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

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Date:	Fri, 05 Sep 2014 08:07:03 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Toshi Kani <toshi.kani@...com>,
	Andy Lutomirski <luto@...capital.net>
CC:	Henrique de Moraes Holschuh <hmh@....eng.br>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, akpm@...uxfoundation.org,
	Arnd Bergmann <arnd@...db.de>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Juergen Gross <jgross@...e.com>,
	Stefan Bader <stefan.bader@...onical.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Subject: Re: [PATCH 1/5] x86, mm, pat: Set WT to PA4 slot of PAT MSR

On 09/05/2014 07:00 AM, Toshi Kani wrote:
> 
> That's a fine idea, but as Ingo also suggested, I am going to disable
> this feature on all Pentium 4 models.  That should give us a safety
> margin.  Using slot 4 has a benefit that it keeps the PAT setup
> consistent with Xen.      
> 

Slot 4 is also the maximally problematic one, because it is the one that
might be incorrectly invoked for the page tables themselves.

	-hpa


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