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RE: [Xen-devel] [PATCH] FP fix for x86-64 xenlinux

To: "Keir Fraser" <Keir.Fraser@xxxxxxxxxxxx>
Subject: RE: [Xen-devel] [PATCH] FP fix for x86-64 xenlinux
From: "Nakajima, Jun" <jun.nakajima@xxxxxxxxx>
Date: Mon, 6 Jun 2005 01:23:08 -0700
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Thread-topic: [Xen-devel] [PATCH] FP fix for x86-64 xenlinux
Keir Fraser wrote:
> On 6 Jun 2005, at 08:02, Nakajima, Jun wrote:
>>> With this patch, # of testcase failures with LTP is < 5 (out of
>>> 800), almost same results as the native x86-64 Linux. The other two
>>> patches for LTP are coming soon; with these, all the testcases will
>>> pass (except the ones that fail on the native x86-64 Linux).
> Consider defining read/write_cr0 macros same as we do in
> arch/xen/i386. We set them the same as native (i.e., real accesses to
> %cr0) and then emulate in Xen. This will ensure that things like
> raid6 will work, which save/restore %cr0 as part of their fpu
> save/restore code. 
>   -- Keir

That's better. I'll send another patch. BTW, they are defined like the
below for x86 xenlinux:

#define read_cr0() \
#define write_cr0(x) \

We need to fix this as well. 

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