From patchwork Tue Jun 8 18:02:53 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Will Deacon X-Patchwork-Id: 12307825 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=-12.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 A5875C47082 for ; Tue, 8 Jun 2021 18:05:58 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 6B24061376 for ; Tue, 8 Jun 2021 18:05:58 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6B24061376 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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: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:In-Reply-To:References: List-Owner; bh=GwLfUrCpr63injT6Sm1jqziVXtx2y6K2A9DdtHmI948=; b=UeC3u3d6jG+/h+ G9X62vSWp8PFLcceGHUVMu2UWwC77Wg3OJvtba2jQQAdFxG1ihdmCz+tJE1wppkJ8QkL031Q+hwy9 LX4faf1yoGk7w40/J+dr3FSWDnv6SrGxOolE7vPqU0dBCJwe5Y5yRvjEQQvHvl4KyMwJfNLMKjrtV Sl+PNQvTafzuP58eLWRSWXz368wxSPFTBz4kQMfd2jsqdeUCEPW4eOHaPCFHE9GiyxATS88wiECWp w9K9r90Zy7eUfoQctEhI228rzJDSzYAWI6G3pohwIe4YKfAXe7Dr+naLSe4zHwoZNBv/pGbE0z+Bw xp6Dh2HN6aiqPvCmc6Lw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1lqg4c-009qgt-US; Tue, 08 Jun 2021 18:03:35 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1lqg4V-009qeU-D0 for linux-arm-kernel@lists.infradead.org; Tue, 08 Jun 2021 18:03:31 +0000 Received: by mail.kernel.org (Postfix) with ESMTPSA id 7A19361376; Tue, 8 Jun 2021 18:03:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1623175407; bh=NcujDDXF1n/aqovTU+s65bQnPyqX0sU2KIFBfkdTF80=; h=From:To:Cc:Subject:Date:From; b=LZH20+6sC4MpdtBvfvpJ4bA7kaS7JYa9hKBEiZ5X0aN/sRIMro0aXl+FmEKysLD38 c3YC1STSZuYz0vLkUbsqQy65nUZj5z0LkB640rnZI6L2SRkOi0hT6t9zPZoiTDLRnh a+xQUba+0ali3YJoKJvJwXgPoO3hPl7QjzkCjH74ZTzVr9jyL9u2JFiXWbxMDkoT4E FIp78FKMdxJzhjF4aIUl1WFt9XgI9rqh3UrfF3YCwbYPyfNYECg92GyydMMuWNld9Y MKbNKox8UxP5hAZH5MZiv9lrMoHIGvkYVj9JZ7sJiV0TKyXlXAYIVix75SV5ambZNq UpyNIGGBPEWsw== From: Will Deacon To: linux-arm-kernel@lists.infradead.org Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, Will Deacon , Catalin Marinas , Marc Zyngier , Greg Kroah-Hartman , Peter Zijlstra , Morten Rasmussen , Qais Yousef , Suren Baghdasaryan , Quentin Perret , Tejun Heo , Johannes Weiner , Ingo Molnar , Juri Lelli , Vincent Guittot , "Rafael J. Wysocki" , Dietmar Eggemann , Daniel Bristot de Oliveira , Valentin Schneider , Mark Rutland , kernel-team@android.com Subject: [PATCH v9 00/20] Add support for 32-bit tasks on asymmetric AArch32 systems Date: Tue, 8 Jun 2021 19:02:53 +0100 Message-Id: <20210608180313.11502-1-will@kernel.org> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210608_110327_498020_30056DAE X-CRM114-Status: GOOD ( 12.18 ) X-BeenThere: linux-arm-kernel@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-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi everyone, The sun is shining and its time for your weekly dose of asymmetric 32-bit support patches, previously seen at: v1: https://lore.kernel.org/r/20201027215118.27003-1-will@kernel.org v2: https://lore.kernel.org/r/20201109213023.15092-1-will@kernel.org v3: https://lore.kernel.org/r/20201113093720.21106-1-will@kernel.org v4: https://lore.kernel.org/r/20201124155039.13804-1-will@kernel.org v5: https://lore.kernel.org/r/20201208132835.6151-1-will@kernel.org v6: https://lore.kernel.org/r/20210518094725.7701-1-will@kernel.org v7: https://lore.kernel.org/r/20210525151432.16875-1-will@kernel.org v8: https://lore.kernel.org/r/20210602164719.31777-1-will@kernel.org There was also a nice LWN writeup in case you've forgotten what this is about: https://lwn.net/Articles/838339/ Changes since v8 include: * Renamed task_cpus_dl_admissible() and changed return type [Daniel] * Renamed update_mismatched_32bit_el0_cpu_features() [Mark R] * Improved comments [Mark R and Valentin] * Cleaned up cpuset_cpus_allowed_fallback() [Valentin] * Remove redundant rcu_read_{lock,unlock}() in cpuset_cpus_allowed() * Added some more acks/reviewed-by tags Cheers, Will Cc: Catalin Marinas Cc: Marc Zyngier Cc: Greg Kroah-Hartman Cc: Peter Zijlstra Cc: Morten Rasmussen Cc: Qais Yousef Cc: Suren Baghdasaryan Cc: Quentin Perret Cc: Tejun Heo Cc: Johannes Weiner Cc: Ingo Molnar Cc: Juri Lelli Cc: Vincent Guittot Cc: "Rafael J. Wysocki" Cc: Dietmar Eggemann Cc: Daniel Bristot de Oliveira Cc: Valentin Schneider Cc: Mark Rutland Cc: kernel-team@android.com --->8 Will Deacon (20): arm64: cpuinfo: Split AArch32 registers out into a separate struct arm64: Allow mismatched 32-bit EL0 support KVM: arm64: Kill 32-bit vCPUs on systems with mismatched EL0 support arm64: Kill 32-bit applications scheduled on 64-bit-only CPUs sched: Introduce task_cpu_possible_mask() to limit fallback rq selection cpuset: Don't use the cpu_possible_mask as a last resort for cgroup v1 cpuset: Honour task_cpu_possible_mask() in guarantee_online_cpus() cpuset: Cleanup cpuset_cpus_allowed_fallback() use in select_fallback_rq() sched: Reject CPU affinity changes based on task_cpu_possible_mask() sched: Introduce task_struct::user_cpus_ptr to track requested affinity sched: Split the guts of sched_setaffinity() into a helper function sched: Allow task CPU affinity to be restricted on asymmetric systems sched: Introduce dl_task_check_affinity() to check proposed affinity arm64: Implement task_cpu_possible_mask() arm64: exec: Adjust affinity for compat tasks with mismatched 32-bit EL0 arm64: Prevent offlining first CPU with 32-bit EL0 on mismatched system arm64: Advertise CPUs capable of running 32-bit applications in sysfs arm64: Hook up cmdline parameter to allow mismatched 32-bit EL0 arm64: Remove logic to kill 32-bit tasks on 64-bit-only cores Documentation: arm64: describe asymmetric 32-bit support .../ABI/testing/sysfs-devices-system-cpu | 9 + .../admin-guide/kernel-parameters.txt | 11 + Documentation/arm64/asymmetric-32bit.rst | 155 ++++++++ Documentation/arm64/index.rst | 1 + arch/arm64/include/asm/cpu.h | 44 +-- arch/arm64/include/asm/cpufeature.h | 8 +- arch/arm64/include/asm/elf.h | 6 +- arch/arm64/include/asm/mmu_context.h | 13 + arch/arm64/kernel/cpufeature.c | 232 +++++++++--- arch/arm64/kernel/cpuinfo.c | 53 +-- arch/arm64/kernel/process.c | 44 ++- arch/arm64/kvm/arm.c | 11 +- arch/arm64/tools/cpucaps | 3 +- include/linux/cpuset.h | 8 +- include/linux/mmu_context.h | 14 + include/linux/sched.h | 21 ++ init/init_task.c | 1 + kernel/cgroup/cpuset.c | 59 +-- kernel/fork.c | 2 + kernel/sched/core.c | 340 ++++++++++++++---- kernel/sched/sched.h | 1 + 21 files changed, 841 insertions(+), 195 deletions(-) create mode 100644 Documentation/arm64/asymmetric-32bit.rst