Re: [Qemu-devel] [PATCH v2 1/2] vhost-user-blk: set config ops before vhost-user init

[Liu, Changpeng]

> -----Original Message-----
> From: Maxime Coquelin [mailto:address@hidden
> Sent: Thursday, March 29, 2018 3:28 AM
> To: address@hidden; Liu, Changpeng <address@hidden>;
> address@hidden; address@hidden
> Cc: Maxime Coquelin <address@hidden>
> Subject: [PATCH v2 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 <address@hidden>
> ---
>  hw/block/vhost-user-blk.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 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);
Please also remove the line "assert(hdev->vhost_ops);" in function 
vhost_dev_set_config_notifier at vhost.c file.
> +
>      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:
> --
> 2.14.3