linux-kernel - Re: [PATCH bpf-next v2 1/3] btf: allow mmap of vmlinux btf

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Message-ID: <CAN+4W8i0CB+gYcBNyWUxAA+=89Q+nMFopxKUF3nt1+y5ATaNyg@mail.gmail.com>
Date: Fri, 2 May 2025 17:53:24 +0100
From: Lorenz Bauer <lmb@...valent.com>
To: Arnd Bergmann <arnd@...db.de>, 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@...ichev.me>, Hao Luo <haoluo@...gle.com>, 
	Jiri Olsa <jolsa@...nel.org>, Mykola Lysenko <mykolal@...com>, Shuah Khan <shuah@...nel.org>
Cc: linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org, 
	bpf@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH bpf-next v2 1/3] btf: allow mmap of vmlinux btf

On Fri, May 2, 2025 at 11:20 AM Lorenz Bauer <lmb@...valent.com> wrote:
>
> User space needs access to kernel BTF for many modern features of BPF.
> Right now each process needs to read the BTF blob either in pieces or
> as a whole. Allow mmaping the sysfs file so that processes can directly
> access the memory allocated for it in the kernel.

I just realised that there is also code which exposes module BTF via
sysfs, which my code currently doesn't handle. I'll send a v3.