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Message-Id: <20230911114347.85882-9-cloudliang@tencent.com>
Date: Mon, 11 Sep 2023 19:43:46 +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 v4 8/9] KVM: selftests: Test Intel supported fixed counters bit mask
From: Jinrong Liang <cloudliang@...cent.com>
Add a test to check that fixed counters enabled via guest
CPUID.0xA.ECX (instead of EDX[04:00]) work as normal as usual.
Co-developed-by: Like Xu <likexu@...cent.com>
Signed-off-by: Like Xu <likexu@...cent.com>
Signed-off-by: Jinrong Liang <cloudliang@...cent.com>
---
.../selftests/kvm/x86_64/pmu_counters_test.c | 54 +++++++++++++++++++
1 file changed, 54 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 df76f0f2bfd0..12c00bf94683 100644
--- a/tools/testing/selftests/kvm/x86_64/pmu_counters_test.c
+++ b/tools/testing/selftests/kvm/x86_64/pmu_counters_test.c
@@ -301,6 +301,59 @@ static void test_intel_counters_num(void)
test_oob_fixed_ctr(nr_fixed_counters + 1);
}
+static void fixed_counters_guest_code(void)
+{
+ uint64_t supported_bitmask = this_cpu_property(X86_PROPERTY_PMU_FIXED_COUNTERS_BITMASK);
+ uint32_t nr_fixed_counter = this_cpu_property(X86_PROPERTY_PMU_NR_FIXED_COUNTERS);
+ uint64_t msr_val;
+ unsigned int i;
+ bool expected;
+
+ for (i = 0; i < nr_fixed_counter; i++) {
+ expected = supported_bitmask & BIT_ULL(i) || i < nr_fixed_counter;
+
+ wrmsr_safe(MSR_CORE_PERF_FIXED_CTR0 + i, 0);
+ wrmsr_safe(MSR_CORE_PERF_FIXED_CTR_CTRL, BIT_ULL(4 * i));
+ wrmsr_safe(MSR_CORE_PERF_GLOBAL_CTRL, BIT_ULL(PMC_IDX_FIXED + i));
+ __asm__ __volatile__("loop ." : "+c"((int){NUM_BRANCHES}));
+ wrmsr_safe(MSR_CORE_PERF_GLOBAL_CTRL, 0);
+ rdmsr_safe(MSR_CORE_PERF_FIXED_CTR0 + i, &msr_val);
+
+ GUEST_ASSERT_EQ(expected, !!msr_val);
+ }
+
+ GUEST_DONE();
+}
+
+static void __test_fixed_counters(uint32_t fixed_bitmask, uint8_t edx_fixed_num)
+{
+ struct kvm_vcpu *vcpu;
+ struct kvm_vm *vm;
+
+ vm = pmu_vm_create_with_one_vcpu(&vcpu, fixed_counters_guest_code);
+
+ vcpu_set_cpuid_property(vcpu, X86_PROPERTY_PMU_FIXED_COUNTERS_BITMASK,
+ fixed_bitmask);
+ vcpu_set_cpuid_property(vcpu, X86_PROPERTY_PMU_NR_FIXED_COUNTERS,
+ edx_fixed_num);
+
+ run_vcpu(vcpu);
+
+ kvm_vm_free(vm);
+}
+
+static void test_fixed_counters(void)
+{
+ uint8_t nr_fixed_counters = kvm_cpu_property(X86_PROPERTY_PMU_NR_FIXED_COUNTERS);
+ uint32_t ecx;
+ uint8_t edx;
+
+ for (edx = 0; edx <= nr_fixed_counters; edx++)
+ /* KVM doesn't emulate more fixed counters than it can support. */
+ for (ecx = 0; ecx <= (BIT_ULL(nr_fixed_counters) - 1); ecx++)
+ __test_fixed_counters(ecx, edx);
+}
+
int main(int argc, char *argv[])
{
TEST_REQUIRE(get_kvm_param_bool("enable_pmu"));
@@ -312,6 +365,7 @@ int main(int argc, char *argv[])
test_intel_arch_events();
test_intel_counters_num();
+ test_fixed_counters();
return 0;
}
--
2.39.3
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