We don't reset proxy->vqs[].{num|desc[]|avail[]|used[]}. This means if
a driver enable the vq without setting vq address after reset. The old
addresses were leaked. Fixing this by resetting modern vq meta data
during device reset.

Cc: qemu-stable@nongnu.org
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 hw/virtio/virtio-pci.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
index b76f3f6..7c36b9c 100644
--- a/hw/virtio/virtio-pci.c
+++ b/hw/virtio/virtio-pci.c
@@ -1857,6 +1857,10 @@ static void virtio_pci_reset(DeviceState *qdev)
 
     for (i = 0; i < VIRTIO_QUEUE_MAX; i++) {
         proxy->vqs[i].enabled = 0;
+        proxy->vqs[i].num = 0;
+        proxy->vqs[i].desc[0] = proxy->vqs[i].desc[1] = 0;
+        proxy->vqs[i].avail[0] = proxy->vqs[i].avail[1] = 0;
+        proxy->vqs[i].used[0] = proxy->vqs[i].used[1] = 0;
     }
 }
 
-- 
2.7.4

On Tue, Mar 14, 2017 at 03:25:05PM +0800, Jason Wang wrote:
> We don't reset proxy->vqs[].{num|desc[]|avail[]|used[]}. This means if
> a driver enable the vq without setting vq address after reset. The old
> addresses were leaked. Fixing this by resetting modern vq meta data
> during device reset.
> 
> Cc: qemu-stable@nongnu.org
> Signed-off-by: Jason Wang <jasowang@redhat.com>
> ---
>  hw/virtio/virtio-pci.c | 4 ++++
>  1 file changed, 4 insertions(+)

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>