[Devel] [PATCH hci-8.1] drivers/vhost/blk: add support for worker ioctls

[Andrey Zhadchenko]

Reviewed-by: Andrey Zhadchenko <andrey.zhadchenko at virtuozzo.com>

On 10/29/26 12:05, Alexander Ivanov wrote:
> Let userspace create vhost workers and bind them to vhost-blk
> virtqueues with the mainstream ioctls from c1ecd8e95007 ("vhost: allow
> userspace to create workers"), the same way d74b55e65502 ("vhost_scsi:
> add support for worker ioctls") does it for vhost-scsi.
> 
> VHOST_NEW_WORKER needs the device in vhost_task mode, so userspace has
> to issue VHOST_SET_FORK_FROM_OWNER with VHOST_FORK_OWNER_TASK before
> VHOST_SET_OWNER: our fork_from_owner_default is kthread.
> 
> https://virtuozzo.atlassian.net/browse/VSTOR-107537
> Feature: vhost-blk: in-kernel accelerator for virtio-blk guests
> 
> Suggested-by: Pavel Tikhomirov <ptikhomirov at virtuozzo.com>
> Signed-off-by: Alexander Ivanov <alexander.ivanov at virtuozzo.com>
> ---
>   drivers/vhost/blk.c | 8 ++++++++
>   1 file changed, 8 insertions(+)
> 
> diff --git a/drivers/vhost/blk.c b/drivers/vhost/blk.c
> index b170439a1806..ab3b8c4c2d5a 100644
> --- a/drivers/vhost/blk.c
> +++ b/drivers/vhost/blk.c
> @@ -909,6 +909,14 @@ static long vhost_blk_ioctl(struct file *f, unsigned int ioctl,
>   		return vhost_blk_set_features(blk, features);
>   	case VHOST_RESET_OWNER:
>   		return vhost_blk_reset_owner(blk);
> +	case VHOST_NEW_WORKER:
> +	case VHOST_FREE_WORKER:
> +	case VHOST_ATTACH_VRING_WORKER:
> +	case VHOST_GET_VRING_WORKER:
> +		mutex_lock(&blk->dev.mutex);
> +		ret = vhost_worker_ioctl(&blk->dev, ioctl, argp);
> +		mutex_unlock(&blk->dev.mutex);
> +		return ret;
>   	default:
>   		mutex_lock(&blk->dev.mutex);
>   		ret = vhost_dev_ioctl(&blk->dev, ioctl, argp);