linux-kernel - Re: [PATCH 3/4] vhost-vdpa: uAPI to stop the device

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Message-ID: <20220521083630.GA5298@gmail.com>
Date:   Sat, 21 May 2022 09:36:30 +0100
From:   Martin Habets <habetsm.xilinx@...il.com>
To:     Eugenio Pérez <eperezma@...hat.com>
Cc:     virtualization@...ts.linux-foundation.org,
        Jason Wang <jasowang@...hat.com>, kvm@...r.kernel.org,
        "Michael S. Tsirkin" <mst@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Stefano Garzarella <sgarzare@...hat.com>,
        Longpeng <longpeng2@...wei.com>,
        Zhu Lingshan <lingshan.zhu@...el.com>, martinh@...inx.com,
        hanand@...inx.com, Si-Wei Liu <si-wei.liu@...cle.com>,
        dinang@...inx.com, Eli Cohen <elic@...dia.com>, lvivier@...hat.com,
        pabloc@...inx.com, gautam.dawar@....com,
        Xie Yongji <xieyongji@...edance.com>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        tanuj.kamde@....com, Wu Zongyong <wuzongyong@...ux.alibaba.com>,
        martinpo@...inx.com, lulu@...hat.com, ecree.xilinx@...il.com,
        Parav Pandit <parav@...dia.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Zhang Min <zhang.min9@....com.cn>
Subject: Re: [PATCH 3/4] vhost-vdpa: uAPI to stop the device

On Fri, May 20, 2022 at 07:23:24PM +0200, Eugenio Pérez wrote:
> The ioctl adds support for stop the device from userspace.
> 
> Signed-off-by: Eugenio Pérez <eperezma@...hat.com>
> ---
>  drivers/vhost/vdpa.c       | 18 ++++++++++++++++++
>  include/uapi/linux/vhost.h |  3 +++
>  2 files changed, 21 insertions(+)
> 
> diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
> index a325bc259afb..da4a8c709bc1 100644
> --- a/drivers/vhost/vdpa.c
> +++ b/drivers/vhost/vdpa.c
> @@ -478,6 +478,21 @@ static long vhost_vdpa_get_vqs_count(struct vhost_vdpa *v, u32 __user *argp)
>  	return 0;
>  }
>  
> +static long vhost_vdpa_stop(struct vhost_vdpa *v, u32 __user *argp)
> +{
> +	struct vdpa_device *vdpa = v->vdpa;
> +	const struct vdpa_config_ops *ops = vdpa->config;
> +	int stop;
> +
> +	if (!ops->stop)
> +		return -EOPNOTSUPP;
> +
> +	if (copy_to_user(argp, &stop, sizeof(stop)))

You want to use copy_from_user() here.

Martin

> +		return -EFAULT;
> +
> +	return ops->stop(vdpa, stop);
> +}
> +
>  static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd,
>  				   void __user *argp)
>  {
> @@ -649,6 +664,9 @@ static long vhost_vdpa_unlocked_ioctl(struct file *filep,
>  	case VHOST_VDPA_GET_VQS_COUNT:
>  		r = vhost_vdpa_get_vqs_count(v, argp);
>  		break;
> +	case VHOST_STOP:
> +		r = vhost_vdpa_stop(v, argp);
> +		break;
>  	default:
>  		r = vhost_dev_ioctl(&v->vdev, cmd, argp);
>  		if (r == -ENOIOCTLCMD)
> diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h
> index cab645d4a645..e7526968ab0c 100644
> --- a/include/uapi/linux/vhost.h
> +++ b/include/uapi/linux/vhost.h
> @@ -171,4 +171,7 @@
>  #define VHOST_VDPA_SET_GROUP_ASID	_IOW(VHOST_VIRTIO, 0x7C, \
>  					     struct vhost_vring_state)
>  
> +/* Stop or resume a device so it does not process virtqueue requests anymore */
> +#define VHOST_STOP			_IOW(VHOST_VIRTIO, 0x7D, int)
> +
>  #endif
> -- 
> 2.27.0