If guest has made some buffers available during double check,
but the total buffer size available is lower than @bufsize,
notify the guest with the latest available idx(event idx)
seen by the host.

Fixes: 06b12970174 ("virtio-net: fix network stall under load")
Signed-off-by: wencheng Yang <east.moutain.yang@gmail.com>
---
 hw/net/virtio-net.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index 9c7e85caea..23c6c8c898 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -1654,6 +1654,7 @@ static int virtio_net_has_buffers(VirtIONetQueue *q, int bufsize)
         if (virtio_queue_empty(q->rx_vq) ||
             (n->mergeable_rx_bufs &&
              !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) {
+            virtio_queue_set_notification(q->rx_vq, 1);
             return 0;
         }
     }
-- 
2.39.0