[PATCH 00/19] x86, mpx updates for 4.2 (take 6)

Dave Hansen
2015-05-08T18:59:36Z

Changes from take 5 / v20:

* Fix get_xsave_addr() to consult xstate_bv in anticipation
of fixes to xsave code.
* Bug fix for when an VMA being unmapped has neighbors which
are bounds tables.
* Rewrite unmapping code. I didn't do this lightly. It was
not originally my own code, and I resisted changing it
because it worked. But, I started bug chasing and decided
it was unmaintainable. The rewrite ended up removing
about 20% of the unmapping code and made it much simpler.

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 a few 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. Rewrite the unmapping code.
5. Support 32-bit binaries to run on 64-bit kernels

This 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@intel.com

This set is also available against 4.1-rc2 in git:

git://git.kernel.org/pub/scm/linux/kernel/git/daveh/x86-mpx.git mpx-v21

Documentation/kernel-parameters.txt | 4
arch/x86/include/asm/mmu_context.h | 13
arch/x86/include/asm/mpx.h | 76 ++--
arch/x86/include/asm/processor.h | 12
arch/x86/include/asm/xsave.h | 1
arch/x86/kernel/cpu/common.c | 16
arch/x86/kernel/traps.c | 18 -
arch/x86/kernel/uprobes.c | 10
arch/x86/kernel/xsave.c | 73 +++-
arch/x86/mm/mpx.c | 634 +++++++++++++++++++++---------------
kernel/sys.c | 8
11 files changed, 543 insertions(+), 322 deletions(-)