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From: Paolo Bonzini <pbonzini@redhat.com>
Date: Wed, 02 Nov 2011 17:25:05 +0100
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Subject: Re: [Qemu-devel] Multiple instances of Qemu on Windows multicore
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To: qemu-devel@nongnu.org

On 11/02/2011 04:38 PM, Fabien Chouteau wrote:
> Hello fellow Qemu aficionados,
>
> On Windows, Qemu sets the affinity mask in order to run all thread on
> CPU0, with this comment in the code (os-win32.c:182):
>
>      /* Note: cpu_interrupt() is currently not SMP safe, so we force
>         QEMU to run on a single CPU */
>
> This was added by Fabrice Bellard in 2006 (git show a8e5ac33d).
>
> I can't find/understand any reason for this CPU affinity restriction.

Have you tried looking for a justification in the mailing lists?  Also, 
I suppose you have tested without the affinity mask and it works?

Offhand I cannot think of why that would be needed.

Paolo