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

[Sheng Yang]

Signed-off-by: Sheng Yang <[EMAIL PROTECTED]>
---
 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

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