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

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Date:	Thu, 13 Oct 2011 09:33:52 +0200
From:	Borislav Petkov <bp@...64.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	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 06:49:51PM -0400, H. Peter Anvin wrote:
> The stickiest part of all of this is where to leave the microcode so the 
> kernel can get to it way early.  We could use the linked list, but that 
> would mean bootloader enabling;

Yep, started looking at that and it means grub legacy and grub2 enabling
at least.

> another idea was to stick it as a prefix 
> to the initramfs identified by a signature.

https://bugzilla.redhat.com/show_bug.cgi?id=179127

with the patch there you can do

initrd /initramfs-image1.gz /initramfs-image2.gz

which is exactly what we want.

Bottomline is, extending initrd handling to deal with multiple initrd
images might turn out to be easier to do than the linked list deal.

-- 
Regards/Gruss,
Boris.

Advanced Micro Devices GmbH
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