KVM: VMX: When emulating on invalid vmx state, don't return to userspace unnecessarily

If we aren't doing mmio there's no need to exit to userspace (which will
just be confused).

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

1 files changed, 6 insertions, 2 deletions

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index a309be6788e7..df454de8acfa 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -91,6 +91,7 @@ struct vcpu_vmx {
         } rmode;
         int vpid;
         bool emulation_required;
+        enum emulation_result invalid_state_emulation_result;
 
         /* Support for vnmi-less CPUs */
         int soft_vnmi_blocked;
@@ -3130,7 +3131,8 @@ static int handle_nmi_window(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
 static void handle_invalid_guest_state(struct kvm_vcpu *vcpu,
                                 struct kvm_run *kvm_run)
 {
-        int err;
+        struct vcpu_vmx *vmx = to_vmx(vcpu);
+        enum emulation_result err = EMULATE_DONE;
 
         preempt_enable();
         local_irq_enable();
@@ -3154,6 +3156,8 @@ static void handle_invalid_guest_state(struct kvm_vcpu *vcpu,
 
         local_irq_disable();
         preempt_disable();
+
+        vmx->invalid_state_emulation_result = err;
 }
 
 /*
@@ -3205,7 +3209,7 @@ static int kvm_handle_exit(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
         if (vmx->emulation_required && emulate_invalid_guest_state) {
                 if (guest_state_valid(vcpu))
                         vmx->emulation_required = 0;
-                return 0;
+                return vmx->invalid_state_emulation_result != EMULATE_DO_MMIO;
         }
 
         /* Access CR3 don't cause VMExit in paging mode, so we need