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

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Message-ID: <20070206161624.GI8665@alberich.amd.com>
Date:	Tue, 6 Feb 2007 17:16:24 +0100
From:	"Andreas Herrmann" <andreas.herrmann3@....com>
To:	"Jan Beulich" <jbeulich@...ell.com>
cc:	"Andi Kleen" <ak@...e.de>,
	"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

On Tue, Feb 06, 2007 at 09:31:45AM +0000, Jan Beulich wrote:
> >>> 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
> 

Hi all,

shame on me.
Wanted to fix and interface issue where base address is truncated
at 44 bit in mtrr_write().

(And just thought 36 bit would be more than enough for that 32 bit
Linux version :)


Regards,

Andreas

-- 
AMD Saxony, Dresden, Germany
Operating System Research Center



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