Commit aaca2100 authored Mar 02, 2020 by Haiwei Li Committed by Paolo Bonzini Mar 02, 2020

KVM: SVM: Fix the svm vmexit code for WRMSR



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: 1e9e2622 ("KVM: VMX: FIXED+PHYSICAL mode single target IPI fastpath", 2019-11-21)
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

parent 9a11997e

arch/x86/kvm/svm.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -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);
		}

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