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

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Message-ID: <500FDC9E.3010504@parallels.com>
Date:	Wed, 25 Jul 2012 15:46:38 +0400
From:	Vladimir Davydov <vdavydov@...allels.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	Andre Przywara <andre.przywara@....com>,
	Borislav Petkov <bp@...64.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.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>,
	Pavel Emelianov <xemul@...allels.com>,
	Konstantin Khorenko <khorenko@...allels.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>
Subject: Re: [PATCH 2/2] cpu: intel, amd: mask cleared cpuid features

On 07/25/2012 03:31 PM, Alan Cox wrote:
> On Wed, 25 Jul 2012 14:31:30 +0400
> Vladimir Davydov<vdavydov@...allels.com>  wrote:
>
>> On 07/24/2012 04:44 PM, Alan Cox wrote:
>>>> This approach does not need any kernel support (except for the
>>>> /proc/cpuinfo filtering). Does this address the issues you have?
>>> You can do the /proc/cpuinfo filtering in user space too
>>>
>> How?
> bind mount your own normal file over the top or a FUSE file

In general, we've agreed that wiring CPUID masking into the kernel was 
not a good idea.

We will try to virtualize /proc/cpuinfo as well as other /proc stuff in 
mainstream.

Thank you for your time and feedback.
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