linux-kernel - [PATCH bpf-next 0/4] RV64 BPF JIT Optimizations

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Date:   Tue,  5 May 2020 17:03:16 -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>,
        Björn Töpel <bjorn.topel@...il.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        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>, netdev@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH bpf-next 0/4] RV64 BPF JIT Optimizations

This patch series introduces a set of optimizations to the BPF JIT
on RV64. The optimizations are related to the verifier zero-extension
optimization and BPF_JMP BPF_K.

We tested the optimizations on a QEMU riscv64 virt machine, using
lib/test_bpf and test_verifier, and formally verified their correctness
using Serval.

Luke Nelson (4):
  bpf, riscv: Enable missing verifier_zext optimizations on RV64
  bpf, riscv: Optimize FROM_LE using verifier_zext on RV64
  bpf, riscv: Optimize BPF_JMP BPF_K when imm == 0 on RV64
  bpf, riscv: Optimize BPF_JSET BPF_K using andi on RV64

 arch/riscv/net/bpf_jit_comp64.c | 64 ++++++++++++++++++++++-----------
 1 file changed, 44 insertions(+), 20 deletions(-)

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

-- 
2.17.1