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

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Message-ID: <20220526142318.mi2kfywbpvuky4lw@sgarzare-redhat>
Date:   Thu, 26 May 2022 16:23:18 +0200
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     Eugenio Pérez <eperezma@...hat.com>
Cc:     "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, martinh@...inx.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: Re: [PATCH v4 1/4] vdpa: Add stop operation

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".

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
>