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 <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index ab78eb8..ec20584 100644 (file)
--- 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)