Re: [PATCH v4 0/4] Introduce 'yank' oob qmp command to recover from hanging qemu

[Stefan Hajnoczi]

On Sat, Jun 06, 2020 at 09:30:38PM +0200, Lukas Straub wrote:
> On Mon, 25 May 2020 17:44:12 +0200
> Lukas Straub <lukasstraub2@web.de> wrote:
> 
> > Hello Everyone,
> > In many cases, if qemu has a network connection (qmp, migration, chardev, 
> > etc.)
> > to some other server and that server dies or hangs, qemu hangs too.
> > These patches introduce the new 'yank' out-of-band qmp command to recover 
> > from
> > these kinds of hangs. The different subsystems register callbacks which get
> > executed with the yank command. For example the callback can shutdown() a
> > socket. This is intended for the colo use-case, but it can be used for other
> > things too of course.
> > 
> > Regards,
> > Lukas Straub
> 
> Hello Everyone,
> Can this be reviewed, it would be cool to have this in qemu 5.1.

Please see my reply to a previous version. Code that executes in the oob
environment needs to take special precautions, this needs to be
documented so that yank API users know what the limitations are.

Stefan

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