From nobody Fri Oct 3 00:55:41 2025 Received: from NAM11-BN8-obe.outbound.protection.outlook.com (mail-bn8nam11on2126.outbound.protection.outlook.com [40.107.236.126]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0E310277008; Tue, 9 Sep 2025 03:35:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=40.107.236.126 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757388905; cv=fail; b=jYY5hN7YGE4OSg/2MfrlqWnYit2IegbgCMCtNRxQKXzESSLtSF9hZWjsQ/Uzz5VRle4AzDg0GhD23dj+YBG8WXPal7pqHvr01zzSiEkkUOcy2JB/0oXpy1ClSbsSKtTdbi31g/e9Ck+fLbSrKj+J5OuPeRqDR1sClvC19sdiqX8= ARC-Message-Signature: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757388905; c=relaxed/simple; bh=Lt50a9eIEq029pwcyrxzIFjwjmiqwp9ah/CSoJ0EAIs=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: Content-Type:MIME-Version; b=KZyLw8O2ujTeflAeWfmw4u7PQVn3IoB/N6Pkr3OOCpIHq0NjhUtlWeAi6RuGs7x9kc7BZSvCovuFTHEdUhq2dd+4GQ8R/Mq+EGwjuAGaKlj8RFRkfIOdqSjtxdK4VsE+9u+XW68zTvKLtj2uZECleYo85fpekn+zKdRuxJNQbXE= ARC-Authentication-Results: i=2; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=os.amperecomputing.com; spf=pass smtp.mailfrom=os.amperecomputing.com; dkim=pass (1024-bit key) header.d=os.amperecomputing.com header.i=@os.amperecomputing.com header.b=sIMwVqrh; arc=fail smtp.client-ip=40.107.236.126 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=os.amperecomputing.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=os.amperecomputing.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=os.amperecomputing.com header.i=@os.amperecomputing.com header.b="sIMwVqrh" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=S5MkWiD3sswb1zBfclFtfzSCdDge25NveJMzqKUG6N01zSsA9+TXvpDP5E5iCYYmrKdwSvqUa98LReXaGzMt12+6uPVfov46ijGUWLq/3yQ3hiNKDow6pY1qzBsqpsm2F1fUqD5ekbsunDoSYMUgekSppNeoQ/mOQqEfUDQyqsbKt3OtZfWmpj6ZJfoN3121hV2rZx0XL2agVHJ18PflnVdVYhPjaDw7cgmR+Sku859Dco6daI8MFvBFquEmVfV36ORj7mGyMZQIgU2tVxoNDml3CPh3Kk8+aSvc1SrxIwrSJBzUD/f4DuV/LbunXyQ6cArAeDFdTGoaoisSe19m+g== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=jYGOzG2F/Rr8iD5vT9877uN6NVosCYaAnGLlyJEn82I=; b=ZoYyZpE/D5cn7jQRpn22/nNbNp6eVPViuMAKRk71ANjq2DufOXtECmEC58Lxp+22XNDpXElsJQ4hgb4/lMKtJPXCDrPJjBRGp2J3i62hfYuQJ4wRuwD79gSoK66rd8QQm5ka28dcBd6H2IvAxLtGa3EDDkO/eTb4bzDMULXc25iC8CpmRkcYxqSiZElFAx+8ucsJVVc0oZ4GCyCLQep1LcBbUCQd1238tW/pfSlvdc8cZu6jN6l/yGUq4fMsHtk0hcUXHnHnfJYbZi5/ICcRKWCxk5p6l9kwkLwNlNGTbnyf7l1uknncQUAmaUZUBMT6AGVQr5VjVe2PVawQSFC/gg== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=os.amperecomputing.com; dmarc=pass action=none header.from=os.amperecomputing.com; dkim=pass header.d=os.amperecomputing.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=os.amperecomputing.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=jYGOzG2F/Rr8iD5vT9877uN6NVosCYaAnGLlyJEn82I=; b=sIMwVqrhmWNBGB0XN0P98GC+dCp/8ffJ4o7Km2CMpeU8Wr5oX68qE0dxnQwd3GksOPPRPqwOx2SnwpeDnRNkTpxv5IEGaP7qzE73nxYLxWuimpbGmIgr3Ved3KxY4GWfjHRVJRMu0KzH4HO3/c/YNRtODcTPi9WeG2qbJXcWFLU= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=os.amperecomputing.com; Received: from PH0PR01MB7975.prod.exchangelabs.com (2603:10b6:510:26d::15) by SJ2PR01MB8128.prod.exchangelabs.com (2603:10b6:a03:500::9) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9094.22; Tue, 9 Sep 2025 03:34:53 +0000 Received: from PH0PR01MB7975.prod.exchangelabs.com ([fe80::6926:a627:118e:8050]) by PH0PR01MB7975.prod.exchangelabs.com ([fe80::6926:a627:118e:8050%4]) with mapi id 15.20.9094.021; Tue, 9 Sep 2025 03:34:53 +0000 From: Huang Shijie To: catalin.marinas@arm.com, will@kernel.org Cc: patches@amperecomputing.com, cl@linux.com, Shubhang@os.amperecomputing.com, corbet@lwn.net, paulmck@kernel.org, akpm@linux-foundation.org, rostedt@goodmis.org, Neeraj.Upadhyay@amd.com, bp@alien8.de, ardb@kernel.org, anshuman.khandual@arm.com, suzuki.poulose@arm.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, rdunlap@infradead.org, Huang Shijie Subject: [PATCH v7 1/2] arm64: refactor the rodata=xxx Date: Tue, 9 Sep 2025 11:32:35 +0800 Message-Id: <20250909033236.4099-2-shijie@os.amperecomputing.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20250909033236.4099-1-shijie@os.amperecomputing.com> References: <20250909033236.4099-1-shijie@os.amperecomputing.com> Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: TYCP286CA0375.JPNP286.PROD.OUTLOOK.COM (2603:1096:405:79::11) To PH0PR01MB7975.prod.exchangelabs.com (2603:10b6:510:26d::15) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PH0PR01MB7975:EE_|SJ2PR01MB8128:EE_ X-MS-Office365-Filtering-Correlation-Id: 3a33f833-4612-42c4-6514-08ddef51c9ef X-MS-Exchange-AtpMessageProperties: SA X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|7416014|376014|52116014|1800799024|38350700014; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?H52nMteO4M08yNZxDL7NzpyxJoAA9Jv4CYytMiclfFYJDg+5yPux8JeQnsD8?= =?us-ascii?Q?WSUHADdPmqSQeEFNG3SzdNeAUXWAwI4jhDYICXz5JkDvibm4DgVh7vP1c0Jb?= =?us-ascii?Q?rVRETEtJ9K5BNKAVDL/zzH3AjKIFWmOqU2S1DmqAMu5bWE3+biG83g+ya6c9?= =?us-ascii?Q?lMK0WryG5MpLfnj5JCS5TuAVieZEEOFmwOqpV6A0y2l7NzcAtZWUHZtRlz6/?= =?us-ascii?Q?8XGJlM7zR8lJ96lthRlVFtmaT7YAI87cME2gSDlTB54DZbZNe+MtaaeS2KHu?= =?us-ascii?Q?pzN43zUp8HfXN3cjQ0VW3ninDk47LAChVIRJsYpbYDEGbQCQJL26PuBs87+5?= =?us-ascii?Q?sSaxAiNt78HTjqVgoaeLaGwkGS1laXnhqNLtaA0y87ofqDVSwfo7ONLR3jAn?= =?us-ascii?Q?1bzMFVEMS4nrXaHDZY4hvdPigEVDgpsSYJJ+KkM5OMwBdiiOENfQ/52aPXBt?= =?us-ascii?Q?E1BHRPYBLyxDe0AFJtzLOnBRUSA8tdMl5rwhEk3Kux4YplhE3jI02ACylbik?= =?us-ascii?Q?IhRtSZXs3Se/NQvZu5Zm1z+xHyM82XPoyNEj1elaWWVgyqkVI/gqLnZcBTuQ?= =?us-ascii?Q?ozpz4+BtI2nLzK710VD8DJF7FPuhMlF7Q79lBm67IQYXxoykQAyQfGghRc2v?= =?us-ascii?Q?47LHADtFaIGgXn1AVr+JWjmmLcZapNKoNg4+oCeuoTeUUuvulkRZ3vsDgB5p?= =?us-ascii?Q?P7lR4vLx/zwVyDHSyM/Bt9KB00ATh1I1Z7xpmpe254hivIpHfCjXInq6EV8T?= =?us-ascii?Q?vvkEKaDsehC17vK1P4eCvjtyhpNiDMpY6l5kSnktWb6TFvOtX5VyqcKBxFTG?= =?us-ascii?Q?BDYIE3/XOWqTdw1kLAB0MqXFluPmpzeHi/80a8FRn5DMDJW3fPLZm85RCDQt?= =?us-ascii?Q?BoO39JZ97kWg8kAgAOMljArre45UZCEMDhxqFfGxjd9MUORFXzYa8mzdZEKa?= =?us-ascii?Q?AAb9tbkM4M7HQdwgpqYB/K1nOqkxc8UvIBHwK2yQh3FYOGRFSWHWCWTao1FA?= =?us-ascii?Q?la4cjzsUIu3PSvlUQKquXf2NEl5gYHMAME9SDu0U8fCegctHjq5l/XmbPMN1?= =?us-ascii?Q?JiJg78jySonw32coTFEa9lWyMPfFwVm+aC96kP7p5pQLrNCRUxJ20BpWpp6t?= =?us-ascii?Q?kInj4GPD9dBaGGNUKR61pCKVW0enB/cZPWv6FQ0hOoGZulV5qWEFlUmaxBiH?= =?us-ascii?Q?BrB2p4IgJkRWS+0HtPOkImWO4KDHA4oyJxU68+wNGMIN+oiJVDinj2+7Sr+U?= =?us-ascii?Q?A7sAAbEcSOG2Esry+4iCVu9dMsxabcNyU8LyVr6TFbppSbCGtgvZWoFgCXSK?= =?us-ascii?Q?EkzeK/08e210Om/q5yc0/cYN7jo7paHH4FfUNGdfFNSqOGyxAkJAf5vVaUw3?= =?us-ascii?Q?GNE/fvDsJ+/B/Y0nkCCHzFXcgBOiWV6LTHhFsQEeWwhPerIANoPTm5pS7asY?= =?us-ascii?Q?W+JgXhNV0+z67aTWQJm+F39PnKeBX21r8SoS9HM7JOGrJPzTzfqN9A2NNpUI?= =?us-ascii?Q?4UQPJ3eUola2rWc=3D?= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:PH0PR01MB7975.prod.exchangelabs.com;PTR:;CAT:NONE;SFS:(13230040)(366016)(7416014)(376014)(52116014)(1800799024)(38350700014);DIR:OUT;SFP:1102; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?uM/CHA0N67YHS5drQRmYkdBaiVXDPFd/4RyHqPXfknO36AJYpKqAncUK3Mko?= =?us-ascii?Q?qydlJiLG/CLIvrYHVZQoYtUoC1DvNL6xQQLDWbjawTj/a1S/zWwndgGdYqal?= =?us-ascii?Q?vW04IdphC/hfupnCQ+k5eqsFPWIJkVhMvbpcMoRdFd9IcQH452zKlVJio7Wb?= =?us-ascii?Q?fGg7WEBLVSOKx0KhbjFRNMZi71xiCwF697jT30pyj9djoH4HyTeguQ34bYXM?= =?us-ascii?Q?A76BhqHjqtMYEmlSDJRBiUPt9QSOE/WsGOh1te39kD1sMya7mseyatl8xPo1?= =?us-ascii?Q?6MUOmbb7JNL6b2Ew1TO0nI0XB5bfqJbf06z5s6gE+KoIlUbQTE8mZ1yhzjvJ?= =?us-ascii?Q?Ik+VRYzITFGXceYjXNoQHgmmidQkH1Zsh8V7dDeGCYEC1+CSOG/dI2TjBg9x?= =?us-ascii?Q?kNwKoJW1mPHLOrw6xGL9axrJGtIizSmLkyT/zNkyliyANElUS6DQ7ZmgDH07?= =?us-ascii?Q?iDAA2Q1LqEeiUvCmXxJtseQGJ9X0WXnVny/ZP6QJZj3EAtIGXMndmP9b90XY?= =?us-ascii?Q?zMorRSxZcPzOAt3jElpbpDSzuPCjTZMJlctTz+cmyNYen0XIKPsu4qg2ooch?= =?us-ascii?Q?1LLQsi42cA+jYCwlSzmDtBtfkdiBgFS2W5PYHubS//ZD7MvcBkRvajRkFYbL?= =?us-ascii?Q?xHIYNaehUjr9ECNG+4KQUmKbYf9FaN/f5EklfbU9dPv5fDQPdnUuq76msTEs?= =?us-ascii?Q?wFi599ZyTBLfrbk7BnIm763rE5aTQKpz1YroOgvdBXlCXyu+Cj3riuktJowl?= =?us-ascii?Q?XD7FANXpPR8ke38IlJ6+UZM9axX/aqQhzO4E0ZbGjNHTa21bV8yMLZv63LXb?= =?us-ascii?Q?YBxFRIV05oFsyr0aScGpHQYkQOyXt9K1btXicRqAfzba7YivSnXABFD0/czw?= =?us-ascii?Q?BKpiS2xcdNzSpHrCP//a/d8x/JFtK/tQHfh6Q1IKoary7wI2NFAv/yahwC6i?= =?us-ascii?Q?QMQkSdkYAQn44Btqqde4sCxDrTuqsoMenD2AmxuS6faBnqPerNHusk6Ttfbs?= =?us-ascii?Q?WATOyLw4FfKbYdtXaPOS5Ybo2BGAxPdtfhvxanFmKy0Mlvtp4bB2/7wXptIy?= =?us-ascii?Q?Si8+hDjEE/AtJ49US/bLj5MjOZ6hISxEufHgwkynxgxWLM4ncj5Gpki9B1ko?= =?us-ascii?Q?wL+Nbyci42/73V0j5Go2THhaRSmXhNfKb1rY+cVGEnybMbw/3JsoQR4o8LUu?= =?us-ascii?Q?nMxOBzPhrqbGDItuyC1FIBZyC/YQRCiO3d2i3lHTeBd5/Cpqmhy+44CLkLC4?= =?us-ascii?Q?UhML7b0BROF0INRnHDZs0WE/eERP+FYqTNPp412x8bOvBHSPXGMSRV5UdMMx?= =?us-ascii?Q?y/kxqW9ka5NDG175BWm79HSTMDYt1B6UIOOjmM8piTwM3If7ZRtWBUJMr+UX?= =?us-ascii?Q?D9FhlCPs/fZU6sWzOi/8HwL1OTUhnHb9LRFWhgsxjq6glTIVF6JdXtfg//+v?= =?us-ascii?Q?zI76qqIBSOxzsuTbncu1qHsMdogzH4QRW4IaZTVO/z65zBeWBcjmnHPHoffz?= =?us-ascii?Q?MsAHO7TFhr0DpRfi7AhaDtrMc5L5f22H/kRkAgxKmeDjoaVN5X4W2M2EFy8o?= =?us-ascii?Q?oMjVOTLzKoO4kKzc8DEQfQ1pHTqJWbZPL5hEx9bJoYdDXRwILZNDH/ssDr9C?= =?us-ascii?Q?MGfVkYFRB8nNtbMaNROdjoM=3D?= X-OriginatorOrg: os.amperecomputing.com X-MS-Exchange-CrossTenant-Network-Message-Id: 3a33f833-4612-42c4-6514-08ddef51c9ef X-MS-Exchange-CrossTenant-AuthSource: PH0PR01MB7975.prod.exchangelabs.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Sep 2025 03:34:32.7237 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 3bc2b170-fd94-476d-b0ce-4229bdc904a7 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: ZTV48RIGPQU4VJ5cNfUxi2FqoH1vkWavaJuL4awcHp3g+CBBWkyXT0VeXrnzcgJMUl1OmiMAf9dUMxGfx/QSHQUFcp+bqkS++f18fx530320+XpXfcHaZ8oRCEftuxDy X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ2PR01MB8128 Content-Type: text/plain; charset="utf-8" As per admin guide documentation, "rodata=3Don" should be the default on platforms. Documentation/admin-guide/kernel-parameters.txt describes these options as rodata=3D [KNL,EARLY] on Mark read-only kernel memory as read-only (default). off Leave read-only kernel memory writable for debugging. full Mark read-only kernel memory and aliases as read-only [arm64] But on arm64 platform, RODATA_FULL_DEFAULT_ENABLED is enabled by default, so "rodata=3Dfull" is the default instead. This patch implements the following changes: - Make "rodata=3Don" behaviour same as the original "rodata=3Dfull". This keeps align with the x86. - Make "rodata=3Dnoalias" (new) behaviour same as the original "rodata=3Do= n" - Drop the original "rodata=3Dfull" After this patch, the "rodata=3Don" will be the default on arm64 platform as well. Different rodata options may have different performance, so record more detail information here: rodata=3Don (default) This applies read-only attributes to VM areas and to the linear alias of the backing pages as well. This prevents code or read- only data from being modified (inadvertently or intentionally), via another mapping for the same memory page. But this might cause linear map region to be mapped down to base pages, which may adversely affect performance in some cases. rodata=3Doff This provides more block mappings and contiguous hints for linear map region which would minimize TLB footprint. This also leaves read-only kernel memory writable for debugging. rodata=3Dnoalias This provides more block mappings and contiguous hints for linear map region which would minimize TLB footprint. This leaves the linear alias of read-only mappings in the vmalloc space writeable, making them susceptible to inadvertent modification by software. Signed-off-by: Huang Shijie Reviewed-by: Anshuman Khandual --- Documentation/admin-guide/kernel-parameters.txt | 5 +++-- arch/arm64/include/asm/setup.h | 4 ++-- 2 files changed, 5 insertions(+), 4 deletions(-) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentatio= n/admin-guide/kernel-parameters.txt index db84a629f7b1..138e0db5af64 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -6418,8 +6418,9 @@ rodata=3D [KNL,EARLY] on Mark read-only kernel memory as read-only (default). off Leave read-only kernel memory writable for debugging. - full Mark read-only kernel memory and aliases as read-only - [arm64] + noalias Mark read-only kernel memory as read-only but retain + writable aliases in the direct map for regions outside + of the kernel image. [arm64] =20 rockchip.usb_uart [EARLY] diff --git a/arch/arm64/include/asm/setup.h b/arch/arm64/include/asm/setup.h index ba269a7a3201..3d96dde4d214 100644 --- a/arch/arm64/include/asm/setup.h +++ b/arch/arm64/include/asm/setup.h @@ -21,7 +21,7 @@ static inline bool arch_parse_debug_rodata(char *arg) if (!arg) return false; =20 - if (!strcmp(arg, "full")) { + if (!strcmp(arg, "on")) { rodata_enabled =3D rodata_full =3D true; return true; } @@ -31,7 +31,7 @@ static inline bool arch_parse_debug_rodata(char *arg) return true; } =20 - if (!strcmp(arg, "on")) { + if (!strcmp(arg, "noalias")) { rodata_enabled =3D true; rodata_full =3D false; return true; --=20 2.40.1 From nobody Fri Oct 3 00:55:41 2025 Received: from NAM11-BN8-obe.outbound.protection.outlook.com (mail-bn8nam11on2126.outbound.protection.outlook.com [40.107.236.126]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2145E2741CB; Tue, 9 Sep 2025 03:35:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=40.107.236.126 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757388903; cv=fail; b=lOaz03IKUNVVQD7pMVatkpJBm5j1vJr0ShRNrIhVH2zsAcQIx2KTSGXPMh7xbkBxLty+LnfEybNlbjODR6zOoRN+SfxL/7CkzMIqgOa+0+iX96+hmEQ9qT3XA9DTkD44r9cs3C5x8KYAO3tiQ16UmYSUgwm2s0y5/ahz17U5BE4= ARC-Message-Signature: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757388903; c=relaxed/simple; bh=u7V5aBHJPM6BZbpHGV1mNexG+GFxQZ7gAcY/J1k2SSs=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: Content-Type:MIME-Version; b=VjqJf/KVFlCjaa72vGfhxoVX5gBF0J3fUWedgqfsnuQqRFL2xES70Yq+fBp1DcGlaSfCMod+iwU/xZLaUb0p9U4TR01jYLlGFoCDf0UtzoUYWsSP56nyu8WdAln8U++s7LrrFKD0agS4tczVVUoL74Zc54VwfZS2gP4esywK4FE= ARC-Authentication-Results: i=2; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=os.amperecomputing.com; spf=pass smtp.mailfrom=os.amperecomputing.com; dkim=pass (1024-bit key) header.d=os.amperecomputing.com header.i=@os.amperecomputing.com header.b=CE1/j+8/; arc=fail smtp.client-ip=40.107.236.126 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=os.amperecomputing.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=os.amperecomputing.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=os.amperecomputing.com header.i=@os.amperecomputing.com header.b="CE1/j+8/" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=bl6q4amhPMz6AXEbBMneyiWiTsUpiJjlHOiqbegsLEkBazn9aX1kmKiM11h/Ry1SccvQSbzmoeEpqwpPhRfJTaJCSSt9bSx0nf5fb2pA6pjmccow5CVhz/Zr/dTBfmQsEtQaFHWydaiAEnqjdDaH8UL7n6FW75DY/oL0ujL1NGH9yNAq+/v76234GYVG8WP5XUTpYY4Fj9eLi6g4qpiP3jueDr9xanadEgNmovcGXOCbW5WV7X6aflVb20c8PnIE+1nntr/LYW6Bqj2TrK2+umbs29MShxU324DmLJ2OsEG7rnLPRSBMnp/OaB8xluJc2/7iqaRN2br7CFvMeZeI4A== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=G4/oHXOcXbP+Q5Oxa3dVeBvgo9QjyjKeJarb0yfV16Q=; b=omJy5To3ZYg2IQieCBXQWDtdEcnIe0MO5tpwvMzdMr9TkJR2ShfqSd4IZc4i3qu4wFyP94WKmM8CnoV4IYyG0EV0hHErHKU7op9VI+hvNx6oY4uIR/1uUDyJehnpti6ZO3e61e6AsceUDYzkwv2BDNR2vAh3gAuPSi4tMTxQDvLk7dpSm9y1KEsgF9CiOaH95DvF5Jd2WhHaFhIeA9SvcbVtDyCzpXxOsSZrMlyoBWZqEh9ouYsZU9NYEjdR4YR+q1ZpZBt3575TTaWXLyOmb6iYYNHh5cxEKF9avC+tRWNXIzEBlwZB+0kuJCoJi1SsYM7KYC1DlpS9G1hnIkxfBA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=os.amperecomputing.com; dmarc=pass action=none header.from=os.amperecomputing.com; dkim=pass header.d=os.amperecomputing.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=os.amperecomputing.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=G4/oHXOcXbP+Q5Oxa3dVeBvgo9QjyjKeJarb0yfV16Q=; b=CE1/j+8/l+hLSf2hJL4uutb+jqEI1UQ/AUHu22/eycFEaO8h2EengB4L/gC7PByY5/xULLOP7epJuJDkO6yi4vrfEk2qRpN57D/QRPsymYMCRcQwoB4EsqERgSKVOTLN8WIwj3SNyXwsRB5hKA/SBI8NVNSKsxzVxqRks2SpHmU= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=os.amperecomputing.com; Received: from PH0PR01MB7975.prod.exchangelabs.com (2603:10b6:510:26d::15) by SJ2PR01MB8128.prod.exchangelabs.com (2603:10b6:a03:500::9) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9094.22; Tue, 9 Sep 2025 03:34:55 +0000 Received: from PH0PR01MB7975.prod.exchangelabs.com ([fe80::6926:a627:118e:8050]) by PH0PR01MB7975.prod.exchangelabs.com ([fe80::6926:a627:118e:8050%4]) with mapi id 15.20.9094.021; Tue, 9 Sep 2025 03:34:53 +0000 From: Huang Shijie To: catalin.marinas@arm.com, will@kernel.org Cc: patches@amperecomputing.com, cl@linux.com, Shubhang@os.amperecomputing.com, corbet@lwn.net, paulmck@kernel.org, akpm@linux-foundation.org, rostedt@goodmis.org, Neeraj.Upadhyay@amd.com, bp@alien8.de, ardb@kernel.org, anshuman.khandual@arm.com, suzuki.poulose@arm.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, rdunlap@infradead.org, Huang Shijie Subject: [PATCH v7 2/2] arm64/Kconfig: Remove CONFIG_RODATA_FULL_DEFAULT_ENABLED Date: Tue, 9 Sep 2025 11:32:36 +0800 Message-Id: <20250909033236.4099-3-shijie@os.amperecomputing.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20250909033236.4099-1-shijie@os.amperecomputing.com> References: <20250909033236.4099-1-shijie@os.amperecomputing.com> Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: TYCP286CA0375.JPNP286.PROD.OUTLOOK.COM (2603:1096:405:79::11) To PH0PR01MB7975.prod.exchangelabs.com (2603:10b6:510:26d::15) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PH0PR01MB7975:EE_|SJ2PR01MB8128:EE_ X-MS-Office365-Filtering-Correlation-Id: 583a7418-7f3d-49f9-40ff-08ddef51cfa4 X-MS-Exchange-AtpMessageProperties: SA X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|7416014|376014|52116014|1800799024|38350700014; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?IknolHLTRzfIavekdOl2G/vd6Q/xRGLBdPhYblhZjtFUXs7o5GLCnJRu+o9Q?= =?us-ascii?Q?fULAXk1nnTHLACyAbdUvNnjXYoadLloKUABs49vslXFkWJCvCFl+QDRIUfrv?= =?us-ascii?Q?Ga617X+q/zPb1jzduNJ2+gboGuQQLeVZTbiA1SCct7rUjUVBGcmB5fYCuAXn?= =?us-ascii?Q?SeRqolDXJQOfqJMnIYZNqwABnW3J1hvgBunOzogrs6DJkElhfL+9XhhbftYt?= =?us-ascii?Q?ABy2MwRx7+NjiWz74twA+Z7xo6wcWVGuuCvgR/NKnsSvwk/mF9biOlYsu9rt?= =?us-ascii?Q?yjEgrnfusBeESqe02yVXOaTpQmwtoOWvoypT4u27nMWRMubIVphU5bHx16e/?= =?us-ascii?Q?KH9vW42Qsg3EMzNFaHLH4h32RlCLKQVNKMj6DDLNgm9KmZza2ZB3zBsgR6DX?= =?us-ascii?Q?EfLWp0EEqc5ZvG5qrgm8XND1gb6c+ojlEpPleezrqw+MT8NMxKUaBmDrQ0qF?= =?us-ascii?Q?Ra7bjzk5xGQL6gSwHY7+joKelFTnZBR4y31vupCbEGVWq8KQi+llVQAsC7jp?= =?us-ascii?Q?KOTe5QT/1qLh6dmHAI/e9NKX5YsDdS39RZMqbLyC3p8LqBibNCSBJbW8thXm?= =?us-ascii?Q?/TF6W7WC1ESd5/Sg4PNA8yV+hOPspOnRHZyvZlzVDLF6XJ7lU02C/HEoleV6?= =?us-ascii?Q?YjPqu4tXjZwcahO01mfsLMieRl7loOlEEbs7Ukks6q5Nh/P40+NiclVvP775?= =?us-ascii?Q?7WwgmrzURytBz5/QhqCX75GtNFIbSQFmZVbnrdvNzDmusklZh3fdv7/PX6DN?= =?us-ascii?Q?MJ/yJWpgHxBBzAZ3QwPRxRBGxlBwKp+SstPVMTNUFuvdwDQ02aIr6FAyAFXm?= =?us-ascii?Q?Zw8X9IIk71r5926G1q8L4w+IHrrlrYaqgqorZf8I4fD+fOgJrxmmfzm2T/Qp?= =?us-ascii?Q?bWFrR/8fWtotrAuTDQ3RZJ5iYaIxv5fYeMs+oeTMeaS1u8vj69xFHGxxzvlw?= =?us-ascii?Q?UXHBPlRzp5Plh8AEL6iJOWgrRRTM/SnViA2ntrPaIEEw91RrZt126luhd2I1?= =?us-ascii?Q?+YYDVkwX2jFxjBxpeMqAY1HnQXy/vcjkZOE9myP+IacgvWfB6hyVIM/wUL/H?= =?us-ascii?Q?2cXYMR2XdJhyg/nSdDLQbXj4q26/klwFYarEcYJjZe7vKE337wsk46ijEB5q?= =?us-ascii?Q?cKft/zo6gBahfdGy6IZa3mgbPqXPN7zpYQ3ig/XY+EBUoJuu0mKL/XTx3Ehl?= =?us-ascii?Q?93DLdyDrLZ14CEPydn4EIktJWm9pRORTwr8NwB12pSY/jx9e1n93zqwo1LVS?= =?us-ascii?Q?QmmrwDPSS3dfCyGvRADUIy0YvxOu/hKsgafYKLa38zuDgFqlTzHefaKRN2uP?= =?us-ascii?Q?UTGQNrNPFATWyEaoyhARp0ZmrjYDJF20B/C4KGi4SAE01uViCni3rXAyRqQN?= =?us-ascii?Q?YV49PELsCLpQtA1qmV4BIt8rUHmCfd3S/KFA5zzKDiSNtP09SZU0NJz/qMsa?= =?us-ascii?Q?K6HesEFUZpnTeTZ5KZf4EmkJsGmyFnS/8MeyHsMrK2C+bZQ9DwgAkXYrUWPE?= =?us-ascii?Q?CY9swm9uf3ei5pQ=3D?= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:PH0PR01MB7975.prod.exchangelabs.com;PTR:;CAT:NONE;SFS:(13230040)(366016)(7416014)(376014)(52116014)(1800799024)(38350700014);DIR:OUT;SFP:1102; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?Z7w+d+B61O75iJqSV7IR2dHKxXy0RLxpzhcUWTCYU+xkmf6ne0lAJe5iN3h6?= =?us-ascii?Q?xO+ujOJiS+lM4yPBBbXeDp7gkXe698mJFhibZfsxKvNMJmxgyCJ01bVQvKhN?= =?us-ascii?Q?WsOV3BYSUDVhI5t9JRiTKKuU9H4LEfTtR/SwwTVyZB55jWXf5ibxbcIL1UsF?= =?us-ascii?Q?KcZQ3sctKiuZmtFEU7XFdHPdEdf7Z0p8BDhbU1OFkHMqixadN5RjU8t7uSnL?= =?us-ascii?Q?Ebm0bMB1lJazxr3xs9OX90tfkYejybDiFHQ88TKLoZnpZ4ic6viervwOKlpr?= =?us-ascii?Q?FQ2CFeT01q+zFrovjpw3QImsmjziJZotsk7zuFkbOfZcyNvQuMApLbi344rl?= =?us-ascii?Q?pE0Em4H9qC+Oy344wskiTVBSA4Ocm9eJ5GzBXFD/XxPIBBFbE/BL6MtXTD+x?= =?us-ascii?Q?rfp6mQ6uc3zZeZagb72pdNtYdQnZPlkGkUQWXwnAUQzKRIeYwsXa3tyYGKYA?= =?us-ascii?Q?pIbtf6r8Mqn8Z8j0yFeMJ8x/xLjBUf8AmecV0ixrHvtneIQkS8IsdPHyni+t?= =?us-ascii?Q?kr1g9ttOyTLOwnSc7u5IOK07NzA7VwWII9c152nj9iZGK9vA5HRfhgl+BkNZ?= =?us-ascii?Q?6HgTXW8Nhq0qSw0wXwjkhCLiEmfdYSiDVmhQCqukBgWCZjhstrnEwjeNKdZd?= =?us-ascii?Q?PrO1eY8f3NnMqP0K1bMRctwbfUSehr34r2a5VDIzrZCepvjMfQOpJw2Qm2jE?= =?us-ascii?Q?cma5pT+sqv01GndoUPVgjHqBt1ElPD4KBXjewGDt0TJXNHbcwRqScLjVJtON?= =?us-ascii?Q?uZo+ErXDcAedd3afs0UJ9s4XNo1FasgsJwibGX6Dki8/GfjVuxRsJnPlLA62?= =?us-ascii?Q?tbna4aML3l7GzJC2mlNp4LiF+EQOdZ6EpOE2OsdghfKbtQOXreCM0Rz7AxDv?= =?us-ascii?Q?qkbd8BQop0NxLcWUHRydfuOCo9GEzflvdm9+ngWsV65kYG+nTTtiFNVOsI33?= =?us-ascii?Q?pgOJh0bDsDPESsoOGCPtGZAgtpMRRL4obwDefU+bLq3Pi/HkWa1DWjfnlPan?= =?us-ascii?Q?1tIaTOHaHNycdajN8/MkFOI9LlwkqcOiDHWiYbgea/UhpXWCnPs7rkQSSt2H?= =?us-ascii?Q?9ajw2xXJnzgFDx1dcdVD8SDxXAGfDdkq6IBBJZGnvCKJoVScQ+agfCe76GY4?= =?us-ascii?Q?0cGQqsjAQto4uCdLufRY+1+5R+haB1io2PEUpHEo4tpQD57BYVbofRre9Azw?= =?us-ascii?Q?YsB4r1LdGiGNigqzwGvrvrpigLlJIdMh/h65UAJ1Vl+yabxsHdP9haxGT0h9?= =?us-ascii?Q?5MhZuD1sgxOzRow4kOCwRcxOnW8RJt0uxiuISYMNkyJGctPgdVUlFjFJJU16?= =?us-ascii?Q?NzW+r/pCjlVx3KsWJIjWhZ8H1z0IJmmRp1to7KtdAsjpnFZLPmk9mUmm+Hbc?= =?us-ascii?Q?G7Ro9LA3LoponMASuPH8fFsmaGS/xjHoRIbjpU3PCCDbdqkOkIlbUNgItKJ6?= =?us-ascii?Q?PyvwwQn5OkiIiOyyAVJmND9jcS51ptPgu5NCI4G/SZjRB7bdMAmO6m8ivccs?= =?us-ascii?Q?xDNyzwrPXKl5O3JxzpZAiO2Ktu9AG8RWXebRtMBpVV77iXD8myaiWc4Z2+UP?= =?us-ascii?Q?L7iPPJiBVAzDzSkrk/4ZD5Glvm++zfGgaA2MXxvGOQfWT+DS8/Lfr8Zh9/sW?= =?us-ascii?Q?mTqYAhNtAlQHnZQjzpMhXwI=3D?= X-OriginatorOrg: os.amperecomputing.com X-MS-Exchange-CrossTenant-Network-Message-Id: 583a7418-7f3d-49f9-40ff-08ddef51cfa4 X-MS-Exchange-CrossTenant-AuthSource: PH0PR01MB7975.prod.exchangelabs.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Sep 2025 03:34:41.5097 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 3bc2b170-fd94-476d-b0ce-4229bdc904a7 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: 0SRn+lBcUtIWjj9ZrhCENp7Gim7lilPNxG7YVviaKs25ewqwEa7pFhBk/llvDJM+GQcyhKu26Km3dkuq65NjsysBZQGoh6LgKQI2tD0Ql7j+L2xI7nuW55rnivBIbVmG X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ2PR01MB8128 Content-Type: text/plain; charset="utf-8" After patch "arm64: refacotr the rodata=3Dxxx", the "rodata=3Don" becomes the default. ...................................... if (!strcmp(arg, "on")) { rodata_enabled =3D rodata_full =3D true; return true; } ...................................... The rodata_full is always "true" via "rodata=3Don" and does not depend on the config RODATA_FULL_DEFAULT_ENABLED anymore, so it can be dropped. Reviewed-by: Anshuman Khandual Signed-off-by: Huang Shijie --- arch/arm64/Kconfig | 14 -------------- arch/arm64/mm/pageattr.c | 2 +- 2 files changed, 1 insertion(+), 15 deletions(-) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 1bd9c364da6e..5d15bcd0702e 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -1673,20 +1673,6 @@ config MITIGATE_SPECTRE_BRANCH_HISTORY When taking an exception from user-space, a sequence of branches or a firmware call overwrites the branch history. =20 -config RODATA_FULL_DEFAULT_ENABLED - bool "Apply r/o permissions of VM areas also to their linear aliases" - default y - help - Apply read-only attributes of VM areas to the linear alias of - the backing pages as well. This prevents code or read-only data - from being modified (inadvertently or intentionally) via another - mapping of the same memory page. This additional enhancement can - be turned off at runtime by passing rodata=3D[off|on] (and turned on - with rodata=3Dfull if this option is set to 'n') - - This requires the linear region to be mapped down to pages, - which may adversely affect performance in some cases. - config ARM64_SW_TTBR0_PAN bool "Emulate Privileged Access Never using TTBR0_EL1 switching" depends on !KCSAN diff --git a/arch/arm64/mm/pageattr.c b/arch/arm64/mm/pageattr.c index 04d4a8f676db..667aff1efe49 100644 --- a/arch/arm64/mm/pageattr.c +++ b/arch/arm64/mm/pageattr.c @@ -20,7 +20,7 @@ struct page_change_data { pgprot_t clear_mask; }; =20 -bool rodata_full __ro_after_init =3D IS_ENABLED(CONFIG_RODATA_FULL_DEFAULT= _ENABLED); +bool rodata_full __ro_after_init =3D true; =20 bool can_set_direct_map(void) { --=20 2.40.1