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Date: Sat, 15 Dec 2012 15:17:05 -0800
From: "H. Peter Anvin" <hpa@zytor.com>
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To: Yinghai Lu <yinghai@kernel.org>
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Subject: Re: [tip:x86/microcode] x86/microcode_intel_early.c: Early update
 ucode on Intel's CPU
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On 12/15/2012 03:15 PM, Yinghai Lu wrote:
>>
>> That is for the kernel region itself (that code is actually unchanged from
>> the current code), and yes, we could cap that one to _end if there are
>> systems which have bugs in that area.  The dynamic page tables map 1G
>> aligned at a time.
>
> dynamic should be 2M too.
>
> AMD system:
>
> http://git.kernel.org/?p=linux/kernel/git/tip/tip.git;a=commitdiff;h=66520ebc2df3fe52eb4792f8101fac573b766baf
>
>   BIOS-e820: [mem 0x0000000100000000-0x000000e037ffffff] usable
>   BIOS-e820: [mem 0x000000e038000000-0x000000fcffffffff] reserved
>   BIOS-e820: [mem 0x0000010000000000-0x0000011ffeffffff] usable
>
> the hole is not 1G aligned.
>
> or HT region is from e040000000 ?
>

The HT region starts at 0xfd00000000 -- after that reserved region, so I 
have no idea what that particular system is trying to do or what is 
requirements are (nor what its MTRR setup is, since you didn't post it.)

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.