Now that KVM disallows changing PERF_CAPABILITIES after KVM_RUN, expand
the host side checks to verify KVM rejects any attempts to change bits
from userspace.
Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
---
.../selftests/kvm/x86_64/vmx_pmu_caps_test.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/tools/testing/selftests/kvm/x86_64/vmx_pmu_caps_test.c b/tools/testing/selftests/kvm/x86_64/vmx_pmu_caps_test.c
index 44fc6101a547..6fc86f5eba0b 100644
--- a/tools/testing/selftests/kvm/x86_64/vmx_pmu_caps_test.c
+++ b/tools/testing/selftests/kvm/x86_64/vmx_pmu_caps_test.c
@@ -85,6 +85,7 @@ static void test_guest_wrmsr_perf_capabilities(union perf_capabilities host_cap)
struct kvm_vcpu *vcpu;
struct kvm_vm *vm = vm_create_with_one_vcpu(&vcpu, guest_code);
struct ucall uc;
+ int r, i;
vm_init_descriptor_tables(vm);
vcpu_init_descriptor_tables(vcpu);
@@ -106,6 +107,18 @@ static void test_guest_wrmsr_perf_capabilities(union perf_capabilities host_cap)
ASSERT_EQ(vcpu_get_msr(vcpu, MSR_IA32_PERF_CAPABILITIES), host_cap.capabilities);
+ vcpu_set_msr(vcpu, MSR_IA32_PERF_CAPABILITIES, host_cap.capabilities);
+
+ r = _vcpu_set_msr(vcpu, MSR_IA32_PERF_CAPABILITIES, 0);
+ TEST_ASSERT(!r, "Post-KVM_RUN write '0' didn't fail");
+
+ for (i = 0; i < 64; i++) {
+ r = _vcpu_set_msr(vcpu, MSR_IA32_PERF_CAPABILITIES,
+ host_cap.capabilities ^ BIT_ULL(i));
+ TEST_ASSERT(!r, "Post-KVM_RUN write '0x%llx'didn't fail",
+ host_cap.capabilities ^ BIT_ULL(i));
+ }
+
kvm_vm_free(vm);
}
--
2.39.1.581.gbfd45094c4-goog
