linux-kernel - Re: [PATCH bpf-next v2 0/3] arm64 BPF JIT Optimizations

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Date:   Mon, 11 May 2020 13:55:08 +0100
From:   Will Deacon <will@...nel.org>
To:     Luke Nelson <lukenels@...washington.edu>, bpf@...r.kernel.org
Cc:     catalin.marinas@....com, Will Deacon <will@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Christoffer Dall <christoffer.dall@...aro.org>,
        linux-arm-kernel@...ts.infradead.org,
        Andrii Nakryiko <andriin@...com>,
        Zi Shen Lim <zlim.lnx@...il.com>,
        Alexei Starovoitov <ast@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Marc Zyngier <maz@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Luke Nelson <luke.r.nels@...il.com>,
        Song Liu <songliubraving@...com>,
        Martin KaFai Lau <kafai@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        KP Singh <kpsingh@...omium.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Xi Wang <xi.wang@...il.com>,
        Yonghong Song <yhs@...com>, clang-built-linux@...glegroups.com,
        Alexios Zavras <alexios.zavras@...el.com>
Subject: Re: [PATCH bpf-next v2 0/3] arm64 BPF JIT Optimizations

On Fri, 8 May 2020 11:15:43 -0700, Luke Nelson wrote:
> This patch series introduces several optimizations to the arm64 BPF JIT.
> The optimizations make use of arm64 immediate instructions to avoid
> loading BPF immediates to temporary registers, when possible.
> 
> In the process, we discovered two bugs in the logical immediate encoding
> function in arch/arm64/kernel/insn.c using Serval. The series also fixes
> the two bugs before introducing the optimizations.
> 
> [...]

Applied to arm64 (for-next/bpf), thanks!

[1/3] arm64: insn: Fix two bugs in encoding 32-bit logical immediates
      https://git.kernel.org/arm64/c/579d1b3faa37
[2/3] bpf, arm64: Optimize AND,OR,XOR,JSET BPF_K using arm64 logical immediates
      https://git.kernel.org/arm64/c/fd49591cb49b
[3/3] bpf, arm64: Optimize ADD,SUB,JMP BPF_K using arm64 add/sub immediates
      https://git.kernel.org/arm64/c/fd868f148189

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev