From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.9 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_GIT autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 70CCCC47247 for ; Fri, 1 May 2020 02:02:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 367422073E for ; Fri, 1 May 2020 02:02:22 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=cs.washington.edu header.i=@cs.washington.edu header.b="CarECDVW" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727970AbgEACCV (ORCPT ); Thu, 30 Apr 2020 22:02:21 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56582 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1727889AbgEACCU (ORCPT ); Thu, 30 Apr 2020 22:02:20 -0400 Received: from mail-pf1-x442.google.com (mail-pf1-x442.google.com [IPv6:2607:f8b0:4864:20::442]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6D4A3C035494 for ; Thu, 30 Apr 2020 19:02:20 -0700 (PDT) Received: by mail-pf1-x442.google.com with SMTP id r14so971326pfg.2 for ; Thu, 30 Apr 2020 19:02:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cs.washington.edu; s=goo201206; h=from:to:cc:subject:date:message-id; bh=xA0+ztltjFSmlxto0oGrs/28x8dQq3lRcLWb+lb2nnI=; b=CarECDVW+6KLvf/YyEzSNITvnJPj0ybvXe2NxRdC1e07BJ5Wzhrm9MnEpFVjJZX7kE AwSajPjRdMdF0h8zUllcxmIy5i2ceyZbmkevlmDHXGOxVjdaZJuDGWRh8r7k9Ok+Enbz mGPfKsaD8R4c4uSPSv6J5/mxtLCMQpUX6zVHA= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id; bh=xA0+ztltjFSmlxto0oGrs/28x8dQq3lRcLWb+lb2nnI=; b=l9+qog/rNSURHmDBeNpzYJJAMGte7wP0fZx1pPWNIcHkh4r1fmhqOeUGzmqbjPP0Xu 3K4/vFPFXwBJgm5xVcooNWdiHjC9j4lpPHkO6Lc1KJuyjNFnFBFrz7U9+rO1FnSFoIBE mUDAk9mk3/SHzLI5KoeDFwxxc2AJItV8N4d/jG6qZE8HfT6WAxW6CQYDP0WQLgEFAhFI VOofODMksRoQlhTkwn/gELWheSNIJZ6azl11wHcaELi7Cr1/SOabRBI6tVwWNGiawATU Emr9r0ZLrPxp10Yw491kSc8uKN9i1c+LqDEiF24RQuHRQFIuFx57d507ErDHq9tTRRKx 5fMA== X-Gm-Message-State: AGi0PuY2MJwKw+Fha5fyWvie+8M+Q0kx9KTmrtxqdqil8jM6uyUOPYRK 4u8S4VULT1q6Z6U/KdbbTuPpIg== X-Google-Smtp-Source: APiQypJhA82+WhNBkkgzPwnXofGL1GnfNooa4CgxEhzB9JSc3x78tYjLRLZVYOiIolegraWmwYU2Qg== X-Received: by 2002:a65:4645:: with SMTP id k5mr1943443pgr.115.1588298539843; Thu, 30 Apr 2020 19:02:19 -0700 (PDT) Received: from localhost.localdomain (c-73-53-94-119.hsd1.wa.comcast.net. [73.53.94.119]) by smtp.gmail.com with ESMTPSA id fy21sm802915pjb.25.2020.04.30.19.02.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Apr 2020 19:02:19 -0700 (PDT) From: Luke Nelson X-Google-Original-From: Luke Nelson To: bpf@vger.kernel.org Cc: Luke Nelson , Shubham Bansal , Russell King , Alexei Starovoitov , Daniel Borkmann , Martin KaFai Lau , Song Liu , Yonghong Song , Andrii Nakryiko , John Fastabend , KP Singh , 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 Message-Id: <20200501020210.32294-1-luke.r.nels@gmail.com> X-Mailer: git-send-email 2.17.1 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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