linux-kernel - [PATCH v3 20/21] KVM: selftests: Add negative testcase for PEBS format in PERF

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Date:   Fri, 10 Mar 2023 16:46:17 -0800
From:   Sean Christopherson <seanjc@...gle.com>
To:     Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Xiaoyao Li <xiaoyao.li@...el.com>,
        Like Xu <like.xu.linux@...il.com>,
        Yu Zhang <yu.c.zhang@...ux.intel.com>
Subject: [PATCH v3 20/21] 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.

Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 tools/testing/selftests/kvm/x86_64/vmx_pmu_caps_test.c | 10 ++++++++++
 1 file changed, 10 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 38aec88d733b..29aaa0419294 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
@@ -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);
 }
 
-- 
2.40.0.rc1.284.g88254d51c5-goog