From: Jinrong Liang cloudliang@tencent.com
Add tests to cover that pmu event_filter works as expected when it's applied to fixed performance counters, even if there is none fixed counter exists (e.g. Intel guest pmu version=1 or AMD guest).
Signed-off-by: Jinrong Liang cloudliang@tencent.com --- .../kvm/x86_64/pmu_event_filter_test.c | 81 +++++++++++++++++++ 1 file changed, 81 insertions(+)
diff --git a/tools/testing/selftests/kvm/x86_64/pmu_event_filter_test.c b/tools/testing/selftests/kvm/x86_64/pmu_event_filter_test.c index 7555e0f4290c..72f7fdb821e5 100644 --- a/tools/testing/selftests/kvm/x86_64/pmu_event_filter_test.c +++ b/tools/testing/selftests/kvm/x86_64/pmu_event_filter_test.c @@ -824,6 +824,86 @@ static void test_filter_ioctl(struct kvm_vcpu *vcpu) "Setting invalid or non-exist fixed cunters in the fixed bitmap fail."); }
+static void intel_run_fixed_counter_guest_code(uint8_t fixed_ctr_idx) +{ + for (;;) { + wrmsr(MSR_CORE_PERF_GLOBAL_CTRL, 0); + wrmsr(MSR_CORE_PERF_FIXED_CTR0 + fixed_ctr_idx, 0); + + /* Only OS_EN bit is enabled for fixed counter[idx]. */ + wrmsr(MSR_CORE_PERF_FIXED_CTR_CTRL, BIT_ULL(4 * fixed_ctr_idx)); + wrmsr(MSR_CORE_PERF_GLOBAL_CTRL, + BIT_ULL(INTEL_PMC_IDX_FIXED + fixed_ctr_idx)); + __asm__ __volatile__("loop ." : "+c"((int){NUM_BRANCHES})); + wrmsr(MSR_CORE_PERF_GLOBAL_CTRL, 0); + + GUEST_SYNC(rdmsr(MSR_CORE_PERF_FIXED_CTR0 + fixed_ctr_idx)); + } +} + +static uint64_t test_with_fixed_counter_filter(struct kvm_vcpu *vcpu, + uint32_t action, uint32_t bitmap) +{ + struct __kvm_pmu_event_filter f = { + .action = action, + .fixed_counter_bitmap = bitmap, + }; + do_vcpu_set_pmu_event_filter(vcpu, &f); + + return run_vcpu_to_sync(vcpu); +} + +static void __test_fixed_counter_bitmap(struct kvm_vcpu *vcpu, uint8_t idx, + uint8_t nr_fixed_counters) +{ + unsigned int i; + uint32_t bitmap; + uint64_t count; + + TEST_ASSERT(nr_fixed_counters < sizeof(bitmap), + "Invalid nr_fixed_counters"); + + /* + * Check the fixed performance counter can count normally works when + * KVM userspace doesn't set any pmu filter. + */ + TEST_ASSERT(run_vcpu_to_sync(vcpu), + "Fixed counter does not exist or does not work as expected."); + + for (i = 0; i < BIT(nr_fixed_counters); i++) { + bitmap = BIT(i); + count = test_with_fixed_counter_filter(vcpu, KVM_PMU_EVENT_ALLOW, + bitmap); + TEST_ASSERT(!!count == !!(bitmap & BIT(idx)), + "Fixed event filter does not work as expected."); + + count = test_with_fixed_counter_filter(vcpu, KVM_PMU_EVENT_DENY, + bitmap); + TEST_ASSERT(!!count == !(bitmap & BIT(idx)), + "Fixed event filter does not work as expected."); + } +} + +static void test_fixed_counter_bitmap(void) +{ + struct kvm_vm *vm; + struct kvm_vcpu *vcpu; + uint8_t idx; + + /* + * Check that pmu_event_filter works as expected when it's applied to + * fixed performance counters. + */ + for (idx = 0; idx < X86_INTEL_MAX_FIXED_CTR_NUM; idx++) { + vm = vm_create_with_one_vcpu(&vcpu, + intel_run_fixed_counter_guest_code); + vcpu_args_set(vcpu, 1, idx); + __test_fixed_counter_bitmap(vcpu, idx, + X86_INTEL_MAX_FIXED_CTR_NUM); + kvm_vm_free(vm); + } +} + int main(int argc, char *argv[]) { void (*guest_code)(void); @@ -867,6 +947,7 @@ int main(int argc, char *argv[]) kvm_vm_free(vm);
test_pmu_config_disable(guest_code); + test_fixed_counter_bitmap();
return 0; }