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From:   Jinrong Liang <ljr.kernel@gmail.com>
To:     Sean Christopherson <seanjc@google.com>
Cc:     Paolo Bonzini <pbonzini@redhat.com>, Like Xu <likexu@tencent.com>,
        Jim Mattson <jmattson@google.com>,
        Aaron Lewis <aaronlewis@google.com>,
        Wanpeng Li <wanpengli@tencent.com>,
        Jinrong Liang <cloudliang@tencent.com>,
        Jinrong Liang <ljr.kernel@gmail.com>, kvm@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: [PATCH 3/9] KVM: selftests: Test fixed counters overflow interrupt handling
Date:   Tue, 21 Nov 2023 19:54:51 +0800
Message-Id: <20231121115457.76269-4-cloudliang@tencent.com>
In-Reply-To: <20231121115457.76269-1-cloudliang@tencent.com>
References: <20231121115457.76269-1-cloudliang@tencent.com>
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From: Jinrong Liang <cloudliang@tencent.com>

Add tests to verify that fixed counters overflow interrupt handling
works as expected.

Signed-off-by: Jinrong Liang <cloudliang@tencent.com>
---
 .../selftests/kvm/x86_64/pmu_counters_test.c  | 32 +++++++++++++++++--
 1 file changed, 29 insertions(+), 3 deletions(-)

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 1b108e6718fc..efd8c61e1c16 100644
--- a/tools/testing/selftests/kvm/x86_64/pmu_counters_test.c
+++ b/tools/testing/selftests/kvm/x86_64/pmu_counters_test.c
@@ -551,9 +551,8 @@ static void test_pmi_init_x2apic(void)
 	pmi_irq_called = false;
 }
 
-static void guest_test_gp_counter_pmi(void)
+static void guest_test_gp_counter_pmi(uint8_t guest_pmu_version)
 {
-	uint8_t guest_pmu_version = guest_get_pmu_version();
 	uint32_t base_msr = get_pmc_msr();
 
 	test_pmi_init_x2apic();
@@ -569,6 +568,33 @@ static void guest_test_gp_counter_pmi(void)
 	guest_test_counters_pmi_workload();
 
 	GUEST_ASSERT(pmi_irq_called);
+}
+
+static void guest_test_fixed_counter_pmi(uint8_t guest_pmu_version)
+{
+	if (guest_pmu_version < 2)
+		return;
+
+	test_pmi_init_x2apic();
+
+	wrmsr(MSR_CORE_PERF_GLOBAL_CTRL, 0);
+	wrmsr(MSR_CORE_PERF_FIXED_CTR0,
+	      (1ULL << this_cpu_property(X86_PROPERTY_PMU_FIXED_COUNTERS_BIT_WIDTH)) - 2);
+	wrmsr(MSR_CORE_PERF_FIXED_CTR_CTRL, FIXED_PMC_CTRL(0, FIXED_PMC_ENABLE_PMI));
+
+	wrmsr(MSR_CORE_PERF_GLOBAL_CTRL, FIXED_PMC_GLOBAL_CTRL_ENABLE(0));
+	guest_test_counters_pmi_workload();
+
+	GUEST_ASSERT(pmi_irq_called);
+}
+
+static void guest_test_counters_pmi(void)
+{
+	uint8_t guest_pmu_version = guest_get_pmu_version();
+
+	guest_test_gp_counter_pmi(guest_pmu_version);
+	guest_test_fixed_counter_pmi(guest_pmu_version);
+
 	GUEST_DONE();
 }
 
@@ -580,7 +606,7 @@ static void test_intel_ovf_pmi(uint8_t pmu_version, uint64_t perf_capabilities)
 	if (!pmu_version)
 		return;
 
-	vm = intel_pmu_vm_create(&vcpu, guest_test_gp_counter_pmi, pmu_version,
+	vm = intel_pmu_vm_create(&vcpu, guest_test_counters_pmi, pmu_version,
 				 perf_capabilities);
 
 	vm_install_exception_handler(vm, PMI_VECTOR, pmi_irq_handler);
-- 
2.39.3