[PATCH v4 0/5] x86/pkeys: update PKRU to enable pkey 0 before

[Aruna Ramakrishna <aruna.ramakrishna@oracle.com>]

v4 updates (based on review feedback from Thomas Gleixner):
- Simplified update_pkru_in_sigframe()
- Changed sigpkru to enable minimally required keys (init_pkru and current
  pkru)
- Modified pkey_sighandler_tests.c to use kselfttest framework
- Fixed commit descriptions
- Fixed sigreturn use case (pointed out by Jeff Xu)
- Added a new sigreturn test case

v3 updates (based on review feedback from Ingo Molnar and Dave Hansen):
- Split the original patch into 3:
        - function interface changes
        - helper functions
        - functional change to write pkru on sigframe
- Enabled all pkeys before XSAVE - i.e. wrpkru(0), rather than assuming
that the alt sig stack is always protected by pkey 0.
- Added 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: Add PKRU as a parameter in signal handling functions
  x86/pkeys: Add helper functions to update PKRU on sigframe
  x86/pkeys: Update PKRU to enable minimally required pkeys before XSAVE
  x86/pkeys: Restore altstack before sigcontext

Keith Lucas (1):
  selftests/mm: Add new testcases for pkeys

 arch/x86/include/asm/fpu/signal.h             |   2 +-
 arch/x86/include/asm/sighandling.h            |  10 +-
 arch/x86/kernel/fpu/signal.c                  |  27 +-
 arch/x86/kernel/fpu/xstate.c                  |  13 +
 arch/x86/kernel/fpu/xstate.h                  |   1 +
 arch/x86/kernel/signal.c                      |  42 +-
 arch/x86/kernel/signal_32.c                   |  12 +-
 arch/x86/kernel/signal_64.c                   |  14 +-
 tools/testing/selftests/mm/Makefile           |   5 +-
 tools/testing/selftests/mm/pkey-helpers.h     |  11 +-
 .../selftests/mm/pkey_sighandler_tests.c      | 480 ++++++++++++++++++
 tools/testing/selftests/mm/protection_keys.c  |  10 -
 12 files changed, 582 insertions(+), 45 deletions(-)
 create mode 100644 tools/testing/selftests/mm/pkey_sighandler_tests.c


base-commit: a38297e3fb012ddfa7ce0321a7e5a8daeb1872b6
prerequisite-patch-id: d84439301b44c03df2555d3722ec512001ae52f2
-- 
2.39.3