From: Gleb Natapov <gleb@redhat.com>
Date: Wed, 28 Apr 2010 16:15:38 +0000 (+0300)
Subject: KVM: handle emulation failure case first
X-Git-Tag: firefly_0821_release~9833^2~1315^2~176
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=3457e4192e367fd4e0da5e9f46f9df85fa99cd11;p=firefly-linux-kernel-4.4.55.git

KVM: handle emulation failure case first

If emulation failed return immediately.

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

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 51402d8a46fa..9e5a833f3392 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3924,22 +3924,6 @@ 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 */
 		/*
@@ -3955,6 +3939,21 @@ 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;