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Commit 00e3ed39 authored by Sheng Yang's avatar Sheng Yang Committed by Avi Kivity
Browse files

KVM: Separate update irq to a single function 



Separate INTx enabling part to a independence function, so that we can add MSI
enabling part easily.

Signed-off-by: default avatarSheng Yang <sheng@linux.intel.com>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent 342ffb93

virt/kvm/kvm_main.c

+38 −30
Original line number Diff line number Diff line
@@ -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;

	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: