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Reply-To: Sean Christopherson <seanjc@google.com>
Date:   Fri, 11 Mar 2022 05:49:23 +0000
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Subject: [RFC PATCH 012/105] KVM: selftests: Add vcpu_get() to retrieve and
 assert on vCPU existence
From:   Sean Christopherson <seanjc@google.com>
To:     linux-kernel@vger.kernel.org
Cc:     Sean Christopherson <seanjc@google.com>
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

Signed-off-by: Sean Christopherson <seanjc@google.com>
---
 tools/testing/selftests/kvm/lib/kvm_util.c    | 56 ++++++-------------
 .../selftests/kvm/lib/kvm_util_internal.h     |  2 +-
 .../selftests/kvm/lib/s390x/processor.c       |  5 +-
 .../selftests/kvm/lib/x86_64/processor.c      |  6 +-
 4 files changed, 21 insertions(+), 48 deletions(-)

diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
index 52fefa51071a..d45f2ec7b13e 100644
--- a/tools/testing/selftests/kvm/lib/kvm_util.c
+++ b/tools/testing/selftests/kvm/lib/kvm_util.c
@@ -553,23 +553,7 @@ kvm_userspace_memory_region_find(struct kvm_vm *vm, uint64_t start,
 	return &region->region;
 }
 
-/*
- * VCPU Find
- *
- * Input Args:
- *   vm - Virtual Machine
- *   vcpuid - VCPU ID
- *
- * Output Args: None
- *
- * Return:
- *   Pointer to VCPU structure
- *
- * Locates a vcpu structure that describes the VCPU specified by vcpuid and
- * returns a pointer to it.  Returns NULL if the VM doesn't contain a VCPU
- * for the specified vcpuid.
- */
-struct vcpu *vcpu_find(struct kvm_vm *vm, uint32_t vcpuid)
+static struct vcpu *vcpu_find(struct kvm_vm *vm, uint32_t vcpuid)
 {
 	struct vcpu *vcpu;
 
@@ -581,6 +565,14 @@ struct vcpu *vcpu_find(struct kvm_vm *vm, uint32_t vcpuid)
 	return NULL;
 }
 
+struct vcpu *vcpu_get(struct kvm_vm *vm, uint32_t vcpuid)
+{
+	struct vcpu *vcpu = vcpu_find(vm, vcpuid);
+
+	TEST_ASSERT(vcpu, "vCPU %d does not exist", vcpuid);
+	return vcpu;
+}
+
 /*
  * VM VCPU Remove
  *
@@ -1530,8 +1522,7 @@ void vm_create_irqchip(struct kvm_vm *vm)
  */
 struct kvm_run *vcpu_state(struct kvm_vm *vm, uint32_t vcpuid)
 {
-	struct vcpu *vcpu = vcpu_find(vm, vcpuid);
-	TEST_ASSERT(vcpu != NULL, "vcpu not found, vcpuid: %u", vcpuid);
+	struct vcpu *vcpu = vcpu_get(vm, vcpuid);
 
 	return vcpu->state;
 }
@@ -1572,11 +1563,9 @@ int _vcpu_run(struct kvm_vm *vm, uint32_t vcpuid)
 
 void vcpu_run_complete_io(struct kvm_vm *vm, uint32_t vcpuid)
 {
-	struct vcpu *vcpu = vcpu_find(vm, vcpuid);
+	struct vcpu *vcpu = vcpu_get(vm, vcpuid);
 	int ret;
 
-	TEST_ASSERT(vcpu != NULL, "vcpu not found, vcpuid: %u", vcpuid);
-
 	vcpu->state->immediate_exit = 1;
 	ret = __vcpu_run(vm, vcpuid);
 	vcpu->state->immediate_exit = 0;
@@ -1618,14 +1607,9 @@ struct kvm_reg_list *vcpu_get_reg_list(struct kvm_vm *vm, uint32_t vcpuid)
 int __vcpu_ioctl(struct kvm_vm *vm, uint32_t vcpuid,
 		 unsigned long cmd, void *arg)
 {
-	struct vcpu *vcpu = vcpu_find(vm, vcpuid);
-	int ret;
+	struct vcpu *vcpu = vcpu_get(vm, vcpuid);
 
-	TEST_ASSERT(vcpu != NULL, "vcpu not found, vcpuid: %u", vcpuid);
-
-	ret = ioctl(vcpu->fd, cmd, arg);
-
-	return ret;
+	return ioctl(vcpu->fd, cmd, arg);
 }
 
 void _vcpu_ioctl(struct kvm_vm *vm, uint32_t vcpuid, unsigned long cmd,
@@ -1638,15 +1622,11 @@ void _vcpu_ioctl(struct kvm_vm *vm, uint32_t vcpuid, unsigned long cmd,
 
 void *vcpu_map_dirty_ring(struct kvm_vm *vm, uint32_t vcpuid)
 {
-	struct vcpu *vcpu;
+	struct vcpu *vcpu = vcpu_get(vm, vcpuid);
 	uint32_t size = vm->dirty_ring_size;
 
 	TEST_ASSERT(size > 0, "Should enable dirty ring first");
 
-	vcpu = vcpu_find(vm, vcpuid);
-
-	TEST_ASSERT(vcpu, "Cannot find vcpu %u", vcpuid);
-
 	if (!vcpu->dirty_gfns) {
 		void *addr;
 
@@ -1802,9 +1782,7 @@ int kvm_device_access(int dev_fd, uint32_t group, uint64_t attr,
 int _vcpu_has_device_attr(struct kvm_vm *vm, uint32_t vcpuid, uint32_t group,
 			  uint64_t attr)
 {
-	struct vcpu *vcpu = vcpu_find(vm, vcpuid);
-
-	TEST_ASSERT(vcpu, "nonexistent vcpu id: %d", vcpuid);
+	struct vcpu *vcpu = vcpu_get(vm, vcpuid);
 
 	return _kvm_device_check_attr(vcpu->fd, group, attr);
 }
@@ -1821,9 +1799,7 @@ int vcpu_has_device_attr(struct kvm_vm *vm, uint32_t vcpuid, uint32_t group,
 int _vcpu_access_device_attr(struct kvm_vm *vm, uint32_t vcpuid, uint32_t group,
 			     uint64_t attr, void *val, bool write)
 {
-	struct vcpu *vcpu = vcpu_find(vm, vcpuid);
-
-	TEST_ASSERT(vcpu, "nonexistent vcpu id: %d", vcpuid);
+	struct vcpu *vcpu = vcpu_get(vm, vcpuid);
 
 	return _kvm_device_access(vcpu->fd, group, attr, val, write);
 }
diff --git a/tools/testing/selftests/kvm/lib/kvm_util_internal.h b/tools/testing/selftests/kvm/lib/kvm_util_internal.h
index a03febc24ba6..0c7c44499129 100644
--- a/tools/testing/selftests/kvm/lib/kvm_util_internal.h
+++ b/tools/testing/selftests/kvm/lib/kvm_util_internal.h
@@ -69,7 +69,7 @@ struct kvm_vm {
 	uint32_t dirty_ring_size;
 };
 
-struct vcpu *vcpu_find(struct kvm_vm *vm, uint32_t vcpuid);
+struct vcpu *vcpu_get(struct kvm_vm *vm, uint32_t vcpuid);
 
 /*
  * Virtual Translation Tables Dump
diff --git a/tools/testing/selftests/kvm/lib/s390x/processor.c b/tools/testing/selftests/kvm/lib/s390x/processor.c
index f87c7137598e..7cc1051c4b71 100644
--- a/tools/testing/selftests/kvm/lib/s390x/processor.c
+++ b/tools/testing/selftests/kvm/lib/s390x/processor.c
@@ -208,10 +208,7 @@ void vcpu_args_set(struct kvm_vm *vm, uint32_t vcpuid, unsigned int num, ...)
 
 void vcpu_dump(FILE *stream, struct kvm_vm *vm, uint32_t vcpuid, uint8_t indent)
 {
-	struct vcpu *vcpu = vcpu_find(vm, vcpuid);
-
-	if (!vcpu)
-		return;
+	struct vcpu *vcpu = vcpu_get(vm, vcpuid);
 
 	fprintf(stream, "%*spstate: psw: 0x%.16llx:0x%.16llx\n",
 		indent, "", vcpu->state->psw_mask, vcpu->state->psw_addr);
diff --git a/tools/testing/selftests/kvm/lib/x86_64/processor.c b/tools/testing/selftests/kvm/lib/x86_64/processor.c
index fb05bed7ec1e..4065fc4daada 100644
--- a/tools/testing/selftests/kvm/lib/x86_64/processor.c
+++ b/tools/testing/selftests/kvm/lib/x86_64/processor.c
@@ -841,7 +841,7 @@ uint64_t kvm_get_feature_msr(uint64_t msr_index)
  */
 struct kvm_cpuid2 *vcpu_get_cpuid(struct kvm_vm *vm, uint32_t vcpuid)
 {
-	struct vcpu *vcpu = vcpu_find(vm, vcpuid);
+	struct vcpu *vcpu = vcpu_get(vm, vcpuid);
 	struct kvm_cpuid2 *cpuid;
 	int max_ent;
 	int rc = -1;
@@ -1039,7 +1039,7 @@ static int vcpu_save_xsave_state(struct kvm_vm *vm, struct vcpu *vcpu,
 
 struct kvm_x86_state *vcpu_save_state(struct kvm_vm *vm, uint32_t vcpuid)
 {
-	struct vcpu *vcpu = vcpu_find(vm, vcpuid);
+	struct vcpu *vcpu = vcpu_get(vm, vcpuid);
 	struct kvm_msr_list *list;
 	struct kvm_x86_state *state;
 	int nmsrs, r, i;
@@ -1122,7 +1122,7 @@ struct kvm_x86_state *vcpu_save_state(struct kvm_vm *vm, uint32_t vcpuid)
 
 void vcpu_load_state(struct kvm_vm *vm, uint32_t vcpuid, struct kvm_x86_state *state)
 {
-	struct vcpu *vcpu = vcpu_find(vm, vcpuid);
+	struct vcpu *vcpu = vcpu_get(vm, vcpuid);
 	int r;
 
 	r = ioctl(vcpu->fd, KVM_SET_SREGS, &state->sregs);
-- 
2.35.1.723.g4982287a31-goog