[GIT PULL 00/18] KVM: s390x: KVM s390x changes for 6.3

[GIT PULL 00/18] KVM: s390x: KVM s390x changes for 6.3

[Janosch Frank]

Hi Paolo,

the following changes are ready for pulling for 6.3:
* Two more V!=R patches
* The last part of the cmpxchg patches
* A few fixes

This pull includes the s390 cmpxchg_user_key feature branch which is
the base for the KVM cmpxchg patches by Janis.

Cheers,
Janosch

The following changes since commit a2ce98d69fabc7d3758063366fe830f682610cf7:

  Merge remote-tracking branch 'l390-korg/cmpxchg_user_key' into kvm-next (2023-02-07 18:04:23 +0100)

are available in the Git repository at:

  https://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux.git tags/kvm-s390-next-6.3-1

for you to fetch changes up to 5fc5b94a273655128159186c87662105db8afeb5:

  s390/virtio: sort out physical vs virtual pointers usage (2023-02-08 09:59:46 +0100)

----------------------------------------------------------------

Alexander Gordeev (1):
  s390/virtio: sort out physical vs virtual pointers usage

Janis Schoetterl-Glausch (14):
  KVM: s390: selftest: memop: Pass mop_desc via pointer
  KVM: s390: selftest: memop: Replace macros by functions
  KVM: s390: selftest: memop: Move testlist into main
  KVM: s390: selftest: memop: Add bad address test
  KVM: s390: selftest: memop: Fix typo
  KVM: s390: selftest: memop: Fix wrong address being used in test
  KVM: s390: selftest: memop: Fix integer literal
  KVM: s390: Move common code of mem_op functions into function
  KVM: s390: Dispatch to implementing function at top level of vm mem_op
  KVM: s390: Refactor absolute vm mem_op function
  KVM: s390: Refactor vcpu mem_op function
  KVM: s390: Extend MEM_OP ioctl by storage key checked cmpxchg
  Documentation: KVM: s390: Describe KVM_S390_MEMOP_F_CMPXCHG
  KVM: s390: selftest: memop: Add cmpxchg tests

Nico Boehr (2):
  KVM: s390: disable migration mode when dirty tracking is disabled
  KVM: s390: GISA: sort out physical vs virtual pointers usage

Nina Schoetterl-Glausch (1):
  KVM: selftests: Compile s390 tests with -march=z10

 Documentation/virt/kvm/api.rst            |  46 +-
 Documentation/virt/kvm/devices/vm.rst     |   4 +
 arch/s390/kvm/gaccess.c                   | 109 ++++
 arch/s390/kvm/gaccess.h                   |   3 +
 arch/s390/kvm/interrupt.c                 |  11 +-
 arch/s390/kvm/kvm-s390.c                  | 268 +++++----
 drivers/s390/virtio/virtio_ccw.c          |  46 +-
 include/uapi/linux/kvm.h                  |   8 +
 tools/testing/selftests/kvm/Makefile      |   3 +
 tools/testing/selftests/kvm/s390x/memop.c | 676 +++++++++++++++++-----
 10 files changed, 889 insertions(+), 285 deletions(-)

-- 
2.39.1

[GIT PULL 01/18] KVM: s390: disable migration mode when dirty tracking is disabled

[Janosch Frank]

From: Nico Boehr <nrb@linux.ibm.com>

Migration mode is a VM attribute which enables tracking of changes in
storage attributes (PGSTE). It assumes dirty tracking is enabled on all
memslots to keep a dirty bitmap of pages with changed storage attributes.

When enabling migration mode, we currently check that dirty tracking is
enabled for all memslots. However, userspace can disable dirty tracking
without disabling migration mode.

Since migration mode is pointless with dirty tracking disabled, disable
migration mode whenever userspace disables dirty tracking on any slot.

Also update the documentation to clarify that dirty tracking must be
enabled when enabling migration mode, which is already enforced by the
code in kvm_s390_vm_start_migration().

Also highlight in the documentation for KVM_S390_GET_CMMA_BITS that it
can now fail with -EINVAL when dirty tracking is disabled while
migration mode is on. Move all the error codes to a table so this stays
readable.

To disable migration mode, slots_lock should be held, which is taken
in kvm_set_memory_region() and thus held in
kvm_arch_prepare_memory_region().

Restructure the prepare code a bit so all the sanity checking is done
before disabling migration mode. This ensures migration mode isn't
disabled when some sanity check fails.

Cc: stable@vger.kernel.org
Fixes: 190df4a212a7 ("KVM: s390: CMMA tracking, ESSA emulation, migration mode")
Signed-off-by: Nico Boehr <nrb@linux.ibm.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Link: https://lore.kernel.org/r/20230127140532.230651-2-nrb@linux.ibm.com
Message-Id: <20230127140532.230651-2-nrb@linux.ibm.com>
[frankja@linux.ibm.com: fixed commit message typo, moved api.rst error table upwards]
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
---
 Documentation/virt/kvm/api.rst        | 18 ++++++----
 Documentation/virt/kvm/devices/vm.rst |  4 +++
 arch/s390/kvm/kvm-s390.c              | 47 ++++++++++++++++++---------
 3 files changed, 48 insertions(+), 21 deletions(-)

diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
index deb494f759ed..8cd7fd05d53b 100644
--- a/Documentation/virt/kvm/api.rst
+++ b/Documentation/virt/kvm/api.rst
@@ -4449,6 +4449,18 @@ not holding a previously reported uncorrected error).
 :Parameters: struct kvm_s390_cmma_log (in, out)
 :Returns: 0 on success, a negative value on error
 
+Errors:
+
+  ======     =============================================================
+  ENOMEM     not enough memory can be allocated to complete the task
+  ENXIO      if CMMA is not enabled
+  EINVAL     if KVM_S390_CMMA_PEEK is not set but migration mode was not enabled
+  EINVAL     if KVM_S390_CMMA_PEEK is not set but dirty tracking has been
+             disabled (and thus migration mode was automatically disabled)
+  EFAULT     if the userspace address is invalid or if no page table is
+             present for the addresses (e.g. when using hugepages).
+  ======     =============================================================
+
 This ioctl is used to get the values of the CMMA bits on the s390
 architecture. It is meant to be used in two scenarios:
 
@@ -4529,12 +4541,6 @@ mask is unused.
 
 values points to the userspace buffer where the result will be stored.
 
-This ioctl can fail with -ENOMEM if not enough memory can be allocated to
-complete the task, with -ENXIO if CMMA is not enabled, with -EINVAL if
-KVM_S390_CMMA_PEEK is not set but migration mode was not enabled, with
--EFAULT if the userspace address is invalid or if no page table is
-present for the addresses (e.g. when using hugepages).
-
 4.108 KVM_S390_SET_CMMA_BITS
 ----------------------------
 
diff --git a/Documentation/virt/kvm/devices/vm.rst b/Documentation/virt/kvm/devices/vm.rst
index 60acc39e0e93..147efec626e5 100644
--- a/Documentation/virt/kvm/devices/vm.rst
+++ b/Documentation/virt/kvm/devices/vm.rst
@@ -302,6 +302,10 @@ Allows userspace to start migration mode, needed for PGSTE migration.
 Setting this attribute when migration mode is already active will have
 no effects.
 
+Dirty tracking must be enabled on all memslots, else -EINVAL is returned. When
+dirty tracking is disabled on any memslot, migration mode is automatically
+stopped.
+
 :Parameters: none
 :Returns:   -ENOMEM if there is not enough free memory to start migration mode;
 	    -EINVAL if the state of the VM is invalid (e.g. no memory defined);
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index e4890e04b210..cb72f9a09fb3 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -5633,23 +5633,40 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm,
 	if (kvm_s390_pv_get_handle(kvm))
 		return -EINVAL;
 
-	if (change == KVM_MR_DELETE || change == KVM_MR_FLAGS_ONLY)
+	if (change != KVM_MR_DELETE && change != KVM_MR_FLAGS_ONLY) {
+		/*
+		 * A few sanity checks. We can have memory slots which have to be
+		 * located/ended at a segment boundary (1MB). The memory in userland is
+		 * ok to be fragmented into various different vmas. It is okay to mmap()
+		 * and munmap() stuff in this slot after doing this call at any time
+		 */
+
+		if (new->userspace_addr & 0xffffful)
+			return -EINVAL;
+
+		size = new->npages * PAGE_SIZE;
+		if (size & 0xffffful)
+			return -EINVAL;
+
+		if ((new->base_gfn * PAGE_SIZE) + size > kvm->arch.mem_limit)
+			return -EINVAL;
+	}
+
+	if (!kvm->arch.migration_mode)
 		return 0;
 
-	/* A few sanity checks. We can have memory slots which have to be
-	   located/ended at a segment boundary (1MB). The memory in userland is
-	   ok to be fragmented into various different vmas. It is okay to mmap()
-	   and munmap() stuff in this slot after doing this call at any time */
-
-	if (new->userspace_addr & 0xffffful)
-		return -EINVAL;
-
-	size = new->npages * PAGE_SIZE;
-	if (size & 0xffffful)
-		return -EINVAL;
-
-	if ((new->base_gfn * PAGE_SIZE) + size > kvm->arch.mem_limit)
-		return -EINVAL;
+	/*
+	 * Turn off migration mode when:
+	 * - userspace creates a new memslot with dirty logging off,
+	 * - userspace modifies an existing memslot (MOVE or FLAGS_ONLY) and
+	 *   dirty logging is turned off.
+	 * Migration mode expects dirty page logging being enabled to store
+	 * its dirty bitmap.
+	 */
+	if (change != KVM_MR_DELETE &&
+	    !(new->flags & KVM_MEM_LOG_DIRTY_PAGES))
+		WARN(kvm_s390_vm_stop_migration(kvm),
+		     "Failed to stop migration mode");
 
 	return 0;
 }
-- 
2.39.1

[GIT PULL 02/18] KVM: selftests: Compile s390 tests with -march=z10

[Janosch Frank]

From: Nina Schoetterl-Glausch <nsg@linux.ibm.com>

The guest used in s390 kvm selftests is not be set up to handle all
instructions the compiler might emit, i.e. vector instructions, leading
to crashes.
Limit what the compiler emits to the oldest machine model currently
supported by Linux.

Signed-off-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Link: https://lore.kernel.org/r/20230127174552.3370169-1-nsg@linux.ibm.com
Message-Id: <20230127174552.3370169-1-nsg@linux.ibm.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
---
 tools/testing/selftests/kvm/Makefile | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
index 1750f91dd936..df0989949eb5 100644
--- a/tools/testing/selftests/kvm/Makefile
+++ b/tools/testing/selftests/kvm/Makefile
@@ -200,6 +200,9 @@ CFLAGS += -Wall -Wstrict-prototypes -Wuninitialized -O2 -g -std=gnu99 \
 	-I$(LINUX_TOOL_ARCH_INCLUDE) -I$(LINUX_HDR_PATH) -Iinclude \
 	-I$(<D) -Iinclude/$(ARCH_DIR) -I ../rseq -I.. $(EXTRA_CFLAGS) \
 	$(KHDR_INCLUDES)
+ifeq ($(ARCH),s390)
+	CFLAGS += -march=z10
+endif
 
 no-pie-option := $(call try-run, echo 'int main(void) { return 0; }' | \
         $(CC) -Werror $(CFLAGS) -no-pie -x c - -o "$$TMP", -no-pie)
-- 
2.39.1

[GIT PULL 03/18] KVM: s390: selftest: memop: Pass mop_desc via pointer

[Janosch Frank]

From: Janis Schoetterl-Glausch <scgl@linux.ibm.com>

The struct is quite large, so this seems nicer.

Signed-off-by: Janis Schoetterl-Glausch <scgl@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Link: https://lore.kernel.org/r/20230206164602.138068-2-scgl@linux.ibm.com
Message-Id: <20230206164602.138068-2-scgl@linux.ibm.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
---
 tools/testing/selftests/kvm/s390x/memop.c | 44 +++++++++++------------
 1 file changed, 22 insertions(+), 22 deletions(-)

diff --git a/tools/testing/selftests/kvm/s390x/memop.c b/tools/testing/selftests/kvm/s390x/memop.c
index 3fd81e58f40c..9c05d1205114 100644
--- a/tools/testing/selftests/kvm/s390x/memop.c
+++ b/tools/testing/selftests/kvm/s390x/memop.c
@@ -48,53 +48,53 @@ struct mop_desc {
 	uint8_t key;
 };
 
-static struct kvm_s390_mem_op ksmo_from_desc(struct mop_desc desc)
+static struct kvm_s390_mem_op ksmo_from_desc(const struct mop_desc *desc)
 {
 	struct kvm_s390_mem_op ksmo = {
-		.gaddr = (uintptr_t)desc.gaddr,
-		.size = desc.size,
-		.buf = ((uintptr_t)desc.buf),
+		.gaddr = (uintptr_t)desc->gaddr,
+		.size = desc->size,
+		.buf = ((uintptr_t)desc->buf),
 		.reserved = "ignored_ignored_ignored_ignored"
 	};
 
-	switch (desc.target) {
+	switch (desc->target) {
 	case LOGICAL:
-		if (desc.mode == READ)
+		if (desc->mode == READ)
 			ksmo.op = KVM_S390_MEMOP_LOGICAL_READ;
-		if (desc.mode == WRITE)
+		if (desc->mode == WRITE)
 			ksmo.op = KVM_S390_MEMOP_LOGICAL_WRITE;
 		break;
 	case SIDA:
-		if (desc.mode == READ)
+		if (desc->mode == READ)
 			ksmo.op = KVM_S390_MEMOP_SIDA_READ;
-		if (desc.mode == WRITE)
+		if (desc->mode == WRITE)
 			ksmo.op = KVM_S390_MEMOP_SIDA_WRITE;
 		break;
 	case ABSOLUTE:
-		if (desc.mode == READ)
+		if (desc->mode == READ)
 			ksmo.op = KVM_S390_MEMOP_ABSOLUTE_READ;
-		if (desc.mode == WRITE)
+		if (desc->mode == WRITE)
 			ksmo.op = KVM_S390_MEMOP_ABSOLUTE_WRITE;
 		break;
 	case INVALID:
 		ksmo.op = -1;
 	}
-	if (desc.f_check)
+	if (desc->f_check)
 		ksmo.flags |= KVM_S390_MEMOP_F_CHECK_ONLY;
-	if (desc.f_inject)
+	if (desc->f_inject)
 		ksmo.flags |= KVM_S390_MEMOP_F_INJECT_EXCEPTION;
-	if (desc._set_flags)
-		ksmo.flags = desc.set_flags;
-	if (desc.f_key) {
+	if (desc->_set_flags)
+		ksmo.flags = desc->set_flags;
+	if (desc->f_key) {
 		ksmo.flags |= KVM_S390_MEMOP_F_SKEY_PROTECTION;
-		ksmo.key = desc.key;
+		ksmo.key = desc->key;
 	}
-	if (desc._ar)
-		ksmo.ar = desc.ar;
+	if (desc->_ar)
+		ksmo.ar = desc->ar;
 	else
 		ksmo.ar = 0;
-	if (desc._sida_offset)
-		ksmo.sida_offset = desc.sida_offset;
+	if (desc->_sida_offset)
+		ksmo.sida_offset = desc->sida_offset;
 
 	return ksmo;
 }
@@ -183,7 +183,7 @@ static int err_memop_ioctl(struct test_info info, struct kvm_s390_mem_op *ksmo)
 		else								\
 			__desc.gaddr = __desc.gaddr_v;				\
 	}									\
-	__ksmo = ksmo_from_desc(__desc);					\
+	__ksmo = ksmo_from_desc(&__desc);					\
 	print_memop(__info.vcpu, &__ksmo);					\
 	err##memop_ioctl(__info, &__ksmo);					\
 })
-- 
2.39.1

[GIT PULL 04/18] KVM: s390: selftest: memop: Replace macros by functions

[Janosch Frank]

From: Janis Schoetterl-Glausch <scgl@linux.ibm.com>

Replace the DEFAULT_* test helpers by functions, as they don't
need the extra flexibility.

Signed-off-by: Janis Schoetterl-Glausch <scgl@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Acked-by: Janosch Frank <frankja@linux.ibm.com>
Link: https://lore.kernel.org/r/20230206164602.138068-3-scgl@linux.ibm.com
Message-Id: <20230206164602.138068-3-scgl@linux.ibm.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
---
 tools/testing/selftests/kvm/s390x/memop.c | 82 +++++++++++------------
 1 file changed, 39 insertions(+), 43 deletions(-)

diff --git a/tools/testing/selftests/kvm/s390x/memop.c b/tools/testing/selftests/kvm/s390x/memop.c
index 9c05d1205114..df1c726294b2 100644
--- a/tools/testing/selftests/kvm/s390x/memop.c
+++ b/tools/testing/selftests/kvm/s390x/memop.c
@@ -48,6 +48,8 @@ struct mop_desc {
 	uint8_t key;
 };
 
+const uint8_t NO_KEY = 0xff;
+
 static struct kvm_s390_mem_op ksmo_from_desc(const struct mop_desc *desc)
 {
 	struct kvm_s390_mem_op ksmo = {
@@ -85,7 +87,7 @@ static struct kvm_s390_mem_op ksmo_from_desc(const struct mop_desc *desc)
 		ksmo.flags |= KVM_S390_MEMOP_F_INJECT_EXCEPTION;
 	if (desc->_set_flags)
 		ksmo.flags = desc->set_flags;
-	if (desc->f_key) {
+	if (desc->f_key && desc->key != NO_KEY) {
 		ksmo.flags |= KVM_S390_MEMOP_F_SKEY_PROTECTION;
 		ksmo.key = desc->key;
 	}
@@ -268,34 +270,28 @@ static void prepare_mem12(void)
 #define ASSERT_MEM_EQ(p1, p2, size) \
 	TEST_ASSERT(!memcmp(p1, p2, size), "Memory contents do not match!")
 
-#define DEFAULT_WRITE_READ(copy_cpu, mop_cpu, mop_target_p, size, ...)		\
-({										\
-	struct test_info __copy_cpu = (copy_cpu), __mop_cpu = (mop_cpu);	\
-	enum mop_target __target = (mop_target_p);				\
-	uint32_t __size = (size);						\
-										\
-	prepare_mem12();							\
-	CHECK_N_DO(MOP, __mop_cpu, __target, WRITE, mem1, __size,		\
-			GADDR_V(mem1), ##__VA_ARGS__);				\
-	HOST_SYNC(__copy_cpu, STAGE_COPIED);					\
-	CHECK_N_DO(MOP, __mop_cpu, __target, READ, mem2, __size,		\
-			GADDR_V(mem2), ##__VA_ARGS__);				\
-	ASSERT_MEM_EQ(mem1, mem2, __size);					\
-})
+static void default_write_read(struct test_info copy_cpu, struct test_info mop_cpu,
+			       enum mop_target mop_target, uint32_t size, uint8_t key)
+{
+	prepare_mem12();
+	CHECK_N_DO(MOP, mop_cpu, mop_target, WRITE, mem1, size,
+		   GADDR_V(mem1), KEY(key));
+	HOST_SYNC(copy_cpu, STAGE_COPIED);
+	CHECK_N_DO(MOP, mop_cpu, mop_target, READ, mem2, size,
+		   GADDR_V(mem2), KEY(key));
+	ASSERT_MEM_EQ(mem1, mem2, size);
+}
 
-#define DEFAULT_READ(copy_cpu, mop_cpu, mop_target_p, size, ...)		\
-({										\
-	struct test_info __copy_cpu = (copy_cpu), __mop_cpu = (mop_cpu);	\
-	enum mop_target __target = (mop_target_p);				\
-	uint32_t __size = (size);						\
-										\
-	prepare_mem12();							\
-	CHECK_N_DO(MOP, __mop_cpu, __target, WRITE, mem1, __size,		\
-			GADDR_V(mem1));						\
-	HOST_SYNC(__copy_cpu, STAGE_COPIED);					\
-	CHECK_N_DO(MOP, __mop_cpu, __target, READ, mem2, __size, ##__VA_ARGS__);\
-	ASSERT_MEM_EQ(mem1, mem2, __size);					\
-})
+static void default_read(struct test_info copy_cpu, struct test_info mop_cpu,
+			 enum mop_target mop_target, uint32_t size, uint8_t key)
+{
+	prepare_mem12();
+	CHECK_N_DO(MOP, mop_cpu, mop_target, WRITE, mem1, size, GADDR_V(mem1));
+	HOST_SYNC(copy_cpu, STAGE_COPIED);
+	CHECK_N_DO(MOP, mop_cpu, mop_target, READ, mem2, size,
+		   GADDR_V(mem2), KEY(key));
+	ASSERT_MEM_EQ(mem1, mem2, size);
+}
 
 static void guest_copy(void)
 {
@@ -310,7 +306,7 @@ static void test_copy(void)
 
 	HOST_SYNC(t.vcpu, STAGE_INITED);
 
-	DEFAULT_WRITE_READ(t.vcpu, t.vcpu, LOGICAL, t.size);
+	default_write_read(t.vcpu, t.vcpu, LOGICAL, t.size, NO_KEY);
 
 	kvm_vm_free(t.kvm_vm);
 }
@@ -357,26 +353,26 @@ static void test_copy_key(void)
 	HOST_SYNC(t.vcpu, STAGE_SKEYS_SET);
 
 	/* vm, no key */
-	DEFAULT_WRITE_READ(t.vcpu, t.vm, ABSOLUTE, t.size);
+	default_write_read(t.vcpu, t.vm, ABSOLUTE, t.size, NO_KEY);
 
 	/* vm/vcpu, machting key or key 0 */
-	DEFAULT_WRITE_READ(t.vcpu, t.vcpu, LOGICAL, t.size, KEY(0));
-	DEFAULT_WRITE_READ(t.vcpu, t.vcpu, LOGICAL, t.size, KEY(9));
-	DEFAULT_WRITE_READ(t.vcpu, t.vm, ABSOLUTE, t.size, KEY(0));
-	DEFAULT_WRITE_READ(t.vcpu, t.vm, ABSOLUTE, t.size, KEY(9));
+	default_write_read(t.vcpu, t.vcpu, LOGICAL, t.size, 0);
+	default_write_read(t.vcpu, t.vcpu, LOGICAL, t.size, 9);
+	default_write_read(t.vcpu, t.vm, ABSOLUTE, t.size, 0);
+	default_write_read(t.vcpu, t.vm, ABSOLUTE, t.size, 9);
 	/*
 	 * There used to be different code paths for key handling depending on
 	 * if the region crossed a page boundary.
 	 * There currently are not, but the more tests the merrier.
 	 */
-	DEFAULT_WRITE_READ(t.vcpu, t.vcpu, LOGICAL, 1, KEY(0));
-	DEFAULT_WRITE_READ(t.vcpu, t.vcpu, LOGICAL, 1, KEY(9));
-	DEFAULT_WRITE_READ(t.vcpu, t.vm, ABSOLUTE, 1, KEY(0));
-	DEFAULT_WRITE_READ(t.vcpu, t.vm, ABSOLUTE, 1, KEY(9));
+	default_write_read(t.vcpu, t.vcpu, LOGICAL, 1, 0);
+	default_write_read(t.vcpu, t.vcpu, LOGICAL, 1, 9);
+	default_write_read(t.vcpu, t.vm, ABSOLUTE, 1, 0);
+	default_write_read(t.vcpu, t.vm, ABSOLUTE, 1, 9);
 
 	/* vm/vcpu, mismatching keys on read, but no fetch protection */
-	DEFAULT_READ(t.vcpu, t.vcpu, LOGICAL, t.size, GADDR_V(mem2), KEY(2));
-	DEFAULT_READ(t.vcpu, t.vm, ABSOLUTE, t.size, GADDR_V(mem1), KEY(2));
+	default_read(t.vcpu, t.vcpu, LOGICAL, t.size, 2);
+	default_read(t.vcpu, t.vm, ABSOLUTE, t.size, 2);
 
 	kvm_vm_free(t.kvm_vm);
 }
@@ -409,7 +405,7 @@ static void test_copy_key_storage_prot_override(void)
 	HOST_SYNC(t.vcpu, STAGE_SKEYS_SET);
 
 	/* vcpu, mismatching keys, storage protection override in effect */
-	DEFAULT_WRITE_READ(t.vcpu, t.vcpu, LOGICAL, t.size, KEY(2));
+	default_write_read(t.vcpu, t.vcpu, LOGICAL, t.size, 2);
 
 	kvm_vm_free(t.kvm_vm);
 }
@@ -422,8 +418,8 @@ static void test_copy_key_fetch_prot(void)
 	HOST_SYNC(t.vcpu, STAGE_SKEYS_SET);
 
 	/* vm/vcpu, matching key, fetch protection in effect */
-	DEFAULT_READ(t.vcpu, t.vcpu, LOGICAL, t.size, GADDR_V(mem2), KEY(9));
-	DEFAULT_READ(t.vcpu, t.vm, ABSOLUTE, t.size, GADDR_V(mem2), KEY(9));
+	default_read(t.vcpu, t.vcpu, LOGICAL, t.size, 9);
+	default_read(t.vcpu, t.vm, ABSOLUTE, t.size, 9);
 
 	kvm_vm_free(t.kvm_vm);
 }
-- 
2.39.1

[GIT PULL 05/18] KVM: s390: selftest: memop: Move testlist into main

[Janosch Frank]

From: Janis Schoetterl-Glausch <scgl@linux.ibm.com>

This allows checking if the necessary requirements for a test case are
met via an arbitrary expression. In particular, it is easy to check if
certain bits are set in the memop extension capability.

Signed-off-by: Janis Schoetterl-Glausch <scgl@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Link: https://lore.kernel.org/r/20230206164602.138068-4-scgl@linux.ibm.com
Message-Id: <20230206164602.138068-4-scgl@linux.ibm.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
---
 tools/testing/selftests/kvm/s390x/memop.c | 131 +++++++++++-----------
 1 file changed, 66 insertions(+), 65 deletions(-)

diff --git a/tools/testing/selftests/kvm/s390x/memop.c b/tools/testing/selftests/kvm/s390x/memop.c
index df1c726294b2..bbc191a13760 100644
--- a/tools/testing/selftests/kvm/s390x/memop.c
+++ b/tools/testing/selftests/kvm/s390x/memop.c
@@ -690,85 +690,86 @@ static void test_errors(void)
 	kvm_vm_free(t.kvm_vm);
 }
 
-struct testdef {
-	const char *name;
-	void (*test)(void);
-	int extension;
-} testlist[] = {
-	{
-		.name = "simple copy",
-		.test = test_copy,
-	},
-	{
-		.name = "generic error checks",
-		.test = test_errors,
-	},
-	{
-		.name = "copy with storage keys",
-		.test = test_copy_key,
-		.extension = 1,
-	},
-	{
-		.name = "copy with key storage protection override",
-		.test = test_copy_key_storage_prot_override,
-		.extension = 1,
-	},
-	{
-		.name = "copy with key fetch protection",
-		.test = test_copy_key_fetch_prot,
-		.extension = 1,
-	},
-	{
-		.name = "copy with key fetch protection override",
-		.test = test_copy_key_fetch_prot_override,
-		.extension = 1,
-	},
-	{
-		.name = "error checks with key",
-		.test = test_errors_key,
-		.extension = 1,
-	},
-	{
-		.name = "termination",
-		.test = test_termination,
-		.extension = 1,
-	},
-	{
-		.name = "error checks with key storage protection override",
-		.test = test_errors_key_storage_prot_override,
-		.extension = 1,
-	},
-	{
-		.name = "error checks without key fetch prot override",
-		.test = test_errors_key_fetch_prot_override_not_enabled,
-		.extension = 1,
-	},
-	{
-		.name = "error checks with key fetch prot override",
-		.test = test_errors_key_fetch_prot_override_enabled,
-		.extension = 1,
-	},
-};
 
 int main(int argc, char *argv[])
 {
 	int extension_cap, idx;
 
 	TEST_REQUIRE(kvm_has_cap(KVM_CAP_S390_MEM_OP));
+	extension_cap = kvm_check_cap(KVM_CAP_S390_MEM_OP_EXTENSION);
+
+	struct testdef {
+		const char *name;
+		void (*test)(void);
+		bool requirements_met;
+	} testlist[] = {
+		{
+			.name = "simple copy",
+			.test = test_copy,
+			.requirements_met = true,
+		},
+		{
+			.name = "generic error checks",
+			.test = test_errors,
+			.requirements_met = true,
+		},
+		{
+			.name = "copy with storage keys",
+			.test = test_copy_key,
+			.requirements_met = extension_cap > 0,
+		},
+		{
+			.name = "copy with key storage protection override",
+			.test = test_copy_key_storage_prot_override,
+			.requirements_met = extension_cap > 0,
+		},
+		{
+			.name = "copy with key fetch protection",
+			.test = test_copy_key_fetch_prot,
+			.requirements_met = extension_cap > 0,
+		},
+		{
+			.name = "copy with key fetch protection override",
+			.test = test_copy_key_fetch_prot_override,
+			.requirements_met = extension_cap > 0,
+		},
+		{
+			.name = "error checks with key",
+			.test = test_errors_key,
+			.requirements_met = extension_cap > 0,
+		},
+		{
+			.name = "termination",
+			.test = test_termination,
+			.requirements_met = extension_cap > 0,
+		},
+		{
+			.name = "error checks with key storage protection override",
+			.test = test_errors_key_storage_prot_override,
+			.requirements_met = extension_cap > 0,
+		},
+		{
+			.name = "error checks without key fetch prot override",
+			.test = test_errors_key_fetch_prot_override_not_enabled,
+			.requirements_met = extension_cap > 0,
+		},
+		{
+			.name = "error checks with key fetch prot override",
+			.test = test_errors_key_fetch_prot_override_enabled,
+			.requirements_met = extension_cap > 0,
+		},
+	};
 
 	ksft_print_header();
-
 	ksft_set_plan(ARRAY_SIZE(testlist));
 
-	extension_cap = kvm_check_cap(KVM_CAP_S390_MEM_OP_EXTENSION);
 	for (idx = 0; idx < ARRAY_SIZE(testlist); idx++) {
-		if (extension_cap >= testlist[idx].extension) {
+		if (testlist[idx].requirements_met) {
 			testlist[idx].test();
 			ksft_test_result_pass("%s\n", testlist[idx].name);
 		} else {
-			ksft_test_result_skip("%s - extension level %d not supported\n",
-					      testlist[idx].name,
-					      testlist[idx].extension);
+			ksft_test_result_skip("%s - requirements not met (kernel has extension cap %#x)\n",
+					      testlist[idx].name, extension_cap);
 		}
 	}
 
-- 
2.39.1

[GIT PULL 06/18] KVM: s390: selftest: memop: Add bad address test

[Janosch Frank]

From: Janis Schoetterl-Glausch <scgl@linux.ibm.com>

Add a test that tries a real write to a bad address.
The existing CHECK_ONLY test doesn't cover all paths.

Signed-off-by: Janis Schoetterl-Glausch <scgl@linux.ibm.com>
Reviewed-by: Nico Boehr <nrb@linux.ibm.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Link: https://lore.kernel.org/r/20230206164602.138068-5-scgl@linux.ibm.com
Message-Id: <20230206164602.138068-5-scgl@linux.ibm.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
---
 tools/testing/selftests/kvm/s390x/memop.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/kvm/s390x/memop.c b/tools/testing/selftests/kvm/s390x/memop.c
index bbc191a13760..00737cceacda 100644
--- a/tools/testing/selftests/kvm/s390x/memop.c
+++ b/tools/testing/selftests/kvm/s390x/memop.c
@@ -641,7 +641,9 @@ static void _test_errors_common(struct test_info info, enum mop_target target, i
 
 	/* Bad guest address: */
 	rv = ERR_MOP(info, target, WRITE, mem1, size, GADDR((void *)~0xfffUL), CHECK_ONLY);
-	TEST_ASSERT(rv > 0, "ioctl does not report bad guest memory access");
+	TEST_ASSERT(rv > 0, "ioctl does not report bad guest memory address with CHECK_ONLY");
+	rv = ERR_MOP(info, target, WRITE, mem1, size, GADDR((void *)~0xfffUL));
+	TEST_ASSERT(rv > 0, "ioctl does not report bad guest memory address on write");
 
 	/* Bad host address: */
 	rv = ERR_MOP(info, target, WRITE, 0, size, GADDR_V(mem1));
-- 
2.39.1

[GIT PULL 07/18] KVM: s390: selftest: memop: Fix typo

[Janosch Frank]

From: Janis Schoetterl-Glausch <scgl@linux.ibm.com>

"acceeded" isn't a word, should be "exceeded".

Signed-off-by: Janis Schoetterl-Glausch <scgl@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Nico Boehr <nrb@linux.ibm.com>
Link: https://lore.kernel.org/r/20230206164602.138068-6-scgl@linux.ibm.com
Message-Id: <20230206164602.138068-6-scgl@linux.ibm.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
---
 tools/testing/selftests/kvm/s390x/memop.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/kvm/s390x/memop.c b/tools/testing/selftests/kvm/s390x/memop.c
index 00737cceacda..033a8603a096 100644
--- a/tools/testing/selftests/kvm/s390x/memop.c
+++ b/tools/testing/selftests/kvm/s390x/memop.c
@@ -602,7 +602,7 @@ static void test_errors_key_fetch_prot_override_enabled(void)
 
 	/*
 	 * vcpu, mismatching keys on fetch,
-	 * fetch protection override does not apply because memory range acceeded
+	 * fetch protection override does not apply because memory range exceeded
 	 */
 	CHECK_N_DO(ERR_PROT_MOP, t.vcpu, LOGICAL, READ, mem2, 2048 + 1, GADDR_V(0), KEY(2));
 	CHECK_N_DO(ERR_PROT_MOP, t.vcpu, LOGICAL, READ, mem2, PAGE_SIZE + 2048 + 1,
-- 
2.39.1

[GIT PULL 08/18] KVM: s390: selftest: memop: Fix wrong address being used in test

[Janosch Frank]

From: Janis Schoetterl-Glausch <scgl@linux.ibm.com>

The guest code sets the key for mem1 only. In order to provoke a
protection exception the test codes needs to address mem1.

Signed-off-by: Janis Schoetterl-Glausch <scgl@linux.ibm.com>
Reviewed-by: Nico Boehr <nrb@linux.ibm.com>
Link: https://lore.kernel.org/r/20230206164602.138068-7-scgl@linux.ibm.com
Message-Id: <20230206164602.138068-7-scgl@linux.ibm.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
---
 tools/testing/selftests/kvm/s390x/memop.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/kvm/s390x/memop.c b/tools/testing/selftests/kvm/s390x/memop.c
index 033a8603a096..1ae5c01f9904 100644
--- a/tools/testing/selftests/kvm/s390x/memop.c
+++ b/tools/testing/selftests/kvm/s390x/memop.c
@@ -450,9 +450,9 @@ static void test_errors_key(void)
 
 	/* vm/vcpu, mismatching keys, fetch protection in effect */
 	CHECK_N_DO(ERR_PROT_MOP, t.vcpu, LOGICAL, WRITE, mem1, t.size, GADDR_V(mem1), KEY(2));
-	CHECK_N_DO(ERR_PROT_MOP, t.vcpu, LOGICAL, READ, mem2, t.size, GADDR_V(mem2), KEY(2));
+	CHECK_N_DO(ERR_PROT_MOP, t.vcpu, LOGICAL, READ, mem2, t.size, GADDR_V(mem1), KEY(2));
 	CHECK_N_DO(ERR_PROT_MOP, t.vm, ABSOLUTE, WRITE, mem1, t.size, GADDR_V(mem1), KEY(2));
-	CHECK_N_DO(ERR_PROT_MOP, t.vm, ABSOLUTE, READ, mem2, t.size, GADDR_V(mem2), KEY(2));
+	CHECK_N_DO(ERR_PROT_MOP, t.vm, ABSOLUTE, READ, mem2, t.size, GADDR_V(mem1), KEY(2));
 
 	kvm_vm_free(t.kvm_vm);
 }
-- 
2.39.1

[GIT PULL 09/18] KVM: s390: selftest: memop: Fix integer literal

[Janosch Frank]

From: Janis Schoetterl-Glausch <scgl@linux.ibm.com>

The address is a 64 bit value, specifying a 32 bit value can crash the
guest. In this case things worked out with -O2 but not -O0.

Signed-off-by: Janis Schoetterl-Glausch <scgl@linux.ibm.com>
Fixes: 1bb873495a9e ("KVM: s390: selftests: Add more copy memop tests")
Reviewed-by: Thomas Huth <thuth@redhat.com>
Link: https://lore.kernel.org/r/20230206164602.138068-8-scgl@linux.ibm.com
Message-Id: <20230206164602.138068-8-scgl@linux.ibm.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
---
 tools/testing/selftests/kvm/s390x/memop.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/kvm/s390x/memop.c b/tools/testing/selftests/kvm/s390x/memop.c
index 1ae5c01f9904..c5fec84ef3c2 100644
--- a/tools/testing/selftests/kvm/s390x/memop.c
+++ b/tools/testing/selftests/kvm/s390x/memop.c
@@ -514,7 +514,7 @@ static void guest_copy_key_fetch_prot_override(void)
 	GUEST_SYNC(STAGE_INITED);
 	set_storage_key_range(0, PAGE_SIZE, 0x18);
 	set_storage_key_range((void *)last_page_addr, PAGE_SIZE, 0x0);
-	asm volatile ("sske %[key],%[addr]\n" :: [addr] "r"(0), [key] "r"(0x18) : "cc");
+	asm volatile ("sske %[key],%[addr]\n" :: [addr] "r"(0L), [key] "r"(0x18) : "cc");
 	GUEST_SYNC(STAGE_SKEYS_SET);
 
 	for (;;) {
-- 
2.39.1

[GIT PULL 10/18] KVM: s390: Move common code of mem_op functions into function

[Janosch Frank]

From: Janis Schoetterl-Glausch <scgl@linux.ibm.com>

The vcpu and vm mem_op ioctl implementations share some functionality.
Move argument checking into a function and call it from both
implementations. This allows code reuse in case of additional future
mem_op operations.

Suggested-by: Janosch Frank <frankja@linux.ibm.com>
Signed-off-by: Janis Schoetterl-Glausch <scgl@linux.ibm.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Link: https://lore.kernel.org/r/20230206164602.138068-9-scgl@linux.ibm.com
Message-Id: <20230206164602.138068-9-scgl@linux.ibm.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
---
 arch/s390/kvm/kvm-s390.c | 52 +++++++++++++++++++---------------------
 1 file changed, 24 insertions(+), 28 deletions(-)

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index cb72f9a09fb3..9645015f5921 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -2764,24 +2764,32 @@ static int kvm_s390_handle_pv(struct kvm *kvm, struct kvm_pv_cmd *cmd)
 	return r;
 }
 
-static bool access_key_invalid(u8 access_key)
+static int mem_op_validate_common(struct kvm_s390_mem_op *mop, u64 supported_flags)
 {
-	return access_key > 0xf;
+	if (mop->flags & ~supported_flags || !mop->size)
+		return -EINVAL;
+	if (mop->size > MEM_OP_MAX_SIZE)
+		return -E2BIG;
+	if (mop->flags & KVM_S390_MEMOP_F_SKEY_PROTECTION) {
+		if (mop->key > 0xf)
+			return -EINVAL;
+	} else {
+		mop->key = 0;
+	}
+	return 0;
 }
 
 static int kvm_s390_vm_mem_op(struct kvm *kvm, struct kvm_s390_mem_op *mop)
 {
 	void __user *uaddr = (void __user *)mop->buf;
-	u64 supported_flags;
 	void *tmpbuf = NULL;
 	int r, srcu_idx;
 
-	supported_flags = KVM_S390_MEMOP_F_SKEY_PROTECTION
-			  | KVM_S390_MEMOP_F_CHECK_ONLY;
-	if (mop->flags & ~supported_flags || !mop->size)
-		return -EINVAL;
-	if (mop->size > MEM_OP_MAX_SIZE)
-		return -E2BIG;
+	r = mem_op_validate_common(mop, KVM_S390_MEMOP_F_SKEY_PROTECTION |
+					KVM_S390_MEMOP_F_CHECK_ONLY);
+	if (r)
+		return r;
+
 	/*
 	 * This is technically a heuristic only, if the kvm->lock is not
 	 * taken, it is not guaranteed that the vm is/remains non-protected.
@@ -2793,12 +2801,6 @@ static int kvm_s390_vm_mem_op(struct kvm *kvm, struct kvm_s390_mem_op *mop)
 	 */
 	if (kvm_s390_pv_get_handle(kvm))
 		return -EINVAL;
-	if (mop->flags & KVM_S390_MEMOP_F_SKEY_PROTECTION) {
-		if (access_key_invalid(mop->key))
-			return -EINVAL;
-	} else {
-		mop->key = 0;
-	}
 	if (!(mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY)) {
 		tmpbuf = vmalloc(mop->size);
 		if (!tmpbuf)
@@ -5250,23 +5252,17 @@ static long kvm_s390_vcpu_mem_op(struct kvm_vcpu *vcpu,
 {
 	void __user *uaddr = (void __user *)mop->buf;
 	void *tmpbuf = NULL;
-	int r = 0;
-	const u64 supported_flags = KVM_S390_MEMOP_F_INJECT_EXCEPTION
-				    | KVM_S390_MEMOP_F_CHECK_ONLY
-				    | KVM_S390_MEMOP_F_SKEY_PROTECTION;
+	int r;
 
-	if (mop->flags & ~supported_flags || mop->ar >= NUM_ACRS || !mop->size)
+	r = mem_op_validate_common(mop, KVM_S390_MEMOP_F_INJECT_EXCEPTION |
+					KVM_S390_MEMOP_F_CHECK_ONLY |
+					KVM_S390_MEMOP_F_SKEY_PROTECTION);
+	if (r)
+		return r;
+	if (mop->ar >= NUM_ACRS)
 		return -EINVAL;
-	if (mop->size > MEM_OP_MAX_SIZE)
-		return -E2BIG;
 	if (kvm_s390_pv_cpu_is_protected(vcpu))
 		return -EINVAL;
-	if (mop->flags & KVM_S390_MEMOP_F_SKEY_PROTECTION) {
-		if (access_key_invalid(mop->key))
-			return -EINVAL;
-	} else {
-		mop->key = 0;
-	}
 	if (!(mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY)) {
 		tmpbuf = vmalloc(mop->size);
 		if (!tmpbuf)
-- 
2.39.1

[GIT PULL 11/18] KVM: s390: Dispatch to implementing function at top level of vm mem_op

[Janosch Frank]

From: Janis Schoetterl-Glausch <scgl@linux.ibm.com>

Instead of having one function covering all mem_op operations,
have a function implementing absolute access and dispatch to that
function in its caller, based on the operation code.
This way additional future operations can be implemented by adding an
implementing function without changing existing operations.

Suggested-by: Janosch Frank <frankja@linux.ibm.com>
Signed-off-by: Janis Schoetterl-Glausch <scgl@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Link: https://lore.kernel.org/r/20230206164602.138068-10-scgl@linux.ibm.com
Message-Id: <20230206164602.138068-10-scgl@linux.ibm.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
---
 arch/s390/kvm/kvm-s390.c | 38 ++++++++++++++++++++++++--------------
 1 file changed, 24 insertions(+), 14 deletions(-)

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 9645015f5921..0053b1fbfc76 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -2779,7 +2779,7 @@ static int mem_op_validate_common(struct kvm_s390_mem_op *mop, u64 supported_fla
 	return 0;
 }
 
-static int kvm_s390_vm_mem_op(struct kvm *kvm, struct kvm_s390_mem_op *mop)
+static int kvm_s390_vm_mem_op_abs(struct kvm *kvm, struct kvm_s390_mem_op *mop)
 {
 	void __user *uaddr = (void __user *)mop->buf;
 	void *tmpbuf = NULL;
@@ -2790,17 +2790,6 @@ static int kvm_s390_vm_mem_op(struct kvm *kvm, struct kvm_s390_mem_op *mop)
 	if (r)
 		return r;
 
-	/*
-	 * This is technically a heuristic only, if the kvm->lock is not
-	 * taken, it is not guaranteed that the vm is/remains non-protected.
-	 * This is ok from a kernel perspective, wrongdoing is detected
-	 * on the access, -EFAULT is returned and the vm may crash the
-	 * next time it accesses the memory in question.
-	 * There is no sane usecase to do switching and a memop on two
-	 * different CPUs at the same time.
-	 */
-	if (kvm_s390_pv_get_handle(kvm))
-		return -EINVAL;
 	if (!(mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY)) {
 		tmpbuf = vmalloc(mop->size);
 		if (!tmpbuf)
@@ -2841,8 +2830,6 @@ static int kvm_s390_vm_mem_op(struct kvm *kvm, struct kvm_s390_mem_op *mop)
 		}
 		break;
 	}
-	default:
-		r = -EINVAL;
 	}
 
 out_unlock:
@@ -2852,6 +2839,29 @@ static int kvm_s390_vm_mem_op(struct kvm *kvm, struct kvm_s390_mem_op *mop)
 	return r;
 }
 
+static int kvm_s390_vm_mem_op(struct kvm *kvm, struct kvm_s390_mem_op *mop)
+{
+	/*
+	 * This is technically a heuristic only, if the kvm->lock is not
+	 * taken, it is not guaranteed that the vm is/remains non-protected.
+	 * This is ok from a kernel perspective, wrongdoing is detected
+	 * on the access, -EFAULT is returned and the vm may crash the
+	 * next time it accesses the memory in question.
+	 * There is no sane usecase to do switching and a memop on two
+	 * different CPUs at the same time.
+	 */
+	if (kvm_s390_pv_get_handle(kvm))
+		return -EINVAL;
+
+	switch (mop->op) {
+	case KVM_S390_MEMOP_ABSOLUTE_READ:
+	case KVM_S390_MEMOP_ABSOLUTE_WRITE:
+		return kvm_s390_vm_mem_op_abs(kvm, mop);
+	default:
+		return -EINVAL;
+	}
+}
+
 long kvm_arch_vm_ioctl(struct file *filp,
 		       unsigned int ioctl, unsigned long arg)
 {
-- 
2.39.1

[GIT PULL 12/18] KVM: s390: Refactor absolute vm mem_op function

[Janosch Frank]

From: Janis Schoetterl-Glausch <scgl@linux.ibm.com>

Remove code duplication with regards to the CHECK_ONLY flag.
Decrease the number of indents.
No functional change indented.

Suggested-by: Janosch Frank <frankja@linux.ibm.com>
Signed-off-by: Janis Schoetterl-Glausch <scgl@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Link: https://lore.kernel.org/r/20230206164602.138068-11-scgl@linux.ibm.com
Message-Id: <20230206164602.138068-11-scgl@linux.ibm.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
---
 arch/s390/kvm/kvm-s390.c | 43 +++++++++++++++++-----------------------
 1 file changed, 18 insertions(+), 25 deletions(-)

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 0053b1fbfc76..23f50437a328 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -2782,6 +2782,7 @@ static int mem_op_validate_common(struct kvm_s390_mem_op *mop, u64 supported_fla
 static int kvm_s390_vm_mem_op_abs(struct kvm *kvm, struct kvm_s390_mem_op *mop)
 {
 	void __user *uaddr = (void __user *)mop->buf;
+	enum gacc_mode acc_mode;
 	void *tmpbuf = NULL;
 	int r, srcu_idx;
 
@@ -2803,33 +2804,25 @@ static int kvm_s390_vm_mem_op_abs(struct kvm *kvm, struct kvm_s390_mem_op *mop)
 		goto out_unlock;
 	}
 
-	switch (mop->op) {
-	case KVM_S390_MEMOP_ABSOLUTE_READ: {
-		if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) {
-			r = check_gpa_range(kvm, mop->gaddr, mop->size, GACC_FETCH, mop->key);
-		} else {
-			r = access_guest_abs_with_key(kvm, mop->gaddr, tmpbuf,
-						      mop->size, GACC_FETCH, mop->key);
-			if (r == 0) {
-				if (copy_to_user(uaddr, tmpbuf, mop->size))
-					r = -EFAULT;
-			}
-		}
-		break;
+	acc_mode = mop->op == KVM_S390_MEMOP_ABSOLUTE_READ ? GACC_FETCH : GACC_STORE;
+	if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) {
+		r = check_gpa_range(kvm, mop->gaddr, mop->size, acc_mode, mop->key);
+		goto out_unlock;
 	}
-	case KVM_S390_MEMOP_ABSOLUTE_WRITE: {
-		if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) {
-			r = check_gpa_range(kvm, mop->gaddr, mop->size, GACC_STORE, mop->key);
-		} else {
-			if (copy_from_user(tmpbuf, uaddr, mop->size)) {
-				r = -EFAULT;
-				break;
-			}
-			r = access_guest_abs_with_key(kvm, mop->gaddr, tmpbuf,
-						      mop->size, GACC_STORE, mop->key);
+	if (acc_mode == GACC_FETCH) {
+		r = access_guest_abs_with_key(kvm, mop->gaddr, tmpbuf,
+					      mop->size, GACC_FETCH, mop->key);
+		if (r)
+			goto out_unlock;
+		if (copy_to_user(uaddr, tmpbuf, mop->size))
+			r = -EFAULT;
+	} else {
+		if (copy_from_user(tmpbuf, uaddr, mop->size)) {
+			r = -EFAULT;
+			goto out_unlock;
 		}
-		break;
-	}
+		r = access_guest_abs_with_key(kvm, mop->gaddr, tmpbuf,
+					      mop->size, GACC_STORE, mop->key);
 	}
 
 out_unlock:
-- 
2.39.1

[GIT PULL 13/18] KVM: s390: Refactor vcpu mem_op function

[Janosch Frank]

From: Janis Schoetterl-Glausch <scgl@linux.ibm.com>

Remove code duplication with regards to the CHECK_ONLY flag.
Decrease the number of indents.
No functional change indented.

Suggested-by: Janosch Frank <frankja@linux.ibm.com>
Signed-off-by: Janis Schoetterl-Glausch <scgl@linux.ibm.com>
Link: https://lore.kernel.org/r/20230206164602.138068-12-scgl@linux.ibm.com
Message-Id: <20230206164602.138068-12-scgl@linux.ibm.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
---
 arch/s390/kvm/kvm-s390.c | 36 +++++++++++++++++-------------------
 1 file changed, 17 insertions(+), 19 deletions(-)

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 23f50437a328..17368d118653 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -5254,6 +5254,7 @@ static long kvm_s390_vcpu_mem_op(struct kvm_vcpu *vcpu,
 				 struct kvm_s390_mem_op *mop)
 {
 	void __user *uaddr = (void __user *)mop->buf;
+	enum gacc_mode acc_mode;
 	void *tmpbuf = NULL;
 	int r;
 
@@ -5272,38 +5273,35 @@ static long kvm_s390_vcpu_mem_op(struct kvm_vcpu *vcpu,
 			return -ENOMEM;
 	}
 
-	switch (mop->op) {
-	case KVM_S390_MEMOP_LOGICAL_READ:
-		if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) {
-			r = check_gva_range(vcpu, mop->gaddr, mop->ar, mop->size,
-					    GACC_FETCH, mop->key);
-			break;
-		}
+	acc_mode = mop->op == KVM_S390_MEMOP_LOGICAL_READ ? GACC_FETCH : GACC_STORE;
+	if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) {
+		r = check_gva_range(vcpu, mop->gaddr, mop->ar, mop->size,
+				    acc_mode, mop->key);
+		goto out_inject;
+	}
+	if (acc_mode == GACC_FETCH) {
 		r = read_guest_with_key(vcpu, mop->gaddr, mop->ar, tmpbuf,
 					mop->size, mop->key);
-		if (r == 0) {
-			if (copy_to_user(uaddr, tmpbuf, mop->size))
-				r = -EFAULT;
-		}
-		break;
-	case KVM_S390_MEMOP_LOGICAL_WRITE:
-		if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) {
-			r = check_gva_range(vcpu, mop->gaddr, mop->ar, mop->size,
-					    GACC_STORE, mop->key);
-			break;
+		if (r)
+			goto out_inject;
+		if (copy_to_user(uaddr, tmpbuf, mop->size)) {
+			r = -EFAULT;
+			goto out_free;
 		}
+	} else {
 		if (copy_from_user(tmpbuf, uaddr, mop->size)) {
 			r = -EFAULT;
-			break;
+			goto out_free;
 		}
 		r = write_guest_with_key(vcpu, mop->gaddr, mop->ar, tmpbuf,
 					 mop->size, mop->key);
-		break;
 	}
 
+out_inject:
 	if (r > 0 && (mop->flags & KVM_S390_MEMOP_F_INJECT_EXCEPTION) != 0)
 		kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
 
+out_free:
 	vfree(tmpbuf);
 	return r;
 }
-- 
2.39.1

[GIT PULL 14/18] KVM: s390: Extend MEM_OP ioctl by storage key checked cmpxchg

[Janosch Frank]

From: Janis Schoetterl-Glausch <scgl@linux.ibm.com>

User space can use the MEM_OP ioctl to make storage key checked reads
and writes to the guest, however, it has no way of performing atomic,
key checked, accesses to the guest.
Extend the MEM_OP ioctl in order to allow for this, by adding a cmpxchg
op. For now, support this op for absolute accesses only.

This op can be used, for example, to set the device-state-change
indicator and the adapter-local-summary indicator atomically.

Signed-off-by: Janis Schoetterl-Glausch <scgl@linux.ibm.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Link: https://lore.kernel.org/r/20230206164602.138068-13-scgl@linux.ibm.com
Message-Id: <20230206164602.138068-13-scgl@linux.ibm.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
---
 arch/s390/kvm/gaccess.c  | 109 +++++++++++++++++++++++++++++++++++++++
 arch/s390/kvm/gaccess.h  |   3 ++
 arch/s390/kvm/kvm-s390.c |  56 +++++++++++++++++++-
 include/uapi/linux/kvm.h |   8 +++
 4 files changed, 175 insertions(+), 1 deletion(-)

diff --git a/arch/s390/kvm/gaccess.c b/arch/s390/kvm/gaccess.c
index 0243b6e38d36..3eb85f254881 100644
--- a/arch/s390/kvm/gaccess.c
+++ b/arch/s390/kvm/gaccess.c
@@ -1161,6 +1161,115 @@ int access_guest_real(struct kvm_vcpu *vcpu, unsigned long gra,
 	return rc;
 }
 
+/**
+ * cmpxchg_guest_abs_with_key() - Perform cmpxchg on guest absolute address.
+ * @kvm: Virtual machine instance.
+ * @gpa: Absolute guest address of the location to be changed.
+ * @len: Operand length of the cmpxchg, required: 1 <= len <= 16. Providing a
+ *       non power of two will result in failure.
+ * @old_addr: Pointer to old value. If the location at @gpa contains this value,
+ *            the exchange will succeed. After calling cmpxchg_guest_abs_with_key()
+ *            *@old_addr contains the value at @gpa before the attempt to
+ *            exchange the value.
+ * @new: The value to place at @gpa.
+ * @access_key: The access key to use for the guest access.
+ * @success: output value indicating if an exchange occurred.
+ *
+ * Atomically exchange the value at @gpa by @new, if it contains *@old.
+ * Honors storage keys.
+ *
+ * Return: * 0: successful exchange
+ *         * >0: a program interruption code indicating the reason cmpxchg could
+ *               not be attempted
+ *         * -EINVAL: address misaligned or len not power of two
+ *         * -EAGAIN: transient failure (len 1 or 2)
+ *         * -EOPNOTSUPP: read-only memslot (should never occur)
+ */
+int cmpxchg_guest_abs_with_key(struct kvm *kvm, gpa_t gpa, int len,
+			       __uint128_t *old_addr, __uint128_t new,
+			       u8 access_key, bool *success)
+{
+	gfn_t gfn = gpa_to_gfn(gpa);
+	struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
+	bool writable;
+	hva_t hva;
+	int ret;
+
+	if (!IS_ALIGNED(gpa, len))
+		return -EINVAL;
+
+	hva = gfn_to_hva_memslot_prot(slot, gfn, &writable);
+	if (kvm_is_error_hva(hva))
+		return PGM_ADDRESSING;
+	/*
+	 * Check if it's a read-only memslot, even though that cannot occur
+	 * since those are unsupported.
+	 * Don't try to actually handle that case.
+	 */
+	if (!writable)
+		return -EOPNOTSUPP;
+
+	hva += offset_in_page(gpa);
+	/*
+	 * The cmpxchg_user_key macro depends on the type of "old", so we need
+	 * a case for each valid length and get some code duplication as long
+	 * as we don't introduce a new macro.
+	 */
+	switch (len) {
+	case 1: {
+		u8 old;
+
+		ret = cmpxchg_user_key((u8 __user *)hva, &old, *old_addr, new, access_key);
+		*success = !ret && old == *old_addr;
+		*old_addr = old;
+		break;
+	}
+	case 2: {
+		u16 old;
+
+		ret = cmpxchg_user_key((u16 __user *)hva, &old, *old_addr, new, access_key);
+		*success = !ret && old == *old_addr;
+		*old_addr = old;
+		break;
+	}
+	case 4: {
+		u32 old;
+
+		ret = cmpxchg_user_key((u32 __user *)hva, &old, *old_addr, new, access_key);
+		*success = !ret && old == *old_addr;
+		*old_addr = old;
+		break;
+	}
+	case 8: {
+		u64 old;
+
+		ret = cmpxchg_user_key((u64 __user *)hva, &old, *old_addr, new, access_key);
+		*success = !ret && old == *old_addr;
+		*old_addr = old;
+		break;
+	}
+	case 16: {
+		__uint128_t old;
+
+		ret = cmpxchg_user_key((__uint128_t __user *)hva, &old, *old_addr, new, access_key);
+		*success = !ret && old == *old_addr;
+		*old_addr = old;
+		break;
+	}
+	default:
+		return -EINVAL;
+	}
+	if (*success)
+		mark_page_dirty_in_slot(kvm, slot, gfn);
+	/*
+	 * Assume that the fault is caused by protection, either key protection
+	 * or user page write protection.
+	 */
+	if (ret == -EFAULT)
+		ret = PGM_PROTECTION;
+	return ret;
+}
+
 /**
  * guest_translate_address_with_key - translate guest logical into guest absolute address
  * @vcpu: virtual cpu
diff --git a/arch/s390/kvm/gaccess.h b/arch/s390/kvm/gaccess.h
index 9408d6cc8e2c..b320d12aa049 100644
--- a/arch/s390/kvm/gaccess.h
+++ b/arch/s390/kvm/gaccess.h
@@ -206,6 +206,9 @@ int access_guest_with_key(struct kvm_vcpu *vcpu, unsigned long ga, u8 ar,
 int access_guest_real(struct kvm_vcpu *vcpu, unsigned long gra,
 		      void *data, unsigned long len, enum gacc_mode mode);
 
+int cmpxchg_guest_abs_with_key(struct kvm *kvm, gpa_t gpa, int len, __uint128_t *old,
+			       __uint128_t new, u8 access_key, bool *success);
+
 /**
  * write_guest_with_key - copy data from kernel space to guest space
  * @vcpu: virtual cpu
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 17368d118653..8dfda720f60d 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -584,7 +584,6 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 	case KVM_CAP_S390_VCPU_RESETS:
 	case KVM_CAP_SET_GUEST_DEBUG:
 	case KVM_CAP_S390_DIAG318:
-	case KVM_CAP_S390_MEM_OP_EXTENSION:
 		r = 1;
 		break;
 	case KVM_CAP_SET_GUEST_DEBUG2:
@@ -598,6 +597,15 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 	case KVM_CAP_S390_MEM_OP:
 		r = MEM_OP_MAX_SIZE;
 		break;
+	case KVM_CAP_S390_MEM_OP_EXTENSION:
+		/*
+		 * Flag bits indicating which extensions are supported.
+		 * If r > 0, the base extension must also be supported/indicated,
+		 * in order to maintain backwards compatibility.
+		 */
+		r = KVM_S390_MEMOP_EXTENSION_CAP_BASE |
+		    KVM_S390_MEMOP_EXTENSION_CAP_CMPXCHG;
+		break;
 	case KVM_CAP_NR_VCPUS:
 	case KVM_CAP_MAX_VCPUS:
 	case KVM_CAP_MAX_VCPU_ID:
@@ -2832,6 +2840,50 @@ static int kvm_s390_vm_mem_op_abs(struct kvm *kvm, struct kvm_s390_mem_op *mop)
 	return r;
 }
 
+static int kvm_s390_vm_mem_op_cmpxchg(struct kvm *kvm, struct kvm_s390_mem_op *mop)
+{
+	void __user *uaddr = (void __user *)mop->buf;
+	void __user *old_addr = (void __user *)mop->old_addr;
+	union {
+		__uint128_t quad;
+		char raw[sizeof(__uint128_t)];
+	} old = { .quad = 0}, new = { .quad = 0 };
+	unsigned int off_in_quad = sizeof(new) - mop->size;
+	int r, srcu_idx;
+	bool success;
+
+	r = mem_op_validate_common(mop, KVM_S390_MEMOP_F_SKEY_PROTECTION);
+	if (r)
+		return r;
+	/*
+	 * This validates off_in_quad. Checking that size is a power
+	 * of two is not necessary, as cmpxchg_guest_abs_with_key
+	 * takes care of that
+	 */
+	if (mop->size > sizeof(new))
+		return -EINVAL;
+	if (copy_from_user(&new.raw[off_in_quad], uaddr, mop->size))
+		return -EFAULT;
+	if (copy_from_user(&old.raw[off_in_quad], old_addr, mop->size))
+		return -EFAULT;
+
+	srcu_idx = srcu_read_lock(&kvm->srcu);
+
+	if (kvm_is_error_gpa(kvm, mop->gaddr)) {
+		r = PGM_ADDRESSING;
+		goto out_unlock;
+	}
+
+	r = cmpxchg_guest_abs_with_key(kvm, mop->gaddr, mop->size, &old.quad,
+				       new.quad, mop->key, &success);
+	if (!success && copy_to_user(old_addr, &old.raw[off_in_quad], mop->size))
+		r = -EFAULT;
+
+out_unlock:
+	srcu_read_unlock(&kvm->srcu, srcu_idx);
+	return r;
+}
+
 static int kvm_s390_vm_mem_op(struct kvm *kvm, struct kvm_s390_mem_op *mop)
 {
 	/*
@@ -2850,6 +2902,8 @@ static int kvm_s390_vm_mem_op(struct kvm *kvm, struct kvm_s390_mem_op *mop)
 	case KVM_S390_MEMOP_ABSOLUTE_READ:
 	case KVM_S390_MEMOP_ABSOLUTE_WRITE:
 		return kvm_s390_vm_mem_op_abs(kvm, mop);
+	case KVM_S390_MEMOP_ABSOLUTE_CMPXCHG:
+		return kvm_s390_vm_mem_op_cmpxchg(kvm, mop);
 	default:
 		return -EINVAL;
 	}
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 55155e262646..d2f30463c133 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -583,6 +583,8 @@ struct kvm_s390_mem_op {
 		struct {
 			__u8 ar;	/* the access register number */
 			__u8 key;	/* access key, ignored if flag unset */
+			__u8 pad1[6];	/* ignored */
+			__u64 old_addr;	/* ignored if cmpxchg flag unset */
 		};
 		__u32 sida_offset; /* offset into the sida */
 		__u8 reserved[32]; /* ignored */
@@ -595,11 +597,17 @@ struct kvm_s390_mem_op {
 #define KVM_S390_MEMOP_SIDA_WRITE	3
 #define KVM_S390_MEMOP_ABSOLUTE_READ	4
 #define KVM_S390_MEMOP_ABSOLUTE_WRITE	5
+#define KVM_S390_MEMOP_ABSOLUTE_CMPXCHG	6
+
 /* flags for kvm_s390_mem_op->flags */
 #define KVM_S390_MEMOP_F_CHECK_ONLY		(1ULL << 0)
 #define KVM_S390_MEMOP_F_INJECT_EXCEPTION	(1ULL << 1)
 #define KVM_S390_MEMOP_F_SKEY_PROTECTION	(1ULL << 2)
 
+/* flags specifying extension support via KVM_CAP_S390_MEM_OP_EXTENSION */
+#define KVM_S390_MEMOP_EXTENSION_CAP_BASE	(1 << 0)
+#define KVM_S390_MEMOP_EXTENSION_CAP_CMPXCHG	(1 << 1)
+
 /* for KVM_INTERRUPT */
 struct kvm_interrupt {
 	/* in */
-- 
2.39.1

[GIT PULL 15/18] Documentation: KVM: s390: Describe KVM_S390_MEMOP_F_CMPXCHG

[Janosch Frank]

From: Janis Schoetterl-Glausch <scgl@linux.ibm.com>

Describe the semantics of the new KVM_S390_MEMOP_F_CMPXCHG flag for
absolute vm write memops which allows user space to perform (storage key
checked) cmpxchg operations on guest memory.

Signed-off-by: Janis Schoetterl-Glausch <scgl@linux.ibm.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Link: https://lore.kernel.org/r/20230206164602.138068-14-scgl@linux.ibm.com
Message-Id: <20230206164602.138068-14-scgl@linux.ibm.com>
[frankja@de.ibm.com: Removed a line from an earlier version]
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
---
 Documentation/virt/kvm/api.rst | 28 +++++++++++++++++++++++++---
 1 file changed, 25 insertions(+), 3 deletions(-)

diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
index 8cd7fd05d53b..a4c9dbccc7c2 100644
--- a/Documentation/virt/kvm/api.rst
+++ b/Documentation/virt/kvm/api.rst
@@ -3728,7 +3728,7 @@ The fields in each entry are defined as follows:
 :Parameters: struct kvm_s390_mem_op (in)
 :Returns: = 0 on success,
           < 0 on generic error (e.g. -EFAULT or -ENOMEM),
-          > 0 if an exception occurred while walking the page tables
+          16 bit program exception code if the access causes such an exception
 
 Read or write data from/to the VM's memory.
 The KVM_CAP_S390_MEM_OP_EXTENSION capability specifies what functionality is
@@ -3746,6 +3746,8 @@ Parameters are specified via the following structure::
 		struct {
 			__u8 ar;	/* the access register number */
 			__u8 key;	/* access key, ignored if flag unset */
+			__u8 pad1[6];	/* ignored */
+			__u64 old_addr;	/* ignored if flag unset */
 		};
 		__u32 sida_offset; /* offset into the sida */
 		__u8 reserved[32]; /* ignored */
@@ -3773,6 +3775,7 @@ Possible operations are:
   * ``KVM_S390_MEMOP_ABSOLUTE_WRITE``
   * ``KVM_S390_MEMOP_SIDA_READ``
   * ``KVM_S390_MEMOP_SIDA_WRITE``
+  * ``KVM_S390_MEMOP_ABSOLUTE_CMPXCHG``
 
 Logical read/write:
 ^^^^^^^^^^^^^^^^^^^
@@ -3821,7 +3824,7 @@ the checks required for storage key protection as one operation (as opposed to
 user space getting the storage keys, performing the checks, and accessing
 memory thereafter, which could lead to a delay between check and access).
 Absolute accesses are permitted for the VM ioctl if KVM_CAP_S390_MEM_OP_EXTENSION
-is > 0.
+has the KVM_S390_MEMOP_EXTENSION_CAP_BASE bit set.
 Currently absolute accesses are not permitted for VCPU ioctls.
 Absolute accesses are permitted for non-protected guests only.
 
@@ -3829,7 +3832,26 @@ Supported flags:
   * ``KVM_S390_MEMOP_F_CHECK_ONLY``
   * ``KVM_S390_MEMOP_F_SKEY_PROTECTION``
 
-The semantics of the flags are as for logical accesses.
+The semantics of the flags common with logical accesses are as for logical
+accesses.
+
+Absolute cmpxchg:
+^^^^^^^^^^^^^^^^^
+
+Perform cmpxchg on absolute guest memory. Intended for use with the
+KVM_S390_MEMOP_F_SKEY_PROTECTION flag.
+Instead of doing an unconditional write, the access occurs only if the target
+location contains the value pointed to by "old_addr".
+This is performed as an atomic cmpxchg with the length specified by the "size"
+parameter. "size" must be a power of two up to and including 16.
+If the exchange did not take place because the target value doesn't match the
+old value, the value "old_addr" points to is replaced by the target value.
+User space can tell if an exchange took place by checking if this replacement
+occurred. The cmpxchg op is permitted for the VM ioctl if
+KVM_CAP_S390_MEM_OP_EXTENSION has flag KVM_S390_MEMOP_EXTENSION_CAP_CMPXCHG set.
+
+Supported flags:
+  * ``KVM_S390_MEMOP_F_SKEY_PROTECTION``
 
 SIDA read/write:
 ^^^^^^^^^^^^^^^^
-- 
2.39.1

[GIT PULL 16/18] KVM: s390: selftest: memop: Add cmpxchg tests

[Janosch Frank]

From: Janis Schoetterl-Glausch <scgl@linux.ibm.com>

Test successful exchange, unsuccessful exchange, storage key protection
and invalid arguments.

Signed-off-by: Janis Schoetterl-Glausch <scgl@linux.ibm.com>
Acked-by: Janosch Frank <frankja@linux.ibm.com>
Link: https://lore.kernel.org/r/20230207164225.2114706-1-scgl@linux.ibm.com
Message-Id: <20230207164225.2114706-1-scgl@linux.ibm.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
---
 tools/testing/selftests/kvm/s390x/memop.c | 411 +++++++++++++++++++++-
 1 file changed, 394 insertions(+), 17 deletions(-)

diff --git a/tools/testing/selftests/kvm/s390x/memop.c b/tools/testing/selftests/kvm/s390x/memop.c
index c5fec84ef3c2..8e4b94d7b8dd 100644
--- a/tools/testing/selftests/kvm/s390x/memop.c
+++ b/tools/testing/selftests/kvm/s390x/memop.c
@@ -9,6 +9,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <sys/ioctl.h>
+#include <pthread.h>
 
 #include <linux/bits.h>
 
@@ -26,6 +27,7 @@ enum mop_target {
 enum mop_access_mode {
 	READ,
 	WRITE,
+	CMPXCHG,
 };
 
 struct mop_desc {
@@ -44,13 +46,16 @@ struct mop_desc {
 	enum mop_access_mode mode;
 	void *buf;
 	uint32_t sida_offset;
+	void *old;
+	uint8_t old_value[16];
+	bool *cmpxchg_success;
 	uint8_t ar;
 	uint8_t key;
 };
 
 const uint8_t NO_KEY = 0xff;
 
-static struct kvm_s390_mem_op ksmo_from_desc(const struct mop_desc *desc)
+static struct kvm_s390_mem_op ksmo_from_desc(struct mop_desc *desc)
 {
 	struct kvm_s390_mem_op ksmo = {
 		.gaddr = (uintptr_t)desc->gaddr,
@@ -77,6 +82,11 @@ static struct kvm_s390_mem_op ksmo_from_desc(const struct mop_desc *desc)
 			ksmo.op = KVM_S390_MEMOP_ABSOLUTE_READ;
 		if (desc->mode == WRITE)
 			ksmo.op = KVM_S390_MEMOP_ABSOLUTE_WRITE;
+		if (desc->mode == CMPXCHG) {
+			ksmo.op = KVM_S390_MEMOP_ABSOLUTE_CMPXCHG;
+			ksmo.old_addr = (uint64_t)desc->old;
+			memcpy(desc->old_value, desc->old, desc->size);
+		}
 		break;
 	case INVALID:
 		ksmo.op = -1;
@@ -135,9 +145,13 @@ static void print_memop(struct kvm_vcpu *vcpu, const struct kvm_s390_mem_op *ksm
 	case KVM_S390_MEMOP_ABSOLUTE_WRITE:
 		printf("ABSOLUTE, WRITE, ");
 		break;
+	case KVM_S390_MEMOP_ABSOLUTE_CMPXCHG:
+		printf("ABSOLUTE, CMPXCHG, ");
+		break;
 	}
-	printf("gaddr=%llu, size=%u, buf=%llu, ar=%u, key=%u",
-	       ksmo->gaddr, ksmo->size, ksmo->buf, ksmo->ar, ksmo->key);
+	printf("gaddr=%llu, size=%u, buf=%llu, ar=%u, key=%u, old_addr=%llx",
+	       ksmo->gaddr, ksmo->size, ksmo->buf, ksmo->ar, ksmo->key,
+	       ksmo->old_addr);
 	if (ksmo->flags & KVM_S390_MEMOP_F_CHECK_ONLY)
 		printf(", CHECK_ONLY");
 	if (ksmo->flags & KVM_S390_MEMOP_F_INJECT_EXCEPTION)
@@ -147,17 +161,8 @@ static void print_memop(struct kvm_vcpu *vcpu, const struct kvm_s390_mem_op *ksm
 	puts(")");
 }
 
-static void memop_ioctl(struct test_info info, struct kvm_s390_mem_op *ksmo)
-{
-	struct kvm_vcpu *vcpu = info.vcpu;
-
-	if (!vcpu)
-		vm_ioctl(info.vm, KVM_S390_MEM_OP, ksmo);
-	else
-		vcpu_ioctl(vcpu, KVM_S390_MEM_OP, ksmo);
-}
-
-static int err_memop_ioctl(struct test_info info, struct kvm_s390_mem_op *ksmo)
+static int err_memop_ioctl(struct test_info info, struct kvm_s390_mem_op *ksmo,
+			   struct mop_desc *desc)
 {
 	struct kvm_vcpu *vcpu = info.vcpu;
 
@@ -167,6 +172,21 @@ static int err_memop_ioctl(struct test_info info, struct kvm_s390_mem_op *ksmo)
 		return __vcpu_ioctl(vcpu, KVM_S390_MEM_OP, ksmo);
 }
 
+static void memop_ioctl(struct test_info info, struct kvm_s390_mem_op *ksmo,
+			struct mop_desc *desc)
+{
+	int r;
+
+	r = err_memop_ioctl(info, ksmo, desc);
+	if (ksmo->op == KVM_S390_MEMOP_ABSOLUTE_CMPXCHG) {
+		if (desc->cmpxchg_success) {
+			int diff = memcmp(desc->old_value, desc->old, desc->size);
+			*desc->cmpxchg_success = !diff;
+		}
+	}
+	TEST_ASSERT(!r, __KVM_IOCTL_ERROR("KVM_S390_MEM_OP", r));
+}
+
 #define MEMOP(err, info_p, mop_target_p, access_mode_p, buf_p, size_p, ...)	\
 ({										\
 	struct test_info __info = (info_p);					\
@@ -187,7 +207,7 @@ static int err_memop_ioctl(struct test_info info, struct kvm_s390_mem_op *ksmo)
 	}									\
 	__ksmo = ksmo_from_desc(&__desc);					\
 	print_memop(__info.vcpu, &__ksmo);					\
-	err##memop_ioctl(__info, &__ksmo);					\
+	err##memop_ioctl(__info, &__ksmo, &__desc);				\
 })
 
 #define MOP(...) MEMOP(, __VA_ARGS__)
@@ -201,6 +221,8 @@ static int err_memop_ioctl(struct test_info info, struct kvm_s390_mem_op *ksmo)
 #define AR(a) ._ar = 1, .ar = (a)
 #define KEY(a) .f_key = 1, .key = (a)
 #define INJECT .f_inject = 1
+#define CMPXCHG_OLD(o) .old = (o)
+#define CMPXCHG_SUCCESS(s) .cmpxchg_success = (s)
 
 #define CHECK_N_DO(f, ...) ({ f(__VA_ARGS__, CHECK_ONLY); f(__VA_ARGS__); })
 
@@ -210,8 +232,8 @@ static int err_memop_ioctl(struct test_info info, struct kvm_s390_mem_op *ksmo)
 #define CR0_FETCH_PROTECTION_OVERRIDE	(1UL << (63 - 38))
 #define CR0_STORAGE_PROTECTION_OVERRIDE	(1UL << (63 - 39))
 
-static uint8_t mem1[65536];
-static uint8_t mem2[65536];
+static uint8_t __aligned(PAGE_SIZE) mem1[65536];
+static uint8_t __aligned(PAGE_SIZE) mem2[65536];
 
 struct test_default {
 	struct kvm_vm *kvm_vm;
@@ -243,6 +265,8 @@ enum stage {
 	STAGE_SKEYS_SET,
 	/* Guest copied memory (locations up to test case) */
 	STAGE_COPIED,
+	/* End of guest code reached */
+	STAGE_DONE,
 };
 
 #define HOST_SYNC(info_p, stage)					\
@@ -254,6 +278,9 @@ enum stage {
 									\
 	vcpu_run(__vcpu);						\
 	get_ucall(__vcpu, &uc);						\
+	if (uc.cmd == UCALL_ABORT) {					\
+		REPORT_GUEST_ASSERT_2(uc, "hints: %lu, %lu");		\
+	}								\
 	ASSERT_EQ(uc.cmd, UCALL_SYNC);					\
 	ASSERT_EQ(uc.args[1], __stage);					\
 })									\
@@ -293,6 +320,44 @@ static void default_read(struct test_info copy_cpu, struct test_info mop_cpu,
 	ASSERT_MEM_EQ(mem1, mem2, size);
 }
 
+static void default_cmpxchg(struct test_default *test, uint8_t key)
+{
+	for (int size = 1; size <= 16; size *= 2) {
+		for (int offset = 0; offset < 16; offset += size) {
+			uint8_t __aligned(16) new[16] = {};
+			uint8_t __aligned(16) old[16];
+			bool succ;
+
+			prepare_mem12();
+			default_write_read(test->vcpu, test->vcpu, LOGICAL, 16, NO_KEY);
+
+			memcpy(&old, mem1, 16);
+			MOP(test->vm, ABSOLUTE, CMPXCHG, new + offset,
+			    size, GADDR_V(mem1 + offset),
+			    CMPXCHG_OLD(old + offset),
+			    CMPXCHG_SUCCESS(&succ), KEY(key));
+			HOST_SYNC(test->vcpu, STAGE_COPIED);
+			MOP(test->vm, ABSOLUTE, READ, mem2, 16, GADDR_V(mem2));
+			TEST_ASSERT(succ, "exchange of values should succeed");
+			memcpy(mem1 + offset, new + offset, size);
+			ASSERT_MEM_EQ(mem1, mem2, 16);
+
+			memcpy(&old, mem1, 16);
+			new[offset]++;
+			old[offset]++;
+			MOP(test->vm, ABSOLUTE, CMPXCHG, new + offset,
+			    size, GADDR_V(mem1 + offset),
+			    CMPXCHG_OLD(old + offset),
+			    CMPXCHG_SUCCESS(&succ), KEY(key));
+			HOST_SYNC(test->vcpu, STAGE_COPIED);
+			MOP(test->vm, ABSOLUTE, READ, mem2, 16, GADDR_V(mem2));
+			TEST_ASSERT(!succ, "exchange of values should not succeed");
+			ASSERT_MEM_EQ(mem1, mem2, 16);
+			ASSERT_MEM_EQ(&old, mem1, 16);
+		}
+	}
+}
+
 static void guest_copy(void)
 {
 	GUEST_SYNC(STAGE_INITED);
@@ -377,6 +442,248 @@ static void test_copy_key(void)
 	kvm_vm_free(t.kvm_vm);
 }
 
+static void test_cmpxchg_key(void)
+{
+	struct test_default t = test_default_init(guest_copy_key);
+
+	HOST_SYNC(t.vcpu, STAGE_SKEYS_SET);
+
+	default_cmpxchg(&t, NO_KEY);
+	default_cmpxchg(&t, 0);
+	default_cmpxchg(&t, 9);
+
+	kvm_vm_free(t.kvm_vm);
+}
+
+static __uint128_t cut_to_size(int size, __uint128_t val)
+{
+	switch (size) {
+	case 1:
+		return (uint8_t)val;
+	case 2:
+		return (uint16_t)val;
+	case 4:
+		return (uint32_t)val;
+	case 8:
+		return (uint64_t)val;
+	case 16:
+		return val;
+	}
+	GUEST_ASSERT_1(false, "Invalid size");
+	return 0;
+}
+
+static bool popcount_eq(__uint128_t a, __uint128_t b)
+{
+	unsigned int count_a, count_b;
+
+	count_a = __builtin_popcountl((uint64_t)(a >> 64)) +
+		  __builtin_popcountl((uint64_t)a);
+	count_b = __builtin_popcountl((uint64_t)(b >> 64)) +
+		  __builtin_popcountl((uint64_t)b);
+	return count_a == count_b;
+}
+
+static __uint128_t rotate(int size, __uint128_t val, int amount)
+{
+	unsigned int bits = size * 8;
+
+	amount = (amount + bits) % bits;
+	val = cut_to_size(size, val);
+	return (val << (bits - amount)) | (val >> amount);
+}
+
+const unsigned int max_block = 16;
+
+static void choose_block(bool guest, int i, int *size, int *offset)
+{
+	unsigned int rand;
+
+	rand = i;
+	if (guest) {
+		rand = rand * 19 + 11;
+		*size = 1 << ((rand % 3) + 2);
+		rand = rand * 19 + 11;
+		*offset = (rand % max_block) & ~(*size - 1);
+	} else {
+		rand = rand * 17 + 5;
+		*size = 1 << (rand % 5);
+		rand = rand * 17 + 5;
+		*offset = (rand % max_block) & ~(*size - 1);
+	}
+}
+
+static __uint128_t permutate_bits(bool guest, int i, int size, __uint128_t old)
+{
+	unsigned int rand;
+	int amount;
+	bool swap;
+
+	rand = i;
+	rand = rand * 3 + 1;
+	if (guest)
+		rand = rand * 3 + 1;
+	swap = rand % 2 == 0;
+	if (swap) {
+		int i, j;
+		__uint128_t new;
+		uint8_t byte0, byte1;
+
+		rand = rand * 3 + 1;
+		i = rand % size;
+		rand = rand * 3 + 1;
+		j = rand % size;
+		if (i == j)
+			return old;
+		new = rotate(16, old, i * 8);
+		byte0 = new & 0xff;
+		new &= ~0xff;
+		new = rotate(16, new, -i * 8);
+		new = rotate(16, new, j * 8);
+		byte1 = new & 0xff;
+		new = (new & ~0xff) | byte0;
+		new = rotate(16, new, -j * 8);
+		new = rotate(16, new, i * 8);
+		new = new | byte1;
+		new = rotate(16, new, -i * 8);
+		return new;
+	}
+	rand = rand * 3 + 1;
+	amount = rand % (size * 8);
+	return rotate(size, old, amount);
+}
+
+static bool _cmpxchg(int size, void *target, __uint128_t *old_addr, __uint128_t new)
+{
+	bool ret;
+
+	switch (size) {
+	case 4: {
+			uint32_t old = *old_addr;
+
+			asm volatile ("cs %[old],%[new],%[address]"
+			    : [old] "+d" (old),
+			      [address] "+Q" (*(uint32_t *)(target))
+			    : [new] "d" ((uint32_t)new)
+			    : "cc"
+			);
+			ret = old == (uint32_t)*old_addr;
+			*old_addr = old;
+			return ret;
+		}
+	case 8: {
+			uint64_t old = *old_addr;
+
+			asm volatile ("csg %[old],%[new],%[address]"
+			    : [old] "+d" (old),
+			      [address] "+Q" (*(uint64_t *)(target))
+			    : [new] "d" ((uint64_t)new)
+			    : "cc"
+			);
+			ret = old == (uint64_t)*old_addr;
+			*old_addr = old;
+			return ret;
+		}
+	case 16: {
+			__uint128_t old = *old_addr;
+
+			asm volatile ("cdsg %[old],%[new],%[address]"
+			    : [old] "+d" (old),
+			      [address] "+Q" (*(__uint128_t *)(target))
+			    : [new] "d" (new)
+			    : "cc"
+			);
+			ret = old == *old_addr;
+			*old_addr = old;
+			return ret;
+		}
+	}
+	GUEST_ASSERT_1(false, "Invalid size");
+	return 0;
+}
+
+const unsigned int cmpxchg_iter_outer = 100, cmpxchg_iter_inner = 10000;
+
+static void guest_cmpxchg_key(void)
+{
+	int size, offset;
+	__uint128_t old, new;
+
+	set_storage_key_range(mem1, max_block, 0x10);
+	set_storage_key_range(mem2, max_block, 0x10);
+	GUEST_SYNC(STAGE_SKEYS_SET);
+
+	for (int i = 0; i < cmpxchg_iter_outer; i++) {
+		do {
+			old = 1;
+		} while (!_cmpxchg(16, mem1, &old, 0));
+		for (int j = 0; j < cmpxchg_iter_inner; j++) {
+			choose_block(true, i + j, &size, &offset);
+			do {
+				new = permutate_bits(true, i + j, size, old);
+			} while (!_cmpxchg(size, mem2 + offset, &old, new));
+		}
+	}
+
+	GUEST_SYNC(STAGE_DONE);
+}
+
+static void *run_guest(void *data)
+{
+	struct test_info *info = data;
+
+	HOST_SYNC(*info, STAGE_DONE);
+	return NULL;
+}
+
+static char *quad_to_char(__uint128_t *quad, int size)
+{
+	return ((char *)quad) + (sizeof(*quad) - size);
+}
+
+static void test_cmpxchg_key_concurrent(void)
+{
+	struct test_default t = test_default_init(guest_cmpxchg_key);
+	int size, offset;
+	__uint128_t old, new;
+	bool success;
+	pthread_t thread;
+
+	HOST_SYNC(t.vcpu, STAGE_SKEYS_SET);
+	prepare_mem12();
+	MOP(t.vcpu, LOGICAL, WRITE, mem1, max_block, GADDR_V(mem2));
+	pthread_create(&thread, NULL, run_guest, &t.vcpu);
+
+	for (int i = 0; i < cmpxchg_iter_outer; i++) {
+		do {
+			old = 0;
+			new = 1;
+			MOP(t.vm, ABSOLUTE, CMPXCHG, &new,
+			    sizeof(new), GADDR_V(mem1),
+			    CMPXCHG_OLD(&old),
+			    CMPXCHG_SUCCESS(&success), KEY(1));
+		} while (!success);
+		for (int j = 0; j < cmpxchg_iter_inner; j++) {
+			choose_block(false, i + j, &size, &offset);
+			do {
+				new = permutate_bits(false, i + j, size, old);
+				MOP(t.vm, ABSOLUTE, CMPXCHG, quad_to_char(&new, size),
+				    size, GADDR_V(mem2 + offset),
+				    CMPXCHG_OLD(quad_to_char(&old, size)),
+				    CMPXCHG_SUCCESS(&success), KEY(1));
+			} while (!success);
+		}
+	}
+
+	pthread_join(thread, NULL);
+
+	MOP(t.vcpu, LOGICAL, READ, mem2, max_block, GADDR_V(mem2));
+	TEST_ASSERT(popcount_eq(*(__uint128_t *)mem1, *(__uint128_t *)mem2),
+		    "Must retain number of set bits");
+
+	kvm_vm_free(t.kvm_vm);
+}
+
 static void guest_copy_key_fetch_prot(void)
 {
 	/*
@@ -457,6 +764,24 @@ static void test_errors_key(void)
 	kvm_vm_free(t.kvm_vm);
 }
 
+static void test_errors_cmpxchg_key(void)
+{
+	struct test_default t = test_default_init(guest_copy_key_fetch_prot);
+	int i;
+
+	HOST_SYNC(t.vcpu, STAGE_INITED);
+	HOST_SYNC(t.vcpu, STAGE_SKEYS_SET);
+
+	for (i = 1; i <= 16; i *= 2) {
+		__uint128_t old = 0;
+
+		ERR_PROT_MOP(t.vm, ABSOLUTE, CMPXCHG, mem2, i, GADDR_V(mem2),
+			     CMPXCHG_OLD(&old), KEY(2));
+	}
+
+	kvm_vm_free(t.kvm_vm);
+}
+
 static void test_termination(void)
 {
 	struct test_default t = test_default_init(guest_error_key);
@@ -692,6 +1017,38 @@ static void test_errors(void)
 	kvm_vm_free(t.kvm_vm);
 }
 
+static void test_errors_cmpxchg(void)
+{
+	struct test_default t = test_default_init(guest_idle);
+	__uint128_t old;
+	int rv, i, power = 1;
+
+	HOST_SYNC(t.vcpu, STAGE_INITED);
+
+	for (i = 0; i < 32; i++) {
+		if (i == power) {
+			power *= 2;
+			continue;
+		}
+		rv = ERR_MOP(t.vm, ABSOLUTE, CMPXCHG, mem1, i, GADDR_V(mem1),
+			     CMPXCHG_OLD(&old));
+		TEST_ASSERT(rv == -1 && errno == EINVAL,
+			    "ioctl allows bad size for cmpxchg");
+	}
+	for (i = 1; i <= 16; i *= 2) {
+		rv = ERR_MOP(t.vm, ABSOLUTE, CMPXCHG, mem1, i, GADDR((void *)~0xfffUL),
+			     CMPXCHG_OLD(&old));
+		TEST_ASSERT(rv > 0, "ioctl allows bad guest address for cmpxchg");
+	}
+	for (i = 2; i <= 16; i *= 2) {
+		rv = ERR_MOP(t.vm, ABSOLUTE, CMPXCHG, mem1, i, GADDR_V(mem1 + 1),
+			     CMPXCHG_OLD(&old));
+		TEST_ASSERT(rv == -1 && errno == EINVAL,
+			    "ioctl allows bad alignment for cmpxchg");
+	}
+
+	kvm_vm_free(t.kvm_vm);
+}
 
 int main(int argc, char *argv[])
 {
@@ -720,6 +1077,16 @@ int main(int argc, char *argv[])
 			.test = test_copy_key,
 			.requirements_met = extension_cap > 0,
 		},
+		{
+			.name = "cmpxchg with storage keys",
+			.test = test_cmpxchg_key,
+			.requirements_met = extension_cap & 0x2,
+		},
+		{
+			.name = "concurrently cmpxchg with storage keys",
+			.test = test_cmpxchg_key_concurrent,
+			.requirements_met = extension_cap & 0x2,
+		},
 		{
 			.name = "copy with key storage protection override",
 			.test = test_copy_key_storage_prot_override,
@@ -740,6 +1107,16 @@ int main(int argc, char *argv[])
 			.test = test_errors_key,
 			.requirements_met = extension_cap > 0,
 		},
+		{
+			.name = "error checks for cmpxchg with key",
+			.test = test_errors_cmpxchg_key,
+			.requirements_met = extension_cap & 0x2,
+		},
+		{
+			.name = "error checks for cmpxchg",
+			.test = test_errors_cmpxchg,
+			.requirements_met = extension_cap & 0x2,
+		},
 		{
 			.name = "termination",
 			.test = test_termination,
-- 
2.39.1

[GIT PULL 17/18] KVM: s390: GISA: sort out physical vs virtual pointers usage

[Janosch Frank]

From: Nico Boehr <nrb@linux.ibm.com>

Fix virtual vs physical address confusion (which currently are the same).

In chsc_sgib(), do the virtual-physical conversion in the caller since
the caller needs to make sure it is a 31-bit address and zero has a
special meaning (disassociating the GIB).

Signed-off-by: Nico Boehr <nrb@linux.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Reviewed-by: Michael Mueller <mimu@linux.ibm.com>
Link: https://lore.kernel.org/r/20221107085727.1533792-1-nrb@linux.ibm.com
Message-Id: <20221107085727.1533792-1-nrb@linux.ibm.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
---
 arch/s390/kvm/interrupt.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
index 1dae78deddf2..bbb280633cb8 100644
--- a/arch/s390/kvm/interrupt.c
+++ b/arch/s390/kvm/interrupt.c
@@ -3099,9 +3099,9 @@ static enum hrtimer_restart gisa_vcpu_kicker(struct hrtimer *timer)
 static void process_gib_alert_list(void)
 {
 	struct kvm_s390_gisa_interrupt *gi;
+	u32 final, gisa_phys, origin = 0UL;
 	struct kvm_s390_gisa *gisa;
 	struct kvm *kvm;
-	u32 final, origin = 0UL;
 
 	do {
 		/*
@@ -3127,9 +3127,10 @@ static void process_gib_alert_list(void)
 		 * interruptions asap.
 		 */
 		while (origin & GISA_ADDR_MASK) {
-			gisa = (struct kvm_s390_gisa *)(u64)origin;
+			gisa_phys = origin;
+			gisa = phys_to_virt(gisa_phys);
 			origin = gisa->next_alert;
-			gisa->next_alert = (u32)(u64)gisa;
+			gisa->next_alert = gisa_phys;
 			kvm = container_of(gisa, struct sie_page2, gisa)->kvm;
 			gi = &kvm->arch.gisa_int;
 			if (hrtimer_active(&gi->timer))
@@ -3413,6 +3414,7 @@ void kvm_s390_gib_destroy(void)
 
 int kvm_s390_gib_init(u8 nisc)
 {
+	u32 gib_origin;
 	int rc = 0;
 
 	if (!css_general_characteristics.aiv) {
@@ -3434,7 +3436,8 @@ int kvm_s390_gib_init(u8 nisc)
 	}
 
 	gib->nisc = nisc;
-	if (chsc_sgib((u32)(u64)gib)) {
+	gib_origin = virt_to_phys(gib);
+	if (chsc_sgib(gib_origin)) {
 		pr_err("Associating the GIB with the AIV facility failed\n");
 		free_page((unsigned long)gib);
 		gib = NULL;
-- 
2.39.1

[GIT PULL 18/18] s390/virtio: sort out physical vs virtual pointers usage

[Janosch Frank]

From: Alexander Gordeev <agordeev@linux.ibm.com>

This does not fix a real bug, since virtual addresses
are currently indentical to physical ones.

Reviewed-by: Nico Boehr <nrb@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
---
 drivers/s390/virtio/virtio_ccw.c | 46 +++++++++++++++++---------------
 1 file changed, 24 insertions(+), 22 deletions(-)

diff --git a/drivers/s390/virtio/virtio_ccw.c b/drivers/s390/virtio/virtio_ccw.c
index a10dbe632ef9..954fc31b4bc7 100644
--- a/drivers/s390/virtio/virtio_ccw.c
+++ b/drivers/s390/virtio/virtio_ccw.c
@@ -363,7 +363,7 @@ static void virtio_ccw_drop_indicator(struct virtio_ccw_device *vcdev,
 		thinint_area->isc = VIRTIO_AIRQ_ISC;
 		ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER;
 		ccw->count = sizeof(*thinint_area);
-		ccw->cda = (__u32)(unsigned long) thinint_area;
+		ccw->cda = (__u32)virt_to_phys(thinint_area);
 	} else {
 		/* payload is the address of the indicators */
 		indicatorp = ccw_device_dma_zalloc(vcdev->cdev,
@@ -373,7 +373,7 @@ static void virtio_ccw_drop_indicator(struct virtio_ccw_device *vcdev,
 		*indicatorp = 0;
 		ccw->cmd_code = CCW_CMD_SET_IND;
 		ccw->count = sizeof(indicators(vcdev));
-		ccw->cda = (__u32)(unsigned long) indicatorp;
+		ccw->cda = (__u32)virt_to_phys(indicatorp);
 	}
 	/* Deregister indicators from host. */
 	*indicators(vcdev) = 0;
@@ -417,7 +417,7 @@ static int virtio_ccw_read_vq_conf(struct virtio_ccw_device *vcdev,
 	ccw->cmd_code = CCW_CMD_READ_VQ_CONF;
 	ccw->flags = 0;
 	ccw->count = sizeof(struct vq_config_block);
-	ccw->cda = (__u32)(unsigned long)(&vcdev->dma_area->config_block);
+	ccw->cda = (__u32)virt_to_phys(&vcdev->dma_area->config_block);
 	ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_VQ_CONF);
 	if (ret)
 		return ret;
@@ -454,7 +454,7 @@ static void virtio_ccw_del_vq(struct virtqueue *vq, struct ccw1 *ccw)
 	}
 	ccw->cmd_code = CCW_CMD_SET_VQ;
 	ccw->flags = 0;
-	ccw->cda = (__u32)(unsigned long)(info->info_block);
+	ccw->cda = (__u32)virt_to_phys(info->info_block);
 	ret = ccw_io_helper(vcdev, ccw,
 			    VIRTIO_CCW_DOING_SET_VQ | index);
 	/*
@@ -556,7 +556,7 @@ static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev,
 	}
 	ccw->cmd_code = CCW_CMD_SET_VQ;
 	ccw->flags = 0;
-	ccw->cda = (__u32)(unsigned long)(info->info_block);
+	ccw->cda = (__u32)virt_to_phys(info->info_block);
 	err = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_VQ | i);
 	if (err) {
 		dev_warn(&vcdev->cdev->dev, "SET_VQ failed\n");
@@ -590,6 +590,7 @@ static int virtio_ccw_register_adapter_ind(struct virtio_ccw_device *vcdev,
 {
 	int ret;
 	struct virtio_thinint_area *thinint_area = NULL;
+	unsigned long indicator_addr;
 	struct airq_info *info;
 
 	thinint_area = ccw_device_dma_zalloc(vcdev->cdev,
@@ -599,21 +600,22 @@ static int virtio_ccw_register_adapter_ind(struct virtio_ccw_device *vcdev,
 		goto out;
 	}
 	/* Try to get an indicator. */
-	thinint_area->indicator = get_airq_indicator(vqs, nvqs,
-						     &thinint_area->bit_nr,
-						     &vcdev->airq_info);
-	if (!thinint_area->indicator) {
+	indicator_addr = get_airq_indicator(vqs, nvqs,
+					    &thinint_area->bit_nr,
+					    &vcdev->airq_info);
+	if (!indicator_addr) {
 		ret = -ENOSPC;
 		goto out;
 	}
+	thinint_area->indicator = virt_to_phys((void *)indicator_addr);
 	info = vcdev->airq_info;
 	thinint_area->summary_indicator =
-		(unsigned long) get_summary_indicator(info);
+		virt_to_phys(get_summary_indicator(info));
 	thinint_area->isc = VIRTIO_AIRQ_ISC;
 	ccw->cmd_code = CCW_CMD_SET_IND_ADAPTER;
 	ccw->flags = CCW_FLAG_SLI;
 	ccw->count = sizeof(*thinint_area);
-	ccw->cda = (__u32)(unsigned long)thinint_area;
+	ccw->cda = (__u32)virt_to_phys(thinint_area);
 	ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND_ADAPTER);
 	if (ret) {
 		if (ret == -EOPNOTSUPP) {
@@ -686,7 +688,7 @@ static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs,
 		ccw->cmd_code = CCW_CMD_SET_IND;
 		ccw->flags = 0;
 		ccw->count = sizeof(indicators(vcdev));
-		ccw->cda = (__u32)(unsigned long) indicatorp;
+		ccw->cda = (__u32)virt_to_phys(indicatorp);
 		ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND);
 		if (ret)
 			goto out;
@@ -697,7 +699,7 @@ static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs,
 	ccw->cmd_code = CCW_CMD_SET_CONF_IND;
 	ccw->flags = 0;
 	ccw->count = sizeof(indicators2(vcdev));
-	ccw->cda = (__u32)(unsigned long) indicatorp;
+	ccw->cda = (__u32)virt_to_phys(indicatorp);
 	ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_CONF_IND);
 	if (ret)
 		goto out;
@@ -759,7 +761,7 @@ static u64 virtio_ccw_get_features(struct virtio_device *vdev)
 	ccw->cmd_code = CCW_CMD_READ_FEAT;
 	ccw->flags = 0;
 	ccw->count = sizeof(*features);
-	ccw->cda = (__u32)(unsigned long)features;
+	ccw->cda = (__u32)virt_to_phys(features);
 	ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT);
 	if (ret) {
 		rc = 0;
@@ -776,7 +778,7 @@ static u64 virtio_ccw_get_features(struct virtio_device *vdev)
 	ccw->cmd_code = CCW_CMD_READ_FEAT;
 	ccw->flags = 0;
 	ccw->count = sizeof(*features);
-	ccw->cda = (__u32)(unsigned long)features;
+	ccw->cda = (__u32)virt_to_phys(features);
 	ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT);
 	if (ret == 0)
 		rc |= (u64)le32_to_cpu(features->features) << 32;
@@ -829,7 +831,7 @@ static int virtio_ccw_finalize_features(struct virtio_device *vdev)
 	ccw->cmd_code = CCW_CMD_WRITE_FEAT;
 	ccw->flags = 0;
 	ccw->count = sizeof(*features);
-	ccw->cda = (__u32)(unsigned long)features;
+	ccw->cda = (__u32)virt_to_phys(features);
 	ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT);
 	if (ret)
 		goto out_free;
@@ -843,7 +845,7 @@ static int virtio_ccw_finalize_features(struct virtio_device *vdev)
 	ccw->cmd_code = CCW_CMD_WRITE_FEAT;
 	ccw->flags = 0;
 	ccw->count = sizeof(*features);
-	ccw->cda = (__u32)(unsigned long)features;
+	ccw->cda = (__u32)virt_to_phys(features);
 	ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT);
 
 out_free:
@@ -875,7 +877,7 @@ static void virtio_ccw_get_config(struct virtio_device *vdev,
 	ccw->cmd_code = CCW_CMD_READ_CONF;
 	ccw->flags = 0;
 	ccw->count = offset + len;
-	ccw->cda = (__u32)(unsigned long)config_area;
+	ccw->cda = (__u32)virt_to_phys(config_area);
 	ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_CONFIG);
 	if (ret)
 		goto out_free;
@@ -922,7 +924,7 @@ static void virtio_ccw_set_config(struct virtio_device *vdev,
 	ccw->cmd_code = CCW_CMD_WRITE_CONF;
 	ccw->flags = 0;
 	ccw->count = offset + len;
-	ccw->cda = (__u32)(unsigned long)config_area;
+	ccw->cda = (__u32)virt_to_phys(config_area);
 	ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_CONFIG);
 
 out_free:
@@ -946,7 +948,7 @@ static u8 virtio_ccw_get_status(struct virtio_device *vdev)
 	ccw->cmd_code = CCW_CMD_READ_STATUS;
 	ccw->flags = 0;
 	ccw->count = sizeof(vcdev->dma_area->status);
-	ccw->cda = (__u32)(unsigned long)&vcdev->dma_area->status;
+	ccw->cda = (__u32)virt_to_phys(&vcdev->dma_area->status);
 	ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_STATUS);
 /*
  * If the channel program failed (should only happen if the device
@@ -975,7 +977,7 @@ static void virtio_ccw_set_status(struct virtio_device *vdev, u8 status)
 	ccw->cmd_code = CCW_CMD_WRITE_STATUS;
 	ccw->flags = 0;
 	ccw->count = sizeof(status);
-	ccw->cda = (__u32)(unsigned long)&vcdev->dma_area->status;
+	ccw->cda = (__u32)virt_to_phys(&vcdev->dma_area->status);
 	/* We use ssch for setting the status which is a serializing
 	 * instruction that guarantees the memory writes have
 	 * completed before ssch.
@@ -1274,7 +1276,7 @@ static int virtio_ccw_set_transport_rev(struct virtio_ccw_device *vcdev)
 	ccw->cmd_code = CCW_CMD_SET_VIRTIO_REV;
 	ccw->flags = 0;
 	ccw->count = sizeof(*rev);
-	ccw->cda = (__u32)(unsigned long)rev;
+	ccw->cda = (__u32)virt_to_phys(rev);
 
 	vcdev->revision = VIRTIO_CCW_REV_MAX;
 	do {
-- 
2.39.1

Re: [GIT PULL 00/18] KVM: s390x: KVM s390x changes for 6.3

[Paolo Bonzini]

On Thu, Feb 9, 2023 at 11:25 AM Janosch Frank <frankja@linux.ibm.com> wrote:
>
> Hi Paolo,
>
> the following changes are ready for pulling for 6.3:
> * Two more V!=R patches
> * The last part of the cmpxchg patches
> * A few fixes
>
> This pull includes the s390 cmpxchg_user_key feature branch which is
> the base for the KVM cmpxchg patches by Janis.

Pulled, thanks,

Paolo

> Cheers,
> Janosch
>
> The following changes since commit a2ce98d69fabc7d3758063366fe830f682610cf7:
>
>   Merge remote-tracking branch 'l390-korg/cmpxchg_user_key' into kvm-next (2023-02-07 18:04:23 +0100)
>
> are available in the Git repository at:
>
>   https://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux.git tags/kvm-s390-next-6.3-1
>
> for you to fetch changes up to 5fc5b94a273655128159186c87662105db8afeb5:
>
>   s390/virtio: sort out physical vs virtual pointers usage (2023-02-08 09:59:46 +0100)
>
> ----------------------------------------------------------------
>
> Alexander Gordeev (1):
>   s390/virtio: sort out physical vs virtual pointers usage
>
> Janis Schoetterl-Glausch (14):
>   KVM: s390: selftest: memop: Pass mop_desc via pointer
>   KVM: s390: selftest: memop: Replace macros by functions
>   KVM: s390: selftest: memop: Move testlist into main
>   KVM: s390: selftest: memop: Add bad address test
>   KVM: s390: selftest: memop: Fix typo
>   KVM: s390: selftest: memop: Fix wrong address being used in test
>   KVM: s390: selftest: memop: Fix integer literal
>   KVM: s390: Move common code of mem_op functions into function
>   KVM: s390: Dispatch to implementing function at top level of vm mem_op
>   KVM: s390: Refactor absolute vm mem_op function
>   KVM: s390: Refactor vcpu mem_op function
>   KVM: s390: Extend MEM_OP ioctl by storage key checked cmpxchg
>   Documentation: KVM: s390: Describe KVM_S390_MEMOP_F_CMPXCHG
>   KVM: s390: selftest: memop: Add cmpxchg tests
>
> Nico Boehr (2):
>   KVM: s390: disable migration mode when dirty tracking is disabled
>   KVM: s390: GISA: sort out physical vs virtual pointers usage
>
> Nina Schoetterl-Glausch (1):
>   KVM: selftests: Compile s390 tests with -march=z10
>
>  Documentation/virt/kvm/api.rst            |  46 +-
>  Documentation/virt/kvm/devices/vm.rst     |   4 +
>  arch/s390/kvm/gaccess.c                   | 109 ++++
>  arch/s390/kvm/gaccess.h                   |   3 +
>  arch/s390/kvm/interrupt.c                 |  11 +-
>  arch/s390/kvm/kvm-s390.c                  | 268 +++++----
>  drivers/s390/virtio/virtio_ccw.c          |  46 +-
>  include/uapi/linux/kvm.h                  |   8 +
>  tools/testing/selftests/kvm/Makefile      |   3 +
>  tools/testing/selftests/kvm/s390x/memop.c | 676 +++++++++++++++++-----
>  10 files changed, 889 insertions(+), 285 deletions(-)
>
> --
> 2.39.1
>