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

[Jing Zhang <jingzhangos@google.com>]

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