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-rw-r--r--virt/kvm/kvm_main.c15
1 files changed, 14 insertions, 1 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index eb70ca6c7145..fc6127cbea1f 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -170,6 +170,7 @@ static void kvm_assigned_dev_interrupt_work_handler(struct work_struct *work)
KVM_ASSIGNED_DEV_GUEST_MSI) {
assigned_device_msi_dispatch(assigned_dev);
enable_irq(assigned_dev->host_irq);
+ assigned_dev->host_irq_disabled = false;
}
mutex_unlock(&assigned_dev->kvm->lock);
kvm_put_kvm(assigned_dev->kvm);
@@ -181,8 +182,12 @@ static irqreturn_t kvm_assigned_dev_intr(int irq, void *dev_id)
(struct kvm_assigned_dev_kernel *) dev_id;
kvm_get_kvm(assigned_dev->kvm);
+
schedule_work(&assigned_dev->interrupt_work);
+
disable_irq_nosync(irq);
+ assigned_dev->host_irq_disabled = true;
+
return IRQ_HANDLED;
}
@@ -196,8 +201,16 @@ static void kvm_assigned_dev_ack_irq(struct kvm_irq_ack_notifier *kian)
dev = container_of(kian, struct kvm_assigned_dev_kernel,
ack_notifier);
+
kvm_set_irq(dev->kvm, dev->irq_source_id, dev->guest_irq, 0);
- enable_irq(dev->host_irq);
+
+ /* The guest irq may be shared so this ack may be
+ * from another device.
+ */
+ if (dev->host_irq_disabled) {
+ enable_irq(dev->host_irq);
+ dev->host_irq_disabled = false;
+ }
}
static void kvm_free_assigned_irq(struct kvm *kvm,