From nobody Sun Apr 5 22:53:18 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 88E2FC6FA82 for ; Tue, 13 Sep 2022 13:26:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232218AbiIMN0h (ORCPT ); Tue, 13 Sep 2022 09:26:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59586 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229803AbiIMN0f (ORCPT ); Tue, 13 Sep 2022 09:26:35 -0400 Received: from szxga02-in.huawei.com (szxga02-in.huawei.com [45.249.212.188]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 01984192B3 for ; Tue, 13 Sep 2022 06:26:34 -0700 (PDT) Received: from dggpemm500021.china.huawei.com (unknown [172.30.72.56]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4MRkfb3QqrzmV9H; Tue, 13 Sep 2022 21:22:47 +0800 (CST) Received: from dggpemm500001.china.huawei.com (7.185.36.107) by dggpemm500021.china.huawei.com (7.185.36.109) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Tue, 13 Sep 2022 21:26:31 +0800 Received: from localhost.localdomain.localdomain (10.175.113.25) by dggpemm500001.china.huawei.com (7.185.36.107) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Tue, 13 Sep 2022 21:26:31 +0800 From: Kefeng Wang To: Russell King , CC: Ard Biesheuvel , , Zhen Lei , Kefeng Wang Subject: [PATCH] ARM: mm: set readonly for MT_MEMORY_RO with ARM_LPAE Date: Tue, 13 Sep 2022 21:30:22 +0800 Message-ID: <20220913133022.145977-1-wangkefeng.wang@huawei.com> X-Mailer: git-send-email 2.35.3 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Originating-IP: [10.175.113.25] X-ClientProxiedBy: dggems701-chm.china.huawei.com (10.3.19.178) To dggpemm500001.china.huawei.com (7.185.36.107) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" MT_MEMORY_RO is introduced by commit 598f0a99fa8a ("ARM: 9210/1: Mark the FDT_FIXED sections as shareable"), which is a readonly memory type for FDT area, but there are some different between ARM_LPAE and non-ARM_LPAE, we need to setup PMD_SECT_AP2 and L_PMD_SECT_RDONLY for MT_MEMORY_RO when ARM_LAPE enabled. non-ARM_LPAE 0xff800000-0xffa00000 2M PGD KERNEL ro NX SHD ARM_LPAE 0xff800000-0xffc00000 4M PMD RW NX SHD ARM_LPAE+fix 0xff800000-0xffc00000 4M PMD ro NX SHD Fixes: 598f0a99fa8a ("ARM: 9210/1: Mark the FDT_FIXED sections as shareable= ") Signed-off-by: Kefeng Wang --- arch/arm/mm/mmu.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c index a49f0b9c0f75..b8d273651003 100644 --- a/arch/arm/mm/mmu.c +++ b/arch/arm/mm/mmu.c @@ -300,7 +300,11 @@ static struct mem_type mem_types[] __ro_after_init =3D= { .prot_pte =3D L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY | L_PTE_XN | L_PTE_RDONLY, .prot_l1 =3D PMD_TYPE_TABLE, +#ifndef CONFIG_ARM_LPAE .prot_sect =3D PMD_TYPE_SECT, +#else + .prot_sect =3D PMD_TYPE_SECT | L_PMD_SECT_RDONLY | PMD_SECT_AP2, +#endif .domain =3D DOMAIN_KERNEL, }, [MT_ROM] =3D { --=20 2.35.3