linux-kernel - Re: [PATCH bpf v2] riscv, bpf: Emit fixed-length instructions for BPF_PSEUDO

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Message-ID: <db4c483d-d798-fcfa-1791-856f61decfd7@huawei.com>
Date:   Tue, 6 Dec 2022 16:49:41 +0800
From:   Pu Lehui <pulehui@...wei.com>
To:     Björn Töpel <bjorn@...nel.org>,
        Pu Lehui <pulehui@...weicloud.com>, <bpf@...r.kernel.org>,
        <linux-riscv@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
CC:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>
Subject: Re: [PATCH bpf v2] riscv, bpf: Emit fixed-length instructions for
 BPF_PSEUDO_FUNC



On 2022/12/6 16:42, Björn Töpel wrote:
> Pu Lehui <pulehui@...weicloud.com> writes:
> 
>>> Wouldn't that work?
>>>
>>
>> It definitely works. But auipc+addi may be some holes, while
>> lui+addi+slli support all the address of kernel and module. And this
>> might be help for the future feature porting.
> 
> We're already using auipc/jalr for calls, and I'd say it *very* unlikely
> that we'll hit the non-covered range. I'd say go with auipc/addi +
> error, and we can change if this really is a problem.

Well, thank you for your patience, will send new soon.