From patchwork Sat Feb 19 03:15:02 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tiezhu Yang X-Patchwork-Id: 12752135 X-Patchwork-Delegate: bpf@iogearbox.net Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B7D46C4321E for ; Sat, 19 Feb 2022 03:15:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241263AbiBSDPd (ORCPT ); Fri, 18 Feb 2022 22:15:33 -0500 Received: from mxb-00190b01.gslb.pphosted.com ([23.128.96.19]:36020 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240940AbiBSDPa (ORCPT ); Fri, 18 Feb 2022 22:15:30 -0500 Received: from loongson.cn (mail.loongson.cn [114.242.206.163]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 9DC0C50B12; Fri, 18 Feb 2022 19:15:10 -0800 (PST) Received: from linux.localdomain (unknown [113.200.148.30]) by mail.loongson.cn (Coremail) with SMTP id AQAAf9DxWMm3YBBi94UDAA--.2803S4; Sat, 19 Feb 2022 11:15:05 +0800 (CST) From: Tiezhu Yang To: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh Cc: Xuefeng Li , netdev@vger.kernel.org, bpf@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH bpf-next v2 2/2] bpf: Make BPF_JIT_DEFAULT_ON selectable in Kconfig Date: Sat, 19 Feb 2022 11:15:02 +0800 Message-Id: <1645240502-13398-3-git-send-email-yangtiezhu@loongson.cn> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1645240502-13398-1-git-send-email-yangtiezhu@loongson.cn> References: <1645240502-13398-1-git-send-email-yangtiezhu@loongson.cn> X-CM-TRANSID: AQAAf9DxWMm3YBBi94UDAA--.2803S4 X-Coremail-Antispam: 1UD129KBjvJXoW7KF1kuw4UKw13uFykAF1rtFb_yoW8urWDpw 1Yqw1Fkr92gr1fKayxCa47uF45Gw1UWr1UCFsxJ34UXF93AasrZr1ktr17XF47Zr92qa1Y qrZ3u3WkXa1UW37anT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUPK14x267AKxVWrJVCq3wAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2048vs2IY020E87I2jVAFwI0_Jryl82xGYIkIc2 x26xkF7I0E14v26ryj6s0DM28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48ve4kI8wA2z4x0 Y4vE2Ix0cI8IcVAFwI0_JFI_Gr1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI0_Gr0_Cr1l84 ACjcxK6I8E87Iv67AKxVW8Jr0_Cr1UM28EF7xvwVC2z280aVCY1x0267AKxVW8Jr0_Cr1U M2AIxVAIcxkEcVAq07x20xvEncxIr21l5I8CrVACY4xI64kE6c02F40Ex7xfMcIj6xIIjx v20xvE14v26r1j6r18McIj6I8E87Iv67AKxVWUJVW8JwAm72CE4IkC6x0Yz7v_Jr0_Gr1l F7xvr2IYc2Ij64vIr41lF7I21c0EjII2zVCS5cI20VAGYxC7M4IIrI8v6xkF7I0E8cxan2 IY04v7MxkIecxEwVAFwVW8GwCF04k20xvY0x0EwIxGrwCFx2IqxVCFs4IE7xkEbVWUJVW8 JwC20s026c02F40E14v26r1j6r18MI8I3I0E7480Y4vE14v26r106r1rMI8E67AF67kF1V AFwI0_Jw0_GFylIxkGc2Ij64vIr41lIxAIcVC0I7IYx2IY67AKxVWUJVWUCwCI42IY6xII jxv20xvEc7CjxVAFwI0_Gr0_Cr1lIxAIcVCF04k26cxKx2IYs7xG6r1j6r1xMIIF0xvEx4 A2jsIE14v26r1j6r4UMIIF0xvEx4A2jsIEc7CjxVAFwI0_Gr0_Gr1UYxBIdaVFxhVjvjDU 0xZFpf9x0JUajgcUUUUU= X-CM-SenderInfo: p1dqw3xlh2x3gn0dqz5rrqw2lrqou0/ Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net Currently, only x86, arm64 and s390 select ARCH_WANT_DEFAULT_BPF_JIT, the other archs do not select ARCH_WANT_DEFAULT_BPF_JIT. On the archs without ARCH_WANT_DEFAULT_BPF_JIT, if we want to set bpf_jit_enable to 1 by default, the only way is to enable CONFIG_BPF_JIT_ALWAYS_ON, then the users can not change it to 0 or 2, it seems bad for some users. We can select ARCH_WANT_DEFAULT_BPF_JIT for those archs if it is proper, but at least for now, make BPF_JIT_DEFAULT_ON selectable can give them a chance. Additionally, with this patch, under !BPF_JIT_ALWAYS_ON, we can disable BPF_JIT_DEFAULT_ON on the archs with ARCH_WANT_DEFAULT_BPF_JIT when make menuconfig, it seems flexible for some developers. Signed-off-by: Tiezhu Yang --- kernel/bpf/Kconfig | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/kernel/bpf/Kconfig b/kernel/bpf/Kconfig index cbf3f65..461ac60 100644 --- a/kernel/bpf/Kconfig +++ b/kernel/bpf/Kconfig @@ -54,6 +54,7 @@ config BPF_JIT config BPF_JIT_ALWAYS_ON bool "Permanently enable BPF JIT and remove BPF interpreter" depends on BPF_SYSCALL && HAVE_EBPF_JIT && BPF_JIT + select BPF_JIT_DEFAULT_ON help Enables BPF JIT and removes BPF interpreter to avoid speculative execution of BPF instructions by the interpreter. @@ -63,8 +64,16 @@ config BPF_JIT_ALWAYS_ON in failure. config BPF_JIT_DEFAULT_ON - def_bool ARCH_WANT_DEFAULT_BPF_JIT || BPF_JIT_ALWAYS_ON - depends on HAVE_EBPF_JIT && BPF_JIT + bool "Defaultly enable BPF JIT and remove BPF interpreter" + default y if ARCH_WANT_DEFAULT_BPF_JIT + depends on BPF_SYSCALL && HAVE_EBPF_JIT && BPF_JIT + help + Enables BPF JIT and removes BPF interpreter to avoid speculative + execution of BPF instructions by the interpreter. + + When CONFIG_BPF_JIT_DEFAULT_ON is enabled but CONFIG_BPF_JIT_ALWAYS_ON + is disabled, /proc/sys/net/core/bpf_jit_enable is set to 1 by default + and can be changed to 0 or 2. config BPF_UNPRIV_DEFAULT_OFF bool "Disable unprivileged BPF by default"