linux-kernel - [RFC PATCH 0/3] x86/cpufeatures: Re-arrange a few features and enumerate AVX512 BFLOAT16 intructions

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <1560459064-195037-1-git-send-email-fenghua.yu@intel.com>
Date:   Thu, 13 Jun 2019 13:51:01 -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>,
        "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: [RFC PATCH 0/3] 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 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.

Also remove x86_cache_max_rmid and x86_cache_occ_scale in cpuinfo_x86
to save memory space because they are only read once by resctrl during
boot time. Get the info directly from CPUID in resctrl initialization.

Fenghua Yu (3):
  x86/resctrl: Get max rmid and occupancy scale directly from CPUID
    instead of cpuinfo_x86
  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/include/asm/processor.h       |  3 --
 arch/x86/kernel/cpu/common.c           | 45 ++------------------------
 arch/x86/kernel/cpu/cpuid-deps.c       |  4 +++
 arch/x86/kernel/cpu/resctrl/internal.h |  2 +-
 arch/x86/kernel/cpu/resctrl/monitor.c  | 28 ++++++++++++++--
 arch/x86/kernel/cpu/scattered.c        |  4 +++
 arch/x86/kvm/cpuid.h                   |  2 --
 9 files changed, 51 insertions(+), 59 deletions(-)

-- 
2.19.1