Re: [Qemu-devel] [RFC v2 0/8] monitor: allow per-monitor thread

[Daniel P. Berrange]

On Fri, Sep 08, 2017 at 01:49:41PM +0200, Markus Armbruster wrote:
> > I also see the other problem as keeping the management level
> > understanding of which commands are asynchronous; Dan's suggestion is
> > that command where the management layer specifies which commands it
> > expects to be asynchronous, and qemu responds with which ones actually
> > are.
> 
> "Command supports out-of-band dispatch" would be visible in
> query-qmp-schema.
> 
> Design alternative: either switching on out-of-band mode (see 6.)
> switches all out-of-band commands to out-of-band dispatch, or it
> doesn't, and the client has to request out-of-band dispatch explicitly.
> The explicit request could either be per execute (say send {'exec-oob':
> COMMAND-NAME ...} instead of {'execute': COMMAND-NAME...}), or per
> session, i.e. with a new command to enable oob dispatch for a list of
> oob-capable commands.
> 
> I figure explicit is safer, because it lets us make more commands
> oob-capable without upsetting existing oob-aware QMP clients.

Yep, this is fine too - it achieves the same end goals as the approach
I suggest. Namely

 - clients can detect which commands can do OOB (via the schema)
 - clients can choose which commands to run OOB (via exec vs exec-oob)

Regards,
Daniel
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