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KVM: selftests: Add negative testcase for PEBS format in PERF_CAPABILITIES 

Expand the immutable features sub-test for PERF_CAPABILITIES to verify
KVM rejects any attempt to use a PEBS format other than the host's.

Link: https://lore.kernel.org/r/20230311004618.920745-21-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson 2023-03-10 16:46:17 -08:00
parent 8ac2f774b9
commit 8b95b41555
1 changed files with 10 additions and 0 deletions
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tools/testing/selftests/kvm/x86_64/vmx_pmu_caps_test.c
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@ -191,6 +191,16 @@ static void test_immutable_perf_capabilities(union perf_capabilities host_cap)
val.lbr_format, host_cap.lbr_format);
}
/* Ditto for the PEBS format. */
for (val.pebs_format = 1; val.pebs_format; val.pebs_format++) {
if (val.pebs_format == host_cap.pebs_format)
continue;
r = _vcpu_set_msr(vcpu, MSR_IA32_PERF_CAPABILITIES, val.capabilities);
TEST_ASSERT(!r, "Bad PEBS FMT = 0x%x didn't fail, host = 0x%x",
val.pebs_format, host_cap.pebs_format);
}
kvm_vm_free(vm);
}