Re: [PATCH 0/7] vhost-user: call VHOST_USER_SET_VRING_ENABLE synchronously

[Laszlo Ersek <lersek@redhat.com>]

On 8/30/23 10:48, Stefano Garzarella wrote:
> On Sun, Aug 27, 2023 at 08:29:30PM +0200, Laszlo Ersek wrote:
>> The last patch in the series states and fixes the problem; prior patches
>> only refactor the code.
> 
> Thanks for the fix and great cleanup!
> 
> I fully reviewed the series and LGTM.
> 
> An additional step that we can take (not in this series) crossed my
> mind, though. In some places we repeat the following pattern:
> 
>     vhost_user_write(dev, &msg, NULL, 0);
>     ...
> 
>     if (reply_supported) {
>         return process_message_reply(dev, &msg);
>     }
> 
> So what about extending the vhost_user_write_msg() added in this series
> to support also this cases and remove some code.
> Or maybe integrate vhost_user_write_msg() in vhost_user_write().

Good idea, I'd just like someone else to do it -- and as you say, after
this series :)

This series is relatively packed with "thought" already (in the last
patch), plus a week ago I knew absolutely nothing about vhost /
vhost-user. (And, I read the whole blog series at
<https://www.redhat.com/en/virtio-networking-series> in 1-2 days, while
analyzing this issue, to understand the design of vhost.)

So I'd prefer keeping my first contribution in this area limited -- what
you are suggesting touches on some of the requests that require genuine
responses, and I didn't want to fiddle with those.

(I think your patch should be fine BTW!)

Laszlo