[PATCH v3 0/4] selftests/arm64: Fix MTE test setup and TAP reporting

[Muhammad Usama Anjum <usama.anjum@arm.com>]

Running the mainline arm64 MTE selftests on a Pixel 8 exposed three
independent reporting problems. Fix these reporting problems, then add
an arm64 Kconfig fragment covering the facilities used by the MTE tests.

Testing was performed on a Pixel 8 with an Android 6.1 kernel built with
the new configuration. All nine static MTE binaries returned success.

Changes since v2:
- Combine the MTE TAP header fixes into a single patch.
- Treat inaccessible KSM merge_across_nodes as a skipped prerequisite.

Changes since v1:
- Add missing MTE TAP headers as an output-only cleanup and clarify why
  line buffering prevents duplicate GCR_EL1 plan output.
- Validate KSM privileges and optional sysfs access before setup.
- Move and expand the arm64 config fragment, and standardize subjects on
  the selftests/arm64 prefix.

Muhammad Usama Anjum (4):
  selftests/arm64: Print missing MTE TAP headers
  selftests/arm64: Treat KSM merge_across_nodes as optional
  selftests/arm64: Fix MTE prctl TAP plan
  selftests/arm64: Add MTE test config fragment

 tools/testing/selftests/arm64/config          | 17 ++++++++++
 .../selftests/arm64/mte/check_buffer_fill.c   |  2 ++
 .../selftests/arm64/mte/check_child_memory.c  |  2 ++
 .../arm64/mte/check_gcr_el1_cswitch.c         |  1 +
 .../arm64/mte/check_hugetlb_options.c         |  2 ++
 .../selftests/arm64/mte/check_ksm_options.c   | 31 +++++++++++++++++--
 .../selftests/arm64/mte/check_mmap_options.c  |  2 ++
 .../testing/selftests/arm64/mte/check_prctl.c |  2 +-
 .../arm64/mte/check_tags_inclusion.c          |  2 ++
 .../selftests/arm64/mte/check_user_mem.c      |  2 ++
 10 files changed, 59 insertions(+), 4 deletions(-)
 create mode 100644 tools/testing/selftests/arm64/config

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2.47.3