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

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Message-ID: <500FD158.2070503@amd.com>
Date:	Wed, 25 Jul 2012 12:58:32 +0200
From:	Andre Przywara <andre.przywara@....com>
To:	Vladimir Davydov <vdavydov@...allels.com>
CC:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	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 12:31 PM, Vladimir Davydov 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?

I wanted to write the same reply yesterday, but followed the hint in 
Alan's previous mail:
# mount --bind /dev/shm/faked_cpuinfo /somepath/proc/cpuinfo

I checked it, it works even with chroots and is not visible from within.

Regards,
Andre.

-- 
Andre Przywara
AMD-Operating System Research Center (OSRC), Dresden, Germany

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