[PATCH v2 0/4] support FEAT_MTE_STORE_ONLY feature

[Yeoreum Yun]

The FEAT_MTE_STORE_ONLY feature provides support for
tag check for store operation only. read operation is considered
as unchecked operation so it doesn't raise tag check fault.

NOTE:
  This patches based on https://lore.kernel.org/linux-arm-kernel/20250403172758.67106-1-yeoreum.yun@xxxxxxx/

Since v1:
  - add doc to elf_hwcaps.rst
  - add MTE_STORE_ONLY hwcap test

Yeoreum Yun (4):
  arm64/feature: add MTE_STORE_ONLY feature
  prtcl: introduce PR_MTE_STORE_ONLY
  arm64/kernel: support store-only mte tag check
  tools/kselftest: add MTE_STORE_ONLY feature hwcap test

 Documentation/arch/arm64/elf_hwcaps.rst   |  3 +++
 arch/arm64/include/asm/hwcap.h            |  1 +
 arch/arm64/include/asm/processor.h        |  2 ++
 arch/arm64/include/uapi/asm/hwcap.h       |  1 +
 arch/arm64/kernel/cpufeature.c            |  9 +++++++++
 arch/arm64/kernel/cpuinfo.c               |  1 +
 arch/arm64/kernel/mte.c                   | 11 ++++++++++-
 arch/arm64/kernel/process.c               |  6 +++++-
 arch/arm64/tools/cpucaps                  |  1 +
 include/uapi/linux/prctl.h                |  2 ++
 tools/testing/selftests/arm64/abi/hwcap.c |  6 ++++++
 11 files changed, 41 insertions(+), 2 deletions(-)

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