From patchwork Thu Apr 21 08:16:38 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Luca Fancellu X-Patchwork-Id: 12821287 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 36CA2C433F5 for ; Thu, 21 Apr 2022 08:17:16 +0000 (UTC) Received: from list by lists.xenproject.org with outflank-mailman.309843.526333 (Exim 4.92) (envelope-from ) id 1nhRzp-0002nn-Lv; Thu, 21 Apr 2022 08:17:01 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 309843.526333; Thu, 21 Apr 2022 08:17:01 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1nhRzp-0002ng-Gh; Thu, 21 Apr 2022 08:17:01 +0000 Received: by outflank-mailman (input) for mailman id 309843; Thu, 21 Apr 2022 08:16:59 +0000 Received: from se1-gles-sth1-in.inumbo.com ([159.253.27.254] helo=se1-gles-sth1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1nhRzn-0002nP-Np for xen-devel@lists.xenproject.org; Thu, 21 Apr 2022 08:16:59 +0000 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by se1-gles-sth1.inumbo.com (Halon) with ESMTP id 68a05d1d-c14b-11ec-a405-831a346695d4; Thu, 21 Apr 2022 10:16:57 +0200 (CEST) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id EDD921480; Thu, 21 Apr 2022 01:16:55 -0700 (PDT) Received: from e125770.cambridge.arm.com (e125770.cambridge.arm.com [10.1.195.16]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 60D153F73B; Thu, 21 Apr 2022 01:16:55 -0700 (PDT) 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: 68a05d1d-c14b-11ec-a405-831a346695d4 From: Luca Fancellu To: xen-devel@lists.xenproject.org Cc: bertrand.marquis@arm.com, wei.chen@arm.com Subject: [PATCH v8 0/7] Boot time cpupools Date: Thu, 21 Apr 2022 09:16:38 +0100 Message-Id: <20220421081645.40235-1-luca.fancellu@arm.com> X-Mailer: git-send-email 2.17.1 This serie introduces a feature for Xen to create cpu pools at boot time, the feature is enabled using a configurable that is disabled by default. The boot time cpupool feature relies on the device tree to describe the cpu pools. Another feature is introduced by the serie, the possibility to assign a dom0less guest to a cpupool at boot time. Here follows an example, Xen is built with CONFIG_BOOT_TIME_CPUPOOLS=y. From the DT: [...] a72_0: cpu@0 { compatible = "arm,cortex-a72"; reg = <0x0 0x0>; device_type = "cpu"; [...] }; a72_1: cpu@1 { compatible = "arm,cortex-a72"; reg = <0x0 0x1>; device_type = "cpu"; [...] }; a53_0: cpu@100 { compatible = "arm,cortex-a53"; reg = <0x0 0x100>; device_type = "cpu"; [...] }; a53_1: cpu@101 { compatible = "arm,cortex-a53"; reg = <0x0 0x101>; device_type = "cpu"; [...] }; a53_2: cpu@102 { compatible = "arm,cortex-a53"; reg = <0x0 0x102>; device_type = "cpu"; [...] }; a53_3: cpu@103 { compatible = "arm,cortex-a53"; reg = <0x0 0x103>; device_type = "cpu"; [...] }; chosen { #size-cells = <0x1>; #address-cells = <0x1>; xen,dom0-bootargs = "..."; xen,xen-bootargs = "..."; cpupool0 { compatible = "xen,cpupool"; cpupool-cpus = <&a72_0 &a72_1>; cpupool-sched = "credit2"; }; cp1: cpupool1 { compatible = "xen,cpupool"; cpupool-cpus = <&a53_0 &a53_1 &a53_2 &a53_3>; cpupool-sched = "null"; }; module@0 { reg = <0x80080000 0x1300000>; compatible = "multiboot,module"; }; domU1 { #size-cells = <0x1>; #address-cells = <0x1>; compatible = "xen,domain"; cpus = <1>; memory = <0 0xC0000>; vpl011; domain-cpupool = <&cp1>; module@92000000 { compatible = "multiboot,kernel", "multiboot,module"; reg = <0x92000000 0x1ffffff>; bootargs = "..."; }; }; }; [...] The example DT is instructing Xen to have two cpu pools, one having two phisical cpus and the one having 4 phisical cpus, the last mentioned cpu pool uses the null scheduler and from the /chosen node we can see that a dom0less guest will be started on that cpu pool. In this particular case Xen must boot with different type of cpus, so the boot argument hmp_unsafe must be enabled. Luca Fancellu (7): tools/cpupools: Give a name to unnamed cpupools xen/sched: create public function for cpupools creation xen/sched: retrieve scheduler id by name xen/cpupool: Create different cpupools at boot time xen/cpupool: Don't allow removing cpu0 from cpupool0 arm/dom0less: assign dom0less guests to cpupools xen/cpupool: Allow cpupool0 to use different scheduler MAINTAINERS | 2 +- docs/misc/arm/device-tree/booting.txt | 5 + docs/misc/arm/device-tree/cpupools.txt | 140 +++++++++++++++ tools/helpers/xen-init-dom0.c | 37 +++- tools/libs/light/libxl_utils.c | 3 +- xen/arch/arm/domain_build.c | 19 +- xen/arch/arm/include/asm/smp.h | 3 + xen/common/domain.c | 2 +- xen/common/sched/Kconfig | 7 + xen/common/sched/Makefile | 1 + xen/common/sched/boot-cpupool.c | 234 +++++++++++++++++++++++++ xen/common/sched/core.c | 40 +++-- xen/common/sched/cpupool.c | 43 ++++- xen/include/public/domctl.h | 5 +- xen/include/xen/sched.h | 53 ++++++ 15 files changed, 563 insertions(+), 31 deletions(-) create mode 100644 docs/misc/arm/device-tree/cpupools.txt create mode 100644 xen/common/sched/boot-cpupool.c