[PATCH 1/1] KVM: IRQ ACK notifier should be used with in-kernel irqchip

[Sheng Yang <sheng@linux.intel.com>]

Signed-off-by: Sheng Yang <sheng@linux.intel.com>
---
 arch/x86/kvm/irq.c |    4 ++++
 arch/x86/kvm/x86.c |    4 +++-
 2 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kvm/irq.c b/arch/x86/kvm/irq.c
index 8c1b9c5..24e2667 100644
--- a/arch/x86/kvm/irq.c
+++ b/arch/x86/kvm/irq.c
@@ -124,11 +124,15 @@ void kvm_notify_acked_irq(struct kvm *kvm, unsigned gsi)
 void kvm_register_irq_ack_notifier(struct kvm *kvm,
 				   struct kvm_irq_ack_notifier *kian)
 {
+	/* Must be called with in-kernel IRQ chip, otherwise it's nonsense */
+	ASSERT(irqchip_in_kernel(kvm));
 	hlist_add_head(&kian->link, &kvm->arch.irq_ack_notifier_list);
 }
 
 void kvm_unregister_irq_ack_notifier(struct kvm *kvm,
 				     struct kvm_irq_ack_notifier *kian)
 {
+	/* Must be called with in-kernel IRQ chip, otherwise it's nonsense */
+	ASSERT(irqchip_in_kernel(kvm));
 	hlist_del(&kian->link);
 }
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 675fcc1..c5763d7 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -176,7 +176,9 @@ static void kvm_free_assigned_device(struct kvm *kvm,
 	if (irqchip_in_kernel(kvm) && assigned_dev->irq_requested)
 		free_irq(assigned_dev->host_irq, (void *)assigned_dev);
 
-	kvm_unregister_irq_ack_notifier(kvm, &assigned_dev->ack_notifier);
+	if (irqchip_in_kernel(kvm))
+		kvm_unregister_irq_ack_notifier(kvm,
+				&assigned_dev->ack_notifier);
 
 	if (cancel_work_sync(&assigned_dev->interrupt_work))
 		/* We had pending work. That means we will have to take
-- 
1.5.4.5