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@amd.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

1 files changed, 12 insertions, 4 deletions

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 59fe4d54da11..3f3fe815c21b 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -2472,10 +2472,18 @@ 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)