From patchwork Mon Mar 31 23:05:24 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Denis Mukhin X-Patchwork-Id: 14034190 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 lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (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 07B5DC3600C for ; Mon, 31 Mar 2025 23:05:54 +0000 (UTC) Received: from list by lists.xenproject.org with outflank-mailman.933113.1335135 (Exim 4.92) (envelope-from ) id 1tzOCG-0003Iq-Bm; Mon, 31 Mar 2025 23:05:36 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 933113.1335135; Mon, 31 Mar 2025 23:05:36 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1tzOCG-0003Ij-93; Mon, 31 Mar 2025 23:05:36 +0000 Received: by outflank-mailman (input) for mailman id 933113; Mon, 31 Mar 2025 23:05:34 +0000 Received: from se1-gles-flk1-in.inumbo.com ([94.247.172.50] helo=se1-gles-flk1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1tzOCD-0003Id-Fl for xen-devel@lists.xenproject.org; Mon, 31 Mar 2025 23:05:34 +0000 Received: from mail-24418.protonmail.ch (mail-24418.protonmail.ch [109.224.244.18]) by se1-gles-flk1.inumbo.com (Halon) with ESMTPS id a3c8ebde-0e84-11f0-9ffb-bf95429c2676; Tue, 01 Apr 2025 01:05:29 +0200 (CEST) X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: a3c8ebde-0e84-11f0-9ffb-bf95429c2676 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=proton.me; s=protonmail; t=1743462328; x=1743721528; bh=bx402NalM9Q9561gDSzMNIBVydfKL7X0jaCGQHifp7Q=; h=Date:To:From:Cc:Subject:Message-ID:Feedback-ID:From:To:Cc:Date: Subject:Reply-To:Feedback-ID:Message-ID:BIMI-Selector: List-Unsubscribe:List-Unsubscribe-Post; b=O+P5iBK2RFFDqIoNVIgO2n8Dujp7YJOJ618PNTq7XBtWz50t8U5QqLnMh8p7VXDN5 Z6NJ3IPF2vDnDDXzSuPfc9DzZ3RvrATqB1gqsNnfbcoaK6xjer5jKGiA7JKhbh9DSd aeBSuMdfeihF2uqge484jtikT4yQEcYgTYT3iXopQmkQVVNInZNkQEP25Hoj6BJnMA V5PT0J+b2M84tWq2IW4TRKnusHhnb7l8QUDV7OT+dZcd3RrZqDBA8EUxT5S8++nqbR pD7JAuZZP5f3q1L4iAMqVo56vZPzkRJT+OV/0Ec2uz98UrI1yWAJvAw19xW9PuDkef FCZBrsf1HmTpA== Date: Mon, 31 Mar 2025 23:05:24 +0000 To: xen-devel@lists.xenproject.org From: dmkhn@proton.me Cc: andrew.cooper3@citrix.com, anthony.perard@vates.tech, jbeulich@suse.com, julien@xen.org, michal.orzel@amd.com, roger.pau@citrix.com, sstabellini@kernel.org, dmukhin@ford.com Subject: [PATCH v2 0/7] xen/console: cleanup console input switch logic Message-ID: <20250331230508.440198-1-dmukhin@ford.com> Feedback-ID: 123220910:user:proton X-Pm-Message-ID: db5457489bbde1121d88189599b6978ebbff108d MIME-Version: 1.0 Currently, on x86, console input can be rotated in round-robin manner only between dom0, PV shim, and Xen itself. On Arm the input rotation can include domUs with vpl011. The patch series introduces the concept of "console focus", which is defined as the ID of the domain that currently owns the physical console input. The patch series originates from the NS16550 UART emulator series [1] for x86, which requires ability to switch physical console input to a PVH/HVM domain with an emulated UART. The main idea is introducing a per-domain permission flag that is set during domain initialization and used by the console driver to switch the input across permitted domains. Patch 1 introduces a new domain permission flag to mark ownership of the console input for the console driver. Patches 2, 3 prepare console driver to allow console input rotation across multiple domains based on the new permission flag. Patch 3 depends on patch 2. Patches 4, 5 perform mechanical renames to fit the usage in the code. Patch 6 cleans up the console input switch logic; depends on patches 3, 4, 5. Patch 7 simplifies the existing vUART code by using newly introduced APIs, depends on patch 5. [1] https://lore.kernel.org/xen-devel/20250103-vuart-ns8250-v3-v1-0-c5d36b31d66c@ford.com/ [2] Link to CI: https://gitlab.com/xen-project/people/dmukhin/xen/-/pipelines/1745537898 [3] Link to v1: https://lore.kernel.org/xen-devel/20250318233617.849903-1-dmukhin@ford.com/ Denis Mukhin (7): xen/console: introduce console input permission xen/domain: introduce domid_alloc() xen/domain: introduce domid_top() xen/console: rename switch_serial_input() to console_switch_input() xen/console: rename console_rx to console_focus xen/console: introduce console_set_focus() xen/console: introduce console_get_focus() xen/arch/arm/dom0less-build.c | 15 ++-- xen/arch/arm/domain_build.c | 19 +++-- xen/arch/arm/include/asm/setup.h | 2 - xen/arch/arm/setup.c | 2 - xen/arch/arm/vpl011.c | 7 +- xen/arch/ppc/include/asm/setup.h | 2 - xen/arch/riscv/include/asm/setup.h | 2 - xen/arch/x86/include/asm/setup.h | 2 - xen/arch/x86/pv/shim.c | 2 + xen/arch/x86/setup.c | 8 +- xen/common/domain.c | 70 +++++++++++++++++ xen/common/domctl.c | 45 +---------- xen/drivers/char/console.c | 121 ++++++++++++++++------------- xen/include/xen/console.h | 3 +- xen/include/xen/domain.h | 4 + xen/include/xen/sched.h | 8 +- 16 files changed, 186 insertions(+), 126 deletions(-)