[PATCHv2 17/23] KVM: handle emulation failure case first.

[Gleb Natapov <gleb@redhat.com>]

If emulation failed return immediately.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
---
 arch/x86/kvm/x86.c |   31 +++++++++++++++----------------
 1 files changed, 15 insertions(+), 16 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 696b34b..445769b 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3862,22 +3862,6 @@ int emulate_instruction(struct kvm_vcpu *vcpu,
 
 restart:
 	r = x86_emulate_insn(&vcpu->arch.emulate_ctxt, &emulate_ops);
-	shadow_mask = vcpu->arch.emulate_ctxt.interruptibility;
-
-	if (r == 0)
-		kvm_x86_ops->set_interrupt_shadow(vcpu, shadow_mask);
-
-	if (vcpu->arch.pio.count) {
-		if (!vcpu->arch.pio.in)
-			vcpu->arch.pio.count = 0;
-		return EMULATE_DO_MMIO;
-	}
-
-	if (vcpu->mmio_needed) {
-		if (vcpu->mmio_is_write)
-			vcpu->mmio_needed = 0;
-		return EMULATE_DO_MMIO;
-	}
 
 	if (r) { /* emulation failed */
 		/*
@@ -3893,6 +3877,21 @@ restart:
 		return EMULATE_FAIL;
 	}
 
+	shadow_mask = vcpu->arch.emulate_ctxt.interruptibility;
+	kvm_x86_ops->set_interrupt_shadow(vcpu, shadow_mask);
+
+	if (vcpu->arch.pio.count) {
+		if (!vcpu->arch.pio.in)
+			vcpu->arch.pio.count = 0;
+		return EMULATE_DO_MMIO;
+	}
+
+	if (vcpu->mmio_needed) {
+		if (vcpu->mmio_is_write)
+			vcpu->mmio_needed = 0;
+		return EMULATE_DO_MMIO;
+	}
+
 	if (vcpu->arch.exception.pending)
 		vcpu->arch.emulate_ctxt.restart = false;
 
-- 
1.6.5