From: Jinrong Liang <[email protected]>
Add test to check if non-existent counters can be accessed in guest after
determining the number of Intel generic performance counters by CPUID.
Per SDM, fixed-function performance counter 'i' is supported if ECX[i] ||
(EDX[4:0] > i). KVM doesn't emulate more counters than it can support.
Co-developed-by: Like Xu <[email protected]>
Signed-off-by: Like Xu <[email protected]>
Signed-off-by: Jinrong Liang <[email protected]>
---
.../kvm/x86_64/pmu_basic_functionality_test.c | 41 +++++++++++++++++++
1 file changed, 41 insertions(+)
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 b86033e51d5c..db1c1230700a 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
@@ -212,10 +212,43 @@ static void test_oob_gp_counter(uint8_t eax_gp_num, uint8_t offset,
kvm_vm_free(vm);
}
+static void intel_test_oob_fixed_ctr(uint8_t edx_fixed_num,
+ uint32_t fixed_bitmask, uint64_t expected)
+{
+ uint8_t idx = edx_fixed_num;
+ struct kvm_vcpu *vcpu;
+ uint64_t msr_val = 0;
+ struct kvm_vm *vm;
+ bool visible;
+
+ vm = pmu_vm_create_with_one_vcpu(&vcpu, guest_wr_and_rd_msrs);
+
+ 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);
+
+ visible = fixed_counter_is_supported(vcpu, idx);
+
+ /* KVM doesn't emulate more fixed counters than it can support. */
+ if (idx >= kvm_cpu_property(X86_PROPERTY_PMU_NR_FIXED_COUNTERS))
+ visible = false;
+
+ vcpu_args_set(vcpu, 3, MSR_CORE_PERF_FIXED_CTR0, idx, 1);
+ if (visible) {
+ while (run_vcpu(vcpu, &msr_val) != UCALL_DONE)
+ TEST_ASSERT_EQ(expected, msr_val);
+ }
+
+ kvm_vm_free(vm);
+}
+
static void intel_test_counters_num(void)
{
+ uint8_t nr_fixed_counters = kvm_cpu_property(X86_PROPERTY_PMU_NR_FIXED_COUNTERS);
uint8_t nr_gp_counters = kvm_cpu_property(X86_PROPERTY_PMU_NR_GP_COUNTERS);
unsigned int i;
+ uint32_t ecx;
TEST_REQUIRE(nr_gp_counters > 2);
@@ -239,6 +272,14 @@ static void intel_test_counters_num(void)
if (!perf_caps[i])
test_oob_gp_counter(0, 2, perf_caps[i], 0);
}
+
+ for (ecx = 0;
+ ecx <= kvm_cpu_property(X86_PROPERTY_PMU_FIXED_COUNTERS_BITMASK) + 1;
+ ecx++) {
+ intel_test_oob_fixed_ctr(0, ecx, GP_VECTOR);
+ intel_test_oob_fixed_ctr(nr_fixed_counters, ecx, GP_VECTOR);
+ intel_test_oob_fixed_ctr(nr_fixed_counters + 1, ecx, GP_VECTOR);
+ }
}
int main(int argc, char *argv[])
--
2.39.3