm **vms;
+
+	/* Get the number of VMs and VCPUs that would be created for testing. */
+	if (argc > 1) {
+		max_vm = strtol(argv[1], NULL, 0);
+		if (max_vm <= 0)
+			max_vm = DEFAULT_NUM_VM;
+	}
+	if (argc > 2) {
+		max_vcpu = strtol(argv[2], NULL, 0);
+		if (max_vcpu <= 0)
+			max_vcpu = DEFAULT_NUM_VCPU;
+	}
+
+	/* Check the extension for binary stats */
+	ret = kvm_check_cap(KVM_CAP_STATS_BINARY_FD);
+	TEST_ASSERT(ret >= 0,
+			"Binary form statistics interface is not supported");
+
+	/* Create VMs and VCPUs */
+	vms = malloc(sizeof(vms[0]) * max_vm);
+	TEST_ASSERT(vms, "Allocate memory for storing VM pointers");
+	for (i = 0; i < max_vm; ++i) {
+		vms[i] = vm_create(VM_MODE_DEFAULT,
+				DEFAULT_GUEST_PHY_PAGES, O_RDWR);
+		for (j = 0; j < max_vcpu; ++j)
+			vm_vcpu_add(vms[i], j);
+	}
+
+	/* Check stats read for every VM and VCPU */
+	for (i = 0; i < max_vm; ++i) {
+		vm_stats_test(vms[i]);
+		for (j = 0; j < max_vcpu; ++j)
+			vcpu_stats_test(vms[i], j);
+	}
+
+	for (i = 0; i < max_vm; ++i)
+		kvm_vm_free(vms[i]);
+	free(vms);
+	return 0;
+}
diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
index fc83f6c5902d..d9e0b2c8b906 100644
--- a/tools/testing/selftests/kvm/lib/kvm_util.c
+++ b/tools/testing/selftests/kvm/lib/kvm_util.c
@@ -2090,3 +2090,15 @@ unsigned int vm_calc_num_guest_pages(enum vm_guest_mode mode, size_t size)
 	n = DIV_ROUND_UP(size, vm_guest_mode_params[mode].page_size);
 	return vm_adjust_num_guest_pages(mode, n);
 }
+
+int vm_get_statsfd(struct kvm_vm *vm)
+{
+	return ioctl(vm->fd, KVM_STATS_GETFD, NULL);
+}
+
+int vcpu_get_statsfd(struct kvm_vm *vm, uint32_t vcpuid)
+{
+	struct vcpu *vcpu = vcpu_find(vm, vcpuid);
+
+	return ioctl(vcpu->fd, KVM_STATS_GETFD, NULL);
+}
-- 
2.31.1.818.g46aad6cb9e-goog

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

Re: [PATCH v6 4/4] KVM: selftests: Add selftest for KVM statistics data binary interface

[David Matlack]

On Mon, May 24, 2021 at 8:18 AM Jing Zhang <jingzhangos@google.com> wrote:
>
> Add selftest to check KVM stats descriptors validity.
>
> Reviewed-by: David Matlack <dmatlack@google.com>
> Reviewed-by: Ricardo Koller <ricarkol@google.com>
> Signed-off-by: Jing Zhang <jingzhangos@google.com>

Reviewed-by: David Matlack <dmatlack@google.com>

> ---
>  tools/testing/selftests/kvm/.gitignore        |   1 +
>  tools/testing/selftests/kvm/Makefile          |   3 +
>  .../testing/selftests/kvm/include/kvm_util.h  |   3 +
>  .../selftests/kvm/kvm_bin_form_stats.c        | 216 ++++++++++++++++++
>  tools/testing/selftests/kvm/lib/kvm_util.c    |  12 +
>  5 files changed, 235 insertions(+)
>  create mode 100644 tools/testing/selftests/kvm/kvm_bin_form_stats.c
>
> diff --git a/tools/testing/selftests/kvm/.gitignore b/tools/testing/selftests/kvm/.gitignore
> index bd83158e0e0b..35796667c944 100644
> --- a/tools/testing/selftests/kvm/.gitignore
> +++ b/tools/testing/selftests/kvm/.gitignore
> @@ -43,3 +43,4 @@
>  /memslot_modification_stress_test
>  /set_memory_region_test
>  /steal_time
> +/kvm_bin_form_stats
> diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
> index e439d027939d..2984c86c848a 100644
> --- a/tools/testing/selftests/kvm/Makefile
> +++ b/tools/testing/selftests/kvm/Makefile
> @@ -76,6 +76,7 @@ TEST_GEN_PROGS_x86_64 += kvm_page_table_test
>  TEST_GEN_PROGS_x86_64 += memslot_modification_stress_test
>  TEST_GEN_PROGS_x86_64 += set_memory_region_test
>  TEST_GEN_PROGS_x86_64 += steal_time
> +TEST_GEN_PROGS_x86_64 += kvm_bin_form_stats
>
>  TEST_GEN_PROGS_aarch64 += aarch64/get-reg-list
>  TEST_GEN_PROGS_aarch64 += aarch64/get-reg-list-sve
> @@ -87,6 +88,7 @@ TEST_GEN_PROGS_aarch64 += kvm_create_max_vcpus
>  TEST_GEN_PROGS_aarch64 += kvm_page_table_test
>  TEST_GEN_PROGS_aarch64 += set_memory_region_test
>  TEST_GEN_PROGS_aarch64 += steal_time
> +TEST_GEN_PROGS_aarch64 += kvm_bin_form_stats
>
>  TEST_GEN_PROGS_s390x = s390x/memop
>  TEST_GEN_PROGS_s390x += s390x/resets
> @@ -96,6 +98,7 @@ TEST_GEN_PROGS_s390x += dirty_log_test
>  TEST_GEN_PROGS_s390x += kvm_create_max_vcpus
>  TEST_GEN_PROGS_s390x += kvm_page_table_test
>  TEST_GEN_PROGS_s390x += set_memory_region_test
> +TEST_GEN_PROGS_s390x += kvm_bin_form_stats
>
>  TEST_GEN_PROGS += $(TEST_GEN_PROGS_$(UNAME_M))
>  LIBKVM += $(LIBKVM_$(UNAME_M))
> diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h
> index a8f022794ce3..ee01a67022d9 100644
> --- a/tools/testing/selftests/kvm/include/kvm_util.h
> +++ b/tools/testing/selftests/kvm/include/kvm_util.h
> @@ -387,4 +387,7 @@ uint64_t get_ucall(struct kvm_vm *vm, uint32_t vcpu_id, struct ucall *uc);
>  #define GUEST_ASSERT_4(_condition, arg1, arg2, arg3, arg4) \
>         __GUEST_ASSERT((_condition), 4, (arg1), (arg2), (arg3), (arg4))
>
> +int vm_get_statsfd(struct kvm_vm *vm);
> +int vcpu_get_statsfd(struct kvm_vm *vm, uint32_t vcpuid);
> +
>  #endif /* SELFTEST_KVM_UTIL_H */
> diff --git a/tools/testing/selftests/kvm/kvm_bin_form_stats.c b/tools/testing/selftests/kvm/kvm_bin_form_stats.c
> new file mode 100644
> index 000000000000..09e12c5838af
> --- /dev/null
> +++ b/tools/testing/selftests/kvm/kvm_bin_form_stats.c
> @@ -0,0 +1,216 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * kvm_bin_form_stats
> + *
> + * Copyright (C) 2021, Google LLC.
> + *
> + * Test the fd-based interface for KVM statistics.
> + */
> +
> +#define _GNU_SOURCE /* for program_invocation_short_name */
> +#include <fcntl.h>
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <string.h>
> +#include <errno.h>
> +
> +#include "test_util.h"
> +
> +#include "kvm_util.h"
> +#include "asm/kvm.h"
> +#include "linux/kvm.h"
> +
> +int stats_test(int stats_fd, int size_stat)
> +{
> +       ssize_t ret;
> +       int i;
> +       size_t size_desc, size_data = 0;
> +       struct kvm_stats_header header;
> +       struct kvm_stats_desc *stats_desc, *pdesc;
> +       void *stats_data;
> +
> +       /* Read kvm stats header */
> +       ret = read(stats_fd, &header, sizeof(header));
> +       TEST_ASSERT(ret == sizeof(header), "Read stats header");
> +       size_desc = sizeof(*stats_desc) + header.name_size;
> +
> +       /* Check id string in header, that should start with "kvm" */
> +       TEST_ASSERT(!strncmp(header.id, "kvm", 3) &&
> +                       strlen(header.id) < KVM_STATS_ID_MAXLEN,
> +                       "Invalid KVM stats type");
> +
> +       /* Sanity check for other fields in header */
> +       if (header.count == 0)
> +               return 0;
> +       /* Check overlap */
> +       TEST_ASSERT(header.desc_offset > 0 && header.data_offset > 0
> +                       && header.desc_offset >= sizeof(header)
> +                       && header.data_offset >= sizeof(header),
> +                       "Invalid offset fields in header");
> +       TEST_ASSERT(header.desc_offset > header.data_offset
> +                       || (header.desc_offset + size_desc * header.count <=
> +                               header.data_offset),
> +                       "Descriptor block is overlapped with data block");
> +
> +       /* Allocate memory for stats descriptors */
> +       stats_desc = calloc(header.count, size_desc);
> +       TEST_ASSERT(stats_desc, "Allocate memory for stats descriptors");
> +       /* Read kvm stats descriptors */
> +       ret = pread(stats_fd, stats_desc,
> +                       size_desc * header.count, header.desc_offset);
> +       TEST_ASSERT(ret == size_desc * header.count,
> +                       "Read KVM stats descriptors");
> +
> +       /* Sanity check for fields in descriptors */
> +       for (i = 0; i < header.count; ++i) {
> +               pdesc = (void *)stats_desc + i * size_desc;
> +               /* Check type,unit,base boundaries */
> +               TEST_ASSERT((pdesc->flags & KVM_STATS_TYPE_MASK)
> +                               <= KVM_STATS_TYPE_MAX, "Unknown KVM stats type");
> +               TEST_ASSERT((pdesc->flags & KVM_STATS_UNIT_MASK)
> +                               <= KVM_STATS_UNIT_MAX, "Unknown KVM stats unit");
> +               TEST_ASSERT((pdesc->flags & KVM_STATS_BASE_MASK)
> +                               <= KVM_STATS_BASE_MAX, "Unknown KVM stats base");
> +               /* Check exponent for stats unit
> +                * Exponent for counter should be greater than or equal to 0
> +                * Exponent for unit bytes should be greater than or equal to 0
> +                * Exponent for unit seconds should be less than or equal to 0
> +                * Exponent for unit clock cycles should be greater than or
> +                * equal to 0
> +                */
> +               switch (pdesc->flags & KVM_STATS_UNIT_MASK) {
> +               case KVM_STATS_UNIT_NONE:
> +               case KVM_STATS_UNIT_BYTES:
> +               case KVM_STATS_UNIT_CYCLES:
> +                       TEST_ASSERT(pdesc->exponent >= 0,
> +                                       "Unsupported KVM stats unit");
> +                       break;
> +               case KVM_STATS_UNIT_SECONDS:
> +                       TEST_ASSERT(pdesc->exponent <= 0,
> +                                       "Unsupported KVM stats unit");
> +                       break;
> +               }
> +               /* Check name string */
> +               TEST_ASSERT(strlen(pdesc->name) < header.name_size,
> +                               "KVM stats name(%s) too long", pdesc->name);
> +               /* Check size field, which should not be zero */
> +               TEST_ASSERT(pdesc->size, "KVM descriptor(%s) with size of 0",
> +                               pdesc->name);
> +               size_data += pdesc->size * size_stat;
> +       }
> +       /* Check overlap */
> +       TEST_ASSERT(header.data_offset >= header.desc_offset
> +                       || header.data_offset + size_data <= header.desc_offset,
> +                       "Data block is overlapped with Descriptor block");
> +       /* Check validity of all stats data size */
> +       TEST_ASSERT(size_data >= header.count * size_stat,
> +                       "Data size is not correct");
> +
> +       /* Allocate memory for stats data */
> +       stats_data = malloc(size_data);
> +       TEST_ASSERT(stats_data, "Allocate memory for stats data");
> +       /* Read kvm stats data as a bulk */
> +       ret = pread(stats_fd, stats_data, size_data, header.data_offset);
> +       TEST_ASSERT(ret == size_data, "Read KVM stats data");
> +       /* Read kvm stats data one by one */
> +       size_data = 0;
> +       for (i = 0; i < header.count; ++i) {
> +               pdesc = (void *)stats_desc + i * size_desc;
> +               ret = pread(stats_fd, stats_data, pdesc->size * size_stat,
> +                               header.data_offset + size_data);
> +               TEST_ASSERT(ret == pdesc->size * size_stat,
> +                               "Read data of KVM stats: %s", pdesc->name);
> +               size_data += pdesc->size * size_stat;
> +       }
> +
> +       free(stats_data);
> +       free(stats_desc);
> +       return 0;
> +}
> +
> +
> +int vm_stats_test(struct kvm_vm *vm)
> +{
> +       int stats_fd;
> +       struct kvm_vm_stats_data *stats_data;
> +
> +       /* Get fd for VM stats */
> +       stats_fd = vm_get_statsfd(vm);
> +       TEST_ASSERT(stats_fd >= 0, "Get VM stats fd");
> +
> +       stats_test(stats_fd, sizeof(stats_data->value[0]));
> +       close(stats_fd);
> +
> +       return 0;
> +}
> +
> +int vcpu_stats_test(struct kvm_vm *vm, int vcpu_id)
> +{
> +       int stats_fd;
> +       struct kvm_vcpu_stats_data *stats_data;
> +
> +       /* Get fd for VCPU stats */
> +       stats_fd = vcpu_get_statsfd(vm, vcpu_id);
> +       TEST_ASSERT(stats_fd >= 0, "Get VCPU stats fd");
> +
> +       stats_test(stats_fd, sizeof(stats_data->value[0]));
> +       close(stats_fd);
> +
> +       return 0;
> +}
> +
> +#define DEFAULT_NUM_VM         4
> +#define DEFAULT_NUM_VCPU       4
> +
> +/*
> + * Usage: kvm_bin_form_stats [#vm] [#vcpu]
> + * The first parameter #vm set the number of VMs being created.
> + * The second parameter #vcpu set the number of VCPUs being created.
> + * By default, DEFAULT_NUM_VM VM and DEFAULT_NUM_VCPU VCPU for the VM would be
> + * created for testing.
> + */
> +
> +int main(int argc, char *argv[])
> +{
> +       int max_vm = DEFAULT_NUM_VM, max_vcpu = DEFAULT_NUM_VCPU, ret, i, j;
> +       struct kvm_vm **vms;
> +
> +       /* Get the number of VMs and VCPUs that would be created for testing. */
> +       if (argc > 1) {
> +               max_vm = strtol(argv[1], NULL, 0);
> +               if (max_vm <= 0)
> +                       max_vm = DEFAULT_NUM_VM;
> +       }
> +       if (argc > 2) {
> +               max_vcpu = strtol(argv[2], NULL, 0);
> +               if (max_vcpu <= 0)
> +                       max_vcpu = DEFAULT_NUM_VCPU;
> +       }
> +
> +       /* Check the extension for binary stats */
> +       ret = kvm_check_cap(KVM_CAP_STATS_BINARY_FD);
> +       TEST_ASSERT(ret >= 0,
> +                       "Binary form statistics interface is not supported");
> +
> +       /* Create VMs and VCPUs */
> +       vms = malloc(sizeof(vms[0]) * max_vm);
> +       TEST_ASSERT(vms, "Allocate memory for storing VM pointers");
> +       for (i = 0; i < max_vm; ++i) {
> +               vms[i] = vm_create(VM_MODE_DEFAULT,
> +                               DEFAULT_GUEST_PHY_PAGES, O_RDWR);
> +               for (j = 0; j < max_vcpu; ++j)
> +                       vm_vcpu_add(vms[i], j);
> +       }
> +
> +       /* Check stats read for every VM and VCPU */
> +       for (i = 0; i < max_vm; ++i) {
> +               vm_stats_test(vms[i]);
> +               for (j = 0; j < max_vcpu; ++j)
> +                       vcpu_stats_test(vms[i], j);
> +       }
> +
> +       for (i = 0; i < max_vm; ++i)
> +               kvm_vm_free(vms[i]);
> +       free(vms);
> +       return 0;
> +}
> diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
> index fc83f6c5902d..d9e0b2c8b906 100644
> --- a/tools/testing/selftests/kvm/lib/kvm_util.c
> +++ b/tools/testing/selftests/kvm/lib/kvm_util.c
> @@ -2090,3 +2090,15 @@ unsigned int vm_calc_num_guest_pages(enum vm_guest_mode mode, size_t size)
>         n = DIV_ROUND_UP(size, vm_guest_mode_params[mode].page_size);
>         return vm_adjust_num_guest_pages(mode, n);
>  }
> +
> +int vm_get_statsfd(struct kvm_vm *vm)
> +{
> +       return ioctl(vm->fd, KVM_STATS_GETFD, NULL);
> +}
> +
> +int vcpu_get_statsfd(struct kvm_vm *vm, uint32_t vcpuid)
> +{
> +       struct vcpu *vcpu = vcpu_find(vm, vcpuid);
> +
> +       return ioctl(vcpu->fd, KVM_STATS_GETFD, NULL);
> +}
> --
> 2.31.1.818.g46aad6cb9e-goog
>

Re: [PATCH v6 4/4] KVM: selftests: Add selftest for KVM statistics data binary interface

[David Matlack]

On Mon, May 24, 2021 at 8:18 AM Jing Zhang <jingzhangos@google.com> wrote:
>
> Add selftest to check KVM stats descriptors validity.
>
> Reviewed-by: David Matlack <dmatlack@google.com>
> Reviewed-by: Ricardo Koller <ricarkol@google.com>
> Signed-off-by: Jing Zhang <jingzhangos@google.com>

Reviewed-by: David Matlack <dmatlack@google.com>

> ---
>  tools/testing/selftests/kvm/.gitignore        |   1 +
>  tools/testing/selftests/kvm/Makefile          |   3 +
>  .../testing/selftests/kvm/include/kvm_util.h  |   3 +
>  .../selftests/kvm/kvm_bin_form_stats.c        | 216 ++++++++++++++++++
>  tools/testing/selftests/kvm/lib/kvm_util.c    |  12 +
>  5 files changed, 235 insertions(+)
>  create mode 100644 tools/testing/selftests/kvm/kvm_bin_form_stats.c
>
> diff --git a/tools/testing/selftests/kvm/.gitignore b/tools/testing/selftests/kvm/.gitignore
> index bd83158e0e0b..35796667c944 100644
> --- a/tools/testing/selftests/kvm/.gitignore
> +++ b/tools/testing/selftests/kvm/.gitignore
> @@ -43,3 +43,4 @@
>  /memslot_modification_stress_test
>  /set_memory_region_test
>  /steal_time
> +/kvm_bin_form_stats
> diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
> index e439d027939d..2984c86c848a 100644
> --- a/tools/testing/selftests/kvm/Makefile
> +++ b/tools/testing/selftests/kvm/Makefile
> @@ -76,6 +76,7 @@ TEST_GEN_PROGS_x86_64 += kvm_page_table_test
>  TEST_GEN_PROGS_x86_64 += memslot_modification_stress_test
>  TEST_GEN_PROGS_x86_64 += set_memory_region_test
>  TEST_GEN_PROGS_x86_64 += steal_time
> +TEST_GEN_PROGS_x86_64 += kvm_bin_form_stats
>
>  TEST_GEN_PROGS_aarch64 += aarch64/get-reg-list
>  TEST_GEN_PROGS_aarch64 += aarch64/get-reg-list-sve
> @@ -87,6 +88,7 @@ TEST_GEN_PROGS_aarch64 += kvm_create_max_vcpus
>  TEST_GEN_PROGS_aarch64 += kvm_page_table_test
>  TEST_GEN_PROGS_aarch64 += set_memory_region_test
>  TEST_GEN_PROGS_aarch64 += steal_time
> +TEST_GEN_PROGS_aarch64 += kvm_bin_form_stats
>
>  TEST_GEN_PROGS_s390x = s390x/memop
>  TEST_GEN_PROGS_s390x += s390x/resets
> @@ -96,6 +98,7 @@ TEST_GEN_PROGS_s390x += dirty_log_test
>  TEST_GEN_PROGS_s390x += kvm_create_max_vcpus
>  TEST_GEN_PROGS_s390x += kvm_page_table_test
>  TEST_GEN_PROGS_s390x += set_memory_region_test
> +TEST_GEN_PROGS_s390x += kvm_bin_form_stats
>
>  TEST_GEN_PROGS += $(TEST_GEN_PROGS_$(UNAME_M))
>  LIBKVM += $(LIBKVM_$(UNAME_M))
> diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h
> index a8f022794ce3..ee01a67022d9 100644
> --- a/tools/testing/selftests/kvm/include/kvm_util.h
> +++ b/tools/testing/selftests/kvm/include/kvm_util.h
> @@ -387,4 +387,7 @@ uint64_t get_ucall(struct kvm_vm *vm, uint32_t vcpu_id, struct ucall *uc);
>  #define GUEST_ASSERT_4(_condition, arg1, arg2, arg3, arg4) \
>         __GUEST_ASSERT((_condition), 4, (arg1), (arg2), (arg3), (arg4))
>
> +int vm_get_statsfd(struct kvm_vm *vm);
> +int vcpu_get_statsfd(struct kvm_vm *vm, uint32_t vcpuid);
> +
>  #endif /* SELFTEST_KVM_UTIL_H */
> diff --git a/tools/testing/selftests/kvm/kvm_bin_form_stats.c b/tools/testing/selftests/kvm/kvm_bin_form_stats.c
> new file mode 100644
> index 000000000000..09e12c5838af
> --- /dev/null
> +++ b/tools/testing/selftests/kvm/kvm_bin_form_stats.c
> @@ -0,0 +1,216 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * kvm_bin_form_stats
> + *
> + * Copyright (C) 2021, Google LLC.
> + *
> + * Test the fd-based interface for KVM statistics.
> + */
> +
> +#define _GNU_SOURCE /* for program_invocation_short_name */
> +#include <fcntl.h>
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <string.h>
> +#include <errno.h>
> +
> +#include "test_util.h"
> +
> +#include "kvm_util.h"
> +#include "asm/kvm.h"
> +#include "linux/kvm.h"
> +
> +int stats_test(int stats_fd, int size_stat)
> +{
> +       ssize_t ret;
> +       int i;
> +       size_t size_desc, size_data = 0;
> +       struct kvm_stats_header header;
> +       struct kvm_stats_desc *stats_desc, *pdesc;
> +       void *stats_data;
> +
> +       /* Read kvm stats header */
> +       ret = read(stats_fd, &header, sizeof(header));
> +       TEST_ASSERT(ret = sizeof(header), "Read stats header");
> +       size_desc = sizeof(*stats_desc) + header.name_size;
> +
> +       /* Check id string in header, that should start with "kvm" */
> +       TEST_ASSERT(!strncmp(header.id, "kvm", 3) &&
> +                       strlen(header.id) < KVM_STATS_ID_MAXLEN,
> +                       "Invalid KVM stats type");
> +
> +       /* Sanity check for other fields in header */
> +       if (header.count = 0)
> +               return 0;
> +       /* Check overlap */
> +       TEST_ASSERT(header.desc_offset > 0 && header.data_offset > 0
> +                       && header.desc_offset >= sizeof(header)
> +                       && header.data_offset >= sizeof(header),
> +                       "Invalid offset fields in header");
> +       TEST_ASSERT(header.desc_offset > header.data_offset
> +                       || (header.desc_offset + size_desc * header.count <> +                               header.data_offset),
> +                       "Descriptor block is overlapped with data block");
> +
> +       /* Allocate memory for stats descriptors */
> +       stats_desc = calloc(header.count, size_desc);
> +       TEST_ASSERT(stats_desc, "Allocate memory for stats descriptors");
> +       /* Read kvm stats descriptors */
> +       ret = pread(stats_fd, stats_desc,
> +                       size_desc * header.count, header.desc_offset);
> +       TEST_ASSERT(ret = size_desc * header.count,
> +                       "Read KVM stats descriptors");
> +
> +       /* Sanity check for fields in descriptors */
> +       for (i = 0; i < header.count; ++i) {
> +               pdesc = (void *)stats_desc + i * size_desc;
> +               /* Check type,unit,base boundaries */
> +               TEST_ASSERT((pdesc->flags & KVM_STATS_TYPE_MASK)
> +                               <= KVM_STATS_TYPE_MAX, "Unknown KVM stats type");
> +               TEST_ASSERT((pdesc->flags & KVM_STATS_UNIT_MASK)
> +                               <= KVM_STATS_UNIT_MAX, "Unknown KVM stats unit");
> +               TEST_ASSERT((pdesc->flags & KVM_STATS_BASE_MASK)
> +                               <= KVM_STATS_BASE_MAX, "Unknown KVM stats base");
> +               /* Check exponent for stats unit
> +                * Exponent for counter should be greater than or equal to 0
> +                * Exponent for unit bytes should be greater than or equal to 0
> +                * Exponent for unit seconds should be less than or equal to 0
> +                * Exponent for unit clock cycles should be greater than or
> +                * equal to 0
> +                */
> +               switch (pdesc->flags & KVM_STATS_UNIT_MASK) {
> +               case KVM_STATS_UNIT_NONE:
> +               case KVM_STATS_UNIT_BYTES:
> +               case KVM_STATS_UNIT_CYCLES:
> +                       TEST_ASSERT(pdesc->exponent >= 0,
> +                                       "Unsupported KVM stats unit");
> +                       break;
> +               case KVM_STATS_UNIT_SECONDS:
> +                       TEST_ASSERT(pdesc->exponent <= 0,
> +                                       "Unsupported KVM stats unit");
> +                       break;
> +               }
> +               /* Check name string */
> +               TEST_ASSERT(strlen(pdesc->name) < header.name_size,
> +                               "KVM stats name(%s) too long", pdesc->name);
> +               /* Check size field, which should not be zero */
> +               TEST_ASSERT(pdesc->size, "KVM descriptor(%s) with size of 0",
> +                               pdesc->name);
> +               size_data += pdesc->size * size_stat;
> +       }
> +       /* Check overlap */
> +       TEST_ASSERT(header.data_offset >= header.desc_offset
> +                       || header.data_offset + size_data <= header.desc_offset,
> +                       "Data block is overlapped with Descriptor block");
> +       /* Check validity of all stats data size */
> +       TEST_ASSERT(size_data >= header.count * size_stat,
> +                       "Data size is not correct");
> +
> +       /* Allocate memory for stats data */
> +       stats_data = malloc(size_data);
> +       TEST_ASSERT(stats_data, "Allocate memory for stats data");
> +       /* Read kvm stats data as a bulk */
> +       ret = pread(stats_fd, stats_data, size_data, header.data_offset);
> +       TEST_ASSERT(ret = size_data, "Read KVM stats data");
> +       /* Read kvm stats data one by one */
> +       size_data = 0;
> +       for (i = 0; i < header.count; ++i) {
> +               pdesc = (void *)stats_desc + i * size_desc;
> +               ret = pread(stats_fd, stats_data, pdesc->size * size_stat,
> +                               header.data_offset + size_data);
> +               TEST_ASSERT(ret = pdesc->size * size_stat,
> +                               "Read data of KVM stats: %s", pdesc->name);
> +               size_data += pdesc->size * size_stat;
> +       }
> +
> +       free(stats_data);
> +       free(stats_desc);
> +       return 0;
> +}
> +
> +
> +int vm_stats_test(struct kvm_vm *vm)
> +{
> +       int stats_fd;
> +       struct kvm_vm_stats_data *stats_data;
> +
> +       /* Get fd for VM stats */
> +       stats_fd = vm_get_statsfd(vm);
> +       TEST_ASSERT(stats_fd >= 0, "Get VM stats fd");
> +
> +       stats_test(stats_fd, sizeof(stats_data->value[0]));
> +       close(stats_fd);
> +
> +       return 0;
> +}
> +
> +int vcpu_stats_test(struct kvm_vm *vm, int vcpu_id)
> +{
> +       int stats_fd;
> +       struct kvm_vcpu_stats_data *stats_data;
> +
> +       /* Get fd for VCPU stats */
> +       stats_fd = vcpu_get_statsfd(vm, vcpu_id);
> +       TEST_ASSERT(stats_fd >= 0, "Get VCPU stats fd");
> +
> +       stats_test(stats_fd, sizeof(stats_data->value[0]));
> +       close(stats_fd);
> +
> +       return 0;
> +}
> +
> +#define DEFAULT_NUM_VM         4
> +#define DEFAULT_NUM_VCPU       4
> +
> +/*
> + * Usage: kvm_bin_form_stats [#vm] [#vcpu]
> + * The first parameter #vm set the number of VMs being created.
> + * The second parameter #vcpu set the number of VCPUs being created.
> + * By default, DEFAULT_NUM_VM VM and DEFAULT_NUM_VCPU VCPU for the VM would be
> + * created for testing.
> + */
> +
> +int main(int argc, char *argv[])
> +{
> +       int max_vm = DEFAULT_NUM_VM, max_vcpu = DEFAULT_NUM_VCPU, ret, i, j;
> +       struct kvm_vm **vms;
> +
> +       /* Get the number of VMs and VCPUs that would be created for testing. */
> +       if (argc > 1) {
> +               max_vm = strtol(argv[1], NULL, 0);
> +               if (max_vm <= 0)
> +                       max_vm = DEFAULT_NUM_VM;
> +       }
> +       if (argc > 2) {
> +               max_vcpu = strtol(argv[2], NULL, 0);
> +               if (max_vcpu <= 0)
> +                       max_vcpu = DEFAULT_NUM_VCPU;
> +       }
> +
> +       /* Check the extension for binary stats */
> +       ret = kvm_check_cap(KVM_CAP_STATS_BINARY_FD);
> +       TEST_ASSERT(ret >= 0,
> +                       "Binary form statistics interface is not supported");
> +
> +       /* Create VMs and VCPUs */
> +       vms = malloc(sizeof(vms[0]) * max_vm);
> +       TEST_ASSERT(vms, "Allocate memory for storing VM pointers");
> +       for (i = 0; i < max_vm; ++i) {
> +               vms[i] = vm_create(VM_MODE_DEFAULT,
> +                               DEFAULT_GUEST_PHY_PAGES, O_RDWR);
> +               for (j = 0; j < max_vcpu; ++j)
> +                       vm_vcpu_add(vms[i], j);
> +       }
> +
> +       /* Check stats read for every VM and VCPU */
> +       for (i = 0; i < max_vm; ++i) {
> +               vm_stats_test(vms[i]);
> +               for (j = 0; j < max_vcpu; ++j)
> +                       vcpu_stats_test(vms[i], j);
> +       }
> +
> +       for (i = 0; i < max_vm; ++i)
> +               kvm_vm_free(vms[i]);
> +       free(vms);
> +       return 0;
> +}
> diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
> index fc83f6c5902d..d9e0b2c8b906 100644
> --- a/tools/testing/selftests/kvm/lib/kvm_util.c
> +++ b/tools/testing/selftests/kvm/lib/kvm_util.c
> @@ -2090,3 +2090,15 @@ unsigned int vm_calc_num_guest_pages(enum vm_guest_mode mode, size_t size)
>         n = DIV_ROUND_UP(size, vm_guest_mode_params[mode].page_size);
>         return vm_adjust_num_guest_pages(mode, n);
>  }
> +
> +int vm_get_statsfd(struct kvm_vm *vm)
> +{
> +       return ioctl(vm->fd, KVM_STATS_GETFD, NULL);
> +}
> +
> +int vcpu_get_statsfd(struct kvm_vm *vm, uint32_t vcpuid)
> +{
> +       struct vcpu *vcpu = vcpu_find(vm, vcpuid);
> +
> +       return ioctl(vcpu->fd, KVM_STATS_GETFD, NULL);
> +}
> --
> 2.31.1.818.g46aad6cb9e-goog
>

Re: [PATCH v6 4/4] KVM: selftests: Add selftest for KVM statistics data binary interface

[David Matlack]

On Mon, May 24, 2021 at 8:18 AM Jing Zhang <jingzhangos@google.com> wrote:
>
> Add selftest to check KVM stats descriptors validity.
>
> Reviewed-by: David Matlack <dmatlack@google.com>
> Reviewed-by: Ricardo Koller <ricarkol@google.com>
> Signed-off-by: Jing Zhang <jingzhangos@google.com>

Reviewed-by: David Matlack <dmatlack@google.com>

> ---
>  tools/testing/selftests/kvm/.gitignore        |   1 +
>  tools/testing/selftests/kvm/Makefile          |   3 +
>  .../testing/selftests/kvm/include/kvm_util.h  |   3 +
>  .../selftests/kvm/kvm_bin_form_stats.c        | 216 ++++++++++++++++++
>  tools/testing/selftests/kvm/lib/kvm_util.c    |  12 +
>  5 files changed, 235 insertions(+)
>  create mode 100644 tools/testing/selftests/kvm/kvm_bin_form_stats.c
>
> diff --git a/tools/testing/selftests/kvm/.gitignore b/tools/testing/selftests/kvm/.gitignore
> index bd83158e0e0b..35796667c944 100644
> --- a/tools/testing/selftests/kvm/.gitignore
> +++ b/tools/testing/selftests/kvm/.gitignore
> @@ -43,3 +43,4 @@
>  /memslot_modification_stress_test
>  /set_memory_region_test
>  /steal_time
> +/kvm_bin_form_stats
> diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
> index e439d027939d..2984c86c848a 100644
> --- a/tools/testing/selftests/kvm/Makefile
> +++ b/tools/testing/selftests/kvm/Makefile
> @@ -76,6 +76,7 @@ TEST_GEN_PROGS_x86_64 += kvm_page_table_test
>  TEST_GEN_PROGS_x86_64 += memslot_modification_stress_test
>  TEST_GEN_PROGS_x86_64 += set_memory_region_test
>  TEST_GEN_PROGS_x86_64 += steal_time
> +TEST_GEN_PROGS_x86_64 += kvm_bin_form_stats
>
>  TEST_GEN_PROGS_aarch64 += aarch64/get-reg-list
>  TEST_GEN_PROGS_aarch64 += aarch64/get-reg-list-sve
> @@ -87,6 +88,7 @@ TEST_GEN_PROGS_aarch64 += kvm_create_max_vcpus
>  TEST_GEN_PROGS_aarch64 += kvm_page_table_test
>  TEST_GEN_PROGS_aarch64 += set_memory_region_test
>  TEST_GEN_PROGS_aarch64 += steal_time
> +TEST_GEN_PROGS_aarch64 += kvm_bin_form_stats
>
>  TEST_GEN_PROGS_s390x = s390x/memop
>  TEST_GEN_PROGS_s390x += s390x/resets
> @@ -96,6 +98,7 @@ TEST_GEN_PROGS_s390x += dirty_log_test
>  TEST_GEN_PROGS_s390x += kvm_create_max_vcpus
>  TEST_GEN_PROGS_s390x += kvm_page_table_test
>  TEST_GEN_PROGS_s390x += set_memory_region_test
> +TEST_GEN_PROGS_s390x += kvm_bin_form_stats
>
>  TEST_GEN_PROGS += $(TEST_GEN_PROGS_$(UNAME_M))
>  LIBKVM += $(LIBKVM_$(UNAME_M))
> diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h
> index a8f022794ce3..ee01a67022d9 100644
> --- a/tools/testing/selftests/kvm/include/kvm_util.h
> +++ b/tools/testing/selftests/kvm/include/kvm_util.h
> @@ -387,4 +387,7 @@ uint64_t get_ucall(struct kvm_vm *vm, uint32_t vcpu_id, struct ucall *uc);
>  #define GUEST_ASSERT_4(_condition, arg1, arg2, arg3, arg4) \
>         __GUEST_ASSERT((_condition), 4, (arg1), (arg2), (arg3), (arg4))
>
> +int vm_get_statsfd(struct kvm_vm *vm);
> +int vcpu_get_statsfd(struct kvm_vm *vm, uint32_t vcpuid);
> +
>  #endif /* SELFTEST_KVM_UTIL_H */
> diff --git a/tools/testing/selftests/kvm/kvm_bin_form_stats.c b/tools/testing/selftests/kvm/kvm_bin_form_stats.c
> new file mode 100644
> index 000000000000..09e12c5838af
> --- /dev/null
> +++ b/tools/testing/selftests/kvm/kvm_bin_form_stats.c
> @@ -0,0 +1,216 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * kvm_bin_form_stats
> + *
> + * Copyright (C) 2021, Google LLC.
> + *
> + * Test the fd-based interface for KVM statistics.
> + */
> +
> +#define _GNU_SOURCE /* for program_invocation_short_name */
> +#include <fcntl.h>
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <string.h>
> +#include <errno.h>
> +
> +#include "test_util.h"
> +
> +#include "kvm_util.h"
> +#include "asm/kvm.h"
> +#include "linux/kvm.h"
> +
> +int stats_test(int stats_fd, int size_stat)
> +{
> +       ssize_t ret;
> +       int i;
> +       size_t size_desc, size_data = 0;
> +       struct kvm_stats_header header;
> +       struct kvm_stats_desc *stats_desc, *pdesc;
> +       void *stats_data;
> +
> +       /* Read kvm stats header */
> +       ret = read(stats_fd, &header, sizeof(header));
> +       TEST_ASSERT(ret == sizeof(header), "Read stats header");
> +       size_desc = sizeof(*stats_desc) + header.name_size;
> +
> +       /* Check id string in header, that should start with "kvm" */
> +       TEST_ASSERT(!strncmp(header.id, "kvm", 3) &&
> +                       strlen(header.id) < KVM_STATS_ID_MAXLEN,
> +                       "Invalid KVM stats type");
> +
> +       /* Sanity check for other fields in header */
> +       if (header.count == 0)
> +               return 0;
> +       /* Check overlap */
> +       TEST_ASSERT(header.desc_offset > 0 && header.data_offset > 0
> +                       && header.desc_offset >= sizeof(header)
> +                       && header.data_offset >= sizeof(header),
> +                       "Invalid offset fields in header");
> +       TEST_ASSERT(header.desc_offset > header.data_offset
> +                       || (header.desc_offset + size_desc * header.count <=
> +                               header.data_offset),
> +                       "Descriptor block is overlapped with data block");
> +
> +       /* Allocate memory for stats descriptors */
> +       stats_desc = calloc(header.count, size_desc);
> +       TEST_ASSERT(stats_desc, "Allocate memory for stats descriptors");
> +       /* Read kvm stats descriptors */
> +       ret = pread(stats_fd, stats_desc,
> +                       size_desc * header.count, header.desc_offset);
> +       TEST_ASSERT(ret == size_desc * header.count,
> +                       "Read KVM stats descriptors");
> +
> +       /* Sanity check for fields in descriptors */
> +       for (i = 0; i < header.count; ++i) {
> +               pdesc = (void *)stats_desc + i * size_desc;
> +               /* Check type,unit,base boundaries */
> +               TEST_ASSERT((pdesc->flags & KVM_STATS_TYPE_MASK)
> +                               <= KVM_STATS_TYPE_MAX, "Unknown KVM stats type");
> +               TEST_ASSERT((pdesc->flags & KVM_STATS_UNIT_MASK)
> +                               <= KVM_STATS_UNIT_MAX, "Unknown KVM stats unit");
> +               TEST_ASSERT((pdesc->flags & KVM_STATS_BASE_MASK)
> +                               <= KVM_STATS_BASE_MAX, "Unknown KVM stats base");
> +               /* Check exponent for stats unit
> +                * Exponent for counter should be greater than or equal to 0
> +                * Exponent for unit bytes should be greater than or equal to 0
> +                * Exponent for unit seconds should be less than or equal to 0
> +                * Exponent for unit clock cycles should be greater than or
> +                * equal to 0
> +                */
> +               switch (pdesc->flags & KVM_STATS_UNIT_MASK) {
> +               case KVM_STATS_UNIT_NONE:
> +               case KVM_STATS_UNIT_BYTES:
> +               case KVM_STATS_UNIT_CYCLES:
> +                       TEST_ASSERT(pdesc->exponent >= 0,
> +                                       "Unsupported KVM stats unit");
> +                       break;
> +               case KVM_STATS_UNIT_SECONDS:
> +                       TEST_ASSERT(pdesc->exponent <= 0,
> +                                       "Unsupported KVM stats unit");
> +                       break;
> +               }
> +               /* Check name string */
> +               TEST_ASSERT(strlen(pdesc->name) < header.name_size,
> +                               "KVM stats name(%s) too long", pdesc->name);
> +               /* Check size field, which should not be zero */
> +               TEST_ASSERT(pdesc->size, "KVM descriptor(%s) with size of 0",
> +                               pdesc->name);
> +               size_data += pdesc->size * size_stat;
> +       }
> +       /* Check overlap */
> +       TEST_ASSERT(header.data_offset >= header.desc_offset
> +                       || header.data_offset + size_data <= header.desc_offset,
> +                       "Data block is overlapped with Descriptor block");
> +       /* Check validity of all stats data size */
> +       TEST_ASSERT(size_data >= header.count * size_stat,
> +                       "Data size is not correct");
> +
> +       /* Allocate memory for stats data */
> +       stats_data = malloc(size_data);
> +       TEST_ASSERT(stats_data, "Allocate memory for stats data");
> +       /* Read kvm stats data as a bulk */
> +       ret = pread(stats_fd, stats_data, size_data, header.data_offset);
> +       TEST_ASSERT(ret == size_data, "Read KVM stats data");
> +       /* Read kvm stats data one by one */
> +       size_data = 0;
> +       for (i = 0; i < header.count; ++i) {
> +               pdesc = (void *)stats_desc + i * size_desc;
> +               ret = pread(stats_fd, stats_data, pdesc->size * size_stat,
> +                               header.data_offset + size_data);
> +               TEST_ASSERT(ret == pdesc->size * size_stat,
> +                               "Read data of KVM stats: %s", pdesc->name);
> +               size_data += pdesc->size * size_stat;
> +       }
> +
> +       free(stats_data);
> +       free(stats_desc);
> +       return 0;
> +}
> +
> +
> +int vm_stats_test(struct kvm_vm *vm)
> +{
> +       int stats_fd;
> +       struct kvm_vm_stats_data *stats_data;
> +
> +       /* Get fd for VM stats */
> +       stats_fd = vm_get_statsfd(vm);
> +       TEST_ASSERT(stats_fd >= 0, "Get VM stats fd");
> +
> +       stats_test(stats_fd, sizeof(stats_data->value[0]));
> +       close(stats_fd);
> +
> +       return 0;
> +}
> +
> +int vcpu_stats_test(struct kvm_vm *vm, int vcpu_id)
> +{
> +       int stats_fd;
> +       struct kvm_vcpu_stats_data *stats_data;
> +
> +       /* Get fd for VCPU stats */
> +       stats_fd = vcpu_get_statsfd(vm, vcpu_id);
> +       TEST_ASSERT(stats_fd >= 0, "Get VCPU stats fd");
> +
> +       stats_test(stats_fd, sizeof(stats_data->value[0]));
> +       close(stats_fd);
> +
> +       return 0;
> +}
> +
> +#define DEFAULT_NUM_VM         4
> +#define DEFAULT_NUM_VCPU       4
> +
> +/*
> + * Usage: kvm_bin_form_stats [#vm] [#vcpu]
> + * The first parameter #vm set the number of VMs being created.
> + * The second parameter #vcpu set the number of VCPUs being created.
> + * By default, DEFAULT_NUM_VM VM and DEFAULT_NUM_VCPU VCPU for the VM would be
> + * created for testing.
> + */
> +
> +int main(int argc, char *argv[])
> +{
> +       int max_vm = DEFAULT_NUM_VM, max_vcpu = DEFAULT_NUM_VCPU, ret, i, j;
> +       struct kvm_vm **vms;
> +
> +       /* Get the number of VMs and VCPUs that would be created for testing. */
> +       if (argc > 1) {
> +               max_vm = strtol(argv[1], NULL, 0);
> +               if (max_vm <= 0)
> +                       max_vm = DEFAULT_NUM_VM;
> +       }
> +       if (argc > 2) {
> +               max_vcpu = strtol(argv[2], NULL, 0);
> +               if (max_vcpu <= 0)
> +                       max_vcpu = DEFAULT_NUM_VCPU;
> +       }
> +
> +       /* Check the extension for binary stats */
> +       ret = kvm_check_cap(KVM_CAP_STATS_BINARY_FD);
> +       TEST_ASSERT(ret >= 0,
> +                       "Binary form statistics interface is not supported");
> +
> +       /* Create VMs and VCPUs */
> +       vms = malloc(sizeof(vms[0]) * max_vm);
> +       TEST_ASSERT(vms, "Allocate memory for storing VM pointers");
> +       for (i = 0; i < max_vm; ++i) {
> +               vms[i] = vm_create(VM_MODE_DEFAULT,
> +                               DEFAULT_GUEST_PHY_PAGES, O_RDWR);
> +               for (j = 0; j < max_vcpu; ++j)
> +                       vm_vcpu_add(vms[i], j);
> +       }
> +
> +       /* Check stats read for every VM and VCPU */
> +       for (i = 0; i < max_vm; ++i) {
> +               vm_stats_test(vms[i]);
> +               for (j = 0; j < max_vcpu; ++j)
> +                       vcpu_stats_test(vms[i], j);
> +       }
> +
> +       for (i = 0; i < max_vm; ++i)
> +               kvm_vm_free(vms[i]);
> +       free(vms);
> +       return 0;
> +}
> diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
> index fc83f6c5902d..d9e0b2c8b906 100644
> --- a/tools/testing/selftests/kvm/lib/kvm_util.c
> +++ b/tools/testing/selftests/kvm/lib/kvm_util.c
> @@ -2090,3 +2090,15 @@ unsigned int vm_calc_num_guest_pages(enum vm_guest_mode mode, size_t size)
>         n = DIV_ROUND_UP(size, vm_guest_mode_params[mode].page_size);
>         return vm_adjust_num_guest_pages(mode, n);
>  }
> +
> +int vm_get_statsfd(struct kvm_vm *vm)
> +{
> +       return ioctl(vm->fd, KVM_STATS_GETFD, NULL);
> +}
> +
> +int vcpu_get_statsfd(struct kvm_vm *vm, uint32_t vcpuid)
> +{
> +       struct vcpu *vcpu = vcpu_find(vm, vcpuid);
> +
> +       return ioctl(vcpu->fd, KVM_STATS_GETFD, NULL);
> +}
> --
> 2.31.1.818.g46aad6cb9e-goog
>
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Re: [PATCH v6 4/4] KVM: selftests: Add selftest for KVM statistics data binary interface

[Krish Sadhukhan]

On 5/24/21 8:18 AM, Jing Zhang wrote:
> Add selftest to check KVM stats descriptors validity.
>
> Reviewed-by: David Matlack <dmatlack@google.com>
> Reviewed-by: Ricardo Koller <ricarkol@google.com>
> Signed-off-by: Jing Zhang <jingzhangos@google.com>
> ---
>   tools/testing/selftests/kvm/.gitignore        |   1 +
>   tools/testing/selftests/kvm/Makefile          |   3 +
>   .../testing/selftests/kvm/include/kvm_util.h  |   3 +
>   .../selftests/kvm/kvm_bin_form_stats.c        | 216 ++++++++++++++++++
>   tools/testing/selftests/kvm/lib/kvm_util.c    |  12 +
>   5 files changed, 235 insertions(+)
>   create mode 100644 tools/testing/selftests/kvm/kvm_bin_form_stats.c


We should probably follow the naming convention for the majority of the 
files in the kvm directory and name it kvm_stats_read_test.c or 
kvm_stats_test.c or something like that.

>
> diff --git a/tools/testing/selftests/kvm/.gitignore b/tools/testing/selftests/kvm/.gitignore
> index bd83158e0e0b..35796667c944 100644
> --- a/tools/testing/selftests/kvm/.gitignore
> +++ b/tools/testing/selftests/kvm/.gitignore
> @@ -43,3 +43,4 @@
>   /memslot_modification_stress_test
>   /set_memory_region_test
>   /steal_time
> +/kvm_bin_form_stats
> diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
> index e439d027939d..2984c86c848a 100644
> --- a/tools/testing/selftests/kvm/Makefile
> +++ b/tools/testing/selftests/kvm/Makefile
> @@ -76,6 +76,7 @@ TEST_GEN_PROGS_x86_64 += kvm_page_table_test
>   TEST_GEN_PROGS_x86_64 += memslot_modification_stress_test
>   TEST_GEN_PROGS_x86_64 += set_memory_region_test
>   TEST_GEN_PROGS_x86_64 += steal_time
> +TEST_GEN_PROGS_x86_64 += kvm_bin_form_stats
>   
>   TEST_GEN_PROGS_aarch64 += aarch64/get-reg-list
>   TEST_GEN_PROGS_aarch64 += aarch64/get-reg-list-sve
> @@ -87,6 +88,7 @@ TEST_GEN_PROGS_aarch64 += kvm_create_max_vcpus
>   TEST_GEN_PROGS_aarch64 += kvm_page_table_test
>   TEST_GEN_PROGS_aarch64 += set_memory_region_test
>   TEST_GEN_PROGS_aarch64 += steal_time
> +TEST_GEN_PROGS_aarch64 += kvm_bin_form_stats
>   
>   TEST_GEN_PROGS_s390x = s390x/memop
>   TEST_GEN_PROGS_s390x += s390x/resets
> @@ -96,6 +98,7 @@ TEST_GEN_PROGS_s390x += dirty_log_test
>   TEST_GEN_PROGS_s390x += kvm_create_max_vcpus
>   TEST_GEN_PROGS_s390x += kvm_page_table_test
>   TEST_GEN_PROGS_s390x += set_memory_region_test
> +TEST_GEN_PROGS_s390x += kvm_bin_form_stats
>   
>   TEST_GEN_PROGS += $(TEST_GEN_PROGS_$(UNAME_M))
>   LIBKVM += $(LIBKVM_$(UNAME_M))
> diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h
> index a8f022794ce3..ee01a67022d9 100644
> --- a/tools/testing/selftests/kvm/include/kvm_util.h
> +++ b/tools/testing/selftests/kvm/include/kvm_util.h
> @@ -387,4 +387,7 @@ uint64_t get_ucall(struct kvm_vm *vm, uint32_t vcpu_id, struct ucall *uc);
>   #define GUEST_ASSERT_4(_condition, arg1, arg2, arg3, arg4) \
>   	__GUEST_ASSERT((_condition), 4, (arg1), (arg2), (arg3), (arg4))
>   
> +int vm_get_statsfd(struct kvm_vm *vm);
> +int vcpu_get_statsfd(struct kvm_vm *vm, uint32_t vcpuid);
> +
>   #endif /* SELFTEST_KVM_UTIL_H */
> diff --git a/tools/testing/selftests/kvm/kvm_bin_form_stats.c b/tools/testing/selftests/kvm/kvm_bin_form_stats.c
> new file mode 100644
> index 000000000000..09e12c5838af
> --- /dev/null
> +++ b/tools/testing/selftests/kvm/kvm_bin_form_stats.c
> @@ -0,0 +1,216 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * kvm_bin_form_stats
> + *
> + * Copyright (C) 2021, Google LLC.
> + *
> + * Test the fd-based interface for KVM statistics.
> + */
> +
> +#define _GNU_SOURCE /* for program_invocation_short_name */
> +#include <fcntl.h>
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <string.h>
> +#include <errno.h>
> +
> +#include "test_util.h"
> +
> +#include "kvm_util.h"
> +#include "asm/kvm.h"
> +#include "linux/kvm.h"
> +
> +int stats_test(int stats_fd, int size_stat)


The return value is not used by the caller. Perhaps make it a void ?

> +{
> +	ssize_t ret;
> +	int i;
> +	size_t size_desc, size_data = 0;
> +	struct kvm_stats_header header;
> +	struct kvm_stats_desc *stats_desc, *pdesc;
> +	void *stats_data;
> +
> +	/* Read kvm stats header */
> +	ret = read(stats_fd, &header, sizeof(header));
> +	TEST_ASSERT(ret == sizeof(header), "Read stats header");
> +	size_desc = sizeof(*stats_desc) + header.name_size;
> +
> +	/* Check id string in header, that should start with "kvm" */
> +	TEST_ASSERT(!strncmp(header.id, "kvm", 3) &&
> +			strlen(header.id) < KVM_STATS_ID_MAXLEN,
> +			"Invalid KVM stats type");
> +
> +	/* Sanity check for other fields in header */
> +	if (header.count == 0)


Does this need a message as to why count is zero ?

> +		return 0;
> +	/* Check overlap */
> +	TEST_ASSERT(header.desc_offset > 0 && header.data_offset > 0
> +			&& header.desc_offset >= sizeof(header)
> +			&& header.data_offset >= sizeof(header),
> +			"Invalid offset fields in header");
> +	TEST_ASSERT(header.desc_offset > header.data_offset
> +			|| (header.desc_offset + size_desc * header.count <=
> +				header.data_offset),
> +			"Descriptor block is overlapped with data block");
> +
> +	/* Allocate memory for stats descriptors */
> +	stats_desc = calloc(header.count, size_desc);
> +	TEST_ASSERT(stats_desc, "Allocate memory for stats descriptors");
> +	/* Read kvm stats descriptors */
> +	ret = pread(stats_fd, stats_desc,
> +			size_desc * header.count, header.desc_offset);
> +	TEST_ASSERT(ret == size_desc * header.count,
> +			"Read KVM stats descriptors");
> +
> +	/* Sanity check for fields in descriptors */
> +	for (i = 0; i < header.count; ++i) {
> +		pdesc = (void *)stats_desc + i * size_desc;
> +		/* Check type,unit,base boundaries */
> +		TEST_ASSERT((pdesc->flags & KVM_STATS_TYPE_MASK)
> +				<= KVM_STATS_TYPE_MAX, "Unknown KVM stats type");
> +		TEST_ASSERT((pdesc->flags & KVM_STATS_UNIT_MASK)
> +				<= KVM_STATS_UNIT_MAX, "Unknown KVM stats unit");
> +		TEST_ASSERT((pdesc->flags & KVM_STATS_BASE_MASK)
> +				<= KVM_STATS_BASE_MAX, "Unknown KVM stats base");
> +		/* Check exponent for stats unit
> +		 * Exponent for counter should be greater than or equal to 0
> +		 * Exponent for unit bytes should be greater than or equal to 0
> +		 * Exponent for unit seconds should be less than or equal to 0
> +		 * Exponent for unit clock cycles should be greater than or
> +		 * equal to 0
> +		 */
> +		switch (pdesc->flags & KVM_STATS_UNIT_MASK) {
> +		case KVM_STATS_UNIT_NONE:
> +		case KVM_STATS_UNIT_BYTES:
> +		case KVM_STATS_UNIT_CYCLES:
> +			TEST_ASSERT(pdesc->exponent >= 0,
> +					"Unsupported KVM stats unit");
> +			break;
> +		case KVM_STATS_UNIT_SECONDS:
> +			TEST_ASSERT(pdesc->exponent <= 0,
> +					"Unsupported KVM stats unit");
> +			break;
> +		}
> +		/* Check name string */
> +		TEST_ASSERT(strlen(pdesc->name) < header.name_size,
> +				"KVM stats name(%s) too long", pdesc->name);
> +		/* Check size field, which should not be zero */
> +		TEST_ASSERT(pdesc->size, "KVM descriptor(%s) with size of 0",
> +				pdesc->name);
> +		size_data += pdesc->size * size_stat;
> +	}
> +	/* Check overlap */
> +	TEST_ASSERT(header.data_offset >= header.desc_offset
> +			|| header.data_offset + size_data <= header.desc_offset,
> +			"Data block is overlapped with Descriptor block");
> +	/* Check validity of all stats data size */
> +	TEST_ASSERT(size_data >= header.count * size_stat,
> +			"Data size is not correct");
> +
> +	/* Allocate memory for stats data */
> +	stats_data = malloc(size_data);
> +	TEST_ASSERT(stats_data, "Allocate memory for stats data");
> +	/* Read kvm stats data as a bulk */
> +	ret = pread(stats_fd, stats_data, size_data, header.data_offset);
> +	TEST_ASSERT(ret == size_data, "Read KVM stats data");
> +	/* Read kvm stats data one by one */
> +	size_data = 0;
> +	for (i = 0; i < header.count; ++i) {
> +		pdesc = (void *)stats_desc + i * size_desc;
> +		ret = pread(stats_fd, stats_data, pdesc->size * size_stat,
> +				header.data_offset + size_data);
> +		TEST_ASSERT(ret == pdesc->size * size_stat,
> +				"Read data of KVM stats: %s", pdesc->name);
> +		size_data += pdesc->size * size_stat;
> +	}
> +
> +	free(stats_data);
> +	free(stats_desc);
> +	return 0;
> +}
> +
> +
> +int vm_stats_test(struct kvm_vm *vm)
> +{
> +	int stats_fd;
> +	struct kvm_vm_stats_data *stats_data;
> +
> +	/* Get fd for VM stats */
> +	stats_fd = vm_get_statsfd(vm);
> +	TEST_ASSERT(stats_fd >= 0, "Get VM stats fd");
> +
> +	stats_test(stats_fd, sizeof(stats_data->value[0]));
> +	close(stats_fd);
> +
> +	return 0;
> +}
> +
> +int vcpu_stats_test(struct kvm_vm *vm, int vcpu_id)
> +{
> +	int stats_fd;
> +	struct kvm_vcpu_stats_data *stats_data;
> +
> +	/* Get fd for VCPU stats */
> +	stats_fd = vcpu_get_statsfd(vm, vcpu_id);
> +	TEST_ASSERT(stats_fd >= 0, "Get VCPU stats fd");
> +
> +	stats_test(stats_fd, sizeof(stats_data->value[0]));
> +	close(stats_fd);
> +
> +	return 0;
> +}
> +
> +#define DEFAULT_NUM_VM		4
> +#define DEFAULT_NUM_VCPU	4
> +
> +/*
> + * Usage: kvm_bin_form_stats [#vm] [#vcpu]
> + * The first parameter #vm set the number of VMs being created.
> + * The second parameter #vcpu set the number of VCPUs being created.
> + * By default, DEFAULT_NUM_VM VM and DEFAULT_NUM_VCPU VCPU for the VM would be
> + * created for testing.
> + */
> +
> +int main(int argc, char *argv[])
> +{
> +	int max_vm = DEFAULT_NUM_VM, max_vcpu = DEFAULT_NUM_VCPU, ret, i, j;
> +	struct kvm_vm **vms;
> +
> +	/* Get the number of VMs and VCPUs that would be created for testing. */
> +	if (argc > 1) {
> +		max_vm = strtol(argv[1], NULL, 0);
> +		if (max_vm <= 0)
> +			max_vm = DEFAULT_NUM_VM;
> +	}
> +	if (argc > 2) {
> +		max_vcpu = strtol(argv[2], NULL, 0);
> +		if (max_vcpu <= 0)
> +			max_vcpu = DEFAULT_NUM_VCPU;
> +	}
> +
> +	/* Check the extension for binary stats */
> +	ret = kvm_check_cap(KVM_CAP_STATS_BINARY_FD);
> +	TEST_ASSERT(ret >= 0,
> +			"Binary form statistics interface is not supported");
> +
> +	/* Create VMs and VCPUs */
> +	vms = malloc(sizeof(vms[0]) * max_vm);
> +	TEST_ASSERT(vms, "Allocate memory for storing VM pointers");
> +	for (i = 0; i < max_vm; ++i) {
> +		vms[i] = vm_create(VM_MODE_DEFAULT,
> +				DEFAULT_GUEST_PHY_PAGES, O_RDWR);
> +		for (j = 0; j < max_vcpu; ++j)
> +			vm_vcpu_add(vms[i], j);
> +	}
> +
> +	/* Check stats read for every VM and VCPU */
> +	for (i = 0; i < max_vm; ++i) {
> +		vm_stats_test(vms[i]);
> +		for (j = 0; j < max_vcpu; ++j)
> +			vcpu_stats_test(vms[i], j);
> +	}
> +


Does it make sense to add one more test case here to test this fd 
interface on a VM or on a VCPU that has been deleted ? For example, how 
does this fd interface behave if we delete the 4th VM and the 4th VCPU 
in the 3rd VM ?

> +	for (i = 0; i < max_vm; ++i)
> +		kvm_vm_free(vms[i]);
> +	free(vms);
> +	return 0;
> +}
> diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
> index fc83f6c5902d..d9e0b2c8b906 100644
> --- a/tools/testing/selftests/kvm/lib/kvm_util.c
> +++ b/tools/testing/selftests/kvm/lib/kvm_util.c
> @@ -2090,3 +2090,15 @@ unsigned int vm_calc_num_guest_pages(enum vm_guest_mode mode, size_t size)
>   	n = DIV_ROUND_UP(size, vm_guest_mode_params[mode].page_size);
>   	return vm_adjust_num_guest_pages(mode, n);
>   }
> +
> +int vm_get_statsfd(struct kvm_vm *vm)
> +{
> +	return ioctl(vm->fd, KVM_STATS_GETFD, NULL);
> +}
> +
> +int vcpu_get_statsfd(struct kvm_vm *vm, uint32_t vcpuid)
> +{
> +	struct vcpu *vcpu = vcpu_find(vm, vcpuid);
> +
> +	return ioctl(vcpu->fd, KVM_STATS_GETFD, NULL);
> +}


Do we need separate functions if they are called just once ?  Or perhaps 
have a single function for the ioctl call, like ?

      int get_stats_fd(int fd, int type)

      {

             return ioctl(fd, type, NULL);

      }

Re: [PATCH v6 4/4] KVM: selftests: Add selftest for KVM statistics data binary interface

[Krish Sadhukhan]

On 5/24/21 8:18 AM, Jing Zhang wrote:
> Add selftest to check KVM stats descriptors validity.
>
> Reviewed-by: David Matlack <dmatlack@google.com>
> Reviewed-by: Ricardo Koller <ricarkol@google.com>
> Signed-off-by: Jing Zhang <jingzhangos@google.com>
> ---
>   tools/testing/selftests/kvm/.gitignore        |   1 +
>   tools/testing/selftests/kvm/Makefile          |   3 +
>   .../testing/selftests/kvm/include/kvm_util.h  |   3 +
>   .../selftests/kvm/kvm_bin_form_stats.c        | 216 ++++++++++++++++++
>   tools/testing/selftests/kvm/lib/kvm_util.c    |  12 +
>   5 files changed, 235 insertions(+)
>   create mode 100644 tools/testing/selftests/kvm/kvm_bin_form_stats.c


We should probably follow the naming convention for the majority of the 
files in the kvm directory and name it kvm_stats_read_test.c or 
kvm_stats_test.c or something like that.

>
> diff --git a/tools/testing/selftests/kvm/.gitignore b/tools/testing/selftests/kvm/.gitignore
> index bd83158e0e0b..35796667c944 100644
> --- a/tools/testing/selftests/kvm/.gitignore
> +++ b/tools/testing/selftests/kvm/.gitignore
> @@ -43,3 +43,4 @@
>   /memslot_modification_stress_test
>   /set_memory_region_test
>   /steal_time
> +/kvm_bin_form_stats
> diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
> index e439d027939d..2984c86c848a 100644
> --- a/tools/testing/selftests/kvm/Makefile
> +++ b/tools/testing/selftests/kvm/Makefile
> @@ -76,6 +76,7 @@ TEST_GEN_PROGS_x86_64 += kvm_page_table_test
>   TEST_GEN_PROGS_x86_64 += memslot_modification_stress_test
>   TEST_GEN_PROGS_x86_64 += set_memory_region_test
>   TEST_GEN_PROGS_x86_64 += steal_time
> +TEST_GEN_PROGS_x86_64 += kvm_bin_form_stats
>   
>   TEST_GEN_PROGS_aarch64 += aarch64/get-reg-list
>   TEST_GEN_PROGS_aarch64 += aarch64/get-reg-list-sve
> @@ -87,6 +88,7 @@ TEST_GEN_PROGS_aarch64 += kvm_create_max_vcpus
>   TEST_GEN_PROGS_aarch64 += kvm_page_table_test
>   TEST_GEN_PROGS_aarch64 += set_memory_region_test
>   TEST_GEN_PROGS_aarch64 += steal_time
> +TEST_GEN_PROGS_aarch64 += kvm_bin_form_stats
>   
>   TEST_GEN_PROGS_s390x = s390x/memop
>   TEST_GEN_PROGS_s390x += s390x/resets
> @@ -96,6 +98,7 @@ TEST_GEN_PROGS_s390x += dirty_log_test
>   TEST_GEN_PROGS_s390x += kvm_create_max_vcpus
>   TEST_GEN_PROGS_s390x += kvm_page_table_test
>   TEST_GEN_PROGS_s390x += set_memory_region_test
> +TEST_GEN_PROGS_s390x += kvm_bin_form_stats
>   
>   TEST_GEN_PROGS += $(TEST_GEN_PROGS_$(UNAME_M))
>   LIBKVM += $(LIBKVM_$(UNAME_M))
> diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h
> index a8f022794ce3..ee01a67022d9 100644
> --- a/tools/testing/selftests/kvm/include/kvm_util.h
> +++ b/tools/testing/selftests/kvm/include/kvm_util.h
> @@ -387,4 +387,7 @@ uint64_t get_ucall(struct kvm_vm *vm, uint32_t vcpu_id, struct ucall *uc);
>   #define GUEST_ASSERT_4(_condition, arg1, arg2, arg3, arg4) \
>   	__GUEST_ASSERT((_condition), 4, (arg1), (arg2), (arg3), (arg4))
>   
> +int vm_get_statsfd(struct kvm_vm *vm);
> +int vcpu_get_statsfd(struct kvm_vm *vm, uint32_t vcpuid);
> +
>   #endif /* SELFTEST_KVM_UTIL_H */
> diff --git a/tools/testing/selftests/kvm/kvm_bin_form_stats.c b/tools/testing/selftests/kvm/kvm_bin_form_stats.c
> new file mode 100644
> index 000000000000..09e12c5838af
> --- /dev/null
> +++ b/tools/testing/selftests/kvm/kvm_bin_form_stats.c
> @@ -0,0 +1,216 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * kvm_bin_form_stats
> + *
> + * Copyright (C) 2021, Google LLC.
> + *
> + * Test the fd-based interface for KVM statistics.
> + */
> +
> +#define _GNU_SOURCE /* for program_invocation_short_name */
> +#include <fcntl.h>
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <string.h>
> +#include <errno.h>
> +
> +#include "test_util.h"
> +
> +#include "kvm_util.h"
> +#include "asm/kvm.h"
> +#include "linux/kvm.h"
> +
> +int stats_test(int stats_fd, int size_stat)


The return value is not used by the caller. Perhaps make it a void ?

> +{
> +	ssize_t ret;
> +	int i;
> +	size_t size_desc, size_data = 0;
> +	struct kvm_stats_header header;
> +	struct kvm_stats_desc *stats_desc, *pdesc;
> +	void *stats_data;
> +
> +	/* Read kvm stats header */
> +	ret = read(stats_fd, &header, sizeof(header));
> +	TEST_ASSERT(ret = sizeof(header), "Read stats header");
> +	size_desc = sizeof(*stats_desc) + header.name_size;
> +
> +	/* Check id string in header, that should start with "kvm" */
> +	TEST_ASSERT(!strncmp(header.id, "kvm", 3) &&
> +			strlen(header.id) < KVM_STATS_ID_MAXLEN,
> +			"Invalid KVM stats type");
> +
> +	/* Sanity check for other fields in header */
> +	if (header.count = 0)


Does this need a message as to why count is zero ?

> +		return 0;
> +	/* Check overlap */
> +	TEST_ASSERT(header.desc_offset > 0 && header.data_offset > 0
> +			&& header.desc_offset >= sizeof(header)
> +			&& header.data_offset >= sizeof(header),
> +			"Invalid offset fields in header");
> +	TEST_ASSERT(header.desc_offset > header.data_offset
> +			|| (header.desc_offset + size_desc * header.count <> +				header.data_offset),
> +			"Descriptor block is overlapped with data block");
> +
> +	/* Allocate memory for stats descriptors */
> +	stats_desc = calloc(header.count, size_desc);
> +	TEST_ASSERT(stats_desc, "Allocate memory for stats descriptors");
> +	/* Read kvm stats descriptors */
> +	ret = pread(stats_fd, stats_desc,
> +			size_desc * header.count, header.desc_offset);
> +	TEST_ASSERT(ret = size_desc * header.count,
> +			"Read KVM stats descriptors");
> +
> +	/* Sanity check for fields in descriptors */
> +	for (i = 0; i < header.count; ++i) {
> +		pdesc = (void *)stats_desc + i * size_desc;
> +		/* Check type,unit,base boundaries */
> +		TEST_ASSERT((pdesc->flags & KVM_STATS_TYPE_MASK)
> +				<= KVM_STATS_TYPE_MAX, "Unknown KVM stats type");
> +		TEST_ASSERT((pdesc->flags & KVM_STATS_UNIT_MASK)
> +				<= KVM_STATS_UNIT_MAX, "Unknown KVM stats unit");
> +		TEST_ASSERT((pdesc->flags & KVM_STATS_BASE_MASK)
> +				<= KVM_STATS_BASE_MAX, "Unknown KVM stats base");
> +		/* Check exponent for stats unit
> +		 * Exponent for counter should be greater than or equal to 0
> +		 * Exponent for unit bytes should be greater than or equal to 0
> +		 * Exponent for unit seconds should be less than or equal to 0
> +		 * Exponent for unit clock cycles should be greater than or
> +		 * equal to 0
> +		 */
> +		switch (pdesc->flags & KVM_STATS_UNIT_MASK) {
> +		case KVM_STATS_UNIT_NONE:
> +		case KVM_STATS_UNIT_BYTES:
> +		case KVM_STATS_UNIT_CYCLES:
> +			TEST_ASSERT(pdesc->exponent >= 0,
> +					"Unsupported KVM stats unit");
> +			break;
> +		case KVM_STATS_UNIT_SECONDS:
> +			TEST_ASSERT(pdesc->exponent <= 0,
> +					"Unsupported KVM stats unit");
> +			break;
> +		}
> +		/* Check name string */
> +		TEST_ASSERT(strlen(pdesc->name) < header.name_size,
> +				"KVM stats name(%s) too long", pdesc->name);
> +		/* Check size field, which should not be zero */
> +		TEST_ASSERT(pdesc->size, "KVM descriptor(%s) with size of 0",
> +				pdesc->name);
> +		size_data += pdesc->size * size_stat;
> +	}
> +	/* Check overlap */
> +	TEST_ASSERT(header.data_offset >= header.desc_offset
> +			|| header.data_offset + size_data <= header.desc_offset,
> +			"Data block is overlapped with Descriptor block");
> +	/* Check validity of all stats data size */
> +	TEST_ASSERT(size_data >= header.count * size_stat,
> +			"Data size is not correct");
> +
> +	/* Allocate memory for stats data */
> +	stats_data = malloc(size_data);
> +	TEST_ASSERT(stats_data, "Allocate memory for stats data");
> +	/* Read kvm stats data as a bulk */
> +	ret = pread(stats_fd, stats_data, size_data, header.data_offset);
> +	TEST_ASSERT(ret = size_data, "Read KVM stats data");
> +	/* Read kvm stats data one by one */
> +	size_data = 0;
> +	for (i = 0; i < header.count; ++i) {
> +		pdesc = (void *)stats_desc + i * size_desc;
> +		ret = pread(stats_fd, stats_data, pdesc->size * size_stat,
> +				header.data_offset + size_data);
> +		TEST_ASSERT(ret = pdesc->size * size_stat,
> +				"Read data of KVM stats: %s", pdesc->name);
> +		size_data += pdesc->size * size_stat;
> +	}
> +
> +	free(stats_data);
> +	free(stats_desc);
> +	return 0;
> +}
> +
> +
> +int vm_stats_test(struct kvm_vm *vm)
> +{
> +	int stats_fd;
> +	struct kvm_vm_stats_data *stats_data;
> +
> +	/* Get fd for VM stats */
> +	stats_fd = vm_get_statsfd(vm);
> +	TEST_ASSERT(stats_fd >= 0, "Get VM stats fd");
> +
> +	stats_test(stats_fd, sizeof(stats_data->value[0]));
> +	close(stats_fd);
> +
> +	return 0;
> +}
> +
> +int vcpu_stats_test(struct kvm_vm *vm, int vcpu_id)
> +{
> +	int stats_fd;
> +	struct kvm_vcpu_stats_data *stats_data;
> +
> +	/* Get fd for VCPU stats */
> +	stats_fd = vcpu_get_statsfd(vm, vcpu_id);
> +	TEST_ASSERT(stats_fd >= 0, "Get VCPU stats fd");
> +
> +	stats_test(stats_fd, sizeof(stats_data->value[0]));
> +	close(stats_fd);
> +
> +	return 0;
> +}
> +
> +#define DEFAULT_NUM_VM		4
> +#define DEFAULT_NUM_VCPU	4
> +
> +/*
> + * Usage: kvm_bin_form_stats [#vm] [#vcpu]
> + * The first parameter #vm set the number of VMs being created.
> + * The second parameter #vcpu set the number of VCPUs being created.
> + * By default, DEFAULT_NUM_VM VM and DEFAULT_NUM_VCPU VCPU for the VM would be
> + * created for testing.
> + */
> +
> +int main(int argc, char *argv[])
> +{
> +	int max_vm = DEFAULT_NUM_VM, max_vcpu = DEFAULT_NUM_VCPU, ret, i, j;
> +	struct kvm_vm **vms;
> +
> +	/* Get the number of VMs and VCPUs that would be created for testing. */
> +	if (argc > 1) {
> +		max_vm = strtol(argv[1], NULL, 0);
> +		if (max_vm <= 0)
> +			max_vm = DEFAULT_NUM_VM;
> +	}
> +	if (argc > 2) {
> +		max_vcpu = strtol(argv[2], NULL, 0);
> +		if (max_vcpu <= 0)
> +			max_vcpu = DEFAULT_NUM_VCPU;
> +	}
> +
> +	/* Check the extension for binary stats */
> +	ret = kvm_check_cap(KVM_CAP_STATS_BINARY_FD);
> +	TEST_ASSERT(ret >= 0,
> +			"Binary form statistics interface is not supported");
> +
> +	/* Create VMs and VCPUs */
> +	vms = malloc(sizeof(vms[0]) * max_vm);
> +	TEST_ASSERT(vms, "Allocate memory for storing VM pointers");
> +	for (i = 0; i < max_vm; ++i) {
> +		vms[i] = vm_create(VM_MODE_DEFAULT,
> +				DEFAULT_GUEST_PHY_PAGES, O_RDWR);
> +		for (j = 0; j < max_vcpu; ++j)
> +			vm_vcpu_add(vms[i], j);
> +	}
> +
> +	/* Check stats read for every VM and VCPU */
> +	for (i = 0; i < max_vm; ++i) {
> +		vm_stats_test(vms[i]);
> +		for (j = 0; j < max_vcpu; ++j)
> +			vcpu_stats_test(vms[i], j);
> +	}
> +


Does it make sense to add one more test case here to test this fd 
interface on a VM or on a VCPU that has been deleted ? For example, how 
does this fd interface behave if we delete the 4th VM and the 4th VCPU 
in the 3rd VM ?

> +	for (i = 0; i < max_vm; ++i)
> +		kvm_vm_free(vms[i]);
> +	free(vms);
> +	return 0;
> +}
> diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
> index fc83f6c5902d..d9e0b2c8b906 100644
> --- a/tools/testing/selftests/kvm/lib/kvm_util.c
> +++ b/tools/testing/selftests/kvm/lib/kvm_util.c
> @@ -2090,3 +2090,15 @@ unsigned int vm_calc_num_guest_pages(enum vm_guest_mode mode, size_t size)
>   	n = DIV_ROUND_UP(size, vm_guest_mode_params[mode].page_size);
>   	return vm_adjust_num_guest_pages(mode, n);
>   }
> +
> +int vm_get_statsfd(struct kvm_vm *vm)
> +{
> +	return ioctl(vm->fd, KVM_STATS_GETFD, NULL);
> +}
> +
> +int vcpu_get_statsfd(struct kvm_vm *vm, uint32_t vcpuid)
> +{
> +	struct vcpu *vcpu = vcpu_find(vm, vcpuid);
> +
> +	return ioctl(vcpu->fd, KVM_STATS_GETFD, NULL);
> +}


Do we need separate functions if they are called just once ?  Or perhaps 
have a single function for the ioctl call, like ?

      int get_stats_fd(int fd, int type)

      {

             return ioctl(fd, type, NULL);

      }

Re: [PATCH v6 4/4] KVM: selftests: Add selftest for KVM statistics data binary interface

[Krish Sadhukhan]

On 5/24/21 8:18 AM, Jing Zhang wrote:
> Add selftest to check KVM stats descriptors validity.
>
> Reviewed-by: David Matlack <dmatlack@google.com>
> Reviewed-by: Ricardo Koller <ricarkol@google.com>
> Signed-off-by: Jing Zhang <jingzhangos@google.com>
> ---
>   tools/testing/selftests/kvm/.gitignore        |   1 +
>   tools/testing/selftests/kvm/Makefile          |   3 +
>   .../testing/selftests/kvm/include/kvm_util.h  |   3 +
>   .../selftests/kvm/kvm_bin_form_stats.c        | 216 ++++++++++++++++++
>   tools/testing/selftests/kvm/lib/kvm_util.c    |  12 +
>   5 files changed, 235 insertions(+)
>   create mode 100644 tools/testing/selftests/kvm/kvm_bin_form_stats.c


We should probably follow the naming convention for the majority of the 
files in the kvm directory and name it kvm_stats_read_test.c or 
kvm_stats_test.c or something like that.

>
> diff --git a/tools/testing/selftests/kvm/.gitignore b/tools/testing/selftests/kvm/.gitignore
> index bd83158e0e0b..35796667c944 100644
> --- a/tools/testing/selftests/kvm/.gitignore
> +++ b/tools/testing/selftests/kvm/.gitignore
> @@ -43,3 +43,4 @@
>   /memslot_modification_stress_test
>   /set_memory_region_test
>   /steal_time
> +/kvm_bin_form_stats
> diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
> index e439d027939d..2984c86c848a 100644
> --- a/tools/testing/selftests/kvm/Makefile
> +++ b/tools/testing/selftests/kvm/Makefile
> @@ -76,6 +76,7 @@ TEST_GEN_PROGS_x86_64 += kvm_page_table_test
>   TEST_GEN_PROGS_x86_64 += memslot_modification_stress_test
>   TEST_GEN_PROGS_x86_64 += set_memory_region_test
>   TEST_GEN_PROGS_x86_64 += steal_time
> +TEST_GEN_PROGS_x86_64 += kvm_bin_form_stats
>   
>   TEST_GEN_PROGS_aarch64 += aarch64/get-reg-list
>   TEST_GEN_PROGS_aarch64 += aarch64/get-reg-list-sve
> @@ -87,6 +88,7 @@ TEST_GEN_PROGS_aarch64 += kvm_create_max_vcpus
>   TEST_GEN_PROGS_aarch64 += kvm_page_table_test
>   TEST_GEN_PROGS_aarch64 += set_memory_region_test
>   TEST_GEN_PROGS_aarch64 += steal_time
> +TEST_GEN_PROGS_aarch64 += kvm_bin_form_stats
>   
>   TEST_GEN_PROGS_s390x = s390x/memop
>   TEST_GEN_PROGS_s390x += s390x/resets
> @@ -96,6 +98,7 @@ TEST_GEN_PROGS_s390x += dirty_log_test
>   TEST_GEN_PROGS_s390x += kvm_create_max_vcpus
>   TEST_GEN_PROGS_s390x += kvm_page_table_test
>   TEST_GEN_PROGS_s390x += set_memory_region_test
> +TEST_GEN_PROGS_s390x += kvm_bin_form_stats
>   
>   TEST_GEN_PROGS += $(TEST_GEN_PROGS_$(UNAME_M))
>   LIBKVM += $(LIBKVM_$(UNAME_M))
> diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h
> index a8f022794ce3..ee01a67022d9 100644
> --- a/tools/testing/selftests/kvm/include/kvm_util.h
> +++ b/tools/testing/selftests/kvm/include/kvm_util.h
> @@ -387,4 +387,7 @@ uint64_t get_ucall(struct kvm_vm *vm, uint32_t vcpu_id, struct ucall *uc);
>   #define GUEST_ASSERT_4(_condition, arg1, arg2, arg3, arg4) \
>   	__GUEST_ASSERT((_condition), 4, (arg1), (arg2), (arg3), (arg4))
>   
> +int vm_get_statsfd(struct kvm_vm *vm);
> +int vcpu_get_statsfd(struct kvm_vm *vm, uint32_t vcpuid);
> +
>   #endif /* SELFTEST_KVM_UTIL_H */
> diff --git a/tools/testing/selftests/kvm/kvm_bin_form_stats.c b/tools/testing/selftests/kvm/kvm_bin_form_stats.c
> new file mode 100644
> index 000000000000..09e12c5838af
> --- /dev/null
> +++ b/tools/testing/selftests/kvm/kvm_bin_form_stats.c
> @@ -0,0 +1,216 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * kvm_bin_form_stats
> + *
> + * Copyright (C) 2021, Google LLC.
> + *
> + * Test the fd-based interface for KVM statistics.
> + */
> +
> +#define _GNU_SOURCE /* for program_invocation_short_name */
> +#include <fcntl.h>
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <string.h>
> +#include <errno.h>
> +
> +#include "test_util.h"
> +
> +#include "kvm_util.h"
> +#include "asm/kvm.h"
> +#include "linux/kvm.h"
> +
> +int stats_test(int stats_fd, int size_stat)


The return value is not used by the caller. Perhaps make it a void ?

> +{
> +	ssize_t ret;
> +	int i;
> +	size_t size_desc, size_data = 0;
> +	struct kvm_stats_header header;
> +	struct kvm_stats_desc *stats_desc, *pdesc;
> +	void *stats_data;
> +
> +	/* Read kvm stats header */
> +	ret = read(stats_fd, &header, sizeof(header));
> +	TEST_ASSERT(ret == sizeof(header), "Read stats header");
> +	size_desc = sizeof(*stats_desc) + header.name_size;
> +
> +	/* Check id string in header, that should start with "kvm" */
> +	TEST_ASSERT(!strncmp(header.id, "kvm", 3) &&
> +			strlen(header.id) < KVM_STATS_ID_MAXLEN,
> +			"Invalid KVM stats type");
> +
> +	/* Sanity check for other fields in header */
> +	if (header.count == 0)


Does this need a message as to why count is zero ?

> +		return 0;
> +	/* Check overlap */
> +	TEST_ASSERT(header.desc_offset > 0 && header.data_offset > 0
> +			&& header.desc_offset >= sizeof(header)
> +			&& header.data_offset >= sizeof(header),
> +			"Invalid offset fields in header");
> +	TEST_ASSERT(header.desc_offset > header.data_offset
> +			|| (header.desc_offset + size_desc * header.count <=
> +				header.data_offset),
> +			"Descriptor block is overlapped with data block");
> +
> +	/* Allocate memory for stats descriptors */
> +	stats_desc = calloc(header.count, size_desc);
> +	TEST_ASSERT(stats_desc, "Allocate memory for stats descriptors");
> +	/* Read kvm stats descriptors */
> +	ret = pread(stats_fd, stats_desc,
> +			size_desc * header.count, header.desc_offset);
> +	TEST_ASSERT(ret == size_desc * header.count,
> +			"Read KVM stats descriptors");
> +
> +	/* Sanity check for fields in descriptors */
> +	for (i = 0; i < header.count; ++i) {
> +		pdesc = (void *)stats_desc + i * size_desc;
> +		/* Check type,unit,base boundaries */
> +		TEST_ASSERT((pdesc->flags & KVM_STATS_TYPE_MASK)
> +				<= KVM_STATS_TYPE_MAX, "Unknown KVM stats type");
> +		TEST_ASSERT((pdesc->flags & KVM_STATS_UNIT_MASK)
> +				<= KVM_STATS_UNIT_MAX, "Unknown KVM stats unit");
> +		TEST_ASSERT((pdesc->flags & KVM_STATS_BASE_MASK)
> +				<= KVM_STATS_BASE_MAX, "Unknown KVM stats base");
> +		/* Check exponent for stats unit
> +		 * Exponent for counter should be greater than or equal to 0
> +		 * Exponent for unit bytes should be greater than or equal to 0
> +		 * Exponent for unit seconds should be less than or equal to 0
> +		 * Exponent for unit clock cycles should be greater than or
> +		 * equal to 0
> +		 */
> +		switch (pdesc->flags & KVM_STATS_UNIT_MASK) {
> +		case KVM_STATS_UNIT_NONE:
> +		case KVM_STATS_UNIT_BYTES:
> +		case KVM_STATS_UNIT_CYCLES:
> +			TEST_ASSERT(pdesc->exponent >= 0,
> +					"Unsupported KVM stats unit");
> +			break;
> +		case KVM_STATS_UNIT_SECONDS:
> +			TEST_ASSERT(pdesc->exponent <= 0,
> +					"Unsupported KVM stats unit");
> +			break;
> +		}
> +		/* Check name string */
> +		TEST_ASSERT(strlen(pdesc->name) < header.name_size,
> +				"KVM stats name(%s) too long", pdesc->name);
> +		/* Check size field, which should not be zero */
> +		TEST_ASSERT(pdesc->size, "KVM descriptor(%s) with size of 0",
> +				pdesc->name);
> +		size_data += pdesc->size * size_stat;
> +	}
> +	/* Check overlap */
> +	TEST_ASSERT(header.data_offset >= header.desc_offset
> +			|| header.data_offset + size_data <= header.desc_offset,
> +			"Data block is overlapped with Descriptor block");
> +	/* Check validity of all stats data size */
> +	TEST_ASSERT(size_data >= header.count * size_stat,
> +			"Data size is not correct");
> +
> +	/* Allocate memory for stats data */
> +	stats_data = malloc(size_data);
> +	TEST_ASSERT(stats_data, "Allocate memory for stats data");
> +	/* Read kvm stats data as a bulk */
> +	ret = pread(stats_fd, stats_data, size_data, header.data_offset);
> +	TEST_ASSERT(ret == size_data, "Read KVM stats data");
> +	/* Read kvm stats data one by one */
> +	size_data = 0;
> +	for (i = 0; i < header.count; ++i) {
> +		pdesc = (void *)stats_desc + i * size_desc;
> +		ret = pread(stats_fd, stats_data, pdesc->size * size_stat,
> +				header.data_offset + size_data);
> +		TEST_ASSERT(ret == pdesc->size * size_stat,
> +				"Read data of KVM stats: %s", pdesc->name);
> +		size_data += pdesc->size * size_stat;
> +	}
> +
> +	free(stats_data);
> +	free(stats_desc);
> +	return 0;
> +}
> +
> +
> +int vm_stats_test(struct kvm_vm *vm)
> +{
> +	int stats_fd;
> +	struct kvm_vm_stats_data *stats_data;
> +
> +	/* Get fd for VM stats */
> +	stats_fd = vm_get_statsfd(vm);
> +	TEST_ASSERT(stats_fd >= 0, "Get VM stats fd");
> +
> +	stats_test(stats_fd, sizeof(stats_data->value[0]));
> +	close(stats_fd);
> +
> +	return 0;
> +}
> +
> +int vcpu_stats_test(struct kvm_vm *vm, int vcpu_id)
> +{
> +	int stats_fd;
> +	struct kvm_vcpu_stats_data *stats_data;
> +
> +	/* Get fd for VCPU stats */
> +	stats_fd = vcpu_get_statsfd(vm, vcpu_id);
> +	TEST_ASSERT(stats_fd >= 0, "Get VCPU stats fd");
> +
> +	stats_test(stats_fd, sizeof(stats_data->value[0]));
> +	close(stats_fd);
> +
> +	return 0;
> +}
> +
> +#define DEFAULT_NUM_VM		4
> +#define DEFAULT_NUM_VCPU	4
> +
> +/*
> + * Usage: kvm_bin_form_stats [#vm] [#vcpu]
> + * The first parameter #vm set the number of VMs being created.
> + * The second parameter #vcpu set the number of VCPUs being created.
> + * By default, DEFAULT_NUM_VM VM and DEFAULT_NUM_VCPU VCPU for the VM would be
> + * created for testing.
> + */
> +
> +int main(int argc, char *argv[])
> +{
> +	int max_vm = DEFAULT_NUM_VM, max_vcpu = DEFAULT_NUM_VCPU, ret, i, j;
> +	struct kvm_vm **vms;
> +
> +	/* Get the number of VMs and VCPUs that would be created for testing. */
> +	if (argc > 1) {
> +		max_vm = strtol(argv[1], NULL, 0);
> +		if (max_vm <= 0)
> +			max_vm = DEFAULT_NUM_VM;
> +	}
> +	if (argc > 2) {
> +		max_vcpu = strtol(argv[2], NULL, 0);
> +		if (max_vcpu <= 0)
> +			max_vcpu = DEFAULT_NUM_VCPU;
> +	}
> +
> +	/* Check the extension for binary stats */
> +	ret = kvm_check_cap(KVM_CAP_STATS_BINARY_FD);
> +	TEST_ASSERT(ret >= 0,
> +			"Binary form statistics interface is not supported");
> +
> +	/* Create VMs and VCPUs */
> +	vms = malloc(sizeof(vms[0]) * max_vm);
> +	TEST_ASSERT(vms, "Allocate memory for storing VM pointers");
> +	for (i = 0; i < max_vm; ++i) {
> +		vms[i] = vm_create(VM_MODE_DEFAULT,
> +				DEFAULT_GUEST_PHY_PAGES, O_RDWR);
> +		for (j = 0; j < max_vcpu; ++j)
> +			vm_vcpu_add(vms[i], j);
> +	}
> +
> +	/* Check stats read for every VM and VCPU */
> +	for (i = 0; i < max_vm; ++i) {
> +		vm_stats_test(vms[i]);
> +		for (j = 0; j < max_vcpu; ++j)
> +			vcpu_stats_test(vms[i], j);
> +	}
> +


Does it make sense to add one more test case here to test this fd 
interface on a VM or on a VCPU that has been deleted ? For example, how 
does this fd interface behave if we delete the 4th VM and the 4th VCPU 
in the 3rd VM ?

> +	for (i = 0; i < max_vm; ++i)
> +		kvm_vm_free(vms[i]);
> +	free(vms);
> +	return 0;
> +}
> diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
> index fc83f6c5902d..d9e0b2c8b906 100644
> --- a/tools/testing/selftests/kvm/lib/kvm_util.c
> +++ b/tools/testing/selftests/kvm/lib/kvm_util.c
> @@ -2090,3 +2090,15 @@ unsigned int vm_calc_num_guest_pages(enum vm_guest_mode mode, size_t size)
>   	n = DIV_ROUND_UP(size, vm_guest_mode_params[mode].page_size);
>   	return vm_adjust_num_guest_pages(mode, n);
>   }
> +
> +int vm_get_statsfd(struct kvm_vm *vm)
> +{
> +	return ioctl(vm->fd, KVM_STATS_GETFD, NULL);
> +}
> +
> +int vcpu_get_statsfd(struct kvm_vm *vm, uint32_t vcpuid)
> +{
> +	struct vcpu *vcpu = vcpu_find(vm, vcpuid);
> +
> +	return ioctl(vcpu->fd, KVM_STATS_GETFD, NULL);
> +}


Do we need separate functions if they are called just once ?  Or perhaps 
have a single function for the ioctl call, like ?

      int get_stats_fd(int fd, int type)

      {

             return ioctl(fd, type, NULL);

      }

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Re: [PATCH v6 4/4] KVM: selftests: Add selftest for KVM statistics data binary interface

[Jing Zhang]

Hi Krish,

On Wed, May 26, 2021 at 5:34 PM Krish Sadhukhan
<krish.sadhukhan@oracle.com> wrote:
>
>
> On 5/24/21 8:18 AM, Jing Zhang wrote:
> > Add selftest to check KVM stats descriptors validity.
> >
> > Reviewed-by: David Matlack <dmatlack@google.com>
> > Reviewed-by: Ricardo Koller <ricarkol@google.com>
> > Signed-off-by: Jing Zhang <jingzhangos@google.com>
> > ---
> >   tools/testing/selftests/kvm/.gitignore        |   1 +
> >   tools/testing/selftests/kvm/Makefile          |   3 +
> >   .../testing/selftests/kvm/include/kvm_util.h  |   3 +
> >   .../selftests/kvm/kvm_bin_form_stats.c        | 216 ++++++++++++++++++
> >   tools/testing/selftests/kvm/lib/kvm_util.c    |  12 +
> >   5 files changed, 235 insertions(+)
> >   create mode 100644 tools/testing/selftests/kvm/kvm_bin_form_stats.c
>
>
> We should probably follow the naming convention for the majority of the
> files in the kvm directory and name it kvm_stats_read_test.c or
> kvm_stats_test.c or something like that.
>
Sure. Will change the name.
> >
> > diff --git a/tools/testing/selftests/kvm/.gitignore b/tools/testing/selftests/kvm/.gitignore
> > index bd83158e0e0b..35796667c944 100644
> > --- a/tools/testing/selftests/kvm/.gitignore
> > +++ b/tools/testing/selftests/kvm/.gitignore
> > @@ -43,3 +43,4 @@
> >   /memslot_modification_stress_test
> >   /set_memory_region_test
> >   /steal_time
> > +/kvm_bin_form_stats
> > diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
> > index e439d027939d..2984c86c848a 100644
> > --- a/tools/testing/selftests/kvm/Makefile
> > +++ b/tools/testing/selftests/kvm/Makefile
> > @@ -76,6 +76,7 @@ TEST_GEN_PROGS_x86_64 += kvm_page_table_test
> >   TEST_GEN_PROGS_x86_64 += memslot_modification_stress_test
> >   TEST_GEN_PROGS_x86_64 += set_memory_region_test
> >   TEST_GEN_PROGS_x86_64 += steal_time
> > +TEST_GEN_PROGS_x86_64 += kvm_bin_form_stats
> >
> >   TEST_GEN_PROGS_aarch64 += aarch64/get-reg-list
> >   TEST_GEN_PROGS_aarch64 += aarch64/get-reg-list-sve
> > @@ -87,6 +88,7 @@ TEST_GEN_PROGS_aarch64 += kvm_create_max_vcpus
> >   TEST_GEN_PROGS_aarch64 += kvm_page_table_test
> >   TEST_GEN_PROGS_aarch64 += set_memory_region_test
> >   TEST_GEN_PROGS_aarch64 += steal_time
> > +TEST_GEN_PROGS_aarch64 += kvm_bin_form_stats
> >
> >   TEST_GEN_PROGS_s390x = s390x/memop
> >   TEST_GEN_PROGS_s390x += s390x/resets
> > @@ -96,6 +98,7 @@ TEST_GEN_PROGS_s390x += dirty_log_test
> >   TEST_GEN_PROGS_s390x += kvm_create_max_vcpus
> >   TEST_GEN_PROGS_s390x += kvm_page_table_test
> >   TEST_GEN_PROGS_s390x += set_memory_region_test
> > +TEST_GEN_PROGS_s390x += kvm_bin_form_stats
> >
> >   TEST_GEN_PROGS += $(TEST_GEN_PROGS_$(UNAME_M))
> >   LIBKVM += $(LIBKVM_$(UNAME_M))
> > diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h
> > index a8f022794ce3..ee01a67022d9 100644
> > --- a/tools/testing/selftests/kvm/include/kvm_util.h
> > +++ b/tools/testing/selftests/kvm/include/kvm_util.h
> > @@ -387,4 +387,7 @@ uint64_t get_ucall(struct kvm_vm *vm, uint32_t vcpu_id, struct ucall *uc);
> >   #define GUEST_ASSERT_4(_condition, arg1, arg2, arg3, arg4) \
> >       __GUEST_ASSERT((_condition), 4, (arg1), (arg2), (arg3), (arg4))
> >
> > +int vm_get_statsfd(struct kvm_vm *vm);
> > +int vcpu_get_statsfd(struct kvm_vm *vm, uint32_t vcpuid);
> > +
> >   #endif /* SELFTEST_KVM_UTIL_H */
> > diff --git a/tools/testing/selftests/kvm/kvm_bin_form_stats.c b/tools/testing/selftests/kvm/kvm_bin_form_stats.c
> > new file mode 100644
> > index 000000000000..09e12c5838af
> > --- /dev/null
> > +++ b/tools/testing/selftests/kvm/kvm_bin_form_stats.c
> > @@ -0,0 +1,216 @@
> > +// SPDX-License-Identifier: GPL-2.0-only
> > +/*
> > + * kvm_bin_form_stats
> > + *
> > + * Copyright (C) 2021, Google LLC.
> > + *
> > + * Test the fd-based interface for KVM statistics.
> > + */
> > +
> > +#define _GNU_SOURCE /* for program_invocation_short_name */
> > +#include <fcntl.h>
> > +#include <stdio.h>
> > +#include <stdlib.h>
> > +#include <string.h>
> > +#include <errno.h>
> > +
> > +#include "test_util.h"
> > +
> > +#include "kvm_util.h"
> > +#include "asm/kvm.h"
> > +#include "linux/kvm.h"
> > +
> > +int stats_test(int stats_fd, int size_stat)
>
>
> The return value is not used by the caller. Perhaps make it a void ?
>
Will do.
> > +{
> > +     ssize_t ret;
> > +     int i;
> > +     size_t size_desc, size_data = 0;
> > +     struct kvm_stats_header header;
> > +     struct kvm_stats_desc *stats_desc, *pdesc;
> > +     void *stats_data;
> > +
> > +     /* Read kvm stats header */
> > +     ret = read(stats_fd, &header, sizeof(header));
> > +     TEST_ASSERT(ret == sizeof(header), "Read stats header");
> > +     size_desc = sizeof(*stats_desc) + header.name_size;
> > +
> > +     /* Check id string in header, that should start with "kvm" */
> > +     TEST_ASSERT(!strncmp(header.id, "kvm", 3) &&
> > +                     strlen(header.id) < KVM_STATS_ID_MAXLEN,
> > +                     "Invalid KVM stats type");
> > +
> > +     /* Sanity check for other fields in header */
> > +     if (header.count == 0)
>
>
> Does this need a message as to why count is zero ?
>
Will add a warning message here.
> > +             return 0;
> > +     /* Check overlap */
> > +     TEST_ASSERT(header.desc_offset > 0 && header.data_offset > 0
> > +                     && header.desc_offset >= sizeof(header)
> > +                     && header.data_offset >= sizeof(header),
> > +                     "Invalid offset fields in header");
> > +     TEST_ASSERT(header.desc_offset > header.data_offset
> > +                     || (header.desc_offset + size_desc * header.count <=
> > +                             header.data_offset),
> > +                     "Descriptor block is overlapped with data block");
> > +
> > +     /* Allocate memory for stats descriptors */
> > +     stats_desc = calloc(header.count, size_desc);
> > +     TEST_ASSERT(stats_desc, "Allocate memory for stats descriptors");
> > +     /* Read kvm stats descriptors */
> > +     ret = pread(stats_fd, stats_desc,
> > +                     size_desc * header.count, header.desc_offset);
> > +     TEST_ASSERT(ret == size_desc * header.count,
> > +                     "Read KVM stats descriptors");
> > +
> > +     /* Sanity check for fields in descriptors */
> > +     for (i = 0; i < header.count; ++i) {
> > +             pdesc = (void *)stats_desc + i * size_desc;
> > +             /* Check type,unit,base boundaries */
> > +             TEST_ASSERT((pdesc->flags & KVM_STATS_TYPE_MASK)
> > +                             <= KVM_STATS_TYPE_MAX, "Unknown KVM stats type");
> > +             TEST_ASSERT((pdesc->flags & KVM_STATS_UNIT_MASK)
> > +                             <= KVM_STATS_UNIT_MAX, "Unknown KVM stats unit");
> > +             TEST_ASSERT((pdesc->flags & KVM_STATS_BASE_MASK)
> > +                             <= KVM_STATS_BASE_MAX, "Unknown KVM stats base");
> > +             /* Check exponent for stats unit
> > +              * Exponent for counter should be greater than or equal to 0
> > +              * Exponent for unit bytes should be greater than or equal to 0
> > +              * Exponent for unit seconds should be less than or equal to 0
> > +              * Exponent for unit clock cycles should be greater than or
> > +              * equal to 0
> > +              */
> > +             switch (pdesc->flags & KVM_STATS_UNIT_MASK) {
> > +             case KVM_STATS_UNIT_NONE:
> > +             case KVM_STATS_UNIT_BYTES:
> > +             case KVM_STATS_UNIT_CYCLES:
> > +                     TEST_ASSERT(pdesc->exponent >= 0,
> > +                                     "Unsupported KVM stats unit");
> > +                     break;
> > +             case KVM_STATS_UNIT_SECONDS:
> > +                     TEST_ASSERT(pdesc->exponent <= 0,
> > +                                     "Unsupported KVM stats unit");
> > +                     break;
> > +             }
> > +             /* Check name string */
> > +             TEST_ASSERT(strlen(pdesc->name) < header.name_size,
> > +                             "KVM stats name(%s) too long", pdesc->name);
> > +             /* Check size field, which should not be zero */
> > +             TEST_ASSERT(pdesc->size, "KVM descriptor(%s) with size of 0",
> > +                             pdesc->name);
> > +             size_data += pdesc->size * size_stat;
> > +     }
> > +     /* Check overlap */
> > +     TEST_ASSERT(header.data_offset >= header.desc_offset
> > +                     || header.data_offset + size_data <= header.desc_offset,
> > +                     "Data block is overlapped with Descriptor block");
> > +     /* Check validity of all stats data size */
> > +     TEST_ASSERT(size_data >= header.count * size_stat,
> > +                     "Data size is not correct");
> > +
> > +     /* Allocate memory for stats data */
> > +     stats_data = malloc(size_data);
> > +     TEST_ASSERT(stats_data, "Allocate memory for stats data");
> > +     /* Read kvm stats data as a bulk */
> > +     ret = pread(stats_fd, stats_data, size_data, header.data_offset);
> > +     TEST_ASSERT(ret == size_data, "Read KVM stats data");
> > +     /* Read kvm stats data one by one */
> > +     size_data = 0;
> > +     for (i = 0; i < header.count; ++i) {
> > +             pdesc = (void *)stats_desc + i * size_desc;
> > +             ret = pread(stats_fd, stats_data, pdesc->size * size_stat,
> > +                             header.data_offset + size_data);
> > +             TEST_ASSERT(ret == pdesc->size * size_stat,
> > +                             "Read data of KVM stats: %s", pdesc->name);
> > +             size_data += pdesc->size * size_stat;
> > +     }
> > +
> > +     free(stats_data);
> > +     free(stats_desc);
> > +     return 0;
> > +}
> > +
> > +
> > +int vm_stats_test(struct kvm_vm *vm)
> > +{
> > +     int stats_fd;
> > +     struct kvm_vm_stats_data *stats_data;
> > +
> > +     /* Get fd for VM stats */
> > +     stats_fd = vm_get_statsfd(vm);
> > +     TEST_ASSERT(stats_fd >= 0, "Get VM stats fd");
> > +
> > +     stats_test(stats_fd, sizeof(stats_data->value[0]));
> > +     close(stats_fd);
> > +
> > +     return 0;
> > +}
> > +
> > +int vcpu_stats_test(struct kvm_vm *vm, int vcpu_id)
> > +{
> > +     int stats_fd;
> > +     struct kvm_vcpu_stats_data *stats_data;
> > +
> > +     /* Get fd for VCPU stats */
> > +     stats_fd = vcpu_get_statsfd(vm, vcpu_id);
> > +     TEST_ASSERT(stats_fd >= 0, "Get VCPU stats fd");
> > +
> > +     stats_test(stats_fd, sizeof(stats_data->value[0]));
> > +     close(stats_fd);
> > +
> > +     return 0;
> > +}
> > +
> > +#define DEFAULT_NUM_VM               4
> > +#define DEFAULT_NUM_VCPU     4
> > +
> > +/*
> > + * Usage: kvm_bin_form_stats [#vm] [#vcpu]
> > + * The first parameter #vm set the number of VMs being created.
> > + * The second parameter #vcpu set the number of VCPUs being created.
> > + * By default, DEFAULT_NUM_VM VM and DEFAULT_NUM_VCPU VCPU for the VM would be
> > + * created for testing.
> > + */
> > +
> > +int main(int argc, char *argv[])
> > +{
> > +     int max_vm = DEFAULT_NUM_VM, max_vcpu = DEFAULT_NUM_VCPU, ret, i, j;
> > +     struct kvm_vm **vms;
> > +
> > +     /* Get the number of VMs and VCPUs that would be created for testing. */
> > +     if (argc > 1) {
> > +             max_vm = strtol(argv[1], NULL, 0);
> > +             if (max_vm <= 0)
> > +                     max_vm = DEFAULT_NUM_VM;
> > +     }
> > +     if (argc > 2) {
> > +             max_vcpu = strtol(argv[2], NULL, 0);
> > +             if (max_vcpu <= 0)
> > +                     max_vcpu = DEFAULT_NUM_VCPU;
> > +     }
> > +
> > +     /* Check the extension for binary stats */
> > +     ret = kvm_check_cap(KVM_CAP_STATS_BINARY_FD);
> > +     TEST_ASSERT(ret >= 0,
> > +                     "Binary form statistics interface is not supported");
> > +
> > +     /* Create VMs and VCPUs */
> > +     vms = malloc(sizeof(vms[0]) * max_vm);
> > +     TEST_ASSERT(vms, "Allocate memory for storing VM pointers");
> > +     for (i = 0; i < max_vm; ++i) {
> > +             vms[i] = vm_create(VM_MODE_DEFAULT,
> > +                             DEFAULT_GUEST_PHY_PAGES, O_RDWR);
> > +             for (j = 0; j < max_vcpu; ++j)
> > +                     vm_vcpu_add(vms[i], j);
> > +     }
> > +
> > +     /* Check stats read for every VM and VCPU */
> > +     for (i = 0; i < max_vm; ++i) {
> > +             vm_stats_test(vms[i]);
> > +             for (j = 0; j < max_vcpu; ++j)
> > +                     vcpu_stats_test(vms[i], j);
> > +     }
> > +
>
>
> Does it make sense to add one more test case here to test this fd
> interface on a VM or on a VCPU that has been deleted ? For example, how
> does this fd interface behave if we delete the 4th VM and the 4th VCPU
> in the 3rd VM ?
>
If you meant to test the behavior when we are trying to access a
invalid fd which belongs
to a VM or VCPU that doesn't exist, that's a good idea. I will add a
test for that. thanks.
> > +     for (i = 0; i < max_vm; ++i)
> > +             kvm_vm_free(vms[i]);
> > +     free(vms);
> > +     return 0;
> > +}
> > diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
> > index fc83f6c5902d..d9e0b2c8b906 100644
> > --- a/tools/testing/selftests/kvm/lib/kvm_util.c
> > +++ b/tools/testing/selftests/kvm/lib/kvm_util.c
> > @@ -2090,3 +2090,15 @@ unsigned int vm_calc_num_guest_pages(enum vm_guest_mode mode, size_t size)
> >       n = DIV_ROUND_UP(size, vm_guest_mode_params[mode].page_size);
> >       return vm_adjust_num_guest_pages(mode, n);
> >   }
> > +
> > +int vm_get_statsfd(struct kvm_vm *vm)
> > +{
> > +     return ioctl(vm->fd, KVM_STATS_GETFD, NULL);
> > +}
> > +
> > +int vcpu_get_statsfd(struct kvm_vm *vm, uint32_t vcpuid)
> > +{
> > +     struct vcpu *vcpu = vcpu_find(vm, vcpuid);
> > +
> > +     return ioctl(vcpu->fd, KVM_STATS_GETFD, NULL);
> > +}
>
>
> Do we need separate functions if they are called just once ?  Or perhaps
> have a single function for the ioctl call, like ?
>
>       int get_stats_fd(int fd, int type)
>
>       {
>
>              return ioctl(fd, type, NULL);
>
>       }
>
I guess two separate functions are more clear, one function does one thing.

Thanks,
Jing

Re: [PATCH v6 4/4] KVM: selftests: Add selftest for KVM statistics data binary interface

[Jing Zhang]

Hi Krish,

On Wed, May 26, 2021 at 5:34 PM Krish Sadhukhan
<krish.sadhukhan@oracle.com> wrote:
>
>
> On 5/24/21 8:18 AM, Jing Zhang wrote:
> > Add selftest to check KVM stats descriptors validity.
> >
> > Reviewed-by: David Matlack <dmatlack@google.com>
> > Reviewed-by: Ricardo Koller <ricarkol@google.com>
> > Signed-off-by: Jing Zhang <jingzhangos@google.com>
> > ---
> >   tools/testing/selftests/kvm/.gitignore        |   1 +
> >   tools/testing/selftests/kvm/Makefile          |   3 +
> >   .../testing/selftests/kvm/include/kvm_util.h  |   3 +
> >   .../selftests/kvm/kvm_bin_form_stats.c        | 216 ++++++++++++++++++
> >   tools/testing/selftests/kvm/lib/kvm_util.c    |  12 +
> >   5 files changed, 235 insertions(+)
> >   create mode 100644 tools/testing/selftests/kvm/kvm_bin_form_stats.c
>
>
> We should probably follow the naming convention for the majority of the
> files in the kvm directory and name it kvm_stats_read_test.c or
> kvm_stats_test.c or something like that.
>
Sure. Will change the name.
> >
> > diff --git a/tools/testing/selftests/kvm/.gitignore b/tools/testing/selftests/kvm/.gitignore
> > index bd83158e0e0b..35796667c944 100644
> > --- a/tools/testing/selftests/kvm/.gitignore
> > +++ b/tools/testing/selftests/kvm/.gitignore
> > @@ -43,3 +43,4 @@
> >   /memslot_modification_stress_test
> >   /set_memory_region_test
> >   /steal_time
> > +/kvm_bin_form_stats
> > diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
> > index e439d027939d..2984c86c848a 100644
> > --- a/tools/testing/selftests/kvm/Makefile
> > +++ b/tools/testing/selftests/kvm/Makefile
> > @@ -76,6 +76,7 @@ TEST_GEN_PROGS_x86_64 += kvm_page_table_test
> >   TEST_GEN_PROGS_x86_64 += memslot_modification_stress_test
> >   TEST_GEN_PROGS_x86_64 += set_memory_region_test
> >   TEST_GEN_PROGS_x86_64 += steal_time
> > +TEST_GEN_PROGS_x86_64 += kvm_bin_form_stats
> >
> >   TEST_GEN_PROGS_aarch64 += aarch64/get-reg-list
> >   TEST_GEN_PROGS_aarch64 += aarch64/get-reg-list-sve
> > @@ -87,6 +88,7 @@ TEST_GEN_PROGS_aarch64 += kvm_create_max_vcpus
> >   TEST_GEN_PROGS_aarch64 += kvm_page_table_test
> >   TEST_GEN_PROGS_aarch64 += set_memory_region_test
> >   TEST_GEN_PROGS_aarch64 += steal_time
> > +TEST_GEN_PROGS_aarch64 += kvm_bin_form_stats
> >
> >   TEST_GEN_PROGS_s390x = s390x/memop
> >   TEST_GEN_PROGS_s390x += s390x/resets
> > @@ -96,6 +98,7 @@ TEST_GEN_PROGS_s390x += dirty_log_test
> >   TEST_GEN_PROGS_s390x += kvm_create_max_vcpus
> >   TEST_GEN_PROGS_s390x += kvm_page_table_test
> >   TEST_GEN_PROGS_s390x += set_memory_region_test
> > +TEST_GEN_PROGS_s390x += kvm_bin_form_stats
> >
> >   TEST_GEN_PROGS += $(TEST_GEN_PROGS_$(UNAME_M))
> >   LIBKVM += $(LIBKVM_$(UNAME_M))
> > diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h
> > index a8f022794ce3..ee01a67022d9 100644
> > --- a/tools/testing/selftests/kvm/include/kvm_util.h
> > +++ b/tools/testing/selftests/kvm/include/kvm_util.h
> > @@ -387,4 +387,7 @@ uint64_t get_ucall(struct kvm_vm *vm, uint32_t vcpu_id, struct ucall *uc);
> >   #define GUEST_ASSERT_4(_condition, arg1, arg2, arg3, arg4) \
> >       __GUEST_ASSERT((_condition), 4, (arg1), (arg2), (arg3), (arg4))
> >
> > +int vm_get_statsfd(struct kvm_vm *vm);
> > +int vcpu_get_statsfd(struct kvm_vm *vm, uint32_t vcpuid);
> > +
> >   #endif /* SELFTEST_KVM_UTIL_H */
> > diff --git a/tools/testing/selftests/kvm/kvm_bin_form_stats.c b/tools/testing/selftests/kvm/kvm_bin_form_stats.c
> > new file mode 100644
> > index 000000000000..09e12c5838af
> > --- /dev/null
> > +++ b/tools/testing/selftests/kvm/kvm_bin_form_stats.c
> > @@ -0,0 +1,216 @@
> > +// SPDX-License-Identifier: GPL-2.0-only
> > +/*
> > + * kvm_bin_form_stats
> > + *
> > + * Copyright (C) 2021, Google LLC.
> > + *
> > + * Test the fd-based interface for KVM statistics.
> > + */
> > +
> > +#define _GNU_SOURCE /* for program_invocation_short_name */
> > +#include <fcntl.h>
> > +#include <stdio.h>
> > +#include <stdlib.h>
> > +#include <string.h>
> > +#include <errno.h>
> > +
> > +#include "test_util.h"
> > +
> > +#include "kvm_util.h"
> > +#include "asm/kvm.h"
> > +#include "linux/kvm.h"
> > +
> > +int stats_test(int stats_fd, int size_stat)
>
>
> The return value is not used by the caller. Perhaps make it a void ?
>
Will do.
> > +{
> > +     ssize_t ret;
> > +     int i;
> > +     size_t size_desc, size_data = 0;
> > +     struct kvm_stats_header header;
> > +     struct kvm_stats_desc *stats_desc, *pdesc;
> > +     void *stats_data;
> > +
> > +     /* Read kvm stats header */
> > +     ret = read(stats_fd, &header, sizeof(header));
> > +     TEST_ASSERT(ret = sizeof(header), "Read stats header");
> > +     size_desc = sizeof(*stats_desc) + header.name_size;
> > +
> > +     /* Check id string in header, that should start with "kvm" */
> > +     TEST_ASSERT(!strncmp(header.id, "kvm", 3) &&
> > +                     strlen(header.id) < KVM_STATS_ID_MAXLEN,
> > +                     "Invalid KVM stats type");
> > +
> > +     /* Sanity check for other fields in header */
> > +     if (header.count = 0)
>
>
> Does this need a message as to why count is zero ?
>
Will add a warning message here.
> > +             return 0;
> > +     /* Check overlap */
> > +     TEST_ASSERT(header.desc_offset > 0 && header.data_offset > 0
> > +                     && header.desc_offset >= sizeof(header)
> > +                     && header.data_offset >= sizeof(header),
> > +                     "Invalid offset fields in header");
> > +     TEST_ASSERT(header.desc_offset > header.data_offset
> > +                     || (header.desc_offset + size_desc * header.count <> > +                             header.data_offset),
> > +                     "Descriptor block is overlapped with data block");
> > +
> > +     /* Allocate memory for stats descriptors */
> > +     stats_desc = calloc(header.count, size_desc);
> > +     TEST_ASSERT(stats_desc, "Allocate memory for stats descriptors");
> > +     /* Read kvm stats descriptors */
> > +     ret = pread(stats_fd, stats_desc,
> > +                     size_desc * header.count, header.desc_offset);
> > +     TEST_ASSERT(ret = size_desc * header.count,
> > +                     "Read KVM stats descriptors");
> > +
> > +     /* Sanity check for fields in descriptors */
> > +     for (i = 0; i < header.count; ++i) {
> > +             pdesc = (void *)stats_desc + i * size_desc;
> > +             /* Check type,unit,base boundaries */
> > +             TEST_ASSERT((pdesc->flags & KVM_STATS_TYPE_MASK)
> > +                             <= KVM_STATS_TYPE_MAX, "Unknown KVM stats type");
> > +             TEST_ASSERT((pdesc->flags & KVM_STATS_UNIT_MASK)
> > +                             <= KVM_STATS_UNIT_MAX, "Unknown KVM stats unit");
> > +             TEST_ASSERT((pdesc->flags & KVM_STATS_BASE_MASK)
> > +                             <= KVM_STATS_BASE_MAX, "Unknown KVM stats base");
> > +             /* Check exponent for stats unit
> > +              * Exponent for counter should be greater than or equal to 0
> > +              * Exponent for unit bytes should be greater than or equal to 0
> > +              * Exponent for unit seconds should be less than or equal to 0
> > +              * Exponent for unit clock cycles should be greater than or
> > +              * equal to 0
> > +              */
> > +             switch (pdesc->flags & KVM_STATS_UNIT_MASK) {
> > +             case KVM_STATS_UNIT_NONE:
> > +             case KVM_STATS_UNIT_BYTES:
> > +             case KVM_STATS_UNIT_CYCLES:
> > +                     TEST_ASSERT(pdesc->exponent >= 0,
> > +                                     "Unsupported KVM stats unit");
> > +                     break;
> > +             case KVM_STATS_UNIT_SECONDS:
> > +                     TEST_ASSERT(pdesc->exponent <= 0,
> > +                                     "Unsupported KVM stats unit");
> > +                     break;
> > +             }
> > +             /* Check name string */
> > +             TEST_ASSERT(strlen(pdesc->name) < header.name_size,
> > +                             "KVM stats name(%s) too long", pdesc->name);
> > +             /* Check size field, which should not be zero */
> > +             TEST_ASSERT(pdesc->size, "KVM descriptor(%s) with size of 0",
> > +                             pdesc->name);
> > +             size_data += pdesc->size * size_stat;
> > +     }
> > +     /* Check overlap */
> > +     TEST_ASSERT(header.data_offset >= header.desc_offset
> > +                     || header.data_offset + size_data <= header.desc_offset,
> > +                     "Data block is overlapped with Descriptor block");
> > +     /* Check validity of all stats data size */
> > +     TEST_ASSERT(size_data >= header.count * size_stat,
> > +                     "Data size is not correct");
> > +
> > +     /* Allocate memory for stats data */
> > +     stats_data = malloc(size_data);
> > +     TEST_ASSERT(stats_data, "Allocate memory for stats data");
> > +     /* Read kvm stats data as a bulk */
> > +     ret = pread(stats_fd, stats_data, size_data, header.data_offset);
> > +     TEST_ASSERT(ret = size_data, "Read KVM stats data");
> > +     /* Read kvm stats data one by one */
> > +     size_data = 0;
> > +     for (i = 0; i < header.count; ++i) {
> > +             pdesc = (void *)stats_desc + i * size_desc;
> > +             ret = pread(stats_fd, stats_data, pdesc->size * size_stat,
> > +                             header.data_offset + size_data);
> > +             TEST_ASSERT(ret = pdesc->size * size_stat,
> > +                             "Read data of KVM stats: %s", pdesc->name);
> > +             size_data += pdesc->size * size_stat;
> > +     }
> > +
> > +     free(stats_data);
> > +     free(stats_desc);
> > +     return 0;
> > +}
> > +
> > +
> > +int vm_stats_test(struct kvm_vm *vm)
> > +{
> > +     int stats_fd;
> > +     struct kvm_vm_stats_data *stats_data;
> > +
> > +     /* Get fd for VM stats */
> > +     stats_fd = vm_get_statsfd(vm);
> > +     TEST_ASSERT(stats_fd >= 0, "Get VM stats fd");
> > +
> > +     stats_test(stats_fd, sizeof(stats_data->value[0]));
> > +     close(stats_fd);
> > +
> > +     return 0;
> > +}
> > +
> > +int vcpu_stats_test(struct kvm_vm *vm, int vcpu_id)
> > +{
> > +     int stats_fd;
> > +     struct kvm_vcpu_stats_data *stats_data;
> > +
> > +     /* Get fd for VCPU stats */
> > +     stats_fd = vcpu_get_statsfd(vm, vcpu_id);
> > +     TEST_ASSERT(stats_fd >= 0, "Get VCPU stats fd");
> > +
> > +     stats_test(stats_fd, sizeof(stats_data->value[0]));
> > +     close(stats_fd);
> > +
> > +     return 0;
> > +}
> > +
> > +#define DEFAULT_NUM_VM               4
> > +#define DEFAULT_NUM_VCPU     4
> > +
> > +/*
> > + * Usage: kvm_bin_form_stats [#vm] [#vcpu]
> > + * The first parameter #vm set the number of VMs being created.
> > + * The second parameter #vcpu set the number of VCPUs being created.
> > + * By default, DEFAULT_NUM_VM VM and DEFAULT_NUM_VCPU VCPU for the VM would be
> > + * created for testing.
> > + */
> > +
> > +int main(int argc, char *argv[])
> > +{
> > +     int max_vm = DEFAULT_NUM_VM, max_vcpu = DEFAULT_NUM_VCPU, ret, i, j;
> > +     struct kvm_vm **vms;
> > +
> > +     /* Get the number of VMs and VCPUs that would be created for testing. */
> > +     if (argc > 1) {
> > +             max_vm = strtol(argv[1], NULL, 0);
> > +             if (max_vm <= 0)
> > +                     max_vm = DEFAULT_NUM_VM;
> > +     }
> > +     if (argc > 2) {
> > +             max_vcpu = strtol(argv[2], NULL, 0);
> > +             if (max_vcpu <= 0)
> > +                     max_vcpu = DEFAULT_NUM_VCPU;
> > +     }
> > +
> > +     /* Check the extension for binary stats */
> > +     ret = kvm_check_cap(KVM_CAP_STATS_BINARY_FD);
> > +     TEST_ASSERT(ret >= 0,
> > +                     "Binary form statistics interface is not supported");
> > +
> > +     /* Create VMs and VCPUs */
> > +     vms = malloc(sizeof(vms[0]) * max_vm);
> > +     TEST_ASSERT(vms, "Allocate memory for storing VM pointers");
> > +     for (i = 0; i < max_vm; ++i) {
> > +             vms[i] = vm_create(VM_MODE_DEFAULT,
> > +                             DEFAULT_GUEST_PHY_PAGES, O_RDWR);
> > +             for (j = 0; j < max_vcpu; ++j)
> > +                     vm_vcpu_add(vms[i], j);
> > +     }
> > +
> > +     /* Check stats read for every VM and VCPU */
> > +     for (i = 0; i < max_vm; ++i) {
> > +             vm_stats_test(vms[i]);
> > +             for (j = 0; j < max_vcpu; ++j)
> > +                     vcpu_stats_test(vms[i], j);
> > +     }
> > +
>
>
> Does it make sense to add one more test case here to test this fd
> interface on a VM or on a VCPU that has been deleted ? For example, how
> does this fd interface behave if we delete the 4th VM and the 4th VCPU
> in the 3rd VM ?
>
If you meant to test the behavior when we are trying to access a
invalid fd which belongs
to a VM or VCPU that doesn't exist, that's a good idea. I will add a
test for that. thanks.
> > +     for (i = 0; i < max_vm; ++i)
> > +             kvm_vm_free(vms[i]);
> > +     free(vms);
> > +     return 0;
> > +}
> > diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
> > index fc83f6c5902d..d9e0b2c8b906 100644
> > --- a/tools/testing/selftests/kvm/lib/kvm_util.c
> > +++ b/tools/testing/selftests/kvm/lib/kvm_util.c
> > @@ -2090,3 +2090,15 @@ unsigned int vm_calc_num_guest_pages(enum vm_guest_mode mode, size_t size)
> >       n = DIV_ROUND_UP(size, vm_guest_mode_params[mode].page_size);
> >       return vm_adjust_num_guest_pages(mode, n);
> >   }
> > +
> > +int vm_get_statsfd(struct kvm_vm *vm)
> > +{
> > +     return ioctl(vm->fd, KVM_STATS_GETFD, NULL);
> > +}
> > +
> > +int vcpu_get_statsfd(struct kvm_vm *vm, uint32_t vcpuid)
> > +{
> > +     struct vcpu *vcpu = vcpu_find(vm, vcpuid);
> > +
> > +     return ioctl(vcpu->fd, KVM_STATS_GETFD, NULL);
> > +}
>
>
> Do we need separate functions if they are called just once ?  Or perhaps
> have a single function for the ioctl call, like ?
>
>       int get_stats_fd(int fd, int type)
>
>       {
>
>              return ioctl(fd, type, NULL);
>
>       }
>
I guess two separate functions are more clear, one function does one thing.

Thanks,
Jing

Re: [PATCH v6 4/4] KVM: selftests: Add selftest for KVM statistics data binary interface

[Jing Zhang]

Hi Krish,

On Wed, May 26, 2021 at 5:34 PM Krish Sadhukhan
<krish.sadhukhan@oracle.com> wrote:
>
>
> On 5/24/21 8:18 AM, Jing Zhang wrote:
> > Add selftest to check KVM stats descriptors validity.
> >
> > Reviewed-by: David Matlack <dmatlack@google.com>
> > Reviewed-by: Ricardo Koller <ricarkol@google.com>
> > Signed-off-by: Jing Zhang <jingzhangos@google.com>
> > ---
> >   tools/testing/selftests/kvm/.gitignore        |   1 +
> >   tools/testing/selftests/kvm/Makefile          |   3 +
> >   .../testing/selftests/kvm/include/kvm_util.h  |   3 +
> >   .../selftests/kvm/kvm_bin_form_stats.c        | 216 ++++++++++++++++++
> >   tools/testing/selftests/kvm/lib/kvm_util.c    |  12 +
> >   5 files changed, 235 insertions(+)
> >   create mode 100644 tools/testing/selftests/kvm/kvm_bin_form_stats.c
>
>
> We should probably follow the naming convention for the majority of the
> files in the kvm directory and name it kvm_stats_read_test.c or
> kvm_stats_test.c or something like that.
>
Sure. Will change the name.
> >
> > diff --git a/tools/testing/selftests/kvm/.gitignore b/tools/testing/selftests/kvm/.gitignore
> > index bd83158e0e0b..35796667c944 100644
> > --- a/tools/testing/selftests/kvm/.gitignore
> > +++ b/tools/testing/selftests/kvm/.gitignore
> > @@ -43,3 +43,4 @@
> >   /memslot_modification_stress_test
> >   /set_memory_region_test
> >   /steal_time
> > +/kvm_bin_form_stats
> > diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
> > index e439d027939d..2984c86c848a 100644
> > --- a/tools/testing/selftests/kvm/Makefile
> > +++ b/tools/testing/selftests/kvm/Makefile
> > @@ -76,6 +76,7 @@ TEST_GEN_PROGS_x86_64 += kvm_page_table_test
> >   TEST_GEN_PROGS_x86_64 += memslot_modification_stress_test
> >   TEST_GEN_PROGS_x86_64 += set_memory_region_test
> >   TEST_GEN_PROGS_x86_64 += steal_time
> > +TEST_GEN_PROGS_x86_64 += kvm_bin_form_stats
> >
> >   TEST_GEN_PROGS_aarch64 += aarch64/get-reg-list
> >   TEST_GEN_PROGS_aarch64 += aarch64/get-reg-list-sve
> > @@ -87,6 +88,7 @@ TEST_GEN_PROGS_aarch64 += kvm_create_max_vcpus
> >   TEST_GEN_PROGS_aarch64 += kvm_page_table_test
> >   TEST_GEN_PROGS_aarch64 += set_memory_region_test
> >   TEST_GEN_PROGS_aarch64 += steal_time
> > +TEST_GEN_PROGS_aarch64 += kvm_bin_form_stats
> >
> >   TEST_GEN_PROGS_s390x = s390x/memop
> >   TEST_GEN_PROGS_s390x += s390x/resets
> > @@ -96,6 +98,7 @@ TEST_GEN_PROGS_s390x += dirty_log_test
> >   TEST_GEN_PROGS_s390x += kvm_create_max_vcpus
> >   TEST_GEN_PROGS_s390x += kvm_page_table_test
> >   TEST_GEN_PROGS_s390x += set_memory_region_test
> > +TEST_GEN_PROGS_s390x += kvm_bin_form_stats
> >
> >   TEST_GEN_PROGS += $(TEST_GEN_PROGS_$(UNAME_M))
> >   LIBKVM += $(LIBKVM_$(UNAME_M))
> > diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h
> > index a8f022794ce3..ee01a67022d9 100644
> > --- a/tools/testing/selftests/kvm/include/kvm_util.h
> > +++ b/tools/testing/selftests/kvm/include/kvm_util.h
> > @@ -387,4 +387,7 @@ uint64_t get_ucall(struct kvm_vm *vm, uint32_t vcpu_id, struct ucall *uc);
> >   #define GUEST_ASSERT_4(_condition, arg1, arg2, arg3, arg4) \
> >       __GUEST_ASSERT((_condition), 4, (arg1), (arg2), (arg3), (arg4))
> >
> > +int vm_get_statsfd(struct kvm_vm *vm);
> > +int vcpu_get_statsfd(struct kvm_vm *vm, uint32_t vcpuid);
> > +
> >   #endif /* SELFTEST_KVM_UTIL_H */
> > diff --git a/tools/testing/selftests/kvm/kvm_bin_form_stats.c b/tools/testing/selftests/kvm/kvm_bin_form_stats.c
> > new file mode 100644
> > index 000000000000..09e12c5838af
> > --- /dev/null
> > +++ b/tools/testing/selftests/kvm/kvm_bin_form_stats.c
> > @@ -0,0 +1,216 @@
> > +// SPDX-License-Identifier: GPL-2.0-only
> > +/*
> > + * kvm_bin_form_stats
> > + *
> > + * Copyright (C) 2021, Google LLC.
> > + *
> > + * Test the fd-based interface for KVM statistics.
> > + */
> > +
> > +#define _GNU_SOURCE /* for program_invocation_short_name */
> > +#include <fcntl.h>
> > +#include <stdio.h>
> > +#include <stdlib.h>
> > +#include <string.h>
> > +#include <errno.h>
> > +
> > +#include "test_util.h"
> > +
> > +#include "kvm_util.h"
> > +#include "asm/kvm.h"
> > +#include "linux/kvm.h"
> > +
> > +int stats_test(int stats_fd, int size_stat)
>
>
> The return value is not used by the caller. Perhaps make it a void ?
>
Will do.
> > +{
> > +     ssize_t ret;
> > +     int i;
> > +     size_t size_desc, size_data = 0;
> > +     struct kvm_stats_header header;
> > +     struct kvm_stats_desc *stats_desc, *pdesc;
> > +     void *stats_data;
> > +
> > +     /* Read kvm stats header */
> > +     ret = read(stats_fd, &header, sizeof(header));
> > +     TEST_ASSERT(ret == sizeof(header), "Read stats header");
> > +     size_desc = sizeof(*stats_desc) + header.name_size;
> > +
> > +     /* Check id string in header, that should start with "kvm" */
> > +     TEST_ASSERT(!strncmp(header.id, "kvm", 3) &&
> > +                     strlen(header.id) < KVM_STATS_ID_MAXLEN,
> > +                     "Invalid KVM stats type");
> > +
> > +     /* Sanity check for other fields in header */
> > +     if (header.count == 0)
>
>
> Does this need a message as to why count is zero ?
>
Will add a warning message here.
> > +             return 0;
> > +     /* Check overlap */
> > +     TEST_ASSERT(header.desc_offset > 0 && header.data_offset > 0
> > +                     && header.desc_offset >= sizeof(header)
> > +                     && header.data_offset >= sizeof(header),
> > +                     "Invalid offset fields in header");
> > +     TEST_ASSERT(header.desc_offset > header.data_offset
> > +                     || (header.desc_offset + size_desc * header.count <=
> > +                             header.data_offset),
> > +                     "Descriptor block is overlapped with data block");
> > +
> > +     /* Allocate memory for stats descriptors */
> > +     stats_desc = calloc(header.count, size_desc);
> > +     TEST_ASSERT(stats_desc, "Allocate memory for stats descriptors");
> > +     /* Read kvm stats descriptors */
> > +     ret = pread(stats_fd, stats_desc,
> > +                     size_desc * header.count, header.desc_offset);
> > +     TEST_ASSERT(ret == size_desc * header.count,
> > +                     "Read KVM stats descriptors");
> > +
> > +     /* Sanity check for fields in descriptors */
> > +     for (i = 0; i < header.count; ++i) {
> > +             pdesc = (void *)stats_desc + i * size_desc;
> > +             /* Check type,unit,base boundaries */
> > +             TEST_ASSERT((pdesc->flags & KVM_STATS_TYPE_MASK)
> > +                             <= KVM_STATS_TYPE_MAX, "Unknown KVM stats type");
> > +             TEST_ASSERT((pdesc->flags & KVM_STATS_UNIT_MASK)
> > +                             <= KVM_STATS_UNIT_MAX, "Unknown KVM stats unit");
> > +             TEST_ASSERT((pdesc->flags & KVM_STATS_BASE_MASK)
> > +                             <= KVM_STATS_BASE_MAX, "Unknown KVM stats base");
> > +             /* Check exponent for stats unit
> > +              * Exponent for counter should be greater than or equal to 0
> > +              * Exponent for unit bytes should be greater than or equal to 0
> > +              * Exponent for unit seconds should be less than or equal to 0
> > +              * Exponent for unit clock cycles should be greater than or
> > +              * equal to 0
> > +              */
> > +             switch (pdesc->flags & KVM_STATS_UNIT_MASK) {
> > +             case KVM_STATS_UNIT_NONE:
> > +             case KVM_STATS_UNIT_BYTES:
> > +             case KVM_STATS_UNIT_CYCLES:
> > +                     TEST_ASSERT(pdesc->exponent >= 0,
> > +                                     "Unsupported KVM stats unit");
> > +                     break;
> > +             case KVM_STATS_UNIT_SECONDS:
> > +                     TEST_ASSERT(pdesc->exponent <= 0,
> > +                                     "Unsupported KVM stats unit");
> > +                     break;
> > +             }
> > +             /* Check name string */
> > +             TEST_ASSERT(strlen(pdesc->name) < header.name_size,
> > +                             "KVM stats name(%s) too long", pdesc->name);
> > +             /* Check size field, which should not be zero */
> > +             TEST_ASSERT(pdesc->size, "KVM descriptor(%s) with size of 0",
> > +                             pdesc->name);
> > +             size_data += pdesc->size * size_stat;
> > +     }
> > +     /* Check overlap */
> > +     TEST_ASSERT(header.data_offset >= header.desc_offset
> > +                     || header.data_offset + size_data <= header.desc_offset,
> > +                     "Data block is overlapped with Descriptor block");
> > +     /* Check validity of all stats data size */
> > +     TEST_ASSERT(size_data >= header.count * size_stat,
> > +                     "Data size is not correct");
> > +
> > +     /* Allocate memory for stats data */
> > +     stats_data = malloc(size_data);
> > +     TEST_ASSERT(stats_data, "Allocate memory for stats data");
> > +     /* Read kvm stats data as a bulk */
> > +     ret = pread(stats_fd, stats_data, size_data, header.data_offset);
> > +     TEST_ASSERT(ret == size_data, "Read KVM stats data");
> > +     /* Read kvm stats data one by one */
> > +     size_data = 0;
> > +     for (i = 0; i < header.count; ++i) {
> > +             pdesc = (void *)stats_desc + i * size_desc;
> > +             ret = pread(stats_fd, stats_data, pdesc->size * size_stat,
> > +                             header.data_offset + size_data);
> > +             TEST_ASSERT(ret == pdesc->size * size_stat,
> > +                             "Read data of KVM stats: %s", pdesc->name);
> > +             size_data += pdesc->size * size_stat;
> > +     }
> > +
> > +     free(stats_data);
> > +     free(stats_desc);
> > +     return 0;
> > +}
> > +
> > +
> > +int vm_stats_test(struct kvm_vm *vm)
> > +{
> > +     int stats_fd;
> > +     struct kvm_vm_stats_data *stats_data;
> > +
> > +     /* Get fd for VM stats */
> > +     stats_fd = vm_get_statsfd(vm);
> > +     TEST_ASSERT(stats_fd >= 0, "Get VM stats fd");
> > +
> > +     stats_test(stats_fd, sizeof(stats_data->value[0]));
> > +     close(stats_fd);
> > +
> > +     return 0;
> > +}
> > +
> > +int vcpu_stats_test(struct kvm_vm *vm, int vcpu_id)
> > +{
> > +     int stats_fd;
> > +     struct kvm_vcpu_stats_data *stats_data;
> > +
> > +     /* Get fd for VCPU stats */
> > +     stats_fd = vcpu_get_statsfd(vm, vcpu_id);
> > +     TEST_ASSERT(stats_fd >= 0, "Get VCPU stats fd");
> > +
> > +     stats_test(stats_fd, sizeof(stats_data->value[0]));
> > +     close(stats_fd);
> > +
> > +     return 0;
> > +}
> > +
> > +#define DEFAULT_NUM_VM               4
> > +#define DEFAULT_NUM_VCPU     4
> > +
> > +/*
> > + * Usage: kvm_bin_form_stats [#vm] [#vcpu]
> > + * The first parameter #vm set the number of VMs being created.
> > + * The second parameter #vcpu set the number of VCPUs being created.
> > + * By default, DEFAULT_NUM_VM VM and DEFAULT_NUM_VCPU VCPU for the VM would be
> > + * created for testing.
> > + */
> > +
> > +int main(int argc, char *argv[])
> > +{
> > +     int max_vm = DEFAULT_NUM_VM, max_vcpu = DEFAULT_NUM_VCPU, ret, i, j;
> > +     struct kvm_vm **vms;
> > +
> > +     /* Get the number of VMs and VCPUs that would be created for testing. */
> > +     if (argc > 1) {
> > +             max_vm = strtol(argv[1], NULL, 0);
> > +             if (max_vm <= 0)
> > +                     max_vm = DEFAULT_NUM_VM;
> > +     }
> > +     if (argc > 2) {
> > +             max_vcpu = strtol(argv[2], NULL, 0);
> > +             if (max_vcpu <= 0)
> > +                     max_vcpu = DEFAULT_NUM_VCPU;
> > +     }
> > +
> > +     /* Check the extension for binary stats */
> > +     ret = kvm_check_cap(KVM_CAP_STATS_BINARY_FD);
> > +     TEST_ASSERT(ret >= 0,
> > +                     "Binary form statistics interface is not supported");
> > +
> > +     /* Create VMs and VCPUs */
> > +     vms = malloc(sizeof(vms[0]) * max_vm);
> > +     TEST_ASSERT(vms, "Allocate memory for storing VM pointers");
> > +     for (i = 0; i < max_vm; ++i) {
> > +             vms[i] = vm_create(VM_MODE_DEFAULT,
> > +                             DEFAULT_GUEST_PHY_PAGES, O_RDWR);
> > +             for (j = 0; j < max_vcpu; ++j)
> > +                     vm_vcpu_add(vms[i], j);
> > +     }
> > +
> > +     /* Check stats read for every VM and VCPU */
> > +     for (i = 0; i < max_vm; ++i) {
> > +             vm_stats_test(vms[i]);
> > +             for (j = 0; j < max_vcpu; ++j)
> > +                     vcpu_stats_test(vms[i], j);
> > +     }
> > +
>
>
> Does it make sense to add one more test case here to test this fd
> interface on a VM or on a VCPU that has been deleted ? For example, how
> does this fd interface behave if we delete the 4th VM and the 4th VCPU
> in the 3rd VM ?
>
If you meant to test the behavior when we are trying to access a
invalid fd which belongs
to a VM or VCPU that doesn't exist, that's a good idea. I will add a
test for that. thanks.
> > +     for (i = 0; i < max_vm; ++i)
> > +             kvm_vm_free(vms[i]);
> > +     free(vms);
> > +     return 0;
> > +}
> > diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
> > index fc83f6c5902d..d9e0b2c8b906 100644
> > --- a/tools/testing/selftests/kvm/lib/kvm_util.c
> > +++ b/tools/testing/selftests/kvm/lib/kvm_util.c
> > @@ -2090,3 +2090,15 @@ unsigned int vm_calc_num_guest_pages(enum vm_guest_mode mode, size_t size)
> >       n = DIV_ROUND_UP(size, vm_guest_mode_params[mode].page_size);
> >       return vm_adjust_num_guest_pages(mode, n);
> >   }
> > +
> > +int vm_get_statsfd(struct kvm_vm *vm)
> > +{
> > +     return ioctl(vm->fd, KVM_STATS_GETFD, NULL);
> > +}
> > +
> > +int vcpu_get_statsfd(struct kvm_vm *vm, uint32_t vcpuid)
> > +{
> > +     struct vcpu *vcpu = vcpu_find(vm, vcpuid);
> > +
> > +     return ioctl(vcpu->fd, KVM_STATS_GETFD, NULL);
> > +}
>
>
> Do we need separate functions if they are called just once ?  Or perhaps
> have a single function for the ioctl call, like ?
>
>       int get_stats_fd(int fd, int type)
>
>       {
>
>              return ioctl(fd, type, NULL);
>
>       }
>
I guess two separate functions are more clear, one function does one thing.

Thanks,
Jing
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Re: [PATCH v6 2/4] KVM: stats: Add fd-based API to read binary stats data

[kernel test robot]

[-- Attachment #1: Type: text/plain, Size: 16203 bytes --]

CC: kbuild-all(a)lists.01.org
In-Reply-To: <20210524151828.4113777-3-jingzhangos@google.com>
References: <20210524151828.4113777-3-jingzhangos@google.com>
TO: Jing Zhang <jingzhangos@google.com>
TO: KVM <kvm@vger.kernel.org>
TO: KVMARM <kvmarm@lists.cs.columbia.edu>
TO: LinuxMIPS <linux-mips@vger.kernel.org>
TO: KVMPPC <kvm-ppc@vger.kernel.org>
TO: LinuxS390 <linux-s390@vger.kernel.org>
TO: Linuxkselftest <linux-kselftest@vger.kernel.org>
TO: Paolo Bonzini <pbonzini@redhat.com>
TO: Marc Zyngier <maz@kernel.org>
TO: James Morse <james.morse@arm.com>
TO: Julien Thierry <julien.thierry.kdev@gmail.com>

Hi Jing,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on a4345a7cecfb91ae78cd43d26b0c6a956420761a]

url:    https://github.com/0day-ci/linux/commits/Jing-Zhang/KVM-statistics-data-fd-based-binary-interface/20210525-001341
base:   a4345a7cecfb91ae78cd43d26b0c6a956420761a
:::::: branch date: 67 minutes ago
:::::: commit date: 67 minutes ago
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce:
cd tools/perf && ./check-headers.sh

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>


perfheadercheck warnings: (new ones prefixed by >>)
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1081> #define KVM_CAP_SET_GUEST_DEBUG2 195
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1082> #define KVM_CAP_SGX_ATTRIBUTE 196
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1083> #define KVM_CAP_VM_COPY_ENC_CONTEXT_FROM 197
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1084> #define KVM_CAP_PTP_KVM 198
>> Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1085> #define KVM_CAP_STATS_BINARY_FD 199
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1679> 	/* Guest Migration Extension */
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1680> 	KVM_SEV_SEND_CANCEL,
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1739> struct kvm_sev_send_start {
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1740> 	__u32 policy;
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1741> 	__u64 pdh_cert_uaddr;
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1742> 	__u32 pdh_cert_len;
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1743> 	__u64 plat_certs_uaddr;
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1744> 	__u32 plat_certs_len;
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1745> 	__u64 amd_certs_uaddr;
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1746> 	__u32 amd_certs_len;
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1747> 	__u64 session_uaddr;
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1748> 	__u32 session_len;
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1749> };
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1750> 
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1751> struct kvm_sev_send_update_data {
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1752> 	__u64 hdr_uaddr;
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1753> 	__u32 hdr_len;
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1754> 	__u64 guest_uaddr;
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1755> 	__u32 guest_len;
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1756> 	__u64 trans_uaddr;
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1757> 	__u32 trans_len;
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1758> };
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1759> 
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1760> struct kvm_sev_receive_start {
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1761> 	__u32 handle;
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1762> 	__u32 policy;
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1763> 	__u64 pdh_uaddr;
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1764> 	__u32 pdh_len;
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1765> 	__u64 session_uaddr;
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1766> 	__u32 session_len;
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1767> };
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1768> 
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1769> struct kvm_sev_receive_update_data {
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1770> 	__u64 hdr_uaddr;
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1771> 	__u32 hdr_len;
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1772> 	__u64 guest_uaddr;
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1773> 	__u32 guest_len;
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1774> 	__u64 trans_uaddr;
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1775> 	__u32 trans_len;
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1776> };
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1777> 
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1901> 
>> Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1902> #define KVM_STATS_ID_MAXLEN		64
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1903> 
>> Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1904> struct kvm_stats_header {
>> Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1905> 	char id[KVM_STATS_ID_MAXLEN];
>> Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1906> 	__u32 name_size;
>> Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1907> 	__u32 count;
>> Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1908> 	__u32 desc_offset;
>> Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1909> 	__u32 data_offset;
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1910> };
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1911> 
>> Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1912> #define KVM_STATS_TYPE_SHIFT		0
>> Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1913> #define KVM_STATS_TYPE_MASK		(0xF << KVM_STATS_TYPE_SHIFT)
>> Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1914> #define KVM_STATS_TYPE_CUMULATIVE	(0x0 << KVM_STATS_TYPE_SHIFT)
>> Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1915> #define KVM_STATS_TYPE_INSTANT		(0x1 << KVM_STATS_TYPE_SHIFT)
>> Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1916> #define KVM_STATS_TYPE_MAX		KVM_STATS_TYPE_INSTANT
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1917> 
>> Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1918> #define KVM_STATS_UNIT_SHIFT		4
>> Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1919> #define KVM_STATS_UNIT_MASK		(0xF << KVM_STATS_UNIT_SHIFT)
>> Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1920> #define KVM_STATS_UNIT_NONE		(0x0 << KVM_STATS_UNIT_SHIFT)
>> Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1921> #define KVM_STATS_UNIT_BYTES		(0x1 << KVM_STATS_UNIT_SHIFT)
>> Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1922> #define KVM_STATS_UNIT_SECONDS		(0x2 << KVM_STATS_UNIT_SHIFT)
>> Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1923> #define KVM_STATS_UNIT_CYCLES		(0x3 << KVM_STATS_UNIT_SHIFT)
>> Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1924> #define KVM_STATS_UNIT_MAX		KVM_STATS_UNIT_CYCLES
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1925> 
>> Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1926> #define KVM_STATS_BASE_SHIFT		8
>> Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1927> #define KVM_STATS_BASE_MASK		(0xF << KVM_STATS_BASE_SHIFT)
>> Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1928> #define KVM_STATS_BASE_POW10		(0x0 << KVM_STATS_BASE_SHIFT)
>> Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1929> #define KVM_STATS_BASE_POW2		(0x1 << KVM_STATS_BASE_SHIFT)
>> Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1930> #define KVM_STATS_BASE_MAX		KVM_STATS_BASE_POW2
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1931> 
>> Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1932> struct kvm_stats_desc {
>> Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1933> 	__u32 flags;
>> Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1934> 	__s16 exponent;
>> Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1935> 	__u16 size;
>> Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1936> 	__u32 unused1;
>> Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1937> 	__u32 unused2;
>> Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1938> 	char name[0];
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1939> };
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1940> 
>> Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1941> struct kvm_vm_stats_data {
>> Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1942> 	unsigned long value[0];
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1943> };
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1944> 
>> Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1945> struct kvm_vcpu_stats_data {
>> Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1946> 	__u64 value[0];
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1947> };
   Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1948> 
>> Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h': 1949> #define KVM_STATS_GETFD  _IOR(KVMIO,  0xcc, struct kvm_stats_header)

---
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