linux-kernel - Re: [PATCH 2/2] cpu: intel, amd: mask cleared cpuid features

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Message-ID: <500F4463.9050702@zytor.com>
Date:	Tue, 24 Jul 2012 17:57:07 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Vladimir Davydov <vdavydov@...allels.com>
CC:	Borislav Petkov <bp@...64.org>,
	Andre Przywara <andre.przywara@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Borislav Petkov <borislav.petkov@....com>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andreas Herrmann <andreas.herrmann3@....com>
Subject: Re: [PATCH 2/2] cpu: intel, amd: mask cleared cpuid features

On 07/24/2012 04:09 AM, Vladimir Davydov wrote:
> 
> We have not encountered this situation in our environments and I hope we
> won't :-)
> 
> But look, these CPUID functions cover majority of CPU features, don't
> they? So, most of "normal" apps inside VM will survive migration.
> Perhaps, some low-level utils won't. I guess that's why there are no
> MSRs for other levels provided by vendors.
> 

You will once Ivy Bridge becomes common.

	-hpa

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