linux-kernel - Re: [PATCH bpf-next 2/2] bpf: Make BPF_JIT_DEFAULT

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Message-ID: <af2b415a-874d-0524-c5bb-b50c419a1559@iogearbox.net>
Date:   Fri, 11 Feb 2022 11:23:59 +0100
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Tiezhu Yang <yangtiezhu@...ngson.cn>,
        Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>
Cc:     Xuefeng Li <lixuefeng@...ngson.cn>, netdev@...r.kernel.org,
        bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH bpf-next 2/2] bpf: Make BPF_JIT_DEFAULT_ON selectable in
 Kconfig

On 2/11/22 9:57 AM, Tiezhu Yang wrote:
> Currently, it is not possible to set bpf_jit_enable to 1 by default
> and the users can change it to 0 or 2, it seems bad for some users,
> make BPF_JIT_DEFAULT_ON selectable to give them a chance.

I'm not fully sure I follow the above, so you are saying that a kconfig of
!BPF_JIT_ALWAYS_ON and ARCH_WANT_DEFAULT_BPF_JIT, enables BPF_JIT_DEFAULT_ON
however in such setting you are not able to reset bpf_jit_enable back to 0 at
runtime?

Thanks,
Daniel