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virtio-net: Update virtio-net curr_queue_pairs in vdpa backends 

It was returned as error before. Instead of it, simply update the
corresponding field so qemu can send it in the migration data.

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Acked-by: Si-Wei Liu <si-wei.liu@oracle.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Eugenio Pérez 2022-09-06 17:07:18 +02:00 committed by Jason Wang
parent 275ba561cd
commit ca8717f931
1 changed files with 7 additions and 12 deletions
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19
hw/net/virtio-net.c
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@ -1412,19 +1412,14 @@ static int virtio_net_handle_mq(VirtIONet *n, uint8_t cmd,
return VIRTIO_NET_ERR;
}
/* Avoid changing the number of queue_pairs for vdpa device in
* userspace handler. A future fix is needed to handle the mq
* change in userspace handler with vhost-vdpa. Let's disable
* the mq handling from userspace for now and only allow get
* done through the kernel. Ripples may be seen when falling
* back to userspace, but without doing it qemu process would
* crash on a recursive entry to virtio_net_set_status().
*/
if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_VDPA) {
return VIRTIO_NET_ERR;
}
n->curr_queue_pairs = queue_pairs;
if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_VDPA) {
/*
* Avoid updating the backend for a vdpa device: We're only interested
* in updating the device model queues.
*/
return VIRTIO_NET_OK;
}
/* stop the backend before changing the number of queue_pairs to avoid handling a
* disabled queue */
virtio_net_set_status(vdev, vdev->status);