linux-kernel - Re: [RFC PATCH RESEND bpf-next 0/4] Support bpf trampoline for RV64

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Date:   Sat, 24 Dec 2022 14:22:57 +0800
From:   Pu Lehui <pulehui@...weicloud.com>
To:     Björn Töpel <bjorn@...nel.org>,
        bpf@...r.kernel.org, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Cc:     Luke Nelson <luke.r.nels@...il.com>, Xi Wang <xi.wang@...il.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Pu Lehui <pulehui@...wei.com>
Subject: Re: [RFC PATCH RESEND bpf-next 0/4] Support bpf trampoline for RV64



On 2022/12/22 21:00, Björn Töpel wrote:
> Pu Lehui <pulehui@...weicloud.com> writes:
> 
>> BPF trampoline is the critical infrastructure of the bpf
>> subsystem, acting as a mediator between kernel functions
>> and BPF programs. Numerous important features, such as
>> using ebpf program for zero overhead kernel introspection,
>> rely on this key component. We can't wait to support bpf
>> trampoline on RV64. The implementation of bpf trampoline
>> was closely to x86 and arm64 for future development.
> 
> Thank you for working on this! BPF trampoline is the "missing piece"
> from getting proper kfunc support.
> 
> Unfortunately, I wont be able to do a proper review until next week.
> 

Take your time, it might take several rounds of optimization. Yep, riscv 
bpf will look more complete when bpf trampoline and kfunc are supported.

Anyway, have a nice christmas holidays.😄

Lehui

> 
> Happy holidays,
> Björn