From patchwork Sat Aug 31 04:19:32 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pu Lehui X-Patchwork-Id: 13785921 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 0EE48C5474C for ; Sat, 31 Aug 2024 04:17:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=RrQFIDWG2Q1L3Nwc6LpElL4MLEFjAhNR+7rK0gOkUXY=; b=ZaCdJUQp77066l UFuh3IS6Ahg6gui8pXpPLYEF9qEMvDWyFmjeD+JKEybjOv1MWX0bkwsBCz0iwqrRHh+cA7PXViW5m kUpZXdRR3aBWiWRDLA681/4eeIfBuIi+Ft/qGkgGA1cySkjrC3iz2AAZkAIXsCXLnwVXdURtKhYVF 8m1NgYXvgHaPCveg7MR43Iegdzbo/4HpWN2SbGONqLiro7pM0o3edeyR8RQtZiL/01evdYUzBqaHw mnDqpffZT8+RLu+Le/V9wpxmnL8Yl2fEPhf11VBojK7JOXg8RrhhVoXKR8MdjNMwHOL6k2LLmLbqF F0aU/SajxF6kTQn+83fA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1skFXq-00000008Uo5-0v2N; Sat, 31 Aug 2024 04:17:02 +0000 Received: from dggsgout12.his.huawei.com ([45.249.212.56]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1skFXm-00000008UmN-3qoc for linux-riscv@lists.infradead.org; Sat, 31 Aug 2024 04:17:01 +0000 Received: from mail.maildlp.com (unknown [172.19.163.235]) by dggsgout12.his.huawei.com (SkyGuard) with ESMTP id 4WwhY21JKCz4f3jXT for ; Sat, 31 Aug 2024 12:16:38 +0800 (CST) Received: from mail02.huawei.com (unknown [10.116.40.75]) by mail.maildlp.com (Postfix) with ESMTP id E96921A06DC for ; Sat, 31 Aug 2024 12:16:52 +0800 (CST) Received: from ultra.huawei.com (unknown [10.90.53.71]) by APP2 (Coremail) with SMTP id Syh0CgBnT74ymdJmoSHHDA--.65422S4; Sat, 31 Aug 2024 12:16:52 +0800 (CST) From: Pu Lehui To: bpf@vger.kernel.org, linux-riscv@lists.infradead.org, netdev@vger.kernel.org, Andrii Nakryiko Cc: =?utf-8?b?QmrDtnJuIFTDtnBlbA==?= , Ilya Leoshkevich , Alexei Starovoitov , Daniel Borkmann , Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Puranjay Mohan , Palmer Dabbelt , Pu Lehui Subject: [PATCH bpf-next v3 2/4] libbpf: Access first syscall argument with CO-RE direct read on arm64 Date: Sat, 31 Aug 2024 04:19:32 +0000 Message-Id: <20240831041934.1629216-3-pulehui@huaweicloud.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240831041934.1629216-1-pulehui@huaweicloud.com> References: <20240831041934.1629216-1-pulehui@huaweicloud.com> MIME-Version: 1.0 X-CM-TRANSID: Syh0CgBnT74ymdJmoSHHDA--.65422S4 X-Coremail-Antispam: 1UD129KBjvJXoW7uF17Zr1rWry5Xry3CFWUXFb_yoW8XFW8pF WUCa47Kr18Ww4jkasrKF4avF13tws5twsrJF97WayS9FWUt393X3W2grZ0kw4avrW5Gw4Y vr9Fkr18G3W7Z37anT9S1TB71UUUUUDqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUPIb4IE77IF4wAFF20E14v26rWj6s0DM7CY07I20VC2zVCF04k2 6cxKx2IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M28IrcIa0xkI8VA2jI8067AKxVWUXw A2048vs2IY020Ec7CjxVAFwI0_Xr0E3s1l8cAvFVAK0II2c7xJM28CjxkF64kEwVA0rcxS w2x7M28EF7xvwVC0I7IYx2IY67AKxVW5JVW7JwA2z4x0Y4vE2Ix0cI8IcVCY1x0267AKxV W8Jr0_Cr1UM28EF7xvwVC2z280aVAFwI0_GcCE3s1l84ACjcxK6I8E87Iv6xkF7I0E14v2 6rxl6s0DM2AIxVAIcxkEcVAq07x20xvEncxIr21l5I8CrVACY4xI64kE6c02F40Ex7xfMc Ij6xIIjxv20xvE14v26r1j6r18McIj6I8E87Iv67AKxVWUJVW8JwAm72CE4IkC6x0Yz7v_ Jr0_Gr1lF7xvr2IYc2Ij64vIr41lFIxGxcIEc7CjxVA2Y2ka0xkIwI1lc7CjxVAaw2AFwI 0_GFv_Wryl42xK82IYc2Ij64vIr41l4I8I3I0E4IkC6x0Yz7v_Jr0_Gr1lx2IqxVAqx4xG 67AKxVWUJVWUGwC20s026x8GjcxK67AKxVWUGVWUWwC2zVAF1VAY17CE14v26r4a6rW5MI IYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcVAFwI0_Jr0_JF4lIxAIcVC0I7IYx2IY6xkF7I0E 14v26F4j6r4UJwCI42IY6xAIw20EY4v20xvaj40_Jr0_JF4lIxAIcVC2z280aVAFwI0_Gr 0_Cr1lIxAIcVC2z280aVCY1x0267AKxVW8Jr0_Cr1UYxBIdaVFxhVjvjDU0xZFpf9x07jI sjbUUUUU= X-CM-SenderInfo: psxovxtxl6x35dzhxuhorxvhhfrp/ X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240830_211659_834342_56937F17 X-CRM114-Status: UNSURE ( 8.74 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org From: Pu Lehui Currently PT_REGS_PARM1 SYSCALL(x) is consistent with PT_REGS_PARM1_CORE SYSCALL(x), which will introduce the overhead of BPF_CORE_READ(), taking into account the read pt_regs comes directly from the context, let's use CO-RE direct read to access the first system call argument. Suggested-by: Andrii Nakryiko Signed-off-by: Pu Lehui Acked-by: Xu Kuohai --- tools/lib/bpf/bpf_tracing.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/tools/lib/bpf/bpf_tracing.h b/tools/lib/bpf/bpf_tracing.h index e7d9382efeb3..051c408e6aed 100644 --- a/tools/lib/bpf/bpf_tracing.h +++ b/tools/lib/bpf/bpf_tracing.h @@ -222,7 +222,7 @@ struct pt_regs___s390 { struct pt_regs___arm64 { unsigned long orig_x0; -}; +} __attribute__((preserve_access_index)); /* arm64 provides struct user_pt_regs instead of struct pt_regs to userspace */ #define __PT_REGS_CAST(x) ((const struct user_pt_regs *)(x)) @@ -241,7 +241,7 @@ struct pt_regs___arm64 { #define __PT_PARM4_SYSCALL_REG __PT_PARM4_REG #define __PT_PARM5_SYSCALL_REG __PT_PARM5_REG #define __PT_PARM6_SYSCALL_REG __PT_PARM6_REG -#define PT_REGS_PARM1_SYSCALL(x) PT_REGS_PARM1_CORE_SYSCALL(x) +#define PT_REGS_PARM1_SYSCALL(x) (((const struct pt_regs___arm64 *)(x))->orig_x0) #define PT_REGS_PARM1_CORE_SYSCALL(x) \ BPF_CORE_READ((const struct pt_regs___arm64 *)(x), __PT_PARM1_SYSCALL_REG)