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    SubjectRe: [PATCH bpf-next v2 5/6] bpf, arm64: bpf trampoline for arm64
    On Thu, Apr 14, 2022 at 9:10 AM Xu Kuohai <xukuohai@huawei.com> wrote:
    >
    > Add bpf trampoline support for arm64. Most of the logic is the same as
    > x86.
    >
    > fentry before bpf trampoline hooked:
    > mov x9, x30
    > nop
    >
    > fentry after bpf trampoline hooked:
    > mov x9, x30
    > bl <bpf_trampoline>
    >
    > Tested on qemu, result:
    > #55 fentry_fexit:OK
    > #56 fentry_test:OK
    > #58 fexit_sleep:OK
    > #59 fexit_stress:OK
    > #60 fexit_test:OK
    > #67 get_func_args_test:OK
    > #68 get_func_ip_test:OK
    > #101 modify_return:OK
    >
    > Signed-off-by: Xu Kuohai <xukuohai@huawei.com>
    > Acked-by: Song Liu <songliubraving@fb.com>
    > ---

    Can you please also take a look at [0], which is an ongoing work to
    add support for BPF cookie to BPF trampoline-based BPF programs. It's
    very close to being done, so it would be good if you can implement
    that at the same time.

    [0] https://patchwork.kernel.org/project/netdevbpf/patch/20220412165555.4146407-4-kuifeng@fb.com/

    > arch/arm64/net/bpf_jit.h | 14 +-
    > arch/arm64/net/bpf_jit_comp.c | 338 +++++++++++++++++++++++++++++++++-
    > 2 files changed, 348 insertions(+), 4 deletions(-)
    >

    [...]

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