linux-kernel - Re: [PATCH v6 1/4] vdpa: Add resume operation

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Message-ID: <20230113100113.cdnkwrbqkktp3gnc@sgarzare-redhat>
Date:   Fri, 13 Jan 2023 11:01:13 +0100
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     sebastien.boeuf@...el.com
Cc:     linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, mst@...hat.com,
        jasowang@...hat.com, eperezma@...hat.com
Subject: Re: [PATCH v6 1/4] vdpa: Add resume operation

On Tue, Jan 03, 2023 at 11:51:05AM +0100, sebastien.boeuf@...el.com wrote:
>From: Sebastien Boeuf <sebastien.boeuf@...el.com>
>
>Add a new operation to allow a vDPA device to be resumed after it has
>been suspended. Trying to resume a device that wasn't suspended will
>result in a no-op.
>
>This operation is optional. If it's not implemented, the associated
>backend feature bit will not be exposed. And if the feature bit is not
>exposed, invoking this operation will return an error.
>
>Acked-by: Jason Wang <jasowang@...hat.com>
>Signed-off-by: Sebastien Boeuf <sebastien.boeuf@...el.com>
>---
> include/linux/vdpa.h | 6 +++++-
> 1 file changed, 5 insertions(+), 1 deletion(-)

Reviewed-by: Stefano Garzarella <sgarzare@...hat.com>

>
>diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h
>index 6d0f5e4e82c2..96d308cbf97b 100644
>--- a/include/linux/vdpa.h
>+++ b/include/linux/vdpa.h
>@@ -219,7 +219,10 @@ struct vdpa_map_file {
>  * @reset:			Reset device
>  *				@vdev: vdpa device
>  *				Returns integer: success (0) or error (< 0)
>- * @suspend:			Suspend or resume the device (optional)
>+ * @suspend:			Suspend the device (optional)
>+ *				@vdev: vdpa device
>+ *				Returns integer: success (0) or error (< 0)
>+ * @resume:			Resume the device (optional)
>  *				@vdev: vdpa device
>  *				Returns integer: success (0) or error (< 0)
>  * @get_config_size:		Get the size of the configuration space includes
>@@ -324,6 +327,7 @@ struct vdpa_config_ops {
> 	void (*set_status)(struct vdpa_device *vdev, u8 status);
> 	int (*reset)(struct vdpa_device *vdev);
> 	int (*suspend)(struct vdpa_device *vdev);
>+	int (*resume)(struct vdpa_device *vdev);
> 	size_t (*get_config_size)(struct vdpa_device *vdev);
> 	void (*get_config)(struct vdpa_device *vdev, unsigned int offset,
> 			   void *buf, unsigned int len);
>-- 
>2.37.2
>
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