[RESEND PATCH V5 0/8] x86: infrastructure to enable FSGSBASE

[Chang S. Bae]

Resending the patchset that was posted before [6].

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://lore.kernel.org/patchwork/cover/912063/
[2] infrastructure for FSGSBASE 
    V1: https://lore.kernel.org/patchwork/cover/913139/
[3] V2: https://lore.kernel.org/patchwork/cover/913644/
[4] V3: https://lore.kernel.org/patchwork/cover/949775/
[5] V4: https://lore.kernel.org/patchwork/cover/951712/
[6] V5: https://lore.kernel.org/patchwork/cover/956526/

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

-- 
2.7.4