From patchwork Fri Nov 27 19:32:31 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gabriel Krisman Bertazi X-Patchwork-Id: 11938157 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=-11.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,UNPARSEABLE_RELAY,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 BD6CCC83010 for ; Sat, 28 Nov 2020 22:13:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 88A5D21534 for ; Sat, 28 Nov 2020 22:13:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389296AbgK1Vt5 (ORCPT ); Sat, 28 Nov 2020 16:49:57 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54760 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729763AbgK0TrT (ORCPT ); Fri, 27 Nov 2020 14:47:19 -0500 Received: from bhuna.collabora.co.uk (bhuna.collabora.co.uk [IPv6:2a00:1098:0:82:1000:25:2eeb:e3e3]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E1A76C08E861; Fri, 27 Nov 2020 11:36:53 -0800 (PST) Received: from [127.0.0.1] (localhost [127.0.0.1]) (Authenticated sender: krisman) with ESMTPSA id 462581F4659E From: Gabriel Krisman Bertazi To: luto@kernel.org, tglx@linutronix.de, keescook@chromium.org Cc: gofmanp@gmail.com, christian.brauner@ubuntu.com, peterz@infradead.org, willy@infradead.org, shuah@kernel.org, linux-kernel@vger.kernel.org, linux-api@vger.kernel.org, linux-kselftest@vger.kernel.org, x86@kernel.org, Gabriel Krisman Bertazi , kernel@collabora.com Subject: [PATCH v8 0/7] Syscall User Dispatch Date: Fri, 27 Nov 2020 14:32:31 -0500 Message-Id: <20201127193238.821364-1-krisman@collabora.com> X-Mailer: git-send-email 2.29.2 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Hi, This is v8 of syscall user dispatch. Last version got some acks but there was one small documentation fix I wanted to do, as requested by Florian. This also addresses the commit message fixup Peter requested. The only actual code change from v7 is solving a trivial merge conflict I myself created with the entry code fixup I made week and with something else in the TIP tree. I also shared this with glibc and there wasn't any complaints other than the matter about user-notif vs. siginfo, which was discussed in v7 and the understanding is that it is not necessary now and can be added later, if needed, on the same infrastructure without a new api. I'm not sure about TIP the rules, but is it too late to be queued for the next merge window? I'd love to have this in 5.11 if possible, since it has been flying for quite a while. This is based on tip/master. As usual, a working tree with this patchset is available at: https://gitlab.collabora.com/krisman/linux -b syscall-user-dispatch-v8 Previous submissions are archived at: RFC/v1: https://lkml.org/lkml/2020/7/8/96 v2: https://lkml.org/lkml/2020/7/9/17 v3: https://lkml.org/lkml/2020/7/12/4 v4: https://www.spinics.net/lists/linux-kselftest/msg16377.html v5: https://lkml.org/lkml/2020/8/10/1320 v6: https://lkml.org/lkml/2020/9/4/1122 v7: https://lwn.net/Articles/837598/ Gabriel Krisman Bertazi (7): x86: vdso: Expose sigreturn address on vdso to the kernel signal: Expose SYS_USER_DISPATCH si_code type kernel: Implement selective syscall userspace redirection entry: Support Syscall User Dispatch on common syscall entry selftests: Add kselftest for syscall user dispatch selftests: Add benchmark for syscall user dispatch docs: Document Syscall User Dispatch .../admin-guide/syscall-user-dispatch.rst | 87 +++++ arch/x86/entry/vdso/vdso2c.c | 2 + arch/x86/entry/vdso/vdso32/sigreturn.S | 2 + arch/x86/entry/vdso/vma.c | 15 + arch/x86/include/asm/elf.h | 2 + arch/x86/include/asm/vdso.h | 2 + arch/x86/kernel/signal_compat.c | 2 +- fs/exec.c | 3 + include/linux/entry-common.h | 2 + include/linux/sched.h | 2 + include/linux/syscall_user_dispatch.h | 40 +++ include/linux/thread_info.h | 2 + include/uapi/asm-generic/siginfo.h | 3 +- include/uapi/linux/prctl.h | 5 + kernel/entry/Makefile | 2 +- kernel/entry/common.c | 17 + kernel/entry/common.h | 16 + kernel/entry/syscall_user_dispatch.c | 102 ++++++ kernel/fork.c | 1 + kernel/sys.c | 5 + tools/testing/selftests/Makefile | 1 + .../syscall_user_dispatch/.gitignore | 3 + .../selftests/syscall_user_dispatch/Makefile | 9 + .../selftests/syscall_user_dispatch/config | 1 + .../syscall_user_dispatch/sud_benchmark.c | 200 +++++++++++ .../syscall_user_dispatch/sud_test.c | 310 ++++++++++++++++++ 26 files changed, 833 insertions(+), 3 deletions(-) create mode 100644 Documentation/admin-guide/syscall-user-dispatch.rst create mode 100644 include/linux/syscall_user_dispatch.h create mode 100644 kernel/entry/common.h create mode 100644 kernel/entry/syscall_user_dispatch.c create mode 100644 tools/testing/selftests/syscall_user_dispatch/.gitignore create mode 100644 tools/testing/selftests/syscall_user_dispatch/Makefile create mode 100644 tools/testing/selftests/syscall_user_dispatch/config create mode 100644 tools/testing/selftests/syscall_user_dispatch/sud_benchmark.c create mode 100644 tools/testing/selftests/syscall_user_dispatch/sud_test.c Reviewed-by: Andy Lutomirski