Re: [PATCH] vdpa: fix VHOST_BACKEND_F_IOTLB_ASID flag check

["Michael S. Tsirkin" <mst@redhat.com>]

On Tue, Jan 17, 2023 at 11:53:08AM +0100, Eugenio Pérez wrote:
> VHOST_BACKEND_F_IOTLB_ASID is the feature bit, not the bitmask. Since
> the device under test also provided VHOST_BACKEND_F_IOTLB_MSG_V2 and
> VHOST_BACKEND_F_IOTLB_BATCH, this went unnoticed.
> 
> Fixes: c1a1008685 ("vdpa: always start CVQ in SVQ mode if possible")
> Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
> Acked-by: Jason Wang <jasowang@redhat.com>

Reviewed-by: Michael S. Tsirkin <mst@redhat.com>

Jason are you merging this?

> ---
> Originally on SUSPEND series, but it is a fix that it is worth to send
> and apply individually:
> https://lists.nongnu.org/archive/html/qemu-devel/2023-01/msg02574.html
> 
> ---
>  net/vhost-vdpa.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/vhost-vdpa.c b/net/vhost-vdpa.c
> index 1a13a34d35..de5ed8ff22 100644
> --- a/net/vhost-vdpa.c
> +++ b/net/vhost-vdpa.c
> @@ -384,7 +384,7 @@ static int vhost_vdpa_net_cvq_start(NetClientState *nc)
>              g_strerror(errno), errno);
>          return -1;
>      }
> -    if (!(backend_features & VHOST_BACKEND_F_IOTLB_ASID) ||
> +    if (!(backend_features & BIT_ULL(VHOST_BACKEND_F_IOTLB_ASID)) ||
>          !vhost_vdpa_net_valid_svq_features(v->dev->features, NULL)) {
>          return 0;
>      }
> --
> 2.31.1