linux-kernel - Re: [PATCH v2] virtio_vdpa: Support surprise removal of virtio vdpa device

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Message-ID: <20220111071135-mutt-send-email-mst@kernel.org>
Date:   Tue, 11 Jan 2022 07:12:41 -0500
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     dongsheng li <lidongsheng@...udpu.com>
Cc:     jasowang@...hat.com, virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, wangwei@...udpu.com
Subject: Re: [PATCH v2] virtio_vdpa: Support surprise removal of virtio vdpa
 device

On Tue, Jan 11, 2022 at 02:55:27PM +0800, dongsheng li wrote:
> When virtio vdpa device removed, the abnormal damage of the device cannot be
> perceived normally, which will cause problems similar to:
> 
> Commit 43bb40c5b926 ("virtio_pci: Support surprise removal of
> virtio pci device")
> Hence, add the ability to abort the command on surprise removal
> 
> Signed-off-by: dongsheng li <lidongsheng@...udpu.com>

If you don't mkae changes you can carry forward acks.

> ---
>  drivers/virtio/virtio_vdpa.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/virtio/virtio_vdpa.c b/drivers/virtio/virtio_vdpa.c
> index f85f860bc10b..a5cebad09320 100644
> --- a/drivers/virtio/virtio_vdpa.c
> +++ b/drivers/virtio/virtio_vdpa.c
> @@ -396,6 +396,7 @@ static void virtio_vdpa_remove(struct vdpa_device *vdpa)
>  {
>  	struct virtio_vdpa_device *vd_dev = vdpa_get_drvdata(vdpa);
>  
> +	virtio_break_device(&vd_dev->vdev);

My comment on graceful removal stands. E.g. a storage device
will want to flush out writes if possible not drop them.

>  	unregister_virtio_device(&vd_dev->vdev);
>  }
>  
> -- 
> 2.17.1