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List:       qemu-discuss
Subject:    Re: How to realize multi-threading or multi-process for QOM
From:       Alex =?utf-8?Q?Benn=C3=A9e?= <alex.bennee () linaro ! org>
Date:       2021-10-19 15:02:36
Message-ID: 8735oxyrbs.fsf () linaro ! org
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Hiroko Shimizu <hiroko07168@gmail.com> writes:

> Hello,
> 
> I would like QOM to do QOM's process independently.

I'm not sure what this means. QOM is the QEMU Object Model which is
basically our plain C version of objects. Are you in fact referring to
QMP which is the serialised management interface used by VMMs?

> I make a memory device as QOM which execute some process according to the command \
> specified by firmware, so MemoryRegionOps functions are called back when reading \
> and writing. I would like to make the process of the MemoryRegionOps functions
> independent because the real memory device do.
> 
> I think multi-threading or multi-process is useful for this problem. But, how do \
> you realize multi-threadning? I use option "-accel tcg,thread=multi" for executing \
> QEMU, but it didn't work.

That option is for selecting MTTCG - which is using a host thread for
each simulated vCPU. It should be enabled automatically when the
host/guest combination allow for it. 

> 
> Could you give me some information how to solve this issue?

https://qemu.readthedocs.io/en/latest/system/multi-process.html

As far as I know lsi53c895a is the only device that currently supports
running the emulation in a separate process. I'd start looking at that.

> 
> Best regard, 
> Hiroko


-- 
Alex Bennée


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