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KVM: SVM: Inject #GP on guest MSR_TSC_AUX accesses if RDTSCP unsupported

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commit 6f2b296aa6432d8274e258cc3220047ca04f5de0 upstream.

Inject #GP on guest accesses to MSR_TSC_AUX if RDTSCP is unsupported in
the guest's CPUID model.

Fixes: 46896c73c1a4 ("KVM: svm: add support for RDTSCP")
Cc: stable@vger.kernel.org
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210423223404.3860547-2-seanjc@google.com>
Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sean Christopherson 2021-04-23 15:34:01 -07:00 committed by Greg Kroah-Hartman
parent 6ccdbedd16
commit 6748f80aea
1 changed files with 7 additions and 0 deletions
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7
arch/x86/kvm/svm/svm.c
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@ -2519,6 +2519,9 @@ static int svm_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
case MSR_TSC_AUX:
if (!boot_cpu_has(X86_FEATURE_RDTSCP))
return 1;
if (!msr_info->host_initiated &&
!guest_cpuid_has(vcpu, X86_FEATURE_RDTSCP))
return 1;
msr_info->data = svm->tsc_aux;
break;
/*
@ -2713,6 +2716,10 @@ static int svm_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr)
if (!boot_cpu_has(X86_FEATURE_RDTSCP))
return 1;
if (!msr->host_initiated &&
!guest_cpuid_has(vcpu, X86_FEATURE_RDTSCP))
return 1;
/*
* This is rare, so we update the MSR here instead of using
* direct_access_msrs. Doing that would require a rdmsr in