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

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Message-ID: <500FD24B.4040703@parallels.com>
Date:	Wed, 25 Jul 2012 15:02:35 +0400
From:	Vladimir Davydov <vdavydov@...allels.com>
To:	Andre Przywara <andre.przywara@....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 02:58 PM, Andre Przywara wrote:
> 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.

If CPUs go online/offline?

>
> Regards,
> Andre.
>

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