linux-kernel - Re: [PATCH v11 0/5] Enabling Ring 3 MONITOR/MWAIT feature for Knights Landing

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Message-ID: <20170103220935.GB22548@amd>
Date:   Tue, 3 Jan 2017 23:09:35 +0100
From:   Pavel Machek <pavel@....cz>
To:     Grzegorz Andrejczuk <grzegorz.andrejczuk@...el.com>
Cc:     tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
        x86@...nel.org, linux-kernel@...r.kernel.org, Piotr.Luc@...el.com,
        dave.hansen@...ux.intel.com
Subject: Re: [PATCH v11 0/5] Enabling Ring 3 MONITOR/MWAIT feature for
 Knights Landing

On Tue 2016-12-20 14:48:41, Grzegorz Andrejczuk wrote:
> Following patches enable the use of the feature that allows
> the Intel Xeon Phi x200 devices to use MONITOR/MWAIT instructions
> outside ring 0. It allows userspace applications to use
> more efficient synchronization operations, which improves performance
> and energy efficiency.

What kind of security holes does it bring us?

rdseed can be used for two processes to communicate when they should
not (serious problem for android). Can this be used for something similar?

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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