Re: [PATCH RFC WIP] x86/paravirt: add register-saving thunks to reducecaller register pressure

[Jeremy Fitzhardinge]

Zachary Amsden wrote:
> > Standard calling convention is:
> >          arguments          return      scratch
> > x86-32   eax edx ecx        eax         ?
> >     
>
> ecx, edx
>   

OK, no scratch beyond the arg regs.

> > XXX Deal with VMI.  What's their calling convention?
> >     
>
> Enable/Disable have no clobbers at all.
> Save clobbers only return value, %eax
> Restore also clobbers nothing.
>   

OK, they can be plugged in directly then.  Use __PV_IS_CALLEE_SAVE(func) 
to wrap it up in the right type.

> The patching code has gotten quite complex with the 32/64 union; let me
> apply it first and see before I comment on the patch.
>   

OK.  I just posted updated versions of this series, so make sure you 
comment on that one.

   J
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