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

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Message-ID: <4E95F711.2090004@zytor.com>
Date:	Wed, 12 Oct 2011 13:22:41 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	Borislav Petkov <bp@...64.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 10/12/2011 12:18 PM, Jeremy Fitzhardinge wrote:
> If there were a general shift to "this is how we're going to do
> microcode in the future", then Xen will happily go along for the ride.

It *is* how we want to do microcode in the future.  There is a prototype 
for the Intel hardware side here; we just haven't had time to finalize 
it partly because I got pulled onto the kernel.org situation.

> But for right now, this patch seems like the pragmatic solution.

No.

> I think the real question is where there's something objectionable about
> the patch itself?

"It does something that is slightly broken on real hardware and totally 
broken for a hypervisor and perpetuates it, while still needing enabling?"

	-hpa

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