[PATCH bpf-next v2 0/9] Add arena argument support to kfuncs and struct_ops

[Kumar Kartikeya Dwivedi <memxor@gmail.com>]

This is a continuation of patches in [0], with mostly minor changes and
reordering. The motivation is covered in that link. A major change is
moving to two tags (__arena and __arena_nullable) and moving the changes
to JIT to emit more optimized sequences.

Please see commit logs for details.

  [0]: https://lore.kernel.org/bpf/20260713024414.3759854-1-tj@kernel.org

Changelog:
----------
v1 -> v2
v1: https://lore.kernel.org/bpf/20260715220052.1590783-1-memxor@gmail.com

 * Fix documentation to only mention x86 for now. (Sashiko)
 * Move arg bitmap from insn_aux_data to kfunc descriptor. (Eduard)

Tejun Heo (9):
  bpf: Support __arena and __arena_nullable kfunc argument suffixes
  bpf: Support __arena and __arena_nullable on struct_ops arguments
  bpf, x86: JIT __arena kfunc argument rebasing
  bpf, x86: Convert struct_ops arena arguments in the trampoline
  selftests/bpf: Add kfunc __arena and __arena_nullable argument tests
  selftests/bpf: Add JIT-sequence tests for __arena kfunc arguments
  selftests/bpf: Add struct_ops __arena and __arena_nullable argument
    tests
  bpf, x86: Fix stack-passed arguments for indirect trampolines
  selftests/bpf: Test stack-passed struct_ops arena arguments

 Documentation/bpf/kfuncs.rst                  |  39 +++
 arch/x86/net/bpf_jit_comp.c                   | 129 ++++++++-
 include/linux/bpf.h                           |  25 ++
 include/linux/filter.h                        |   1 +
 kernel/bpf/bpf_struct_ops.c                   |  34 ++-
 kernel/bpf/btf.c                              |  28 +-
 kernel/bpf/core.c                             |   5 +
 kernel/bpf/trampoline.c                       |  64 +++++
 kernel/bpf/verifier.c                         |  62 ++++-
 .../selftests/bpf/prog_tests/arena_kfunc.c    |  15 +
 .../bpf/prog_tests/arena_kfunc_jit.c          |  13 +
 .../bpf/prog_tests/test_struct_ops_arena.c    |  74 +++++
 .../testing/selftests/bpf/progs/arena_kfunc.c | 260 ++++++++++++++++++
 .../selftests/bpf/progs/arena_kfunc_jit.c     |  96 +++++++
 .../selftests/bpf/progs/struct_ops_arena.c    | 115 ++++++++
 .../bpf/progs/struct_ops_arena_fail.c         |  20 ++
 .../selftests/bpf/test_kmods/bpf_testmod.c    |  95 +++++++
 .../selftests/bpf/test_kmods/bpf_testmod.h    |   6 +
 .../bpf/test_kmods/bpf_testmod_kfunc.h        |  13 +
 19 files changed, 1062 insertions(+), 32 deletions(-)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/arena_kfunc.c
 create mode 100644 tools/testing/selftests/bpf/prog_tests/arena_kfunc_jit.c
 create mode 100644 tools/testing/selftests/bpf/prog_tests/test_struct_ops_arena.c
 create mode 100644 tools/testing/selftests/bpf/progs/arena_kfunc.c
 create mode 100644 tools/testing/selftests/bpf/progs/arena_kfunc_jit.c
 create mode 100644 tools/testing/selftests/bpf/progs/struct_ops_arena.c
 create mode 100644 tools/testing/selftests/bpf/progs/struct_ops_arena_fail.c


base-commit: 4748a67f711188cbd64bc72c3df636f627858ed0
-- 
2.53.0