[bpf-next 0/6] bpf,powerpc: Add support for bpf arena and arena atomics

[Saket Kumar Bhaskar <skb99@linux.ibm.com>]

This patch series introduces support for the PROBE_MEM32,
bpf_addr_space_cast and PROBE_ATOMIC instructions in the powerpc BPF JIT,
facilitating the implementation of BPF arena and arena atomics.

The last patch in the series has fix for arena spinlock selftest
failure.

This series is rebased on top of:
https://lore.kernel.org/bpf/20250717202935.29018-2-puranjay@kernel.org/

All selftests related to bpf_arena, bpf_arena_atomic(except
load_acquire/store_release) enablement are passing:

# ./test_progs -t arena_list
#5/1     arena_list/arena_list_1:OK
#5/2     arena_list/arena_list_1000:OK
#5       arena_list:OK
Summary: 1/2 PASSED, 0 SKIPPED, 0 FAILED

# ./test_progs -t arena_htab
#4/1     arena_htab/arena_htab_llvm:OK
#4/2     arena_htab/arena_htab_asm:OK
#4       arena_htab:OK
Summary: 1/2 PASSED, 0 SKIPPED, 0 FAILED

# ./test_progs -t verifier_arena
#464/1   verifier_arena/basic_alloc1:OK
#464/2   verifier_arena/basic_alloc2:OK
#464/3   verifier_arena/basic_alloc3:OK
#464/4   verifier_arena/iter_maps1:OK
#464/5   verifier_arena/iter_maps2:OK
#464/6   verifier_arena/iter_maps3:OK
#464     verifier_arena:OK
#465/1   verifier_arena_large/big_alloc1:OK
#465/2   verifier_arena_large/big_alloc2:OK
#465     verifier_arena_large:OK
Summary: 2/8 PASSED, 0 SKIPPED, 0 FAILED

# ./test_progs -t arena_atomics
#3/1     arena_atomics/add:OK
#3/2     arena_atomics/sub:OK
#3/3     arena_atomics/and:OK
#3/4     arena_atomics/or:OK
#3/5     arena_atomics/xor:OK
#3/6     arena_atomics/cmpxchg:OK
#3/7     arena_atomics/xchg:OK
#3/8     arena_atomics/uaf:OK
#3/9     arena_atomics/load_acquire:SKIP
#3/10    arena_atomics/store_release:SKIP
#3       arena_atomics:OK (SKIP: 2/10)
Summary: 1/8 PASSED, 2 SKIPPED, 0 FAILED

All selftests related to arena_spin_lock are passing:

# ./test_progs -t arena_spin_lock
#6/1     arena_spin_lock/arena_spin_lock_1:OK
#6/2     arena_spin_lock/arena_spin_lock_1000:OK
#6/3     arena_spin_lock/arena_spin_lock_50000:OK
#6       arena_spin_lock:OK
Summary: 1/3 PASSED, 0 SKIPPED, 0 FAILED

Saket Kumar Bhaskar (6):
  bpf,powerpc: Introduce bpf_jit_emit_probe_mem_store() to emit store
    instructions
  bpf,powerpc: Implement PROBE_MEM32 pseudo instructions
  bpf,powerpc: Implement bpf_addr_space_cast instruction
  bpf,powerpc: Introduce bpf_jit_emit_atomic_ops() to emit atomic
    instructions
  bpf,powerpc: Implement PROBE_ATOMIC instructions
  selftests/bpf: Fix arena_spin_lock selftest failure

 arch/powerpc/net/bpf_jit.h                    |   6 +-
 arch/powerpc/net/bpf_jit_comp.c               |  32 +-
 arch/powerpc/net/bpf_jit_comp32.c             |   2 +-
 arch/powerpc/net/bpf_jit_comp64.c             | 378 +++++++++++++-----
 .../bpf/prog_tests/arena_spin_lock.c          |  23 +-
 .../selftests/bpf/progs/arena_spin_lock.c     |   8 +-
 .../selftests/bpf/progs/bpf_arena_spin_lock.h |   4 +-
 7 files changed, 348 insertions(+), 105 deletions(-)

base-commit: ea2aecdf7a954a8c0015e185cc870c4191d1d93f
-- 
2.43.5