linux-kernel - [RFC/PATCH v2 v2 0/6] x86_32: Migrate to new entry/exit paths

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Date:	Thu,  9 Jul 2015 19:17:28 -0700
From:	Andy Lutomirski <luto@...nel.org>
To:	x86@...nel.org, linux-kernel@...r.kernel.org
Cc:	Frédéric Weisbecker <fweisbec@...il.com>,
	Rik van Riel <riel@...hat.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Denys Vlasenko <vda.linux@...glemail.com>,
	Borislav Petkov <bp@...en8.de>,
	Kees Cook <keescook@...omium.org>,
	Brian Gerst <brgerst@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andy Lutomirski <luto@...nel.org>
Subject: [RFC/PATCH v2 v2 0/6] x86_32: Migrate to new entry/exit paths

This is a review version of the 32-bit asm-to-C migration.  I think
it works, but it's not yet well enough tested.  I'm a lot more
familiar with the 64-bit asm than the 32-bit asm.

The vm86 stuff especially needs much more careful testing.  Brian,
since you're playing with vm86 now, can you take a look?

Changes from v1:
 - Fix some nasty vm86 issues.  v1 was a regression.  v2 is an improvement
   over the status quo AFAICT.
 - Add patch 1, which is probably worthwhile on its own.
 - Get rid of the temporary ud2 hack.

Andy Lutomirski (6):
  x86/selftests, x86/vm86: Improve entry_from_vm86 selftest
  x86/entry/32: Remove 32-bit syscall audit optimizations
  x86/entry/32: Fix an incorrect comment for work_notifysig_v86
  x86/entry/32: Remove unnecessary asm check for returns to kernel mode
  x86/entry/32: Migrate to C exit path and rework vm86 exit hack
  x86/entry: Remove do_notify_resume, syscall_trace_leave, and their TIF
    masks

 arch/x86/entry/common.c                       | 107 ++++++++++-----------
 arch/x86/entry/entry_32.S                     | 130 +++----------------------
 arch/x86/include/asm/ptrace.h                 |   1 -
 arch/x86/include/asm/signal.h                 |   1 -
 arch/x86/include/asm/thread_info.h            |  18 +---
 arch/x86/kernel/vm86_32.c                     |   6 +-
 tools/testing/selftests/x86/entry_from_vm86.c | 132 ++++++++++++++++++++++++--
 7 files changed, 191 insertions(+), 204 deletions(-)

-- 
2.4.3

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