Re: [Qemu-devel] [PATCH 3/6] hypertrace: [*-user] Add QEMU-side proxy to "guest_hypertrace" event

[Stefan Hajnoczi]

On Sun, Aug 21, 2016 at 02:15:31PM +0200, Lluís Vilanova wrote:
> > Can this approach be made thread-safe?
> 
> > If not then it would be good to consider the problem right away and
> > switch to something that is thread-safe, even if it depends on the
> > target architecture.
> 
> Kind of. The easiest solution is to have each thread have an mmap of its own 
> of
> the device (and moving qemu_control_{0,1} into CPUState). This would be
> completely explicit and easy to understand.

Yes.  I don't know if the TCG and -user folks will accept the SIGSEGV
approach, but I'd be okay with it if the multi-threading issue is solved
by 1 device per thread.

Stefan

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