linux-kernel - [PATCH 1/5] KVM: SVM: reorganize svm_interrupt

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Date:	Wed, 16 Sep 2009 15:24:15 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	Avi Kivity <avi@...hat.com>
CC:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Alexander Graf <agraf@...e.de>,
	Joerg Roedel <joerg.roedel@....com>
Subject: [PATCH 1/5] KVM: SVM: reorganize svm_interrupt_allowed

This patch reorganizes the logic in svm_interrupt_allowed to
make it better to read. This is important because the logic
is a lot more complicated with Nested SVM.

Signed-off-by: Joerg Roedel <joerg.roedel@....com>
---
 arch/x86/kvm/svm.c |   16 ++++++++++++----
 1 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index a2f2d43..668460c 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -2454,10 +2454,18 @@ static int svm_interrupt_allowed(struct kvm_vcpu *vcpu)
 {
 	struct vcpu_svm *svm = to_svm(vcpu);
 	struct vmcb *vmcb = svm->vmcb;
-	return (vmcb->save.rflags & X86_EFLAGS_IF) &&
-		!(vmcb->control.int_state & SVM_INTERRUPT_SHADOW_MASK) &&
-		gif_set(svm) &&
-		!(is_nested(svm) && (svm->vcpu.arch.hflags & HF_VINTR_MASK));
+	int ret;
+
+	if (!gif_set(svm) ||
+	     (vmcb->control.int_state & SVM_INTERRUPT_SHADOW_MASK))
+		return 0;
+
+	ret = !!(vmcb->save.rflags & X86_EFLAGS_IF);
+
+	if (is_nested(svm))
+		return ret && !(svm->vcpu.arch.hflags & HF_VINTR_MASK);
+
+	return ret;
 }
 
 static void enable_irq_window(struct kvm_vcpu *vcpu)
-- 
1.6.3.3


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