Virtualization - Nov 2021 - [RFC PATCH v5 12/26] vhost: Route guest->host notification through shadow virtqueue

? 2021/10/30 ??2:35, Eugenio P?rez ??:
> +/**
> + * Enable or disable shadow virtqueue in a vhost vdpa device.
> + *
> + * This function is idempotent, to call it many times with the same value
for
> + * enable_svq will simply return success.
> + *
> + * @v       Vhost vdpa device
> + * @enable  True to set SVQ mode
> + * @errp    Error pointer
> + */
> +void vhost_vdpa_enable_svq(struct vhost_vdpa *v, bool enable, Error
**errp)
> +{

What happens if vhost_vpda is not stated when we try to enable svq? 
Another note is that, the vhost device could be stopped and started 
after svq is enabled/disabled. We need to deal with them.

Thanks