linux-kernel - Re: [PATCH v5 00/12] x86/microcode: Early load microcode

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Message-ID: <50E5C47B.6060707@zytor.com>
Date:	Thu, 03 Jan 2013 09:48:43 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Konrad Rzeszutek Wilk <konrad@...nel.org>
CC:	Fenghua Yu <fenghua.yu@...el.com>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Asit K Mallick <asit.k.mallick@...el.com>,
	Tigran Aivazian <tigran@...azian.fsnet.co.uk>,
	Yinghai Lu <yinghai@...nel.org>,
	Andreas Herrmann <andreas.herrmann3@....com>,
	Borislav Petkov <borislav.petkov@....com>,
	linux-kernel <linux-kernel@...r.kernel.org>, x86 <x86@...nel.org>
Subject: Re: [PATCH v5 00/12] x86/microcode: Early load microcode

On 01/03/2013 09:44 AM, Konrad Rzeszutek Wilk wrote:
>
> A couple of questions - why the usage of native_[read|write]_msr? I get the
> __native_cpuid variant, but I am not sure I understand why you are using
> the native_* variants. Especially as this code ends up being called on
> Xen and lguest (at least on 64-bit) and probably should go through the
> paravirt interfaces.
>

For Xen, the early microcode update should be done in the hypervisor launch.

However, if you have a more specific flow in mind please clarify.  Keep 
in mind Xen is largely a black box to non-Xen developers
(#include <stdrant.h>).

	-hpa

P.S. Since when is lguest 64-bit?  Did I miss something?

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

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