Re: [PATCH] virtio_balloon: check virtqueue_add_outbuf() return value

[Bo Liu (刘波)-浪潮信息]

Adding this patch can avoid unnecessary VM exits and reduce the number of VM exits

-----邮件原件-----
发件人: Michael S. Tsirkin <mst@xxxxxxxxxx> 
发送时间: 2022年5月27日 18:58
收件人: Bo Liu (刘波)-浪潮信息 <liubo03@xxxxxxxxxx>
抄送: david@xxxxxxxxxx; jasowang@xxxxxxxxxx; virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx
主题: Re: [PATCH] virtio_balloon: check virtqueue_add_outbuf() return value

On Fri, May 27, 2022 at 10:43:30AM +0000, Bo Liu (刘波)-浪潮信息 wrote:
> The purpose of this patch is, virtqueue_add_outbuf() adding data to 
> virtqueue may succeed or fail. If successful, it will call 
> virtqueue_kick() to notifie the host backend driver, but if the 
> virtqueue_add_outbuf() fails, the data is not successfully added to 
> the virtqueue, and the host back-end driver does not need to be notified for processing.
> 
> Thanks.

Why is it a problem if we do?

--
MST

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