linux-kernel - [PATCH v3 0/4] Enabling Ring 3 MONITOR/MWAIT feature for Knights Landing

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Date:   Thu, 13 Oct 2016 16:02:21 +0200
From:   Grzegorz Andrejczuk <grzegorz.andrejczuk@...el.com>
To:     tglx@...utronix.de, mingo@...hat.com, hpa@...or.com, x86@...nel.org
Cc:     bp@...e.de, dave.hansen@...ux.intel.com,
        linux-kernel@...r.kernel.org, lukasz.daniluk@...el.com,
        james.h.cownie@...el.com, jacob.jun.pan@...el.com,
        Grzegorz Andrejczuk <grzegorz.andrejczuk@...el.com>
Subject: [PATCH v3 0/4]  Enabling Ring 3 MONITOR/MWAIT feature for Knights Landing

These patches enable Intel Xeon Phi x200 feature to use MONITOR/MWAIT
instruction in ring 3 (userspace) Patches set MSR 0x140 for all logical CPUs.
Then expose it as CPU feature and introduces elf HWCAP capability for x86.
Reference (the solution is temporary MSR definition will be in next SDM document):
https://software.intel.com/en-us/blogs/2016/10/06/intel-xeon-phi-product-family-x200-knl-user-mode-ring-3-monitor-and-mwait

v2:
Check MSR before wrmsrl
Shortened names
Used Word 3 for feature init_scattered_cpuid_features()
Fixed commit messages

v3:
Included Daves and Thomas comments

Grzegorz Andrejczuk (4):
  Add R3MWAIT register and bit to msr-info.h
  Add enabling of the R3 MWAIT during boot for KNL
  Add hwcap2 for x86
  Add R3MWAIT to CPU features

 arch/x86/include/asm/cpufeatures.h |  2 ++
 arch/x86/include/asm/elf.h         |  9 +++++++++
 arch/x86/include/asm/msr-index.h   |  5 +++++
 arch/x86/include/uapi/asm/hwcap.h  |  7 +++++++
 arch/x86/kernel/cpu/common.c       |  6 ++++++
 arch/x86/kernel/cpu/intel.c        | 33 +++++++++++++++++++++++++++++++++
 6 files changed, 62 insertions(+)
 create mode 100644 arch/x86/include/uapi/asm/hwcap.h

-- 
2.5.1