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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 11:29:36 +0000 (GMT)
User-agent: Alpine 1.00 (SOC 882 2007-12-20)

On Thu, 27 Mar 2008, Avi Kivity wrote:

> Applied, but perhaps a patch to linux to avoid reads to write-only registers
> is needed as well.

 Linux performs reads to all registers written including this one 
deliberately using an RMW cycle to avoid triggering an erratum in some 
early Pentium integrated APICs.  Obviously it does not matter for most of 
the world as the workaround is build-time conditional, but you'll get it 
if you build a generic "runs everywhere" kernel.


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