[PATCH 00/17] x86, mpx updates for 4.2 (take 5)

[Dave Hansen]

Changes from take 4 / v19:

 * Do not pass a task_struct around when we are
   really just going to operate on current

Changes from take 3 / v18 (all minor):

 * use DECLARE_EVENT_CLASS()/DEFINE_EVENT() for
   the ranged tracepoints to save 10 lines of code.

Changes from take 2 / v17 (all minor):

 * fix a couple of whitespace borkages caught by checkpatch,
   and a spelling error or two.
 * replace printk with pr_info() for boot disable
 * change trace print format for address intervals
 * fix up variable name in tsk_get_xsave_addr() comment
 * remove tsk_get_xsave_field() GPL export
 * fix up Qiaowei's From:

--

Hi x86 maintainers,

There are 4 basic things going on here:
1. Make FPU/xsave code preempt safe and work properly
2. Add trace points to make kernel and app debugging easier
3. Add a boot-time disable for mpx
4. Support 32-bit binaries to run on 64-bit kernels

I've hesitated sending this in the past few weeks as
the FPU code had a lot of churn and affected our
ability to test on current kernels.  It seems to have
settled down and appears more stable now.

As mentioned in the tsk_get_xsave_addr() patches, this must
be applied after Oleg's fixes which currently ends with:

	commit 7fc253e27 ("x86/fpu: Kill eager_fpu_init_bp()")

This also sees breakage unless either booted with 'noxsaves'
or if it has Fenghua's set from here applied:

	http://lkml.kernel.org/r/1429678319-61356-1-git-send-email-fenghua.yu@xxxxxxxxx

This set is also available against 4.0-rc4 in git:

  git://git.kernel.org/pub/scm/linux/kernel/git/daveh/x86-mpx.git mpx-v20

Dave Hansen (17):
  x86, fpu: wrap get_xsave_addr() to make it safer
  x86, mpx: use new tsk_get_xsave_addr()
  x86, mpx: trace #BR exceptions
  x86, mpx: trace entry to bounds exception paths
  x86, mpx: trace ranged MPX operations
  x86, mpx: trace allocation of new bounds tables
  x86, mpx: boot-time disable
  x86: make is_64bit_mm() widely available
  x86: make __VIRTUAL_MASK safe to use on 32 bit
  x86, mpx: we do not allocate the bounds directory
  x86, mpx: remove redundant MPX_BNDCFG_ADDR_MASK
  x86, mpx: Add temporary variable to reduce masking
  x86, mpx: new directory entry to addr helper
  x86, mpx: do 32-bit-only cmpxchg for 32-bit apps
  x86, mpx: support 32-bit binaries on 64-bit kernel
  x86, mpx: allow mixed binaries again
  x86, mpx: cleanup: do not pass task around when unnecessary

 Documentation/kernel-parameters.txt |   4 +
 arch/x86/include/asm/mmu_context.h  |  13 ++
 arch/x86/include/asm/mpx.h          |  76 +++++-----
 arch/x86/include/asm/page_types.h   |   8 +
 arch/x86/include/asm/processor.h    |  12 +-
 arch/x86/include/asm/trace/mpx.h    | 121 +++++++++++++++
 arch/x86/include/asm/xsave.h        |   1 +
 arch/x86/kernel/cpu/common.c        |  16 ++
 arch/x86/kernel/traps.c             |  13 +-
 arch/x86/kernel/uprobes.c           |  10 +-
 arch/x86/kernel/xsave.c             |  32 ++++
 arch/x86/mm/mpx.c                   | 283 ++++++++++++++++++++++++++++--------
 kernel/sys.c                        |   8 +-
 13 files changed, 473 insertions(+), 124 deletions(-)
 create mode 100644 arch/x86/include/asm/trace/mpx.h

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