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

From Pavel Machek <pavel@ucw.cz>
Newsgroups linux.kernel
Subject Re: [PATCH v11 0/5] Enabling Ring 3 MONITOR/MWAIT feature for Knights Landing
Date 2017-01-03 23:20 +0100
Message-ID <sVFAZ-4dw-5@gated-at.bofh.it> (permalink)
References <sQsXL-6e4-7@gated-at.bofh.it>
Organization linux.* mail to news gateway

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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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[PATCH v11 0/5] Enabling Ring 3 MONITOR/MWAIT feature for Knights Landing Grzegorz Andrejczuk <grzegorz.andrejczuk@intel.com> - 2016-12-20 14:50 +0100
  [PATCH v11 4/5] x86/cpufeature: enable RING3MWAIT for Knights Landing Grzegorz Andrejczuk <grzegorz.andrejczuk@intel.com> - 2016-12-20 14:50 +0100
    [Patch v11 4/5] x86/cpufeature: enable RING3MWAIT for Knights Landing Grzegorz Andrejczuk <grzegorz.andrejczuk@intel.com> - 2016-12-20 19:40 +0100
      Re: [Patch v11 4/5] x86/cpufeature: enable RING3MWAIT for Knights  Landing Thomas Gleixner <tglx@linutronix.de> - 2016-12-21 21:30 +0100
        RE: [Patch v11 4/5] x86/cpufeature: enable RING3MWAIT for Knights  Landing "Andrejczuk, Grzegorz" <grzegorz.andrejczuk@intel.com> - 2016-12-22 11:30 +0100
          RE: [Patch v11 4/5] x86/cpufeature: enable RING3MWAIT for Knights  Landing Thomas Gleixner <tglx@linutronix.de> - 2016-12-22 12:10 +0100
            RE: [Patch v11 4/5] x86/cpufeature: enable RING3MWAIT for Knights  Landing "Andrejczuk, Grzegorz" <grzegorz.andrejczuk@intel.com> - 2016-12-22 12:40 +0100
              RE: [Patch v11 4/5] x86/cpufeature: enable RING3MWAIT for Knights  Landing Thomas Gleixner <tglx@linutronix.de> - 2016-12-22 15:30 +0100
                RE: [Patch v11 4/5] x86/cpufeature: enable RING3MWAIT for Knights  Landing "Andrejczuk, Grzegorz" <grzegorz.andrejczuk@intel.com> - 2016-12-23 19:20 +0100
  [PATCH v11 2/5] x86/elf: add HWCAP2 to expose ring 3 MONITOR/MWAIT Grzegorz Andrejczuk <grzegorz.andrejczuk@intel.com> - 2016-12-20 14:50 +0100
  [PATCH v11 5/5] x86/cpufeature: enable RING3MWAIT for Knights Mill Grzegorz Andrejczuk <grzegorz.andrejczuk@intel.com> - 2016-12-20 15:00 +0100
  [PATCH v11 3/5] x86/cpufeature: add RING3MWAIT to CPU features Grzegorz Andrejczuk <grzegorz.andrejczuk@intel.com> - 2016-12-20 15:10 +0100
  [PATCH v11 1/5] x86/msr: add MSR_MISC_FEATURE_ENABLES and RING3MWAIT bit Grzegorz Andrejczuk <grzegorz.andrejczuk@intel.com> - 2016-12-20 15:20 +0100
    Re: [PATCH v11 1/5] x86/msr: add MSR_MISC_FEATURE_ENABLES and  RING3MWAIT bit Thomas Gleixner <tglx@linutronix.de> - 2016-12-21 21:30 +0100
      RE: [PATCH v11 1/5] x86/msr: add MSR_MISC_FEATURE_ENABLES and  RING3MWAIT bit "Andrejczuk, Grzegorz" <grzegorz.andrejczuk@intel.com> - 2016-12-22 10:20 +0100
  Re: [PATCH v11 0/5] Enabling Ring 3 MONITOR/MWAIT feature for  Knights Landing Pavel Machek <pavel@ucw.cz> - 2017-01-03 23:20 +0100
    Re: [PATCH v11 0/5] Enabling Ring 3 MONITOR/MWAIT feature for Knights  Landing Thomas Gleixner <tglx@linutronix.de> - 2017-01-09 10:10 +0100
      Re: [PATCH v11 0/5] Enabling Ring 3 MONITOR/MWAIT feature for  Knights Landing Pavel Machek <pavel@ucw.cz> - 2017-01-09 10:20 +0100

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