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

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Message-ID: <50D246BB.9010800@zytor.com>
Date:	Wed, 19 Dec 2012 14:59:07 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Yinghai Lu <yinghai@...nel.org>
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 12/19/2012 02:47 PM, Yinghai Lu wrote:
> 
> on demand to only map 2M will help ?
> or have to return to v6 version for-x86-boot ?
> 

Why would 2M be inherently better than 1G?  I realize it works for the
*one particular system* that you have a specimen for, but that is not a
sensible approach for architecture.

The problem remains no matter how you slice it; we need a general
solution.  The fact that this system was ever built reflects a number of
critical failures that should be surprising but sadly are not.

	-hpa

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