Messages in this thread | | | Date | Thu, 16 Feb 2023 09:23:02 +0800 | Subject | Re: [PATCH bpf-next v1 0/4] Support bpf trampoline for RV64 | From | Pu Lehui <> |
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On 2023/2/15 22:45, Björn Töpel wrote: > Hi Lehui, > > Pu Lehui <pulehui@huaweicloud.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. Since RV64 does not support ftrace >> direct call yet, the current RV64 bpf trampoline is only >> used in bpf context. > > Thanks a lot for continuing this work. I agree with you that it's > valuable to have BPF trampoline support, even without proper direct call > support (we'll get there soon). The trampoline enables kfunc calls. On > that note; I don't see that you enable "bpf_jit_supports_kfunc_call()" > anywhere in the series. With BPF trampoline support, the RISC-V BPF > finally can support kfunc calls! > > I'd add the following to bpf_jit_comp64.c: >
happy to hear that,let's make it more completeable.
> bool bpf_jit_supports_kfunc_call(void) > { > return true; > } > > :-) > > I'll do a review ASAP. > > > Björn
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