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=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 39B9CC2B9F8 for ; Tue, 25 May 2021 15:16:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 197186142F for ; Tue, 25 May 2021 15:16:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232364AbhEYPST (ORCPT ); Tue, 25 May 2021 11:18:19 -0400 Received: from mail.kernel.org ([198.145.29.99]:54936 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232173AbhEYPRt (ORCPT ); Tue, 25 May 2021 11:17:49 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 4AE7761436; Tue, 25 May 2021 15:16:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1621955779; bh=2Tu/2JiXMKcPPPKmdOfa8s5PZpHuaTBt8RxTqRmrXV8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=QjROUIYpRep4wk4NrxWkdXd9BKzpYBLggho3ynNEsiA7QOFn+2BsNSDSt8Bc5rRgn U5zTEKARsOYWhGzW3bhHU7WspRpp+kK2IqA6p1yJsw702ImoI2d3jJMdmkNxOl77yc IAhB3lCf++kFf7063e3+g3HG9eDGc+D0UV020MhLWq8f7c+Yu19aVGWdOqux6/eRYO MyGaQg3+xLJ0KdKBO1acQVNRCnI8XDemC3ZWXStjSygTMMpY0TZeSUq9W4yA/26Uh/ Y/7oQAGTeOv+uz2swF+3qxWd6Pzww7VjOofJqK2qbl12lu+P4s/VoAfe3LinlsRGFM WqWT2wKoXmPVw== 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 , kernel-team@android.com Subject: [PATCH v7 17/22] arm64: Implement task_cpu_possible_mask() Date: Tue, 25 May 2021 16:14:27 +0100 Message-Id: <20210525151432.16875-18-will@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210525151432.16875-1-will@kernel.org> References: <20210525151432.16875-1-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 task_cpu_possible_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, Reviewed-by: Catalin Marinas Signed-off-by: Will Deacon --- arch/arm64/include/asm/mmu_context.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/arch/arm64/include/asm/mmu_context.h b/arch/arm64/include/asm/mmu_context.h index d3cef9133539..bb9b7510f334 100644 --- a/arch/arm64/include/asm/mmu_context.h +++ b/arch/arm64/include/asm/mmu_context.h @@ -231,6 +231,19 @@ switch_mm(struct mm_struct *prev, struct mm_struct *next, update_saved_ttbr0(tsk, next); } +static inline const struct cpumask * +task_cpu_possible_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 task_cpu_possible_mask task_cpu_possible_mask + void verify_cpu_asid_bits(void); void post_ttbr_update_workaround(void); -- 2.31.1.818.g46aad6cb9e-goog