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=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 309B7C4708F for ; Wed, 2 Jun 2021 16:48:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1AF69610A1 for ; Wed, 2 Jun 2021 16:48:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231535AbhFBQua (ORCPT ); Wed, 2 Jun 2021 12:50:30 -0400 Received: from mail.kernel.org ([198.145.29.99]:33602 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231359AbhFBQuV (ORCPT ); Wed, 2 Jun 2021 12:50:21 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 77F5161C2F; Wed, 2 Jun 2021 16:48:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1622652517; bh=rkpgk01BxQeVJ8G6y3SNtVUtRnUmwIAawJGBKo+zIbA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Bc+ZMb9101rEu+EjfCFthoAzvK+WgVyuZwUT3zMpPVEKM+55w/hZmrnpR+PcIHuvG oHf0VlWn49nw5V9haelTCXq9tG41s8eunw8omyxoepAn1QrGcPQc5CkIZRF+LhPDtW wrpMJKIzOsXQhzMpnGBEbsT13ttZyzZ6ltM/8c1f4uS643k0I91XOzzBx0xcBtSB4C ySAO9qKRr4nRQvoffauXqzlw2rGkYD0JqR6He0F3QgGMqgiAr+lP5dMn2fLXJ3ruqv nGA8p329ylzphy83K+EpRGQnDXf8w4uRMcSu1WfQk9RNIG/heDia0A+IkjbNb5StYR VjAmLYHFdna3w== 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 17/19] arm64: Hook up cmdline parameter to allow mismatched 32-bit EL0 Date: Wed, 2 Jun 2021 17:47:17 +0100 Message-Id: <20210602164719.31777-18-will@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210602164719.31777-1-will@kernel.org> References: <20210602164719.31777-1-will@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Allow systems with mismatched 32-bit support at EL0 to run 32-bit applications based on a new kernel parameter. Reviewed-by: Catalin Marinas Signed-off-by: Will Deacon --- Documentation/admin-guide/kernel-parameters.txt | 8 ++++++++ arch/arm64/kernel/cpufeature.c | 7 +++++++ 2 files changed, 15 insertions(+) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index cb89dbdedc46..a2e453919bb6 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -287,6 +287,14 @@ do not want to use tracing_snapshot_alloc() as it needs to be done where GFP_KERNEL allocations are allowed. + allow_mismatched_32bit_el0 [ARM64] + Allow execve() of 32-bit applications and setting of the + PER_LINUX32 personality on systems where only a strict + subset of the CPUs support 32-bit EL0. When this + parameter is present, the set of CPUs supporting 32-bit + EL0 is indicated by /sys/devices/system/cpu/aarch32_el0 + and hot-unplug operations may be restricted. + amd_iommu= [HW,X86-64] Pass parameters to the AMD IOMMU driver in the system. Possible values are: diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index 72efdc611b14..f2c97baa050f 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -1298,6 +1298,13 @@ const struct cpumask *system_32bit_el0_cpumask(void) return cpu_possible_mask; } +static int __init parse_32bit_el0_param(char *str) +{ + allow_mismatched_32bit_el0 = true; + return 0; +} +early_param("allow_mismatched_32bit_el0", parse_32bit_el0_param); + static ssize_t aarch32_el0_show(struct device *dev, struct device_attribute *attr, char *buf) { -- 2.32.0.rc0.204.g9fa02ecfa5-goog 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=-17.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,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 C5CA8C47083 for ; Wed, 2 Jun 2021 17:01:14 +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 962CC61C83 for ; Wed, 2 Jun 2021 17:01:14 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 962CC61C83 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:References:In-Reply-To: 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: List-Owner; bh=SBa3t4SFs3Eh2lW23/lA/6khndSEWbVmhCIAHNAWnhs=; b=t2LH4lE2cVzTEc 0M+A6ySn9C6VNOHN5EYzZPvWZTzEjEBwYGNPdEnlt1KBj/rIzAkeEmckjDNfgUEOcTsfNVRLWBfgf mp4w2eWxfVPWDbhv2vbyv7ziAzYBIgbbEGZwlNJ2Xlaph2z4LGsNk63RwYZvh/3qDrSL1CQG9UmuQ NHcqpV7ualuaYjmVd572y7jdVDCItXnDdYP4o2MVsp1Qlf7rELOwypGDQrkR1gp2CBVdLk1rZjFJI hzXJmyIrHBRs7QN/+CtTHyYVOoqzO+mN0821kZTyzP5eIs2H8P2vCQ6m8DWPwHNsEVZ3qOzPchX6o IEv6OvFs9k8vl0v6JHAw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1loUD1-005JvB-9f; Wed, 02 Jun 2021 16:59:12 +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 1loU2o-005FWI-8c for linux-arm-kernel@lists.infradead.org; Wed, 02 Jun 2021 16:48:39 +0000 Received: by mail.kernel.org (Postfix) with ESMTPSA id 77F5161C2F; Wed, 2 Jun 2021 16:48:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1622652517; bh=rkpgk01BxQeVJ8G6y3SNtVUtRnUmwIAawJGBKo+zIbA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Bc+ZMb9101rEu+EjfCFthoAzvK+WgVyuZwUT3zMpPVEKM+55w/hZmrnpR+PcIHuvG oHf0VlWn49nw5V9haelTCXq9tG41s8eunw8omyxoepAn1QrGcPQc5CkIZRF+LhPDtW wrpMJKIzOsXQhzMpnGBEbsT13ttZyzZ6ltM/8c1f4uS643k0I91XOzzBx0xcBtSB4C ySAO9qKRr4nRQvoffauXqzlw2rGkYD0JqR6He0F3QgGMqgiAr+lP5dMn2fLXJ3ruqv nGA8p329ylzphy83K+EpRGQnDXf8w4uRMcSu1WfQk9RNIG/heDia0A+IkjbNb5StYR VjAmLYHFdna3w== 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 17/19] arm64: Hook up cmdline parameter to allow mismatched 32-bit EL0 Date: Wed, 2 Jun 2021 17:47:17 +0100 Message-Id: <20210602164719.31777-18-will@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210602164719.31777-1-will@kernel.org> References: <20210602164719.31777-1-will@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210602_094838_361563_67EF8D7D X-CRM114-Status: GOOD ( 12.68 ) 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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Allow systems with mismatched 32-bit support at EL0 to run 32-bit applications based on a new kernel parameter. Reviewed-by: Catalin Marinas Signed-off-by: Will Deacon --- Documentation/admin-guide/kernel-parameters.txt | 8 ++++++++ arch/arm64/kernel/cpufeature.c | 7 +++++++ 2 files changed, 15 insertions(+) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index cb89dbdedc46..a2e453919bb6 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -287,6 +287,14 @@ do not want to use tracing_snapshot_alloc() as it needs to be done where GFP_KERNEL allocations are allowed. + allow_mismatched_32bit_el0 [ARM64] + Allow execve() of 32-bit applications and setting of the + PER_LINUX32 personality on systems where only a strict + subset of the CPUs support 32-bit EL0. When this + parameter is present, the set of CPUs supporting 32-bit + EL0 is indicated by /sys/devices/system/cpu/aarch32_el0 + and hot-unplug operations may be restricted. + amd_iommu= [HW,X86-64] Pass parameters to the AMD IOMMU driver in the system. Possible values are: diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index 72efdc611b14..f2c97baa050f 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -1298,6 +1298,13 @@ const struct cpumask *system_32bit_el0_cpumask(void) return cpu_possible_mask; } +static int __init parse_32bit_el0_param(char *str) +{ + allow_mismatched_32bit_el0 = true; + return 0; +} +early_param("allow_mismatched_32bit_el0", parse_32bit_el0_param); + static ssize_t aarch32_el0_show(struct device *dev, struct device_attribute *attr, char *buf) { -- 2.32.0.rc0.204.g9fa02ecfa5-goog _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel