linux-kernel - Re: [PATCH v4 bpf-next 2/5] bpf: assign ID to vmlinux BTF and return extra info for BTF in GET_OBJ

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Message-ID: <AD242C68-00CA-4775-896F-257A11872164@fb.com>
Date:   Tue, 10 Nov 2020 20:24:32 +0000
From:   Song Liu <songliubraving@...com>
To:     Andrii Nakryiko <andrii@...nel.org>
CC:     bpf <bpf@...r.kernel.org>, Networking <netdev@...r.kernel.org>,
        "Alexei Starovoitov" <ast@...com>,
        "daniel@...earbox.net" <daniel@...earbox.net>,
        Kernel Team <Kernel-team@...com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "rafael@...nel.org" <rafael@...nel.org>,
        "jeyu@...nel.org" <jeyu@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH v4 bpf-next 2/5] bpf: assign ID to vmlinux BTF and return
 extra info for BTF in GET_OBJ_INFO



> On Nov 9, 2020, at 5:19 PM, Andrii Nakryiko <andrii@...nel.org> wrote:
> 
> Allocate ID for vmlinux BTF. This makes it visible when iterating over all BTF
> objects in the system. To allow distinguishing vmlinux BTF (and later kernel
> module BTF) from user-provided BTFs, expose extra kernel_btf flag, as well as
> BTF name ("vmlinux" for vmlinux BTF, will equal to module's name for module
> BTF).  We might want to later allow specifying BTF name for user-provided BTFs
> as well, if that makes sense. But currently this is reserved only for
> in-kernel BTFs.
> 
> Having in-kernel BTFs exposed IDs will allow to extend BPF APIs that require
> in-kernel BTF type with ability to specify BTF types from kernel modules, not
> just vmlinux BTF. This will be implemented in a follow up patch set for
> fentry/fexit/fmod_ret/lsm/etc.
> 
> Signed-off-by: Andrii Nakryiko <andrii@...nel.org>

Acked-by: Song Liu <songliubraving@...com>