> On 29 Aug 2025, at 10:21 PM, Saket Kumar Bhaskar <skb99@linux.ibm.com> wrote:
>
> 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.
>
> 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
>
> Changes since v1:
>
> Addressed comments from Chris:
> * Squashed introduction of bpf_jit_emit_probe_mem_store() and its usage in
> one patch.
> * Defined and used PPC_RAW_RLDICL_DOT to avoid the CMPDI.
> * Removed conditional statement for fixup[0] = PPC_RAW_LI(dst_reg, 0);
> * Indicated this change is limited to powerpc64 in subject.
>
> Addressed comments from Alexei:
> * Removed skel->rodata->nr_cpus = get_nprocs() and its usage to get
> currently online cpus(as it needs to be updated from userspace).
>
> Saket Kumar Bhaskar (5):
> powerpc64/bpf: Implement PROBE_MEM32 pseudo instructions
> powerpc64/bpf: Implement bpf_addr_space_cast instruction
> powerpc64/bpf: Introduce bpf_jit_emit_atomic_ops() to emit atomic
> instructions
> powerpc64/bpf: Implement PROBE_ATOMIC instructions
> selftests/bpf: Fix arena_spin_lock selftest failure
>
> arch/powerpc/include/asm/ppc-opcode.h | 1 +
> 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 | 401 +++++++++++++-----
> .../bpf/prog_tests/arena_spin_lock.c | 13 +
> .../selftests/bpf/progs/arena_spin_lock.c | 5 +-
> 7 files changed, 347 insertions(+), 113 deletions(-)
>
> --
> 2.43.5
>
Tested this patch set by applying on top of bpd-next repo and it works as expected. Hence, please add below tag for the series.
Tested-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>
Regards,
Venkat.