From: liujunjie <liujunji...@huawei.com>
Before, we did not clear callback like handle_output when delete
the virtqueue which may result be segmentfault.
The scene is as follows:
1. Start a vm with multiqueue vhost-net,
2. then we write VIRTIO_PCI_GUEST_FEATURES in PCI configuration to
triger multiqueue disable in this vm which will delete the virtqueue.
In this step, the tx_bh is deleted but the callback virtio_net_handle_tx_bh
still exist.
3. Finally, we write VIRTIO_PCI_QUEUE_NOTIFY in PCI configuration to
notify the deleted virtqueue. In this way, virtio_net_handle_tx_bh
will be called and qemu will be crashed.
Although the way described above is uncommon, we had better reinforce it.
CC: qemu-sta...@nongnu.org
Signed-off-by: liujunjie <liujunji...@huawei.com>
Signed-off-by: Jason Wang <jasow...@redhat.com>
---
hw/virtio/virtio.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index 94f5c8e..8da00a1 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -1612,6 +1612,8 @@ void virtio_del_queue(VirtIODevice *vdev, int n)
vdev->vq[n].vring.num = 0;
vdev->vq[n].vring.num_default = 0;
+ vdev->vq[n].handle_output = NULL;
+ vdev->vq[n].handle_aio_output = NULL;
}
static void virtio_set_isr(VirtIODevice *vdev, int value)
--
2.5.0
