From mboxrd@z Thu Jan 1 00:00:00 1970 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=-13.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,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 E069DC4742C for ; Fri, 13 Nov 2020 09:38:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A5C0822275 for ; Fri, 13 Nov 2020 09:38:28 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="xzjwM4a7" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726611AbgKMJi1 (ORCPT ); Fri, 13 Nov 2020 04:38:27 -0500 Received: from mail.kernel.org ([198.145.29.99]:50960 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726583AbgKMJiZ (ORCPT ); Fri, 13 Nov 2020 04:38:25 -0500 Received: from localhost.localdomain (236.31.169.217.in-addr.arpa [217.169.31.236]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 5D00522269; Fri, 13 Nov 2020 09:38:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1605260304; bh=seIJw9UveGD+JXVjl9bulJYz+jLKQSADhKuk/0LEM5k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=xzjwM4a75CVF2WZfMZy0bKIwWYKSONvNjiJyRD/EptTxwYvoHQqSwdjH25NiMrEJk ec7+fQK8JplZg5V+23bwzqAJGvTpLTZjuYL/R3pn0pmIFgQhES1lh4/+81pLErj3mV XHdo5lwA0Eh+4KjOizWFisWnuvmN2M/rjSI4pBM8= 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 , Li Zefan , Johannes Weiner , Ingo Molnar , Juri Lelli , Vincent Guittot , kernel-team@android.com Subject: [PATCH v3 13/14] arm64: Implement arch_cpu_allowed_mask() Date: Fri, 13 Nov 2020 09:37:18 +0000 Message-Id: <20201113093720.21106-14-will@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20201113093720.21106-1-will@kernel.org> References: <20201113093720.21106-1-will@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-arch@vger.kernel.org Provide an implementation of arch_cpu_allowed_mask() so that we can prevent 64-bit-only cores being added to the 'cpus_mask' for compat tasks on systems with mismatched 32-bit support at EL0, Signed-off-by: Will Deacon --- arch/arm64/include/asm/mmu_context.h | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/arch/arm64/include/asm/mmu_context.h b/arch/arm64/include/asm/mmu_context.h index 0672236e1aea..54fc469e7db9 100644 --- a/arch/arm64/include/asm/mmu_context.h +++ b/arch/arm64/include/asm/mmu_context.h @@ -251,6 +251,18 @@ switch_mm(struct mm_struct *prev, struct mm_struct *next, #define deactivate_mm(tsk,mm) do { } while (0) #define activate_mm(prev,next) switch_mm(prev, next, current) +static inline const struct cpumask *arch_cpu_allowed_mask(struct task_struct *p) +{ + if (!static_branch_unlikely(&arm64_mismatched_32bit_el0)) + return cpu_possible_mask; + + if (!is_compat_thread(task_thread_info(p))) + return cpu_possible_mask; + + return system_32bit_el0_cpumask(); +} +#define arch_cpu_allowed_mask arch_cpu_allowed_mask + void verify_cpu_asid_bits(void); void post_ttbr_update_workaround(void); -- 2.29.2.299.gdc1121823c-goog