[PATCH 2/9] KVM: Separate update irq to a single function

Sheng Yang
2008-11-24T06:36:38Z

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

Signed-off-by: Sheng Yang <sheng@linux.intel.com>
---
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 8966fd1..ef2f03c 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:
--
1.5.4.5