linux-kernel - [PATCH v2 13/21] KVM: selftests: Drop now-redundant checks on PERF

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Date:   Fri, 10 Feb 2023 00:31:40 +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 13/21] KVM: selftests: Drop now-redundant checks on
 PERF_CAPABILITIES writes

Now that vcpu_set_msr() verifies the expected "read what was wrote"
semantics of all durable MSRs, including PERF_CAPABILITIES, drop the
now-redundant manual checks in the VMX PMU caps test.

Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 tools/testing/selftests/kvm/x86_64/vmx_pmu_caps_test.c | 6 ------
 1 file changed, 6 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 035470b38400..f7a27b5c949b 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
@@ -51,10 +51,7 @@ static void test_basic_perf_capabilities(union perf_capabilities host_cap)
 	struct kvm_vm *vm = vm_create_with_one_vcpu(&vcpu, NULL);
 
 	vcpu_set_msr(vcpu, MSR_IA32_PERF_CAPABILITIES, 0);
-	ASSERT_EQ(vcpu_get_msr(vcpu, MSR_IA32_PERF_CAPABILITIES), 0);
-
 	vcpu_set_msr(vcpu, MSR_IA32_PERF_CAPABILITIES, host_cap.capabilities);
-	ASSERT_EQ(vcpu_get_msr(vcpu, MSR_IA32_PERF_CAPABILITIES), host_cap.capabilities);
 
 	kvm_vm_free(vm);
 }
@@ -67,9 +64,6 @@ static void test_fungible_perf_capabilities(union perf_capabilities host_cap)
 	/* testcase 1, set capabilities when we have PDCM bit */
 	vcpu_set_msr(vcpu, MSR_IA32_PERF_CAPABILITIES, PMU_CAP_FW_WRITES);
 
-	/* check capabilities can be retrieved with KVM_GET_MSR */
-	ASSERT_EQ(vcpu_get_msr(vcpu, MSR_IA32_PERF_CAPABILITIES), PMU_CAP_FW_WRITES);
-
 	/* check whatever we write with KVM_SET_MSR is _not_ modified */
 	vcpu_run(vcpu);
 	ASSERT_EQ(vcpu_get_msr(vcpu, MSR_IA32_PERF_CAPABILITIES), PMU_CAP_FW_WRITES);
-- 
2.39.1.581.gbfd45094c4-goog