Re: [PATCH 1/5] x86, mm, pat: Set WT to PA4 slot of PAT MSR

From: H. Peter Anvin
Date: Thu Sep 04 2014 - 16:22:24 EST

On 09/04/2014 01:11 PM, Henrique de Moraes Holschuh wrote:
> I am worried of uncharted territory, here. I'd actually advocate for not
> enabling the upper four PAT entries on IA-32 at all, unless Windows 9X / XP
> is using them as well. Is this a real concern, or am I being overly
> cautious?

It is extremely unlikely that we'd have PAT issues in 32-bit mode and
not in 64-bit mode on the same CPU.

As far as I know, the current blacklist rule is very conservative due to
lack of testing more than anything else.


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