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KVM: SVM: Fix the svm vmexit code for WRMSR

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In svm, exit_code for MSR writes is not EXIT_REASON_MSR_WRITE which
belongs to vmx.

According to amd manual, SVM_EXIT_MSR(7ch) is the exit_code of VMEXIT_MSR
due to RDMSR or WRMSR access to protected MSR. Additionally, the processor
indicates in the VMCB's EXITINFO1 whether a RDMSR(EXITINFO1=0) or
WRMSR(EXITINFO1=1) was intercepted.

Signed-off-by: Haiwei Li <lihaiwei@tencent.com>
Fixes: 1e9e2622a1 ("KVM: VMX: FIXED+PHYSICAL mode single target IPI fastpath", 2019-11-21)
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Haiwei Li 2020-03-02 20:19:28 +08:00 committed by Paolo Bonzini
parent 9a11997e75
commit aaca21007b
1 changed files with 2 additions and 1 deletions
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3
arch/x86/kvm/svm.c
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@ -6312,7 +6312,8 @@ static void svm_handle_exit_irqoff(struct kvm_vcpu *vcpu,
enum exit_fastpath_completion *exit_fastpath)
{
if (!is_guest_mode(vcpu) &&
to_svm(vcpu)->vmcb->control.exit_code == EXIT_REASON_MSR_WRITE)
to_svm(vcpu)->vmcb->control.exit_code == SVM_EXIT_MSR &&
to_svm(vcpu)->vmcb->control.exit_info_1)
*exit_fastpath = handle_fastpath_set_msr_irqoff(vcpu);
}