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Message-Id: <20210512144841.096628832@linuxfoundation.org>
Date: Wed, 12 May 2021 16:42:43 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Sean Christopherson <seanjc@...gle.com>,
Vitaly Kuznetsov <vkuznets@...hat.com>,
Paolo Bonzini <pbonzini@...hat.com>
Subject: [PATCH 5.12 117/677] KVM: SVM: Inject #GP on guest MSR_TSC_AUX accesses if RDTSCP unsupported
From: Sean Christopherson <seanjc@...gle.com>
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@...r.kernel.org
Signed-off-by: Sean Christopherson <seanjc@...gle.com>
Message-Id: <20210423223404.3860547-2-seanjc@...gle.com>
Reviewed-by: Vitaly Kuznetsov <vkuznets@...hat.com>
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
arch/x86/kvm/svm/svm.c | 7 +++++++
1 file changed, 7 insertions(+)
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -2738,6 +2738,9 @@ static int svm_get_msr(struct kvm_vcpu *
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;
/*
@@ -2946,6 +2949,10 @@ static int svm_set_msr(struct kvm_vcpu *
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
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