> -----Original Message-----
> From: Maxime Coquelin [mailto:maxime.coque...@redhat.com]
> Sent: Thursday, March 29, 2018 3:53 PM
> To: m...@redhat.com; Liu, Changpeng <changpeng....@intel.com>;
> marcandre.lur...@redhat.com; qemu-devel@nongnu.org
> Cc: Maxime Coquelin <maxime.coque...@redhat.com>
> Subject: [PATCH v3 1/2] vhost-user-blk: set config ops before vhost-user init
> 
> As soon as vhost-user init is done, the backend may send
> VHOST_USER_SLAVE_CONFIG_CHANGE_MSG, so let's set the
> notification callback before it.
> 
> Also, it will be used to know whether the device supports
> the config feature to advertize it or not.
> 
> Signed-off-by: Maxime Coquelin <maxime.coque...@redhat.com>
Acked-by: Changpeng Liu <changpeng....@intel.com>
> ---
>  hw/block/vhost-user-blk.c | 4 ++--
>  hw/virtio/vhost.c         | 1 -
>  2 files changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/hw/block/vhost-user-blk.c b/hw/block/vhost-user-blk.c
> index f840f07dfe..262baca432 100644
> --- a/hw/block/vhost-user-blk.c
> +++ b/hw/block/vhost-user-blk.c
> @@ -259,6 +259,8 @@ static void vhost_user_blk_device_realize(DeviceState
> *dev, Error **errp)
>      s->dev.vq_index = 0;
>      s->dev.backend_features = 0;
> 
> +    vhost_dev_set_config_notifier(&s->dev, &blk_ops);
> +
>      ret = vhost_dev_init(&s->dev, &s->chardev, VHOST_BACKEND_TYPE_USER, 0);
>      if (ret < 0) {
>          error_setg(errp, "vhost-user-blk: vhost initialization failed: %s",
> @@ -277,8 +279,6 @@ static void vhost_user_blk_device_realize(DeviceState
> *dev, Error **errp)
>          s->blkcfg.num_queues = s->num_queues;
>      }
> 
> -    vhost_dev_set_config_notifier(&s->dev, &blk_ops);
> -
>      return;
> 
>  vhost_err:
> diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c
> index 250f886acb..b6c314e350 100644
> --- a/hw/virtio/vhost.c
> +++ b/hw/virtio/vhost.c
> @@ -1451,7 +1451,6 @@ int vhost_dev_set_config(struct vhost_dev *hdev,
> const uint8_t *data,
>  void vhost_dev_set_config_notifier(struct vhost_dev *hdev,
>                                     const VhostDevConfigOps *ops)
>  {
> -    assert(hdev->vhost_ops);
>      hdev->config_ops = ops;
>  }
> 
> --
> 2.14.3


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