[PATCH v5 0/8] x86: infrastructure to enable FSGSBASE

From: Chang S. Bae
Date: Wed Jun 27 2018 - 13:03:37 EST


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

To facilitate FSGSBASE, Andy's FS/GS base read fix is first
ordered, then some helper functions and refactoring work
are included. Cleanup for the vDSO initialization is
for preparing per-CPU base finder that will be used in the
paranoid entry, when FSGSBASE enabled.

Changes from V4 [5]:
* Change patch ordering; putting the fix first before introducing
the helper functions
* Cleanup further for vDSO CPU initialization codes

Changes from V3 [4]:
* Unify CPU number initialization

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
[5] V4: https://lkml.org/lkml/2018/6/20/1045

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

Chang S. Bae (7):
x86/fsgsbase/64: Introduce FS/GS base helper functions
x86/fsgsbase/64: Make ptrace use FS/GS base helpers
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 helper functions for CPU and node number
x86/vdso: Move out the CPU initialization

arch/x86/entry/vdso/vgetcpu.c | 9 +-
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 | 46 +++++++++-
arch/x86/include/asm/vgtod.h | 26 ------
arch/x86/kernel/cpu/common.c | 24 ++++++
arch/x86/kernel/process_64.c | 183 +++++++++++++++++++++++++++++++---------
arch/x86/kernel/ptrace.c | 28 ++----
9 files changed, 270 insertions(+), 137 deletions(-)
create mode 100644 arch/x86/include/asm/fsgsbase.h

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2.7.4