linux-kernel - [PATCH v4 0/7] x86: infrastructure to enable FSGSBASE

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Date:   Wed, 20 Jun 2018 16:14:59 -0700
From:   "Chang S. Bae" <chang.seok.bae@...el.com>
To:     Andy Lutomirski <luto@...nel.org>,
        "H . Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>
Cc:     Andi Kleen <ak@...ux.intel.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Markus T Metzger <markus.t.metzger@...el.com>,
        Ravi Shankar <ravi.v.shankar@...el.com>,
        "Chang S . Bae" <chang.seok.bae@...el.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH v4 0/7] x86: infrastructure to enable FSGSBASE

Given feedbacks from [1], it was suggested to separate two parts
and to (re-)submit this patchset first.

To facilitate FSGSBASE, helper functions and refactoring work
are incorporated. Also, it includes Andy's fix for accurate
FS/GS base read and cleanup for the vDSO initialization.

Changes from V3 [4]:
* Unify CPU number initialization
* Rebase on 4.18-rc1

Changes from V2 [3]:
* Bisect the CPU number initialization patch
* Drop patches for introducing i386 CPU_NUMBER and switching
write_rdtscp_aux() to use wrmsr_safe()

Changes from V1 [2]:
* Rename the x86-64 CPU_NUMBER segment from PER_CPU
* Add i386 CPU_NUMBER equivalent to x86-64 at GDT entry 23
* Add additional helper function to store CPU number
* Switch write_rdtscp_aux() to use wrmsr_safe()

[1] FSGSBASE patch set V2: https://lkml.org/lkml/2018/5/31/686
[2] infrastructure for FSGSBASE V1: https://lkml.org/lkml/2018/6/4/887
[3] V2: https://lkml.org/lkml/2018/6/6/582
[4] V3: https://lkml.org/lkml/2018/6/7/975

Andy Lutomirski (1):
  x86/fsgsbase/64: Make ptrace read FS/GS base accurately

Chang S. Bae (6):
  x86/fsgsbase/64: Introduce FS/GS base helper functions
  x86/fsgsbase/64: Use FS/GS base helpers in core dump
  x86/fsgsbase/64: Factor out load FS/GS segments from __switch_to
  x86/segments/64: Rename PER_CPU segment to CPU_NUMBER
  x86/vdso: Introduce CPU number helper functions
  x86/vdso: Move out the CPU number store

 arch/x86/entry/vdso/vgetcpu.c   |   4 +-
 arch/x86/entry/vdso/vma.c       |  38 +--------
 arch/x86/include/asm/elf.h      |   6 +-
 arch/x86/include/asm/fsgsbase.h |  47 +++++++++++
 arch/x86/include/asm/segment.h  |  33 +++++++-
 arch/x86/include/asm/vgtod.h    |   4 +-
 arch/x86/kernel/cpu/common.c    |  28 +++++++
 arch/x86/kernel/process_64.c    | 181 +++++++++++++++++++++++++++++++---------
 arch/x86/kernel/ptrace.c        |  28 ++-----
 9 files changed, 263 insertions(+), 106 deletions(-)
 create mode 100644 arch/x86/include/asm/fsgsbase.h

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2.7.4