linux-kernel - [PATCH v2 0/2] x86/cpufeatures: Re-arrange a few features and enumerate AVX512 BFLOAT16 intructions

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Date:   Mon, 17 Jun 2019 11:00:14 -0700
From:   Fenghua Yu <fenghua.yu@...el.com>
To:     "Thomas Gleixner" <tglx@...utronix.de>,
        "Ingo Molnar" <mingo@...hat.com>, "Borislav Petkov" <bp@...en8.de>,
        "H Peter Anvin" <hpa@...or.com>,
        "Christopherson Sean J" <sean.j.christopherson@...el.com>,
        "Paolo Bonzini" <pbonzini@...hat.com>,
        "Radim Krcmar" <rkrcmar@...hat.com>,
        "Ravi V Shankar" <ravi.v.shankar@...el.com>
Cc:     "linux-kernel" <linux-kernel@...r.kernel.org>,
        "x86" <x86@...nel.org>, Fenghua Yu <fenghua.yu@...el.com>
Subject: [PATCH v2 0/2] x86/cpufeatures: Re-arrange a few features and enumerate AVX512 BFLOAT16 intructions

To enumerate AVX512 BFLOAT16 feature CPUID.7.1:EAX[5] and other future
features in CPUID.7.1:EAX, Boris suggests to create a new pure feature
bits word.

Boris further suggests to re-define word 11 as a scattered features word
and move the four X86_FEATURE_CQM_* features in existing word 11 and
word 12 into the new word 11. Then use word 12 to hold features in
CPUID.7.1:EAX including AVX512 BFLOAT16 instructions.

Change Log:
v2:
- Remove patch 0001 and keep x86_cache_max_rmid and x86_cache_occ_scale
  in cpuinfo_x86 per Thomas Gleixner's comment. 

v1:
Address all comments from Borislav Petkov:
- Re-define feature word 11 as a scattered features word and move the
  four X86_FEATURE_CQM_* features into the word
- Re-define feature word 12 to hold CPUID.7.1:EAX including BFLOAT16
- Name a dummy leaf 12 in cpuid_leafs in patch 0002 to avoid bisect
  error
- Simplify code to get number of rmid and monitoring scale in
  rdt_get_mon_l3_config()

Fenghua Yu (2):
  x86/cpufeatures: Combine word 11 and 12 into new scattered features
    word 11
  x86/cpufeatures: Enumerate new AVX512 BFLOAT16 instructions

 arch/x86/include/asm/cpufeature.h  |  4 +--
 arch/x86/include/asm/cpufeatures.h | 18 ++++++----
 arch/x86/kernel/cpu/common.c       | 56 ++++++++++++++++--------------
 arch/x86/kernel/cpu/cpuid-deps.c   |  4 +++
 arch/x86/kernel/cpu/scattered.c    |  4 +++
 arch/x86/kvm/cpuid.h               |  2 --
 6 files changed, 51 insertions(+), 37 deletions(-)

-- 
2.19.1