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

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Message-ID: <6684d9ac-52a7-483a-8eaf-bfc79de484c1@email.android.com>
Date:	Sat, 15 Dec 2012 13:31:35 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Yinghai Lu <yinghai@...nel.org>,
	"H. Peter Anvin" <hpa@...ux.intel.com>
CC:	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

The mem hole at 1T should not be marked cachable in the MTRRs.

Yinghai Lu <yinghai@...nel.org> wrote:

>On Sat, Dec 15, 2012 at 11:30 AM, H. Peter Anvin <hpa@...ux.intel.com>
>wrote:
>> What is the point of only managing 2M at a time?  Now you have to
>have
>> more conditionals and you don't get any more memory efficiency.
>
>We don't need to, because real_data is less than 2M, and ramdisk is
>about 16M.
>
>Also if we set map too large, could have chance to cover mem hole near
>1T for AMD HT system.
>
>>
>> Filling arbitrarily into the brk is not acceptable... the brk is an
>O(1)
>> area and all brk allocations need to be reserved at compile time, so
>the
>> overflow handling is still necessary.
>
>if run out of BRK, we will get panic, because early_make_pgtable will
>return -1.
>
>and current BRK already have 64 slop space.
>
>BTW, did you look at smp boot problem with early_level4_pgt version?
>
>Yinghai

-- 
Sent from my mobile phone. Please excuse brevity and lack of formatting.
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