There is a 128MB limit on BPF JIT program allocations; this is to ensure BPF programs are in branching range of each other. Patch 1 in this series removes this restriction, but because BPF exception handling used the contiguous nature of the JIT region in fixing up exceptions, changes are needed in exception handling. To verify exception handling still works, a test case to validate exception handling in BPF programs is added in patch 2. There was previous discussion around this topic [1], in particular would be good to get feedback from Daniel if this approach makes sense. [1] https://lore.kernel.org/all/20181121131733.14910-1-ard.biesheuvel@xxxxxxxxxx/ Alan Maguire (1): selftests/bpf: add exception handling selftests for tp_bpf program Russell King (1): arm64/bpf: remove 128MB limit for BPF JIT programs arch/arm64/include/asm/extable.h | 9 ----- arch/arm64/include/asm/memory.h | 5 +-- arch/arm64/kernel/traps.c | 2 +- arch/arm64/mm/extable.c | 13 +++++-- arch/arm64/mm/ptdump.c | 2 - arch/arm64/net/bpf_jit_comp.c | 10 +++-- tools/testing/selftests/bpf/prog_tests/exhandler.c | 45 ++++++++++++++++++++++ tools/testing/selftests/bpf/progs/exhandler_kern.c | 35 +++++++++++++++++ 8 files changed, 97 insertions(+), 24 deletions(-) create mode 100644 tools/testing/selftests/bpf/prog_tests/exhandler.c create mode 100644 tools/testing/selftests/bpf/progs/exhandler_kern.c -- 1.8.3.1
