linux-kernel - [PATCH v3 10/11] KVM: selftests: Test AMD PMU events on legacy four performance counters

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Date:   Mon, 14 Aug 2023 19:51:07 +0800
From:   Jinrong Liang <ljr.kernel@...il.com>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>, Like Xu <likexu@...cent.com>,
        David Matlack <dmatlack@...gle.com>,
        Aaron Lewis <aaronlewis@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jinrong Liang <cloudliang@...cent.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v3 10/11] KVM: selftests: Test AMD PMU events on legacy four performance counters

From: Jinrong Liang <cloudliang@...cent.com>

Add tests to check AMD PMU legacy four performance counters.

Signed-off-by: Jinrong Liang <cloudliang@...cent.com>
---
 .../kvm/x86_64/pmu_basic_functionality_test.c | 72 ++++++++++++++-----
 1 file changed, 54 insertions(+), 18 deletions(-)

diff --git a/tools/testing/selftests/kvm/x86_64/pmu_basic_functionality_test.c b/tools/testing/selftests/kvm/x86_64/pmu_basic_functionality_test.c
index 70adfad45010..cb2a7ad5c504 100644
--- a/tools/testing/selftests/kvm/x86_64/pmu_basic_functionality_test.c
+++ b/tools/testing/selftests/kvm/x86_64/pmu_basic_functionality_test.c
@@ -58,20 +58,29 @@ static uint64_t run_vcpu(struct kvm_vcpu *vcpu, uint64_t *ucall_arg)
 
 static void guest_measure_loop(uint64_t event_code)
 {
-	uint32_t nr_fixed_counter = this_cpu_property(X86_PROPERTY_PMU_NR_FIXED_COUNTERS);
-	uint32_t nr_gp_counters = this_cpu_property(X86_PROPERTY_PMU_NR_GP_COUNTERS);
-	uint32_t pmu_version = this_cpu_property(X86_PROPERTY_PMU_VERSION);
+	uint8_t nr_gp_counters, pmu_version = 1;
+	uint64_t event_sel_msr;
 	uint32_t counter_msr;
 	unsigned int i;
 
-	if (rdmsr(MSR_IA32_PERF_CAPABILITIES) & PMU_CAP_FW_WRITES)
-		counter_msr = MSR_IA32_PMC0;
-	else
-		counter_msr = MSR_IA32_PERFCTR0;
+	if (host_cpu_is_intel) {
+		nr_gp_counters = this_cpu_property(X86_PROPERTY_PMU_NR_GP_COUNTERS);
+		pmu_version = this_cpu_property(X86_PROPERTY_PMU_VERSION);
+		event_sel_msr = MSR_P6_EVNTSEL0;
+
+		if (rdmsr(MSR_IA32_PERF_CAPABILITIES) & PMU_CAP_FW_WRITES)
+			counter_msr = MSR_IA32_PMC0;
+		else
+			counter_msr = MSR_IA32_PERFCTR0;
+	} else {
+		nr_gp_counters = AMD64_NR_COUNTERS;
+		event_sel_msr = MSR_K7_EVNTSEL0;
+		counter_msr = MSR_K7_PERFCTR0;
+	}
 
 	for (i = 0; i < nr_gp_counters; i++) {
 		wrmsr(counter_msr + i, 0);
-		wrmsr(MSR_P6_EVNTSEL0 + i, ARCH_PERFMON_EVENTSEL_OS |
+		wrmsr(event_sel_msr + i, ARCH_PERFMON_EVENTSEL_OS |
 		      ARCH_PERFMON_EVENTSEL_ENABLE | event_code);
 
 		if (pmu_version > 1) {
@@ -85,7 +94,12 @@ static void guest_measure_loop(uint64_t event_code)
 		}
 	}
 
-	if (pmu_version < 2 || nr_fixed_counter < 1)
+	if (host_cpu_is_amd || pmu_version < 2)
+		goto done;
+
+	uint32_t nr_fixed_counter = this_cpu_property(X86_PROPERTY_PMU_NR_FIXED_COUNTERS);
+
+	if (nr_fixed_counter < 1)
 		goto done;
 
 	if (event_code == intel_arch_events[INTEL_ARCH_INSTRUCTIONS_RETIRED])
@@ -407,19 +421,41 @@ static void intel_test_pmu_version(void)
 	}
 }
 
+static void amd_test_pmu_counters(void)
+{
+	struct kvm_vcpu *vcpu;
+	struct kvm_vm *vm;
+	unsigned int i;
+	uint64_t msr_val;
+
+	for (i = 0; i < ARRAY_SIZE(amd_arch_events); i++) {
+		vm = pmu_vm_create_with_one_vcpu(&vcpu, guest_measure_loop);
+		vcpu_args_set(vcpu, 1, amd_arch_events[i]);
+		while (run_vcpu(vcpu, &msr_val) != UCALL_DONE)
+			TEST_ASSERT(msr_val, "Unexpected AMD counter values");
+
+		kvm_vm_free(vm);
+	}
+}
+
 int main(int argc, char *argv[])
 {
 	TEST_REQUIRE(get_kvm_param_bool("enable_pmu"));
 
-	TEST_REQUIRE(host_cpu_is_intel);
-	TEST_REQUIRE(kvm_cpu_has_p(X86_PROPERTY_PMU_VERSION));
-	TEST_REQUIRE(kvm_cpu_property(X86_PROPERTY_PMU_VERSION) > 0);
-	TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_PDCM));
-
-	intel_test_arch_events();
-	intel_test_counters_num();
-	intel_test_fixed_counters();
-	intel_test_pmu_version();
+	if (host_cpu_is_intel) {
+		TEST_REQUIRE(kvm_cpu_has_p(X86_PROPERTY_PMU_VERSION));
+		TEST_REQUIRE(kvm_cpu_property(X86_PROPERTY_PMU_VERSION) > 0);
+		TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_PDCM));
+
+		intel_test_arch_events();
+		intel_test_counters_num();
+		intel_test_fixed_counters();
+		intel_test_pmu_version();
+	} else if (host_cpu_is_amd) {
+		amd_test_pmu_counters();
+	} else {
+		TEST_FAIL("Unknown CPU vendor");
+	}
 
 	return 0;
 }
-- 
2.39.3