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

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Date:   Thu, 26 May 2022 17:32:06 +0200
From:   Eugenio Perez Martin <eperezma@...hat.com>
To:     Stefano Garzarella <sgarzare@...hat.com>
Cc:     "Michael S. Tsirkin" <mst@...hat.com>,
        kvm list <kvm@...r.kernel.org>,
        virtualization <virtualization@...ts.linux-foundation.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Jason Wang <jasowang@...hat.com>,
        netdev <netdev@...r.kernel.org>,
        Martin Petrus Hubertus Habets <martinh@...inx.com>,
        Martin Porter <martinpo@...inx.com>,
        Laurent Vivier <lvivier@...hat.com>,
        Pablo Cascon Katchadourian <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>,
        Cindy Lu <lulu@...hat.com>,
        Zhu Lingshan <lingshan.zhu@...el.com>,
        "Uminski, Piotr" <Piotr.Uminski@...el.com>,
        Si-Wei Liu <si-wei.liu@...cle.com>, ecree.xilinx@...il.com,
        "Dawar, Gautam" <gautam.dawar@....com>, habetsm.xilinx@...il.com,
        "Kamde, Tanuj" <tanuj.kamde@....com>,
        Harpreet Singh Anand <hanand@...inx.com>,
        Dinan Gunawardena <dinang@...inx.com>,
        Longpeng <longpeng2@...wei.com>
Subject: Re: [PATCH v4 1/4] vdpa: Add stop operation

On Thu, May 26, 2022 at 4:23 PM Stefano Garzarella <sgarzare@...hat.com> wrote:
>
> On Thu, May 26, 2022 at 02:43:35PM +0200, Eugenio Pérez wrote:
> >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)
>
> Sorry for just seeing this now, but if you have to send a v5, maybe we
> could use "resume" here instead of "not stop".
>

I agree it fits way better, I'll queue for the next :). Thanks!

> Thanks,
> Stefano
>
> >+ *                            Returns integer: success (0) or error (< 0)
> >  * @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
> >
>