# Re: \[RFC PATCH v5 12/26\] vhost: Route guest-\>host notification through shadow virtqueue

- From: Jason Wang \<hidden\>
- Date: 2021-11-02 05:39:48 
- List: virtualization
- Page: https://ratatoskr.run/virtualization/2021/11/14112487
- Thread: https://ratatoskr.run/qemu-devel/2021/10/14111674/t.md

```text

在 2021/10/30 上午2:35, Eugenio Pérez 写道:
> +/**
> + * 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

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```