[PATCH 0/9] Add static DEXCR support

[Benjamin Gray]

This series is a partial iteration of the RFC [1]. It strips out the dynamic
support and just adds the supporting infrastructure and static DEXCR
configuration. It should therefore not be introducing any new userspace ABI.

I could keep iterating and refactoring, but I figure there's enough
here to get useful feedback on the design.

[1]: https://lore.kernel.org/all/20221128024458.46121-1-bgray@linux.ibm.com/

Benjamin Gray (9):
  powerpc/book3s: Add missing <linux/sched.h> include
  powerpc/dexcr: Add initial Dynamic Execution Control Register (DEXCR)
    support
  powerpc/dexcr: Handle hashchk exception
  powerpc/dexcr: Support userspace ROP protection
  powerpc/dexcr: Support custom default DEXCR value
  Documentation: Document PowerPC kernel DEXCR interface
  selftests/powerpc: Add more utility macros
  selftests/powerpc/dexcr: Add hashst/hashchk test
  selftests/powerpc/dexcr: Add DEXCR status utility lsdexcr

 Documentation/powerpc/dexcr.rst               |  41 ++++
 Documentation/powerpc/index.rst               |   1 +
 arch/powerpc/Kconfig                          |  14 ++
 arch/powerpc/include/asm/book3s/64/kexec.h    |   5 +
 arch/powerpc/include/asm/book3s/64/kup.h      |   1 +
 arch/powerpc/include/asm/cputable.h           |   4 +-
 arch/powerpc/include/asm/ppc-opcode.h         |   1 +
 arch/powerpc/include/asm/processor.h          |  10 +
 arch/powerpc/include/asm/reg.h                |   7 +
 arch/powerpc/kernel/Makefile                  |   1 +
 arch/powerpc/kernel/cpu_setup_power.c         |   9 +
 arch/powerpc/kernel/dexcr.c                   |  36 +++
 arch/powerpc/kernel/process.c                 |  17 ++
 arch/powerpc/kernel/prom.c                    |   1 +
 arch/powerpc/kernel/traps.c                   |  10 +
 tools/testing/selftests/powerpc/Makefile      |   1 +
 .../selftests/powerpc/dexcr/.gitignore        |   2 +
 .../testing/selftests/powerpc/dexcr/Makefile  |   9 +
 tools/testing/selftests/powerpc/dexcr/dexcr.c | 132 ++++++++++
 tools/testing/selftests/powerpc/dexcr/dexcr.h |  49 ++++
 .../selftests/powerpc/dexcr/hashchk_test.c    | 227 ++++++++++++++++++
 .../testing/selftests/powerpc/dexcr/lsdexcr.c | 141 +++++++++++
 tools/testing/selftests/powerpc/include/reg.h |   4 +
 .../testing/selftests/powerpc/include/utils.h |  31 ++-
 .../powerpc/pmu/sampling_tests/misc.h         |   2 -
 tools/testing/selftests/powerpc/utils.c       |  24 ++
 26 files changed, 776 insertions(+), 4 deletions(-)
 create mode 100644 Documentation/powerpc/dexcr.rst
 create mode 100644 arch/powerpc/kernel/dexcr.c
 create mode 100644 tools/testing/selftests/powerpc/dexcr/.gitignore
 create mode 100644 tools/testing/selftests/powerpc/dexcr/Makefile
 create mode 100644 tools/testing/selftests/powerpc/dexcr/dexcr.c
 create mode 100644 tools/testing/selftests/powerpc/dexcr/dexcr.h
 create mode 100644 tools/testing/selftests/powerpc/dexcr/hashchk_test.c
 create mode 100644 tools/testing/selftests/powerpc/dexcr/lsdexcr.c


base-commit: 065ffaee73892e8a3629b4cfbe635697807a3c6f
--
2.39.2