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x86/cpufeature: Enable RING3MWAIT for Knights Landing

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Enable ring 3 MONITOR/MWAIT for Intel Xeon Phi x200 codenamed Knights
Landing.

Presence of this feature cannot be detected automatically (by reading any
other MSR) therefore it is required to explicitly check for the family and
model of the CPU before attempting to enable it.

Signed-off-by: Grzegorz Andrejczuk <grzegorz.andrejczuk@intel.com>
Cc: Piotr.Luc@intel.com
Cc: dave.hansen@linux.intel.com
Link: http://lkml.kernel.org/r/1484918557-15481-5-git-send-email-grzegorz.andrejczuk@intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Grzegorz Andrejczuk
2017-01-20 14:22:36 +01:00
committed by Thomas Gleixner
parent 1d12d0ef01
commit e16fd002af
2 changed files with 41 additions and 0 deletions
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4
Documentation/admin-guide/kernel-parameters.txt
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@@ -3563,6 +3563,10 @@
rhash_entries= [KNL,NET]
Set number of hash buckets for route cache
ring3mwait=disable
[KNL] Disable ring 3 MONITOR/MWAIT feature on supported
CPUs.
ro [KNL] Mount root device read-only on boot
rodata= [KNL]