KVM: SVM: Refactor AVIC vcpu initialization into avic_init_vcpu()

Preparing the base code for subsequent changes. This does not change
existing logic.
Signed-off-by: NSuravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Signed-off-by: NRadim Krčmář <rkrcmar@redhat.com>

arch/x86/kvm/svm.c

@@ -1600,6 +1600,23 @@ static void svm_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event)
 		avic_update_vapic_bar(svm, APIC_DEFAULT_PHYS_BASE);
 }
 
+static int avic_init_vcpu(struct vcpu_svm *svm)
+{
+	int ret;
+
+	if (!avic)
+		return 0;
+
+	ret = avic_init_backing_page(&svm->vcpu);
+	if (ret)
+		return ret;
+
+	INIT_LIST_HEAD(&svm->ir_list);
+	spin_lock_init(&svm->ir_list_lock);
+
+	return ret;
+}
+
 static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id)
 {
 	struct vcpu_svm *svm;
@@ -1636,15 +1653,10 @@ static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id)
 	if (!hsave_page)
 		goto free_page3;
 
-	if (avic) {
-		err = avic_init_backing_page(&svm->vcpu);
+	err = avic_init_vcpu(svm);
 	if (err)
 		goto free_page4;
 
-		INIT_LIST_HEAD(&svm->ir_list);
-		spin_lock_init(&svm->ir_list_lock);
-	}
-
 	/* We initialize this flag to true to make sure that the is_running
 	 * bit would be set the first time the vcpu is loaded.
 	 */