[Qemu-devel] Re: [PATCH] vhost: fix features ack

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

On Wed, Mar 31, 2010 at 09:20:31PM +0300, Michael S. Tsirkin wrote:
> From: David L Stevens <dlstevens@us.ibm.com>
> 
> vhost driver in qemu didn't ack features, and this happens
> to work because we don't really require any features. However,
> it's better not to rely on this. This patch passes features to
> vhost as guest acks them.
> 
> Signed-off-by: David L Stevens <dlstevens@us.ibm.com>
> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
> ---
> 
> Anthony, here's a fixup patch to address an issue in vhost
> patches. Incidentially, what's the status of the vhost patchset?
> 
> 
>  hw/virtio-net.c |    8 ++++++++
>  1 files changed, 8 insertions(+), 0 deletions(-)

Just making sure this patch does not get lost in the noise:
now that vhost net support is merged, please apply this
patch on top. Thanks!

> diff --git a/hw/virtio-net.c b/hw/virtio-net.c
> index 9ddd58c..4c7c46e 100644
> --- a/hw/virtio-net.c
> +++ b/hw/virtio-net.c
> @@ -218,6 +218,14 @@ static void virtio_net_set_features(VirtIODevice *vdev, uint32_t features)
>                          (features >> VIRTIO_NET_F_GUEST_ECN)  & 1,
>                          (features >> VIRTIO_NET_F_GUEST_UFO)  & 1);
>      }
> +    if (!n->nic->nc.peer ||
> +        n->nic->nc.peer->info->type != NET_CLIENT_TYPE_TAP) {
> +        return;
> +    }
> +    if (!tap_get_vhost_net(n->nic->nc.peer)) {
> +        return;
> +    }
> +    return vhost_net_ack_features(tap_get_vhost_net(n->nic->nc.peer), features);
>  }
>  
>  static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd,
> -- 
> 1.7.0.2.280.gc6f05