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KVM: x86: Drop guest CPUID check for host initiated writes to MSR_IA32_PERF_CAPABILITIES

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[ Upstream commit 1aa2abb33a419090c7c87d4ae842a6347078ee12 ]

The ability to write to MSR_IA32_PERF_CAPABILITIES from the host should
not depend on guest visible CPUID entries, even if just to allow
creating/restoring guest MSRs and CPUIDs in any sequence.

Fixes: 27461da310 ("KVM: x86/pmu: Support full width counting")
Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Message-Id: <20211216165213.338923-3-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Vitaly Kuznetsov
2021-12-16 17:52:13 +01:00
committed by Greg Kroah-Hartman
parent 5fe305c6d4
commit 9439fabfc3
1 changed files with 1 additions and 1 deletions
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arch/x86/kvm/x86.c
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@@ -3065,7 +3065,7 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
if (!msr_info->host_initiated) if (!msr_info->host_initiated)
return 1; return 1;
if (guest_cpuid_has(vcpu, X86_FEATURE_PDCM) && kvm_get_msr_feature(&msr_ent)) if (kvm_get_msr_feature(&msr_ent))
return 1; return 1;
if (data & ~msr_ent.data) if (data & ~msr_ent.data)
return 1; return 1;