Changes in V2 V1: https://lore.kernel.org/bpf/20240314150003.123020-1-puranjay12@xxxxxxxxx/ - Fix build warnings by using 5 in place of 32 as DONT_CLEAR marker. R5 is not mapped to any BPF register so it can safely be used here. This series adds the support for PROBE_MEM32 and bpf_addr_space_cast instructions to the ARM64 BPF JIT. These two instructions allow the enablement of BPF Arena. All arena related selftests are passing. [root@ip-172-31-6-62 bpf]# ./test_progs -a "*arena*" #3/1 arena_htab/arena_htab_llvm:OK #3/2 arena_htab/arena_htab_asm:OK #3 arena_htab:OK #4/1 arena_list/arena_list_1:OK #4/2 arena_list/arena_list_1000:OK #4 arena_list:OK #434/1 verifier_arena/basic_alloc1:OK #434/2 verifier_arena/basic_alloc2:OK #434/3 verifier_arena/basic_alloc3:OK #434/4 verifier_arena/iter_maps1:OK #434/5 verifier_arena/iter_maps2:OK #434/6 verifier_arena/iter_maps3:OK #434 verifier_arena:OK Summary: 3/10 PASSED, 0 SKIPPED, 0 FAILED The implementation of bpf_addr_space_cast can be optimised by using ROR (immediate) and CSEL instructions. Currently, lib/insn.c doesn't have APIs to generate these intructions. I will send subsequent patches to implement the APIs and then use these instructions in the JIT. Puranjay Mohan (2): bpf: Add arm64 JIT support for PROBE_MEM32 pseudo instructions. bpf: Add arm64 JIT support for bpf_addr_space_cast instruction. arch/arm64/net/bpf_jit.h | 1 + arch/arm64/net/bpf_jit_comp.c | 105 +++++++++++++++++-- tools/testing/selftests/bpf/DENYLIST.aarch64 | 2 - 3 files changed, 96 insertions(+), 12 deletions(-) -- 2.40.1
