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-bg...@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
