From: Luke Nelson <lukenels@cs.washington.edu>
To: bpf@vger.kernel.org
Cc: Luke Nelson <luke.r.nels@gmail.com>,
Shubham Bansal <illusionist.neo@gmail.com>,
Russell King <linux@armlinux.org.uk>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
Yonghong Song <yhs@fb.com>, Andrii Nakryiko <andriin@fb.com>,
John Fastabend <john.fastabend@gmail.com>,
KP Singh <kpsingh@chromium.org>,
netdev@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: [PATCH bpf 0/2] bpf, arm: Small JIT optimizations
Date: Thu, 30 Apr 2020 19:02:08 -0700 [thread overview]
Message-ID: <20200501020210.32294-1-luke.r.nels@gmail.com> (raw)
As Daniel suggested to us, we ran our formal verification tool, Serval,
over the arm JIT. The bugs we found have been patched and applied to the
bpf tree [1, 2]. This patch series introduces two small optimizations
that simplify the JIT and use fewer instructions.
[1] https://lore.kernel.org/bpf/20200408181229.10909-1-luke.r.nels@gmail.com/
[2] https://lore.kernel.org/bpf/20200409221752.28448-1-luke.r.nels@gmail.com/
Luke Nelson (2):
bpf, arm: Optimize emit_a32_arsh_r64 using conditional instruction
bpf, arm: Optimize ALU ARSH K using asr immediate instruction
arch/arm/net/bpf_jit_32.c | 14 +++++++++-----
arch/arm/net/bpf_jit_32.h | 2 ++
2 files changed, 11 insertions(+), 5 deletions(-)
--
2.17.1
next reply other threads:[~2020-05-01 2:02 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-01 2:02 Luke Nelson [this message]
2020-05-01 2:02 ` [PATCH bpf-next 1/2] bpf, arm: Optimize ALU64 ARSH X using orrpl conditional instruction Luke Nelson
2020-05-01 2:02 ` [PATCH bpf-next 2/2] bpf, arm: Optimize ALU ARSH K using asr immediate instruction Luke Nelson
2020-05-04 16:05 ` [PATCH bpf 0/2] bpf, arm: Small JIT optimizations Daniel Borkmann
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