Re: [PATCH 4/10] Trivial: Make decode_register() static

[Anthony Liguori <anthony-rdkfGonbjUSkNkDKm+mE6A@public.gmane.org>]

Gregory Haskins wrote:
> On Tue, 2007-07-17 at 23:16 +1000, Rusty Russell wrote:
>   
>> I have shied away from touching x86_emulate.c (it could definitely use
>> some love, but it is forked from the Xen code, and it would be more
>> productive to cross-merge fixes).
>>     
>
> On this topic, here's an idea I have been kicking around for a while:
>
> If the x86_emulate code is so buggy/incomplete, and the QEMU one seems
> to be able to generally handle most situations...could we simply exit to
> userspace and use the qemu emulator somehow?  I realize the overhead is
> greater, but slow+working is > fast+broken in my book ;)
>
> Perhaps a hybrid solution would work?  E.g. exit to qemu emulator when
> the in-kernel stuff hits a mis-emulation point (do we realize this
> consciously in the code, or only after the guest crashes?) 
>   

SMP is really tricky in this environment.  The code that QEMU generates 
doesn't guarantee atomicity of instructions so if you have one CPU 
running in QEMU and another running on bare metal and they both were 
attempting to access a spin lock things would break down pretty quickly.

Regards,

Anthony Liguori

> I'm not really sure if this is plausible.  Its just something I was
> thinking about.
>
> Regards,
> -Greg
>
>
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