From 924584ccb08c338ebd2f40936ff2321c1cce6a6d Mon Sep 17 00:00:00 2001 From: Joerg Roedel Date: Thu, 22 Apr 2010 12:33:07 +0200 Subject: [PATCH] KVM: SVM: Fix nested nmi handling The patch introducing nested nmi handling had a bug. The check does not belong to enable_nmi_window but must be in nmi_allowed. This patch fixes this. Signed-off-by: Joerg Roedel Signed-off-by: Avi Kivity --- arch/x86/kvm/svm.c | 16 +++++++++------- 1 file changed, 9 insertions(+), 7 deletions(-) diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index ab78eb8ba89..ec205847be6 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -2771,8 +2771,12 @@ static int svm_nmi_allowed(struct kvm_vcpu *vcpu) { struct vcpu_svm *svm = to_svm(vcpu); struct vmcb *vmcb = svm->vmcb; - return !(vmcb->control.int_state & SVM_INTERRUPT_SHADOW_MASK) && - !(svm->vcpu.arch.hflags & HF_NMI_MASK); + int ret; + ret = !(vmcb->control.int_state & SVM_INTERRUPT_SHADOW_MASK) && + !(svm->vcpu.arch.hflags & HF_NMI_MASK); + ret = ret && gif_set(svm) && nested_svm_nmi(svm); + + return ret; } static bool svm_get_nmi_mask(struct kvm_vcpu *vcpu) @@ -2841,11 +2845,9 @@ static void enable_nmi_window(struct kvm_vcpu *vcpu) * Something prevents NMI from been injected. Single step over possible * problem (IRET or exception injection or interrupt shadow) */ - if (gif_set(svm) && nested_svm_nmi(svm)) { - svm->nmi_singlestep = true; - svm->vmcb->save.rflags |= (X86_EFLAGS_TF | X86_EFLAGS_RF); - update_db_intercept(vcpu); - } + svm->nmi_singlestep = true; + svm->vmcb->save.rflags |= (X86_EFLAGS_TF | X86_EFLAGS_RF); + update_db_intercept(vcpu); } static int svm_set_tss_addr(struct kvm *kvm, unsigned int addr) -- 2.11.4.GIT