linux-kernel - Re: [PATCH bpf-next v2 2/2] bpf,riscv: Implement bpf_addr_space

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Message-ID: <878r263vg3.fsf@all.your.base.are.belong.to.us>
Date: Mon, 25 Mar 2024 21:31:08 +0100
From: Björn Töpel <bjorn@...nel.org>
To: Puranjay Mohan <puranjay12@...il.com>, Conor Dooley <conor@...nel.org>
Cc: Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann
 <daniel@...earbox.net>, Andrii Nakryiko <andrii@...nel.org>, Martin KaFai
 Lau <martin.lau@...ux.dev>, Eduard Zingerman <eddyz87@...il.com>, Song Liu
 <song@...nel.org>, Yonghong Song <yonghong.song@...ux.dev>, 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>, Luke Nelson <luke.r.nels@...il.com>, Xi Wang
 <xi.wang@...il.com>, Paul Walmsley <paul.walmsley@...ive.com>, Palmer
 Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>,
 bpf@...r.kernel.org, linux-riscv@...ts.infradead.org,
 linux-kernel@...r.kernel.org, Pu Lehui <pulehui@...weicloud.com>, Manu
 Bretelle <chantra@...a.com>, Mykola Lysenko <mykolal@...a.com>, Nikolay
 Yurin <yurinnick@...a.com>
Subject: Re: [PATCH bpf-next v2 2/2] bpf,riscv: Implement
 bpf_addr_space_cast instruction

Puranjay Mohan <puranjay12@...il.com> writes:

> Is there a separate CI for RISCV related stuff? is it public?
>
> I would be interested in adding RISC-V support in
> https://github.com/kernel-patches/bpf
> Is someone already working on this?

+Cc Manu/Mykola/Nico who's doing all of the awesome BPF CI work at Meta,
and can keep me honest. ;-)

I did some early hacks for to add RISC-V support for the BPF CI, but
haven't had time to work on it recently. :-(

  [1] https://github.com/libbpf/ci/pull/87
  [2] https://github.com/kernel-patches/vmtest/pull/194

I've been talking recently to Lehui about it as well.

Two major things are missing:

1. Cross-compilation support (expand on [1])
2. Align the rootfs with what the other arch are using, to run the tests
   on Qemu/TCG (and proper HW at some point!). RISC-V does not have
   Debian Stable support, and would probably need Ubuntu or Debian Sid
   snapshop. Manu outlines some issues here:
   https://github.com/libbpf/ci/pull/83

Having to manually run BPF tests ("non-official RISC-V BPF CI") is a
mess!


Björn