linux-kernel - Re: [PATCH v4 1/4] vdpa: Add stop operation

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Date:   Wed, 1 Jun 2022 08:53:18 +0200
From:   Eugenio Perez Martin <eperezma@...hat.com>
To:     Eli Cohen <elic@...dia.com>
Cc:     "Michael S. Tsirkin" <mst@...hat.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Jason Wang <jasowang@...hat.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "martinh@...inx.com" <martinh@...inx.com>,
        Stefano Garzarella <sgarzare@...hat.com>,
        "martinpo@...inx.com" <martinpo@...inx.com>,
        "lvivier@...hat.com" <lvivier@...hat.com>,
        "pabloc@...inx.com" <pabloc@...inx.com>,
        Parav Pandit <parav@...dia.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Xie Yongji <xieyongji@...edance.com>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Zhang Min <zhang.min9@....com.cn>,
        Wu Zongyong <wuzongyong@...ux.alibaba.com>,
        "lulu@...hat.com" <lulu@...hat.com>,
        Zhu Lingshan <lingshan.zhu@...el.com>,
        "Piotr.Uminski@...el.com" <Piotr.Uminski@...el.com>,
        Si-Wei Liu <si-wei.liu@...cle.com>,
        "ecree.xilinx@...il.com" <ecree.xilinx@...il.com>,
        "gautam.dawar@....com" <gautam.dawar@....com>,
        "habetsm.xilinx@...il.com" <habetsm.xilinx@...il.com>,
        "tanuj.kamde@....com" <tanuj.kamde@....com>,
        "hanand@...inx.com" <hanand@...inx.com>,
        "dinang@...inx.com" <dinang@...inx.com>,
        Longpeng <longpeng2@...wei.com>
Subject: Re: [PATCH v4 1/4] vdpa: Add stop operation

On Wed, Jun 1, 2022 at 7:35 AM Eli Cohen <elic@...dia.com> wrote:
>
> > From: Eugenio Pérez <eperezma@...hat.com>
> > Sent: Thursday, May 26, 2022 3:44 PM
> > To: Michael S. Tsirkin <mst@...hat.com>; kvm@...r.kernel.org; virtualization@...ts.linux-foundation.org; linux-kernel@...r.kernel.org;
> > Jason Wang <jasowang@...hat.com>; netdev@...r.kernel.org
> > Cc: martinh@...inx.com; Stefano Garzarella <sgarzare@...hat.com>; martinpo@...inx.com; lvivier@...hat.com; pabloc@...inx.com;
> > Parav Pandit <parav@...dia.com>; Eli Cohen <elic@...dia.com>; Dan Carpenter <dan.carpenter@...cle.com>; Xie Yongji
> > <xieyongji@...edance.com>; Christophe JAILLET <christophe.jaillet@...adoo.fr>; Zhang Min <zhang.min9@....com.cn>; Wu Zongyong
> > <wuzongyong@...ux.alibaba.com>; lulu@...hat.com; Zhu Lingshan <lingshan.zhu@...el.com>; Piotr.Uminski@...el.com; Si-Wei Liu <si-
> > wei.liu@...cle.com>; ecree.xilinx@...il.com; gautam.dawar@....com; habetsm.xilinx@...il.com; tanuj.kamde@....com;
> > hanand@...inx.com; dinang@...inx.com; Longpeng <longpeng2@...wei.com>
> > Subject: [PATCH v4 1/4] vdpa: Add stop operation
> >
> > This operation is optional: It it's not implemented, backend feature bit
> > will not be exposed.
> >
> > Signed-off-by: Eugenio Pérez <eperezma@...hat.com>
> > ---
> >  include/linux/vdpa.h | 6 ++++++
> >  1 file changed, 6 insertions(+)
> >
> > diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h
> > index 15af802d41c4..ddfebc4e1e01 100644
> > --- a/include/linux/vdpa.h
> > +++ b/include/linux/vdpa.h
> > @@ -215,6 +215,11 @@ struct vdpa_map_file {
> >   * @reset:                   Reset device
> >   *                           @vdev: vdpa device
> >   *                           Returns integer: success (0) or error (< 0)
> > + * @stop:                    Stop or resume the device (optional, but it must
> > + *                           be implemented if require device stop)
> > + *                           @vdev: vdpa device
> > + *                           @stop: stop (true), not stop (false)
> > + *                           Returns integer: success (0) or error (< 0)
>
> I assume after successful "stop" the device is guaranteed to stop processing descriptors and after resume it may process descriptors?
> If that is so, I think it should be clear in the change log.
>

Yes.

It's better described in the changelog of vdpa sim change, maybe it's
better to move here.

Thanks!

> >   * @get_config_size:         Get the size of the configuration space includes
> >   *                           fields that are conditional on feature bits.
> >   *                           @vdev: vdpa device
> > @@ -316,6 +321,7 @@ struct vdpa_config_ops {
> >       u8 (*get_status)(struct vdpa_device *vdev);
> >       void (*set_status)(struct vdpa_device *vdev, u8 status);
> >       int (*reset)(struct vdpa_device *vdev);
> > +     int (*stop)(struct vdpa_device *vdev, bool stop);
> >       size_t (*get_config_size)(struct vdpa_device *vdev);
> >       void (*get_config)(struct vdpa_device *vdev, unsigned int offset,
> >                          void *buf, unsigned int len);
> > --
> > 2.31.1
>