This version incorporates feedback from Ingo Molnar and Dave Hansen,
and adds a few test cases that exercise this flow.

v3 updates:
- Split the original patch into 3:
	- function interface changes
	- helper functions
	- functional change to write pkru on sigframe
- Enable all pkeys before XSAVE - i.e. wrpkru(0), rather than assuming
that the alt sig stack is always protected by pkey 0.
- Add a few test cases in pkey_sighandler_tests.c.

I had some trouble adding these tests to
tools/testing/selftests/mm/protection_keys.c, so they're in a separate
file.

Aruna Ramakrishna (4):
  x86/pkeys: Signal handling function interface changes to accept PKRU
    as a parameter
  x86/pkeys: Add helper functions to update PKRU on sigframe
  x86/pkeys: Update PKRU to enable all pkeys before XSAVE
  selftests/mm: Add new testcases for pkeys

 arch/x86/include/asm/fpu/signal.h             |   3 +-
 arch/x86/include/asm/sighandling.h            |  10 +-
 arch/x86/kernel/fpu/signal.c                  |  45 ++-
 arch/x86/kernel/fpu/xstate.c                  |  13 +
 arch/x86/kernel/fpu/xstate.h                  |   1 +
 arch/x86/kernel/signal.c                      |  33 +-
 arch/x86/kernel/signal_32.c                   |   8 +-
 arch/x86/kernel/signal_64.c                   |   9 +-
 tools/testing/selftests/mm/Makefile           |   2 +
 tools/testing/selftests/mm/pkey-helpers.h     |  11 +-
 .../selftests/mm/pkey_sighandler_tests.c      | 315 ++++++++++++++++++
 tools/testing/selftests/mm/protection_keys.c  |  10 -
 12 files changed, 422 insertions(+), 38 deletions(-)
 create mode 100644 tools/testing/selftests/mm/pkey_sighandler_tests.c

-- 
2.39.3