From patchwork Wed Jun 2 16:47:00 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Will Deacon X-Patchwork-Id: 12295317 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=-17.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,INCLUDES_PATCH,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, 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 9B39DC47092 for ; Wed, 2 Jun 2021 16:49:41 +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 730C0610C8 for ; Wed, 2 Jun 2021 16:49:41 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 730C0610C8 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=XkhF7HnUY/EehJFnZ3O0Pxsg3dSlQ2zGrbHwVQjMVpM=; b=T+gEJwJmcCXKpC thaloiMFG9VjX/8IsySZOw/hBqQcgPvdy15+i3zhLGKnI1ZRFnJQROhWjopa6Nz6sn51ZRTXrtzaZ Ddo4AqePc/0oAGuqj/wElkMRTx4kpaFPtNJ0ZONqyNH0oJ0tYzA6xu60NLFt80SkwUWsPP1n/2U7j eixs5d9KoC3BnlgvfBOJUSvslEuA5BVpN7NwQwyYk/LL+c1105mkkf2DaajCZxICNBuK3D41SdKOJ o2QemeaaLpoKDcqyxldrU/f27Wm7kEj10jtq7Cmc4CjKU6qcutxJ+E5D9N1dL6QnH7jgAplLecrmH D96ntOLHNln5DQ1zRthg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1loU1p-005Ezp-BG; Wed, 02 Jun 2021 16:47:37 +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 1loU1j-005EyM-K8 for linux-arm-kernel@lists.infradead.org; Wed, 02 Jun 2021 16:47:33 +0000 Received: by mail.kernel.org (Postfix) with ESMTPSA id D76B860FEE; Wed, 2 Jun 2021 16:47:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1622652451; bh=mHZIffR0DdrLEhnAmRnaMyrF2+gcxZ3dunFWbH0rWDA=; h=From:To:Cc:Subject:Date:From; b=X8O9G15WXlPUIbsCT12lVtm4RjLJ4zKx9HySsNAGCx6+dztpHWyFTf/EZyKPUT9jW K90QcC5TS/hhmiLFDbOJWHiGfdP9LVfnIXh8ziBf1Av26VhRnvfxuUM06+uv0ieNJr /WemsMqoaEOhMwMwj9CAcjAXMi0vLjNAJnvl3JM12+T9U7ID41hxxmKjI5ikT/tzWU g1mUG0tVkszEO0DHYLJC81eCOAoXQLmnGFZZUhqSGbaETa0WZ1SUwvOWPnTHUF5Ctp po8TcQcjPb2FtI/eieTLbrNVfcRJMfPoFDpxUd2FDKMdHny3KKiJef0ehjy9VzpcBk qNbIRY+j3Jg8g== 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 , kernel-team@android.com Subject: [PATCH v8 00/19] Add support for 32-bit tasks on asymmetric AArch32 systems Date: Wed, 2 Jun 2021 17:47:00 +0100 Message-Id: <20210602164719.31777-1-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-20210602_094731_731999_BBB782FA X-CRM114-Status: GOOD ( 12.40 ) 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 again folks, Here is v8 of the asymmetric 32-bit support patches that I previously posted here: 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 There was also a nice LWN writeup in case you've forgotten what this is about: https://lwn.net/Articles/838339/ Changes since v7 include: * Dropped the scheduler migration fix, as Valentin has kindly fixed this separately in -tip: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?h=sched/core&id=475ea6c60279e9f2ddf7e4cf2648cd8ae0608361 * Dropped the freezer/ttwu changes, as Peter is rewriting that: https://lore.kernel.org/r/YLYZv4v68OnAlx+3@hirez.programming.kicks-ass.net * Reworded documentation wrt KVM behaviour [maz] * Tidied up control flow in cpuset_cpus_allowed_fallback() [peterz] * Fixed interaction with migrate_disable() [peterz] * Don't ignore allocation failure in restrict_cpus_allowed_ptr() [peterz] * Reordered the patches to put arm64 prep work first * 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: kernel-team@android.com --->8 Will Deacon (19): 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() 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 task_cpus_dl_admissible() 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 | 227 +++++++++--- 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 | 3 +- include/linux/mmu_context.h | 11 + include/linux/sched.h | 21 ++ init/init_task.c | 1 + kernel/cgroup/cpuset.c | 49 ++- kernel/fork.c | 2 + kernel/sched/core.c | 334 ++++++++++++++---- kernel/sched/sched.h | 1 + 21 files changed, 819 insertions(+), 188 deletions(-) create mode 100644 Documentation/arm64/asymmetric-32bit.rst