From: "Toke Høiland-Jørgensen" <toke@redhat.com>
To: Daniel Borkmann <daniel@iogearbox.net>,
Luigi Rizzo <rizzo@iet.unipi.it>,
Jean-Philippe Brucker <jean-philippe@linaro.org>
Cc: bpf@vger.kernel.org, kpsingh@chromium.org, will@kernel.org
Subject: Re: arch_prepare_bpf_trampoline() for arm ?
Date: Wed, 24 Feb 2021 22:25:38 +0100 [thread overview]
Message-ID: <87blc92m5p.fsf@toke.dk> (raw)
In-Reply-To: <6af0ab27-48f1-e389-d2f4-41b3c1db4a18@iogearbox.net>
Daniel Borkmann <daniel@iogearbox.net> writes:
> On 2/24/21 8:54 PM, Luigi Rizzo wrote:
>> I prepared a BPF version of kstats[1]
>> https://github.com/luigirizzo/lr-cstats
>> that uses fentry/fexit hooks to monitor the execution time
>> of a kernel function.
>>
>> I hoped to have it working on ARM64 too, but it looks like
>> arch_prepare_bpf_trampoline() only exists for x86.
>>
>> Is there any outstanding patch for this function on ARM64,
>> or any similar function I could look at to implement it myself ?
>
> Not that I'm currently aware of, arm64 support would definitely be great
> to have. From x86 side, the underlying arch dependency was basically on
> text_poke_bp() to patch instructions on a live kernel. Haven't checked
> recently whether an equivalent exists on arm64 yet, but perhaps Will
> might know.
Adding Jean-Philippe; I believe he is/was working on this...?
-Toke
next prev parent reply other threads:[~2021-02-24 21:27 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-24 19:54 arch_prepare_bpf_trampoline() for arm ? Luigi Rizzo
2021-02-24 21:01 ` Daniel Borkmann
2021-02-24 21:25 ` Toke Høiland-Jørgensen [this message]
2021-02-25 7:59 ` Jean-Philippe Brucker
2021-02-24 21:30 ` KP Singh
2021-02-24 22:27 ` Daniel Borkmann
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