KVM: VMX: fix real-mode NMI support

Fix NMI injection in real-mode with the same pattern we perform IRQ
injection.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 440f56cd4bdd..38d138566617 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -2358,6 +2358,19 @@ static void vmx_inject_irq(struct kvm_vcpu *vcpu, int irq)
 
 static void vmx_inject_nmi(struct kvm_vcpu *vcpu)
 {
+        struct vcpu_vmx *vmx = to_vmx(vcpu);
+
+        if (vcpu->arch.rmode.active) {
+                vmx->rmode.irq.pending = true;
+                vmx->rmode.irq.vector = NMI_VECTOR;
+                vmx->rmode.irq.rip = kvm_rip_read(vcpu);
+                vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
+                             NMI_VECTOR | INTR_TYPE_SOFT_INTR |
+                             INTR_INFO_VALID_MASK);
+                vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, 1);
+                kvm_rip_write(vcpu, vmx->rmode.irq.rip - 1);
+                return;
+        }
         vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
                         INTR_TYPE_NMI_INTR | INTR_INFO_VALID_MASK | NMI_VECTOR);
 }