[PATCH v2 0/3] x86/mm: INVPCID support

[Andy Lutomirski]

Ingo, before applying this, please apply these two KASAN fixes:

http://lkml.kernel.org/g/1452516679-32040-2-git-send-email-aryabinin@xxxxxxxxxxxxx
http://lkml.kernel.org/g/1452516679-32040-3-git-send-email-aryabinin@xxxxxxxxxxxxx

Without those fixes, this series will trigger a KASAN bug.

This is a straightforward speedup on Ivy Bridge and newer, IIRC.
(I tested on Skylake.  INVPCID is not available on Sandy Bridge.
I don't have Ivy Bridge, Haswell or Broadwell to test on, so I
could be wrong as to when the feature was introduced.)

I think we should consider these patches separately from the rest
of the PCID stuff -- they barely interact, and this part is much
simpler and is useful on its own.

This is exactly identical to patches 2-4 of the PCID RFC series.

Andy Lutomirski (3):
  x86/mm: Add INVPCID helpers
  x86/mm: Add a noinvpcid option to turn off INVPCID
  x86/mm: If INVPCID is available, use it to flush global mappings

 Documentation/kernel-parameters.txt |  2 ++
 arch/x86/include/asm/tlbflush.h     | 50 +++++++++++++++++++++++++++++++++++++
 arch/x86/kernel/cpu/common.c        | 16 ++++++++++++
 3 files changed, 68 insertions(+)

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2.5.0