From: Pavel Machek <pavel@ucw.cz>
To: Grzegorz Andrejczuk <grzegorz.andrejczuk@intel.com>
Cc: tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com,
x86@kernel.org, linux-kernel@vger.kernel.org,
Piotr.Luc@intel.com, dave.hansen@linux.intel.com
Subject: Re: [PATCH v11 0/5] Enabling Ring 3 MONITOR/MWAIT feature for Knights Landing
Date: Tue, 3 Jan 2017 23:09:35 +0100 [thread overview]
Message-ID: <20170103220935.GB22548@amd> (raw)
In-Reply-To: <1482241726-27310-1-git-send-email-grzegorz.andrejczuk@intel.com>
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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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next prev parent reply other threads:[~2017-01-03 22:09 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-20 13:48 [PATCH v11 0/5] Enabling Ring 3 MONITOR/MWAIT feature for Knights Landing Grzegorz Andrejczuk
2016-12-20 13:48 ` [PATCH v11 1/5] x86/msr: add MSR_MISC_FEATURE_ENABLES and RING3MWAIT bit Grzegorz Andrejczuk
2016-12-21 20:23 ` Thomas Gleixner
2016-12-22 9:10 ` Andrejczuk, Grzegorz
2016-12-20 13:48 ` [PATCH v11 2/5] x86/elf: add HWCAP2 to expose ring 3 MONITOR/MWAIT Grzegorz Andrejczuk
2016-12-20 13:48 ` [PATCH v11 3/5] x86/cpufeature: add RING3MWAIT to CPU features Grzegorz Andrejczuk
2016-12-20 13:48 ` [PATCH v11 4/5] x86/cpufeature: enable RING3MWAIT for Knights Landing Grzegorz Andrejczuk
2016-12-20 18:31 ` [Patch " Grzegorz Andrejczuk
2016-12-21 20:24 ` Thomas Gleixner
2016-12-22 10:19 ` Andrejczuk, Grzegorz
2016-12-22 11:05 ` Thomas Gleixner
2016-12-22 11:37 ` Andrejczuk, Grzegorz
2016-12-22 14:20 ` Thomas Gleixner
2016-12-23 18:19 ` Andrejczuk, Grzegorz
2016-12-20 13:48 ` [PATCH v11 5/5] x86/cpufeature: enable RING3MWAIT for Knights Mill Grzegorz Andrejczuk
2017-01-03 22:09 ` Pavel Machek [this message]
2017-01-09 8:59 ` [PATCH v11 0/5] Enabling Ring 3 MONITOR/MWAIT feature for Knights Landing Thomas Gleixner
2017-01-09 9:12 ` Pavel Machek
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