[dpdk-dev] [PATCH] vhost: call rte_vhost_enable_guest_notification only on enabled queues

[Loftus, Ciara]

> 
> If the vhost PMD were configured with more queues than the guest, the old
> code would segfault in rte_vhost_enable_guest_notification due to a NULL
> virtqueue pointer.
> 
> Fixes: ee584e9710b9 ("vhost: add driver on top of the library")
> Signed-off-by: Rich Lane <rich.lane at bigswitch.com>
> ---
>  drivers/net/vhost/rte_eth_vhost.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/vhost/rte_eth_vhost.c
> b/drivers/net/vhost/rte_eth_vhost.c
> index b1eb082..310cbef 100644
> --- a/drivers/net/vhost/rte_eth_vhost.c
> +++ b/drivers/net/vhost/rte_eth_vhost.c
> @@ -265,7 +265,6 @@ new_device(struct virtio_net *dev)
>  		vq->device = dev;
>  		vq->internal = internal;
>  		vq->port = eth_dev->data->port_id;
> -		rte_vhost_enable_guest_notification(dev, vq-
> >virtqueue_id, 0);
>  	}
>  	for (i = 0; i < eth_dev->data->nb_tx_queues; i++) {
>  		vq = eth_dev->data->tx_queues[i];
> @@ -274,9 +273,11 @@ new_device(struct virtio_net *dev)
>  		vq->device = dev;
>  		vq->internal = internal;
>  		vq->port = eth_dev->data->port_id;
> -		rte_vhost_enable_guest_notification(dev, vq-
> >virtqueue_id, 0);
>  	}
> 
> +	for (i = 0; i < dev->virt_qp_nb * VIRTIO_QNUM; i++)
> +		rte_vhost_enable_guest_notification(dev, i, 0);
> +
>  	dev->flags |= VIRTIO_DEV_RUNNING;
>  	dev->priv = eth_dev;
>  	eth_dev->data->dev_link.link_status = ETH_LINK_UP;
> --
> 1.9.1

I see the same issue, and verified that this patch solves it. Thanks!

Tested-by: Ciara Loftus <ciara.loftus at intel.com>

Thanks,
Ciara