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Re: How to realize multi-threading or multi-process for QOM

From: Alex Bennée
Subject: Re: How to realize multi-threading or multi-process for QOM
Date: Tue, 19 Oct 2021 16:02:36 +0100
User-agent: mu4e 1.7.0; emacs 28.0.60

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?


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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