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[Qemu-devel] Re: [PATCH] ignore reads to the EOI register.
From: |
Maciej W. Rozycki |
Subject: |
[Qemu-devel] Re: [PATCH] ignore reads to the EOI register. |
Date: |
Thu, 27 Mar 2008 13:36:10 +0000 (GMT) |
User-agent: |
Alpine 1.00 (SOC 882 2007-12-20) |
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
Re: [Qemu-devel] [PATCH] ignore reads to the EOI register., Aurelien Jarno, 2008/03/27