On Mon, Jul 05, 2021 at 07:14:29PM +0200, Kevin Wolf wrote:
> dev->max_queues was never initialised for backends that don't support
> VHOST_USER_PROTOCOL_F_MQ, so it would use 0 as the maximum number of
> queues to check against and consequently fail for any such backend.
>
> Set it to 1 if the backend doesn't have multiqueue support.
>
> Fixes: c90bd505a3e8210c23d69fecab9ee6f56ec4a161
> Signed-off-by: Kevin Wolf <kw...@redhat.com>
Reviewed-by: Raphael Norwitz <raphael.norw...@nutanix.com>
> ---
> hw/virtio/vhost-user.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c
> index 1ac4a2ebec..29ea2b4fce 100644
> --- a/hw/virtio/vhost-user.c
> +++ b/hw/virtio/vhost-user.c
> @@ -1913,7 +1913,10 @@ static int vhost_user_backend_init(struct vhost_dev
> *dev, void *opaque,
> if (err < 0) {
> return -EPROTO;
> }
> + } else {
> + dev->max_queues = 1;
> }
> +
> if (dev->num_queues && dev->max_queues < dev->num_queues) {
> error_setg(errp, "The maximum number of queues supported by the "
> "backend is %" PRIu64, dev->max_queues);
> --
> 2.31.1
>
