netdev - [RFC PATCH bpf-next 0/3] arm64 BPF JIT Optimizations

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20200507010504.26352-1-luke.r.nels@gmail.com>
Date:   Wed,  6 May 2020 18:05:00 -0700
From:   Luke Nelson <lukenels@...washington.edu>
To:     bpf@...r.kernel.org
Cc:     Luke Nelson <luke.r.nels@...il.com>, Xi Wang <xi.wang@...il.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Zi Shen Lim <zlim.lnx@...il.com>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Mark Rutland <mark.rutland@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Allison Randal <allison@...utok.net>,
        Ard Biesheuvel <ardb@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        Christoffer Dall <christoffer.dall@...aro.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, clang-built-linux@...glegroups.com
Subject: [RFC PATCH bpf-next 0/3] arm64 BPF JIT Optimizations

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.

Tested on aarch64 QEMU virt machine using test_bpf and test_verifier.

Luke Nelson (3):
  arm64: insn: Fix two bugs in encoding 32-bit logical immediates
  bpf, arm64: Optimize AND,OR,XOR,JSET BPF_K using arm64 logical
    immediates
  bpf, arm64: Optimize ADD,SUB,JMP BPF_K using arm64 add/sub immediates

 arch/arm64/kernel/insn.c      |  6 ++-
 arch/arm64/net/bpf_jit.h      | 22 +++++++++++
 arch/arm64/net/bpf_jit_comp.c | 73 ++++++++++++++++++++++++++++-------
 3 files changed, 85 insertions(+), 16 deletions(-)

Cc: Xi Wang <xi.wang@...il.com>

-- 
2.17.1