linux-kernel - Re: [tip:x86/microcode] x86/microcode_intel_early.c: Early update ucode on Intel's CPU

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Date:	Sat, 15 Dec 2012 15:15:02 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Borislav Petkov <bp@...en8.de>,
	"Yu, Fenghua" <fenghua.yu@...el.com>,
	"mingo@...nel.org" <mingo@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"linux-tip-commits@...r.kernel.org" 
	<linux-tip-commits@...r.kernel.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Stefano Stabellini <Stefano.Stabellini@...citrix.com>
Subject: Re: [tip:x86/microcode] x86/microcode_intel_early.c: Early update
 ucode on Intel's CPU

On Sat, Dec 15, 2012 at 2:17 PM, H. Peter Anvin <hpa@...or.com> wrote:
> On 12/15/2012 02:13 PM, Yinghai Lu wrote:
>>
>>
>> AMD system could have all mem between TOLM and TOHM all WB, and don
>> need to set them in MTRRs entries.
>>
>
> I include the TOM2 mechanism in the overall umbrella of MTRRs for this
> purpose.
>
>
>> and also your switchover change that handle cross 1G, and 512g, and it
>> is not 1G aligned.
>> for example, if kernel at 4095G+512M, it will map from 4095G+512M to
>> 4096G + 512M.
>
>
> 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 ?
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