[Qemu-devel] Re: [PATCH] ignore reads to the EOI register.

[Maciej W. Rozycki]

On Thu, 27 Mar 2008, Andi Kleen wrote:

> It would be quite possible to make the cycle conditional on a
> cpufeatures.h quirk flag that is only set on P5. Just would need to
> out of line a few functions to avoid code bloat.

 Exactly what I suggested at the LKML -- you could even go down to a list 
of steppings affected as an RMW cycle is unnecessarily expensive (we only 
need interrupt atomicity, but there is no way to disable the LOCK# 
implication of "xchg").

  Maciej