linux-kernel - Re: [discuss] [patch] mtrr: fix issues with large addresses

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Message-Id: <45C85911.76E4.0078.0@novell.com>
Date:	Tue, 06 Feb 2007 09:31:45 +0000
From:	"Jan Beulich" <jbeulich@...ell.com>
To:	"Andi Kleen" <ak@...e.de>
Cc:	"Andreas Herrmann" <andreas.herrmann3@....com>,
	"Suresh B Siddha" <suresh.b.siddha@...el.com>,
	"Richard Gooch" <rgooch@...e-mbox.com>,
	<linux-kernel@...r.kernel.org>, <discuss@...-64.org>
Subject: Re: [discuss] [patch] mtrr: fix issues with large addresses

>>> Andi Kleen <ak@...e.de> 06.02.07 08:53 >>>
>On Monday 05 February 2007 23:50, Siddha, Suresh B wrote:
>> On Mon, Feb 05, 2007 at 06:19:59PM +0100, Andreas Herrmann wrote:
>> > o added check to restrict base address to 36 bit on i386
>> 
>> Why is this? It can go upto implemented physical bits, right?
>
>In theory it can, but Linux doesn't support it.

I don't think I remember a restriction here, at least not below 44 bits
(that's where pfn-s would need to become 64-bit wide).

Jan
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