linux-kernel - [PATCH v2 00/10] x86: Rewrite 64-bit syscall code

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Date:	Thu, 28 Jan 2016 15:11:18 -0800
From:	Andy Lutomirski <luto@...nel.org>
To:	x86@...nel.org
Cc:	linux-kernel@...r.kernel.org, Brian Gerst <brgerst@...il.com>,
	Borislav Petkov <bp@...en8.de>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andy Lutomirski <luto@...nel.org>
Subject: [PATCH v2 00/10] x86: Rewrite 64-bit syscall code

This is kind of like the 32-bit and compat code, except that I
preserved the fast path this time.  I was unable to measure any
significant performance change on my laptop in the fast path.

Changes from v1:
 - Various tidying up.
 - Remove duplicate tables (folded in, so the fastpath table isn't in this set).
 - Rebased to 4.5-rc1
 - Remove enter_from_user_mode stuff -- let's get the basics in first.

Andy Lutomirski (10):
  selftests/x86: Extend Makefile to allow 64-bit-only tests
  selftests/x86: Add check_initial_reg_state
  x86/syscalls: Refactor syscalltbl.sh
  x86/syscalls: Remove __SYSCALL_COMMON and __SYSCALL_X32
  x86/syscalls: Move compat syscall entry handling into syscalltbl.sh
  x86/syscalls: Add syscall entry qualifiers
  x86/entry/64: Always run ptregs-using syscalls on the slow path
  x86/entry/64: Call all native slow-path syscalls with full pt-regs
  x86/entry/64: Stop using int_ret_from_sys_call in ret_from_fork
  x86/entry/64: Migrate the 64-bit syscall slow path to C

 arch/x86/entry/common.c                            |  26 ++
 arch/x86/entry/entry_64.S                          | 271 +++++++--------------
 arch/x86/entry/syscall_32.c                        |  10 +-
 arch/x86/entry/syscall_64.c                        |  13 +-
 arch/x86/entry/syscalls/syscall_64.tbl             |  18 +-
 arch/x86/entry/syscalls/syscalltbl.sh              |  58 ++++-
 arch/x86/kernel/asm-offsets_32.c                   |   2 +-
 arch/x86/kernel/asm-offsets_64.c                   |  10 +-
 arch/x86/um/sys_call_table_32.c                    |   4 +-
 arch/x86/um/sys_call_table_64.c                    |   7 +-
 arch/x86/um/user-offsets.c                         |   6 +-
 tools/testing/selftests/x86/Makefile               |  14 +-
 .../selftests/x86/check_initial_reg_state.c        | 109 +++++++++
 13 files changed, 317 insertions(+), 231 deletions(-)
 create mode 100644 tools/testing/selftests/x86/check_initial_reg_state.c

-- 
2.5.0