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KVM: selftests: Test post-KVM_RUN writes to PERF_CAPABILITIES

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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.

Link: https://lore.kernel.org/r/20230311004618.920745-18-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson
2023-03-10 16:46:14 -08:00
parent baa36dac6c
commit 81fd924112
1 changed files with 13 additions and 0 deletions
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13
tools/testing/selftests/kvm/x86_64/vmx_pmu_caps_test.c
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@@ -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);
}