linux-kernel - Re: [PATCH v2 3/4] vhost-vdpa: uAPI to stop the device

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Message-ID: <CACGkMEsZSTgsgYkg5HhpJ62pKFTr6mtiNwYJa8E+r4RMTRuU8A@mail.gmail.com>
Date:   Wed, 25 May 2022 10:51:04 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Eugenio Pérez <eperezma@...hat.com>
Cc:     netdev <netdev@...r.kernel.org>,
        virtualization <virtualization@...ts.linux-foundation.org>,
        "Michael S. Tsirkin" <mst@...hat.com>, kvm <kvm@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Parav Pandit <parav@...dia.com>,
        Zhang Min <zhang.min9@....com.cn>,
        Harpreet Singh Anand <hanand@...inx.com>,
        Zhu Lingshan <lingshan.zhu@...el.com>, tanuj.kamde@....com,
        "Dawar, Gautam" <gautam.dawar@....com>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Xie Yongji <xieyongji@...edance.com>,
        Dinan Gunawardena <dinang@...inx.com>,
        habetsm.xilinx@...il.com, Eli Cohen <elic@...dia.com>,
        Pablo Cascon Katchadourian <pabloc@...inx.com>,
        Laurent Vivier <lvivier@...hat.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Cindy Lu <lulu@...hat.com>,
        Wu Zongyong <wuzongyong@...ux.alibaba.com>,
        ecree.xilinx@...il.com, "Uminski, Piotr" <Piotr.Uminski@...el.com>,
        Martin Porter <martinpo@...inx.com>,
        Stefano Garzarella <sgarzare@...hat.com>,
        Si-Wei Liu <si-wei.liu@...cle.com>,
        Longpeng <longpeng2@...wei.com>,
        Martin Petrus Hubertus Habets <martinh@...inx.com>
Subject: Re: [PATCH v2 3/4] vhost-vdpa: uAPI to stop the device

On Wed, May 25, 2022 at 1:06 AM Eugenio Pérez <eperezma@...hat.com> 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 32713db5831d..a5d33bad92f9 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_from_user(&stop, argp, sizeof(stop)))
> +               return -EFAULT;
> +
> +       return ops->stop(vdpa, stop);
> +}
> +
>  static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd,
>                                    void __user *argp)
>  {
> @@ -650,6 +665,9 @@ 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)
> +

Unless we know it's a vhost general uAPI, let's use VHOST_VDPA_STOP here.

Thanks

>  #endif
> --
> 2.27.0
>