[Qemu-devel] [PATCH V2] virtio: Fix no interrupt when not creating msi controller

[Shannon Zhao]

From: Shannon Zhao <shannon.z...@linaro.org>

For ARM virt machine, if we use virt-2.7 which will not create ITS node,
the virtio-net can not recieve interrupts so it can't get ip address
through dhcp.
This fixes commit 83d768b(virtio: set ISR on dataplane notifications).

Signed-off-by: Shannon Zhao <shannon.z...@linaro.org>
---
V2: Factor out a common function instead of duplicating code
---
 hw/virtio/virtio.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index aa4f38f..00e8f74 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -1441,6 +1441,12 @@ void virtio_notify_irqfd(VirtIODevice *vdev, VirtQueue 
*vq)
     event_notifier_set(&vq->guest_notifier);
 }
 
+static void virtio_irq(VirtQueue *vq)
+{
+    virtio_set_isr(vq->vdev, 0x1);
+    virtio_notify_vector(vq->vdev, vq->vector);
+}
+
 void virtio_notify(VirtIODevice *vdev, VirtQueue *vq)
 {
     if (!virtio_should_notify(vdev, vq)) {
@@ -1448,8 +1454,7 @@ void virtio_notify(VirtIODevice *vdev, VirtQueue *vq)
     }
 
     trace_virtio_notify(vdev, vq);
-    virtio_set_isr(vq->vdev, 0x1);
-    virtio_notify_vector(vdev, vq->vector);
+    virtio_irq(vq);
 }
 
 void virtio_notify_config(VirtIODevice *vdev)
@@ -2082,7 +2087,7 @@ static void 
virtio_queue_guest_notifier_read(EventNotifier *n)
 {
     VirtQueue *vq = container_of(n, VirtQueue, guest_notifier);
     if (event_notifier_test_and_clear(n)) {
-        virtio_notify_vector(vq->vdev, vq->vector);
+        virtio_irq(vq);
     }
 }
 
-- 
2.0.4