linux-kernel - [PATCH v2 10/21] KVM: selftests: Assert that full-width PMC writes are supported if PDCM=1

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Date:   Fri, 10 Feb 2023 00:31:37 +0000
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>
Subject: [PATCH v2 10/21] KVM: selftests: Assert that full-width PMC writes
 are supported if PDCM=1

KVM emulates full-width PMC writes in software, assert that KVM reports
full-width writes as supported if PERF_CAPABILITIES is supported.

Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 tools/testing/selftests/kvm/x86_64/vmx_pmu_caps_test.c | 3 +++
 1 file changed, 3 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 c3b0738e361b..035470b38400 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
@@ -110,6 +110,9 @@ int main(int argc, char *argv[])
 	host_cap.capabilities = kvm_get_feature_msr(MSR_IA32_PERF_CAPABILITIES);
 	host_cap.capabilities &= (PMU_CAP_FW_WRITES | PMU_CAP_LBR_FMT);
 
+	TEST_ASSERT(host_cap.full_width_write,
+		    "Full-width writes should always be supported");
+
 	test_basic_perf_capabilities(host_cap);
 	test_fungible_perf_capabilities(host_cap);
 	test_immutable_perf_capabilities(host_cap);
-- 
2.39.1.581.gbfd45094c4-goog