linux-kernel - Re: [PATCH v3 0/5] Support trampoline for LoongArch

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Message-ID: <CAAhV-H5EWp+h0R=YuTivEZEK0diDT+U2u--RPdhtYYr_KB4Z4Q@mail.gmail.com>
Date: Thu, 10 Jul 2025 15:29:03 +0800
From: Huacai Chen <chenhuacai@...nel.org>
To: Chenghao Duan <duanchenghao@...inos.cn>
Cc: ast@...nel.org, daniel@...earbox.net, andrii@...nel.org, 
	yangtiezhu@...ngson.cn, hengqi.chen@...il.com, martin.lau@...ux.dev, 
	eddyz87@...il.com, song@...nel.org, yonghong.song@...ux.dev, 
	john.fastabend@...il.com, kpsingh@...nel.org, sdf@...ichev.me, 
	haoluo@...gle.com, jolsa@...nel.org, kernel@...0n.name, 
	linux-kernel@...r.kernel.org, loongarch@...ts.linux.dev, bpf@...r.kernel.org, 
	guodongtai@...inos.cn, youling.tang@...ux.dev, jianghaoran@...inos.cn
Subject: Re: [PATCH v3 0/5] Support trampoline for LoongArch

Hi, Tiezhu and Hengqi,

Could you please pay some time to review this series? I hope it can be
merged to 6.17.

Huacai

On Wed, Jul 9, 2025 at 1:50 PM Chenghao Duan <duanchenghao@...inos.cn> wrote:
>
> v3:
> 1. Patch 0003 adds EXECMEM_BPF memory type to the execmem subsystem.
>
> 2. Align the size calculated by arch_bpf_trampoline_size to page
> boundaries.
>
> 3. Add the flush icache operation to larch_insn_text_copy.
>
> 4. Unify the implementation of bpf_arch_xxx into the patch
> "0004-LoongArch-BPF-Add-bpf_arch_xxxxx-support-for-Loong.patch".
>
> 5. Change the patch order. Move the patch
> "0002-LoongArch-BPF-Update-the-code-to-rename-validate_.patch" before
> "0005-LoongArch-BPF-Add-bpf-trampoline-support-for-Loon.patch".
>
> -----------------------------------------------------------------------
> Historical Version:
> v2:
> 1. Change the fixmap in the instruction copy function to set_memory_xxx.
>
> 2. Change the implementation method of the following code.
>         - arch_alloc_bpf_trampoline
>         - arch_free_bpf_trampoline
>         Use the BPF core's allocation and free functions.
>
>         - bpf_arch_text_invalidate
>         Operate with the function larch_insn_text_copy that carries
>         memory attribute modifications.
>
> 3. Correct the incorrect code formatting.
>
> URL for version v2:
> https://lore.kernel.org/all/20250618105048.1510560-1-duanchenghao@kylinos.cn/
> ---------
> v1:
> Support trampoline for LoongArch. The following feature tests have been
> completed:
>         1. fentry
>         2. fexit
>         3. fmod_ret
>
> TODO: The support for the struct_ops feature will be provided in
> subsequent patches.
>
> URL for version v1:
> https://lore.kernel.org/all/20250611035952.111182-1-duanchenghao@kylinos.cn/
> -----------------------------------------------------------------------
>
> Chenghao Duan (5):
>   LoongArch: Add the function to generate the beq and bne assembly
>     instructions.
>   LoongArch: BPF: Update the code to rename validate_code to
>     validate_ctx.
>   LoongArch: BPF: Add EXECMEM_BPF memory to execmem subsystem
>   LoongArch: BPF: Add bpf_arch_xxxxx support for Loongarch
>   LoongArch: BPF: Add bpf trampoline support for Loongarch
>
>  arch/loongarch/include/asm/inst.h |   3 +
>  arch/loongarch/kernel/inst.c      |  60 ++++
>  arch/loongarch/mm/init.c          |   6 +
>  arch/loongarch/net/bpf_jit.c      | 491 +++++++++++++++++++++++++++++-
>  arch/loongarch/net/bpf_jit.h      |   6 +
>  5 files changed, 565 insertions(+), 1 deletion(-)
>
> --
> 2.43.0
>
>