[eoan:linux-azure][PULL REQUEST] LP#1877425 - linux-azure: Enable FSGSBASE instructions to support SGX

[Marcelo Henrique Cerri]

BugLink: http://bugs.launchpad.net/bugs/1877425

The following changes since commit 3dd1950d58c5be9d4bd210c45b25f046b7f0add5:

  UBUNTU: Ubuntu-azure-5.3.0-1020.21 (2020-04-08 16:31:44 +0800)

are available in the Git repository at:

  git://git.launchpad.net/~mhcerri/ubuntu/+source/linux/+git/azure azure-5.3-fsgsbase

for you to fetch changes up to f9320c39717ac036d4a011d9fd56340a4705db5a:

  UBUNTU: SAUCE: Documentation/x86/64: Add documentation for GS/FS addressing mode (2020-05-07 15:29:05 -0300)

----------------------------------------------------------------
Andi Kleen (2):
      UBUNTU: SAUCE: x86/fsgsbase/64: Add intrinsics for FSGSBASE instructions
      UBUNTU: SAUCE: x86/elf: Enumerate kernel FSGSBASE capability in AT_HWCAP2

Andy Lutomirski (4):
      UBUNTU: SAUCE: x86/cpu: Add 'unsafe_fsgsbase' to enable CR4.FSGSBASE
      UBUNTU: SAUCE: x86/entry/64: Clean up paranoid exit
      UBUNTU: SAUCE: x86/fsgsbase/64: Use FSGSBASE in switch_to() if available
      UBUNTU: SAUCE: x86/fsgsbase/64: Enable FSGSBASE on 64bit by default and add a chicken bit

Chang S. Bae (9):
      UBUNTU: SAUCE: x86/ptrace: Prevent ptrace from clearing the FS/GS selector
      UBUNTU: SAUCE: selftests/x86/fsgsbase: Test GS selector on ptracer-induced GS base write
      UBUNTU: SAUCE: x86/entry/64: Switch CR3 before SWAPGS in paranoid entry
      UBUNTU: SAUCE: x86/entry/64: Introduce the FIND_PERCPU_BASE macro
      UBUNTU: SAUCE: x86/entry/64: Handle FSGSBASE enabled paranoid entry/exit
      UBUNTU: SAUCE: x86/entry/64: Document GSBASE handling in the paranoid path
      UBUNTU: SAUCE: x86/fsgsbase/64: Enable FSGSBASE instructions in helper functions
      UBUNTU: SAUCE: x86/fsgsbase/64: Use FSGSBASE instructions on thread copy and ptrace
      UBUNTU: SAUCE: selftests/x86/fsgsbase: Test ptracer-induced GS base write with FSGSBASE

Thomas Gleixner (1):
      UBUNTU: SAUCE: Documentation/x86/64: Add documentation for GS/FS addressing mode

Tony Luck (1):
      UBUNTU: SAUCE: x86/speculation/swapgs: Check FSGSBASE in enabling SWAPGS mitigation

 Documentation/admin-guide/kernel-parameters.txt |   2 +
 Documentation/x86/entry_64.rst                  |   9 ++
 Documentation/x86/x86_64/fsgs.rst               | 199 ++++++++++++++++++++++++
 Documentation/x86/x86_64/index.rst              |   1 +
 arch/x86/entry/calling.h                        |  40 +++++
 arch/x86/entry/entry_64.S                       | 134 ++++++++++++----
 arch/x86/include/asm/fsgsbase.h                 |  45 ++++--
 arch/x86/include/asm/inst.h                     |  15 ++
 arch/x86/include/uapi/asm/hwcap2.h              |   3 +
 arch/x86/kernel/cpu/bugs.c                      |   6 +-
 arch/x86/kernel/cpu/common.c                    |  22 +++
 arch/x86/kernel/process_64.c                    | 107 +++++++++++--
 arch/x86/kernel/ptrace.c                        |  14 +-
 tools/testing/selftests/x86/fsgsbase.c          |  24 ++-
 14 files changed, 549 insertions(+), 72 deletions(-)
 create mode 100644 Documentation/x86/x86_64/fsgs.rst

-- 
Regards,
Marcelo

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