netdev - Re: [PATCH bpf-next v2 5/6] bpf, arm64: bpf trampoline for arm64

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Date:   Fri, 15 Apr 2022 10:12:31 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Xu Kuohai <xukuohai@...wei.com>
Cc:     bpf <bpf@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Zi Shen Lim <zlim.lnx@...il.com>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        David Ahern <dsahern@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        X86 ML <x86@...nel.org>, hpa@...or.com,
        Shuah Khan <shuah@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Pasha Tatashin <pasha.tatashin@...een.com>,
        Peter Collingbourne <pcc@...gle.com>,
        Daniel Kiss <daniel.kiss@....com>,
        Sudeep Holla <sudeep.holla@....com>,
        Steven Price <steven.price@....com>,
        Marc Zyngier <maz@...nel.org>, Mark Brown <broonie@...nel.org>,
        Kumar Kartikeya Dwivedi <memxor@...il.com>,
        Delyan Kratunov <delyank@...com>
Subject: Re: [PATCH bpf-next v2 5/6] bpf, arm64: bpf trampoline for arm64

On Thu, Apr 14, 2022 at 9:10 AM Xu Kuohai <xukuohai@...wei.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@...wei.com>
> Acked-by: Song Liu <songliubraving@...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(-)
>

[...]