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([2a01:4b00:bd21:4f00:7cc6:d3ca:494:116c]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-42cb7f363e4sm34668235f8f.12.2025.11.25.04.46.53 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 25 Nov 2025 04:46:54 -0800 (PST) Message-ID: <58126161-3451-414a-9ee4-83209bcba8fa@gmail.com> Date: Tue, 25 Nov 2025 12:46:52 +0000 Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 07/10] io_uring/bpf: implement struct_ops registration To: Ming Lei Cc: io-uring@vger.kernel.org, axboe@kernel.dk, Martin KaFai Lau , bpf@vger.kernel.org, Alexei Starovoitov , Andrii Nakryiko References: <015ee1ee-e0a4-491f-833f-9cef8c5349cc@gmail.com> Content-Language: en-US From: Pavel Begunkov In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 11/24/25 14:29, Ming Lei wrote: > On Mon, Nov 24, 2025 at 01:12:29PM +0000, Pavel Begunkov wrote: >> On 11/24/25 03:44, Ming Lei wrote: >>> On Thu, Nov 13, 2025 at 11:59:44AM +0000, Pavel Begunkov wrote: ... >>> I feel per-io-uring struct_ops is less useful, because it means the io_uring >>> application has to be capable of loading/registering struct_ops prog, which >>> often needs privilege. >> >> I gave it a thought before, there would need to be a way to pass a >> program from one (e.g. privileged) task to another, e.g. by putting >> it into a list on attachment from where it can be imported. That >> can be extended, and I needed to start somewhere. > > If any task can ask such privileged task to load bpf program for itself, > BPF_UNPRIV_DEFAULT_OFF becomes `N` actually for bpf controlled io_uring. That's not what I said. There are enough apps that can have a privileged component but caps are not extended to e.g. IO workers. >>> For example of IO link use case you mentioned, why does the application need >>> to get privilege for running IO link? >> >> Links are there to compare with existing features. It's more interesting >> to allow arbitrary relations / result propagation between requests. Maybe >> some common patterns can be generalised, but otherwise nothing can be >> done with this without custom tailored bpf programs. > > I know the motivation, which is one thing covered in my IORING_OP_BPF patch > too. -- Pavel Begunkov