linux-kernel - Re: [PATCH 0/3] x86/microcode: support for microcode update in Xen dom0

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Date:	Wed, 12 Oct 2011 21:45:43 +0200
From:	Borislav Petkov <bp@...64.org>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	the arch/x86 maintainers <x86@...nel.org>,
	Tigran Aivazian <tigran@...azian.fsnet.co.uk>,
	Xen Devel <xen-devel@...ts.xensource.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 0/3] x86/microcode: support for microcode update in Xen
 dom0

On Wed, Oct 12, 2011 at 03:18:22PM -0400, Jeremy Fitzhardinge wrote:
> While doing the whole boot time multiboot thing may offer some small
> hypothetical technical advantages, it has the significant cost of just
> complicating the whole deployment and use story.

You simply can't call the need to apply ucode as early as possible a
"hypothetical techical advantage." Other issues like how to handle ucode
images and how to put them together and how distros distribute them
and whether xen minimizes the amount of "specialness" or not are only
secondary.

-- 
Regards/Gruss,
Boris.

Advanced Micro Devices GmbH
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