diff options
| -rw-r--r-- | virt/kvm/kvm_main.c | 68 |
1 files changed, 38 insertions, 30 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 8966fd13e84..ef2f03cf42c 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -176,6 +176,41 @@ void kvm_free_all_assigned_devices(struct kvm *kvm) } } +static int assigned_device_update_intx(struct kvm *kvm, + struct kvm_assigned_dev_kernel *adev, + struct kvm_assigned_irq *airq) +{ + if (adev->irq_requested) { + adev->guest_irq = airq->guest_irq; + adev->ack_notifier.gsi = airq->guest_irq; + return 0; + } + + if (irqchip_in_kernel(kvm)) { + if (!capable(CAP_SYS_RAWIO)) + return -EPERM; + + if (airq->host_irq) + adev->host_irq = airq->host_irq; + else + adev->host_irq = adev->dev->irq; + adev->guest_irq = airq->guest_irq; + adev->ack_notifier.gsi = airq->guest_irq; + + /* Even though this is PCI, we don't want to use shared + * interrupts. Sharing host devices with guest-assigned devices + * on the same interrupt line is not a happy situation: there + * are going to be long delays in accepting, acking, etc. + */ + if (request_irq(adev->host_irq, kvm_assigned_dev_intr, + 0, "kvm_assigned_intx_device", (void *)adev)) + return -EIO; + } + + adev->irq_requested = true; + return 0; +} + static int kvm_vm_ioctl_assign_irq(struct kvm *kvm, struct kvm_assigned_irq *assigned_irq) @@ -210,39 +245,12 @@ static int kvm_vm_ioctl_assign_irq(struct kvm *kvm, else match->irq_source_id = r; } - } else { - match->guest_irq = assigned_irq->guest_irq; - match->ack_notifier.gsi = assigned_irq->guest_irq; - mutex_unlock(&kvm->lock); - return 0; } - if (irqchip_in_kernel(kvm)) { - if (!capable(CAP_SYS_RAWIO)) { - r = -EPERM; - goto out_release; - } - - if (assigned_irq->host_irq) - match->host_irq = assigned_irq->host_irq; - else - match->host_irq = match->dev->irq; - match->guest_irq = assigned_irq->guest_irq; - match->ack_notifier.gsi = assigned_irq->guest_irq; - - /* Even though this is PCI, we don't want to use shared - * interrupts. Sharing host devices with guest-assigned devices - * on the same interrupt line is not a happy situation: there - * are going to be long delays in accepting, acking, etc. - */ - if (request_irq(match->host_irq, kvm_assigned_dev_intr, 0, - "kvm_assigned_device", (void *)match)) { - r = -EIO; - goto out_release; - } - } + r = assigned_device_update_intx(kvm, match, assigned_irq); + if (r) + goto out_release; - match->irq_requested = true; mutex_unlock(&kvm->lock); return r; out_release: |