Re: [PATCH v3 2/5] vhost_net: enable configure interrupt when vhost_net start

[Jason Wang <jasowang@redhat.com>]

On 2021/1/26 下午3:42, Cindy Lu wrote:
> While peer is vhost vdpa, setup the configure interrupt function
> vhost_net_start and release the resource when vhost_net_stop
>
> Signed-off-by: Cindy Lu <lulu@redhat.com>
> ---
>   hw/net/vhost_net.c | 19 ++++++++++++++++++-
>   1 file changed, 18 insertions(+), 1 deletion(-)
>
> diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c
> index 24d555e764..0660da474a 100644
> --- a/hw/net/vhost_net.c
> +++ b/hw/net/vhost_net.c
> @@ -345,6 +345,15 @@ int vhost_net_start(VirtIODevice *dev, NetClientState *ncs,
>           error_report("Error binding guest notifier: %d", -r);
>           goto err;
>       }
> +    if (ncs->peer && ncs->peer->info->type == NET_CLIENT_DRIVER_VHOST_VDPA) {
> +        if (k->set_config_notifiers) {
> +            r = k->set_config_notifiers(qbus->parent, true);
> +            if (r < 0) {
> +                error_report("Error binding config notifier: %d", -r);
> +                goto err;
> +            }
> +       }
> +    }
>   
>       for (i = 0; i < total_queues; i++) {
>           peer = qemu_get_peer(ncs, i);
> @@ -391,7 +400,15 @@ void vhost_net_stop(VirtIODevice *dev, NetClientState *ncs,
>       for (i = 0; i < total_queues; i++) {
>           vhost_net_stop_one(get_vhost_net(ncs[i].peer), dev);
>       }
> -
> +   if (ncs->peer && ncs->peer->info->type == NET_CLIENT_DRIVER_VHOST_VDPA) {
> +        if (k->set_config_notifiers) {


It looks to me that checking k->set_config_notifier is sufficient here.

Thanks


> +            r = k->set_config_notifiers(qbus->parent, false);
> +            if (r < 0) {
> +                error_report("Error unbinding config notifier: %d", -r);
> +            }
> +           assert(r >= 0);
> +        }
> +    }
>       r = k->set_guest_notifiers(qbus->parent, total_queues * 2, false);
>       if (r < 0) {
>           fprintf(stderr, "vhost guest notifier cleanup failed: %d\n", r);