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

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Message-ID: <CAE9FiQWbyA4BgNFsxipdn=Mgc5c5tdSKzwbP_0nvs8BTqR0QUQ@mail.gmail.com>
Date:	Wed, 19 Dec 2012 14:47:17 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Jacob Shin <jacob.shin@....com>, Borislav Petkov <bp@...en8.de>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	"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 Wed, Dec 19, 2012 at 2:25 PM, H. Peter Anvin <hpa@...or.com> wrote:
>
> The problem is that before we have awareness of the memory map, we need to
> map things in order to access them.  This is a big problem and right now
> there are ridiculous heuristics.  I have been working on mapping on demand,
> but there are concerns about the boundaries (i.e. what happens if the
> mapping spill over into a pit like this.)
>
> This kind of stuff is really not acceptable.  A region which will cause
> malfunction if prefetched should not be WB in the MTRR system (I include
> TOM* in that.)  The real question is what we can do to mitigate the damage.

on demand to only map 2M will help ?
or have to return to v6 version for-x86-boot ?
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