linux-kernel - Re: [Bug 11388] New: 2.6.27-rc3 warns about MTRR range; only 3 of 16gb of memory is usable

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Date:	Thu, 21 Aug 2008 20:24:24 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Joshua Hoblitt" <josh@...litt.com>, "Ingo Molnar" <mingo@...e.hu>
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>,
	bugme-daemon@...zilla.kernel.org, linux-kernel@...r.kernel.org,
	j_kernel@...litt.com
Subject: Re: [Bug 11388] New: 2.6.27-rc3 warns about MTRR range; only 3 of 16gb of memory is usable

On Thu, Aug 21, 2008 at 7:26 PM, Yinghai Lu <yhlu.kernel@...il.com> wrote:
> On Thu, Aug 21, 2008 at 7:15 PM, Joshua Hoblitt <josh@...litt.com> wrote:
>> On Thu, Aug 21, 2008 at 06:55:58PM -0700, Yinghai Lu wrote:
>> address sizes   : 38 bits physical, 48 bits virtual
>
> good, the root cause is your bios not set mask correctly...
>
> it should set var mtrr like
>
> [    0.429971]  MSR00000200: 00000000d0000000
> [    0.433305]  MSR00000201: 0000000ff0000800
> ==> [    0.433305]  MSR00000201: 0000003ff0000800
>
> [    0.436638]  MSR00000202: 00000000e0000000
> [    0.439971]  MSR00000203: 0000000fe0000800
> ==> [    0.439971]  MSR00000203: 0000003fe0000800
>
> [    0.443304]  MSR00000204: 0000000000000006
> [    0.446637]  MSR00000205: 0000000c00000800
> ==> [    0.446637]  MSR00000205: 0000003c00000800
>
> [    0.449970]  MSR00000206: 0000000400000006
> [    0.453303]  MSR00000207: 0000000fe0000800
> ==>[    0.453303]  MSR00000207: 0000003fe0000800
>
> [    0.456636]  MSR00000208: 0000000420000006
> [    0.459970]  MSR00000209: 0000000ff0000800
> ==> [    0.459970]  MSR00000209: 0000003ff0000800
>
> you may talk to your BIOS vendor or system vendor to request one new
> updated BIOS.
>

or please try attached workaround patch. hope it works.

Ingo,
if it works, we need to push it for 2.6.27

YH

View attachment "work_aroun_mask.patch" of type "text/x-patch" (1340 bytes)