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| author | Sean Christopherson <seanjc@google.com> | 2023-03-10 16:46:14 -0800 |
|---|---|---|
| committer | Sean Christopherson <seanjc@google.com> | 2023-04-06 14:58:44 -0700 |
| commit | 81fd92411264e4f7b982bb6066b4bc04311bc48a (patch) | |
| tree | 6791a0dd0e5a5c225c27a15921a61c91f8ce2ddd /tools | |
| parent | baa36dac6ca8ecd709dafb87a79d3bead40e48fe (diff) | |
| download | linux-stable-81fd92411264e4f7b982bb6066b4bc04311bc48a.tar.gz linux-stable-81fd92411264e4f7b982bb6066b4bc04311bc48a.tar.bz2 linux-stable-81fd92411264e4f7b982bb6066b4bc04311bc48a.zip | |
KVM: selftests: Test post-KVM_RUN writes to PERF_CAPABILITIES
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>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/testing/selftests/kvm/x86_64/vmx_pmu_caps_test.c | 13 |
1 files changed, 13 insertions, 0 deletions
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); } |