linux-kernel - [PATCH 9/9] KVM: selftests: Test AMD Guest PerfMonV2

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Message-Id: <20231121115457.76269-10-cloudliang@tencent.com>
Date:   Tue, 21 Nov 2023 19:54:57 +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>,
        Jim Mattson <jmattson@...gle.com>,
        Aaron Lewis <aaronlewis@...gle.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jinrong Liang <cloudliang@...cent.com>,
        Jinrong Liang <ljr.kernel@...il.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 9/9] KVM: selftests: Test AMD Guest PerfMonV2

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

Add test case for AMD Guest PerfMonV2.

Signed-off-by: Jinrong Liang <cloudliang@...cent.com>
---
 .../selftests/kvm/x86_64/pmu_counters_test.c  | 35 +++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/tools/testing/selftests/kvm/x86_64/pmu_counters_test.c b/tools/testing/selftests/kvm/x86_64/pmu_counters_test.c
index ca5b352ea6ae..aa44f2282996 100644
--- a/tools/testing/selftests/kvm/x86_64/pmu_counters_test.c
+++ b/tools/testing/selftests/kvm/x86_64/pmu_counters_test.c
@@ -722,6 +722,38 @@ static void set_amd_counters(uint8_t *nr_amd_ounters, uint64_t *ctrl_msr,
 	}
 }
 
+static void guest_test_amd_perfmonv2(void)
+{
+	unsigned int i;
+
+	for (i = 0; i < AMD64_NR_COUNTERS_CORE; i++) {
+		wrmsr(MSR_F15H_PERF_CTL0 + i * 2, 0);
+		wrmsr(MSR_F15H_PERF_CTR0 + i * 2, ARCH_PERFMON_EVENTSEL_OS |
+		      ARCH_PERFMON_EVENTSEL_ENABLE | AMD_ZEN_CORE_CYCLES);
+
+		wrmsr(MSR_AMD64_PERF_CNTR_GLOBAL_CTL, 0);
+		__asm__ __volatile__("loop ." : "+c"((int){NUM_BRANCHES}));
+		GUEST_ASSERT(!_rdpmc(i));
+
+		wrmsr(MSR_AMD64_PERF_CNTR_GLOBAL_CTL, BIT_ULL(i));
+		__asm__ __volatile__("loop ." : "+c"((int){NUM_BRANCHES}));
+		wrmsr(MSR_AMD64_PERF_CNTR_GLOBAL_CTL, 0);
+		GUEST_ASSERT(_rdpmc(i));
+
+		wrmsr(MSR_F15H_PERF_CTL0 + i * 2, (1ULL << 48) - 2);
+		wrmsr(MSR_AMD64_PERF_CNTR_GLOBAL_STATUS_CLR, 0xff);
+		wrmsr(MSR_AMD64_PERF_CNTR_GLOBAL_CTL, BIT_ULL(i));
+		__asm__ __volatile__("loop ." : "+c"((int){NUM_BRANCHES}));
+		wrmsr(MSR_AMD64_PERF_CNTR_GLOBAL_CTL, 0);
+		GUEST_ASSERT(rdmsr(MSR_AMD64_PERF_CNTR_GLOBAL_STATUS) &
+			     BIT_ULL(i));
+
+		wrmsr(MSR_AMD64_PERF_CNTR_GLOBAL_STATUS_CLR, BIT_ULL(i));
+		GUEST_ASSERT(!(rdmsr(MSR_AMD64_PERF_CNTR_GLOBAL_STATUS) &
+			     BIT_ULL(i)));
+	}
+}
+
 static void guest_test_amd_counters(void)
 {
 	bool guest_pmu_is_perfmonv2 = this_cpu_has(X86_FEATURE_PERFMON_V2);
@@ -747,6 +779,9 @@ static void guest_test_amd_counters(void)
 		}
 	}
 
+	if (guest_pmu_is_perfmonv2)
+		guest_test_amd_perfmonv2();
+
 	GUEST_DONE();
 }
 
-- 
2.39.3