[v4,36/38] KVM: selftests: Add mediated vPMU supported for pmu tests

Commit Message

Mingwei Zhang March 24, 2025, 5:31 p.m. UTC

From: Dapeng Mi <[e-mail]>

Mediated vPMU needs to call KVM_CAP_PMU_CAPABILITY ioctl to enable it.
Thus add a helper vm_create_with_one_vcpu_with_pmu() to create PMU
enabled VM and replace vm_create_with_one_vcpu() helper with this new
helper in pmu tests.

Signed-off-by: Dapeng Mi <[e-mail]>
Signed-off-by: Mingwei Zhang <[e-mail]>
---
 .../testing/selftests/kvm/include/kvm_util.h  |  3 +++
 tools/testing/selftests/kvm/lib/kvm_util.c    | 23 +++++++++++++++++++
 .../selftests/kvm/x86/pmu_counters_test.c     |  4 +++-
 .../selftests/kvm/x86/pmu_event_filter_test.c |  8 ++++---
 4 files changed, 34 insertions(+), 4 deletions(-)

Patch

diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h
index 4c4e5a847f67..a73b0b98be5e 100644
--- a/tools/testing/selftests/kvm/include/kvm_util.h
+++ b/tools/testing/selftests/kvm/include/kvm_util.h
@@ -961,6 +961,9 @@  static inline struct kvm_vm *vm_create_shape_with_one_vcpu(struct vm_shape shape
 	return __vm_create_shape_with_one_vcpu(shape, vcpu, 0, guest_code);
 }
 
+struct kvm_vm *vm_create_with_one_vcpu_with_pmu(struct kvm_vcpu **vcpu,
+						void *guest_code);
+
 struct kvm_vcpu *vm_recreate_with_one_vcpu(struct kvm_vm *vm);
 
 void kvm_pin_this_task_to_pcpu(uint32_t pcpu);
diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
index 33fefeb3ca44..18143ec2e751 100644
--- a/tools/testing/selftests/kvm/lib/kvm_util.c
+++ b/tools/testing/selftests/kvm/lib/kvm_util.c
@@ -545,6 +545,29 @@  struct kvm_vcpu *vm_recreate_with_one_vcpu(struct kvm_vm *vm)
 	return vm_vcpu_recreate(vm, 0);
 }
 
+struct kvm_vm *vm_create_with_one_vcpu_with_pmu(struct kvm_vcpu **vcpu,
+						void *guest_code)
+{
+	struct kvm_vm *vm;
+	int r;
+
+	r = kvm_check_cap(KVM_CAP_PMU_CAPABILITY);
+	if (!(r & KVM_PMU_CAP_DISABLE))
+		return NULL;
+
+	vm = vm_create(1);
+
+	/*
+	 * KVM_CAP_PMU_CAPABILITY ioctl must be explicitly called to enable
+	 * mediated vPMU.
+	 */
+	vm_enable_cap(vm, KVM_CAP_PMU_CAPABILITY, !KVM_PMU_CAP_DISABLE);
+
+	*vcpu = vm_vcpu_add(vm, 0, guest_code);
+
+	return vm;
+}
+
 void kvm_pin_this_task_to_pcpu(uint32_t pcpu)
 {
 	cpu_set_t mask;
diff --git a/tools/testing/selftests/kvm/x86/pmu_counters_test.c b/tools/testing/selftests/kvm/x86/pmu_counters_test.c
index 698cb36989db..441c66f314fb 100644
--- a/tools/testing/selftests/kvm/x86/pmu_counters_test.c
+++ b/tools/testing/selftests/kvm/x86/pmu_counters_test.c
@@ -40,7 +40,9 @@  static struct kvm_vm *pmu_vm_create_with_one_vcpu(struct kvm_vcpu **vcpu,
 {
 	struct kvm_vm *vm;
 
-	vm = vm_create_with_one_vcpu(vcpu, guest_code);
+	vm = vm_create_with_one_vcpu_with_pmu(vcpu, guest_code);
+	assert(vm);
+
 	sync_global_to_guest(vm, kvm_pmu_version);
 
 	/*
diff --git a/tools/testing/selftests/kvm/x86/pmu_event_filter_test.c b/tools/testing/selftests/kvm/x86/pmu_event_filter_test.c
index c15513cd74d1..1c7d265a0003 100644
--- a/tools/testing/selftests/kvm/x86/pmu_event_filter_test.c
+++ b/tools/testing/selftests/kvm/x86/pmu_event_filter_test.c
@@ -822,8 +822,9 @@  static void test_fixed_counter_bitmap(void)
 	 * fixed performance counters.
 	 */
 	for (idx = 0; idx < nr_fixed_counters; idx++) {
-		vm = vm_create_with_one_vcpu(&vcpu,
-					     intel_run_fixed_counter_guest_code);
+		vm = vm_create_with_one_vcpu_with_pmu(&vcpu,
+						      intel_run_fixed_counter_guest_code);
+		assert(vm);
 		vcpu_args_set(vcpu, 1, idx);
 		__test_fixed_counter_bitmap(vcpu, idx, nr_fixed_counters);
 		kvm_vm_free(vm);
@@ -843,7 +844,8 @@  int main(int argc, char *argv[])
 	TEST_REQUIRE(use_intel_pmu() || use_amd_pmu());
 	guest_code = use_intel_pmu() ? intel_guest_code : amd_guest_code;
 
-	vm = vm_create_with_one_vcpu(&vcpu, guest_code);
+	vm = vm_create_with_one_vcpu_with_pmu(&vcpu, guest_code);
+	assert(vm);
 
 	TEST_REQUIRE(sanity_check_pmu(vcpu));