From nobody Wed Dec 17 17:49:34 2025 Received: from SA9PR02CU001.outbound.protection.outlook.com (mail-southcentralusazon11021092.outbound.protection.outlook.com [40.93.194.92]) (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 587B721506E for ; Mon, 9 Dec 2024 07:20:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=40.93.194.92 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733728860; cv=fail; b=tYM714NEkAqIDiyazSDeZLjjXrmd29jnM8iK0lJqqXcJDX7mhicTxIXc73IEvN5UGFo1SjLtieO8x7gFrxXzM8cu2GYoRFkE5SkYLygPqwafv7sSJOk0Th+U9MpOgWt/d5QJgktWNX/IFUYmrwo4bDZBvTQwWKuhoI12QNWaRu4= ARC-Message-Signature: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733728860; c=relaxed/simple; bh=iKMGYS2mEl+8fBtTYJBhNxYkyypyAQ5qkB6JKLwBWt8=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: Content-Type:MIME-Version; b=WuKPJ/+mhn9VhlOCdRrurUDGqbBs9M+Nf2BN48DkLT3NBftTnd3M0B4Y9sI5iKd7WtNPpb4NM/05ZCSajHYGW57Rpkron9zIFDX38hDcmrxEjYqqbFCdCArC3r9RfWjWPGb/uEzW5kQE2HGXjiliuLg70niDGVhQSHWQ6CxxXFg= 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=HEq3srIg; arc=fail smtp.client-ip=40.93.194.92 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="HEq3srIg" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=oJH7qOdv/qbd8ZzSDx9Twdf8RcCTn2UqKU/lUJhjTloeC4oUU/l5+g+i1IGU4RWKXjY4uPNQnA1W2WHc6EcMyUbWuMpcIYzlUWZbqypp1ZBv/5MXyYsieCQtAJEAepSCN0hAA82QnhObgyG80W0ZElXmi26xMrnkONBZFQMXPNRo9BIheKBWTHvAgHiDOxi3bQhEP/29yVcmsuK3yS0rNTIDoKo+vB5CPsh3URUuyzGCUkBY62ONCTirIDaJZ5blI+/ie7dc/UEkpBh75kpbzaBFwlxqUGu4+hwKrucqi1u1/DKPj4P9CUxps0x3xuh0rUZ4fygoBIbKIfchBNhFGQ== 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=Rbu53Yh+kA1LS4h1xYEPR4/hP0SYV0lyQIuCr3buQy0=; b=ewQN/o0ikzPXhIEaU22/5nJ9l7T0hwtmmSkpdFge7nUZY0hUADa0fu/wW+ZZ98ybsY6wrYB3JHHGUXOFY/j51lzoEuzTTS9sOSUJclXX57ynuqJA7nbokE3uQe3CDvXwh9qvvxYEAAzSfTE/sT14EKvBmx2fZOagDwR0Vu7pJnt99Fyh9FuClivfwqt4WoPSiLENQgls0AdwkWP4Q27rqYs70hqfjiUPgtZiR19KxX51AAzUxNMfnftKdAa4WbRCH/gSs86+oHQbO2y6CWGZUKX63Y6B/vdxoZ8t8gXhH1wRnkEEylHyDdW5S54V/lmaP1MHamCyvCyNcSPWArkcWw== 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=Rbu53Yh+kA1LS4h1xYEPR4/hP0SYV0lyQIuCr3buQy0=; b=HEq3srIg4R87Pb0ltXCDI1oriZDuoHUJ7jGHFpZFfz38MSX9suo1COIQqT7hma7c5kEz6HKu6BvoI3F99aTXReBcUKfH7cd1YWcLi5WIUqt0H7qfcdhTUXsU09uvzwXVT/FAsEUXuasVjbta9fU/jFOSkArnEFBXSlvXOStgVSI= 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 MN0PR01MB7876.prod.exchangelabs.com (2603:10b6:208:383::6) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8251.12; Mon, 9 Dec 2024 07:20:53 +0000 Received: from PH0PR01MB7975.prod.exchangelabs.com ([fe80::6926:a627:118e:8050]) by PH0PR01MB7975.prod.exchangelabs.com ([fe80::6926:a627:118e:8050%3]) with mapi id 15.20.8251.008; Mon, 9 Dec 2024 07:20:53 +0000 From: Huang Shijie To: catalin.marinas@arm.com, will@kernel.org, anshuman.khandual@arm.com, corbet@lwn.net Cc: patches@amperecomputing.com, cl@linux.com, akpm@linux-foundation.org, thuth@redhat.com, rostedt@goodmis.org, xiongwei.song@windriver.com, ardb@kernel.org, inux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Huang Shijie Subject: [PATCH v3 1/2] arm64: refactor the rodata=xxx Date: Mon, 9 Dec 2024 15:20:19 +0800 Message-Id: <20241209072020.4743-2-shijie@os.amperecomputing.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20241209072020.4743-1-shijie@os.amperecomputing.com> References: <20241209072020.4743-1-shijie@os.amperecomputing.com> Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: SI1PR02CA0005.apcprd02.prod.outlook.com (2603:1096:4:1f7::13) 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_|MN0PR01MB7876:EE_ X-MS-Office365-Filtering-Correlation-Id: a7ddd485-38ff-4960-2303-08dd18220448 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|52116014|7416014|376014|1800799024|366016|38350700014; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?Z25OXHCpI7f93AEvnKobBvQci/Cf0isC7xTfRl4IG0IDyYXak2cOpPYSvr03?= =?us-ascii?Q?6h2rRD/SJFN81kfxzxKz6cyKHddnwJqhauyRZxzUYOJdcdkpAxK/SAEYSp6W?= =?us-ascii?Q?pO3KdCI92j+puugl6T3tYxsaL/OUIUQs3TT4vR1bKlQXGmvB74wer2/qEdMi?= =?us-ascii?Q?pvBG24P01NZD66LW2AzKTIKa4NRar6y1vhRmerHAnezGZVQVHALsuFc69Mo1?= =?us-ascii?Q?ib7h9GjbetTDnLoPlgX+rvu27UPMMlvnfQcaE6e5ZcmvqRjCaFW0dzCdvWN3?= =?us-ascii?Q?BscDI+4p40rxLlYKkyinW+fc/WSJJV4NZX2NUhFsgMoOenqvuSIkGlg/r+JR?= =?us-ascii?Q?zIQ1X+UYo33TFEx9I191D6hY4oOe795h9hmB8bk3OcH+mQPx9f48kUIJ67Bc?= =?us-ascii?Q?zyXofEqUAyh2xbjuW4Ef7UDVkBH+buZM9Ef4CDqRKTdFBQ1aZdkBXN26aDOC?= =?us-ascii?Q?xLkiKFag6TxF9giyQ7SJpsKO5HI8rrZTRpQkaovy3cp1eCVqRY5V/ehgEsC6?= =?us-ascii?Q?2QO9GPsmGPyQQ4Bn2xNwlw/exCIsVA6YHyQLVMU+Hl3lEbzkQyHnTaXvZjMT?= =?us-ascii?Q?hvdbydWrcQD6SIhOMeVSrBaguZ7J9qUvpkm+alDLDWBsF5n8fXKQexoCcDsg?= =?us-ascii?Q?0RzD7p6pKXA/k1zOLxPSv0sKa6rXOXL+RqmUQr3Yyh0EmkDiKfFRUgn3fu/9?= =?us-ascii?Q?p8KnKnTOB2+tDZCdkKWwFx7NyWGlCOm/de21B85QPRIMigd/NQYnpTfeABl9?= =?us-ascii?Q?l/mQZhkCSAF3llBdtLmBpPXyxDY9kloCg8K7Nyq78NaZrmejB8bXgYhlHoCt?= =?us-ascii?Q?V44b1gfUjxHta72RIT/IvloTnbbxp04R7WE+BvsbR+nFlzwSQWYQFxDXxDot?= =?us-ascii?Q?OcGEc+jLAWiC/HNxl6LzXQgXVle/LUoZpI5yeiEQkR7ERBy5r21NBAR/3rXE?= =?us-ascii?Q?1p86QIIeH6+qXITC8J03hfHpzXaLMn8kJGEc6f7ABkjmjCkctPyMnm9IVTQf?= =?us-ascii?Q?X/CZelJsgtoShnbY5Iqve6VdAg63nXz2rpqBiBcVFKhZEQv40bCqllSKlQvW?= =?us-ascii?Q?OjDZb8myr2zv/pfRhlFBvC6XfVhIOsvjw27f0ZlfEnuQhok4jzJXoda0CJfc?= =?us-ascii?Q?BnrNrIfbuAiSbFllVQaJM2g1RgqoJxX4CJGEtumqCn5z9yVPG3x3PJMP0PA+?= =?us-ascii?Q?ZfHGIhiulnuCNE02+JHo+0T/Pn5Mn7aZbl3vmxQcPoOQ3Iy3jlozFrILhXcD?= =?us-ascii?Q?ZgZ6SKeFN62BE5psZyC6I15Z9nImi16O1HKt3F1LgTPmhzb1G8hyDH0Mu7iD?= =?us-ascii?Q?P5PeOhENnNmIDu7fmS3w8v79oWFQ5zPg/R9bGZrSc7bE7IIKDAuVKaV6tQaT?= =?us-ascii?Q?buos6Lo6oDImVazRYTG6H/M1J8H/RllU/CLG+u8X84h5C0pu5w=3D=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)(52116014)(7416014)(376014)(1800799024)(366016)(38350700014);DIR:OUT;SFP:1102; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?Sha5SpxLd4mCVYvPLnZs7U3mwHHGDebo/i8acwWGyQItwFH/i8cYp/YxkSAS?= =?us-ascii?Q?Zfr4bCkRdDUXVpPHRN+tt4Eprt1H1/4/XiF2Ipd/grM082InvEaX3e9tk9fv?= =?us-ascii?Q?7aO7AQM5s4NJebIiMdlJ3a7Xmpqr3Z52YsdsqEaBOFAbXGBM9JCKPiV983Jw?= =?us-ascii?Q?aYqvuW5qHBQpo1N9tH57m0zvQrSvOhqsUYmF0vbiV4AeRanj0fXepHw4+mUi?= =?us-ascii?Q?P3H3CfpZQAIj/W6zebuxAiWiavNwHZTfFqKQc3hmwxxKJ7w9M2C96IIY5qbt?= =?us-ascii?Q?Qfs4WoyWbNRe9+2CclXw2bSGkAJeg0/6/Q6VHnpoSJz0knKUOdRccc3jDfSH?= =?us-ascii?Q?AFCIxF0R1PdLrakNEl0DZetXqD1pV1YMtRU5VERj1qjghIUz8LjipI0pDcqm?= =?us-ascii?Q?9alakCyi33+BYvSeOFdrDbwOWt1YqUEbD/pchAEYRUrkduXPXPNhMjFy7fY6?= =?us-ascii?Q?TULve9Jtp+R+Dycf7yS8iRlb9pbh/Xz7MoJd+Szc/atvB4LPVMkgB3ahmAuG?= =?us-ascii?Q?2RoETNCz1gv6TDoqyiruf0XdKvCPvufZO8XXyPzXkTPT+C22aln9IeRmZ8LW?= =?us-ascii?Q?ziVuKygdtbtI7D4IK6jBbnhOKa5wNzbi6YLfngcR3XcYueE6epexEe/+od5Q?= =?us-ascii?Q?Fv3LoFZhPZR6T2cF9X93c0uKcVycWIUZmqn3+PLIxTW9h1ww9+kKEL6PTs6A?= =?us-ascii?Q?xyoPZZEwv9cJ0hbz8UjxOvL1jOB57Pcv/UnWEI4dVQxispzy19sCQW46AzOH?= =?us-ascii?Q?6gTG/xrZ0dXP8FtxTI9ApmNZWucbl6PvrUgrsjbwYTgcCaTTWhRr2P+lnfh8?= =?us-ascii?Q?YDeffWqpLvz3hmpBUJJpdFSt5BOTKlicgad8pJY4pun2nrm/7ffiPh7JabEf?= =?us-ascii?Q?mpcpulMXWgtQYZXC3mWep2+FJpddFnYEYLtARLwJOq8EXTCGPDw+kRmCQP9C?= =?us-ascii?Q?RSEZH10O9HPRlswAEbWSGa4737WkNfZHsam7hY/BHHEurzeTcwlSd1BwCM6a?= =?us-ascii?Q?TjOktcZyisoYYT+o8dzaqCXnsk5bhKcj7vUiwcAHYny5x/DCSJpDNDLyIk6i?= =?us-ascii?Q?qhFMuEkfTdpONyzRXTQXOqxn9gsZB/j75aesv6WsQmZ77tB7swWvv+VLC6Z7?= =?us-ascii?Q?lzAY/4do/OC+pS50iuAsP/4rxUt/OfwsfWL+fU0DJX1vAkf4GtoaegBiOqVn?= =?us-ascii?Q?fAR0WhIbQDc0L1lF+xG75cEWnLunnNc/cpKPIpq/aKT9rGw45Vw3Jix34oCI?= =?us-ascii?Q?oKF4weOo54vlvWNNy56pZ5eXGGM9o4sIwklcPirFaoJunS1zm8oN3/b7ZyGu?= =?us-ascii?Q?DHFgO/U6aEfaDXJc0GJChQoX6syF3p49BLj/19+3p7EaWYJABvkxGr7dr8Rv?= =?us-ascii?Q?z4UG+4/lYQgpBJncP7AMrsXok8ooBf4GLt34bkvzfdzFCKknXb85sky2Y09u?= =?us-ascii?Q?iuSERU0A1Uj2rTP3kxVa0FxAX4jQP/WPN816BuO3UeKpRVKCzLjwelTVSU/F?= =?us-ascii?Q?T8DLWBLaoeWmSvb6y3G5rD/YJ/3TaZSRuaDGiCKgjxuC7FG0r9oWA+alCvdk?= =?us-ascii?Q?pQjwJ4Z7TUZLamQV6BqqRY0ZBzBPtoRSnC6/vOXuuZMt+awPle8m6g8N3zrX?= =?us-ascii?Q?A+7ZwA/1h+ilTPzQEuRDF5Y=3D?= X-OriginatorOrg: os.amperecomputing.com X-MS-Exchange-CrossTenant-Network-Message-Id: a7ddd485-38ff-4960-2303-08dd18220448 X-MS-Exchange-CrossTenant-AuthSource: PH0PR01MB7975.prod.exchangelabs.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Dec 2024 07:20:53.8400 (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: BPCnal/2aPa9CBsHbN1xp3iAoeYEJbc0/id/8nomJFsJKRDA+D2t+cFK32Yi2x7scKqmV8+t3sFcYjhyxHihDwDCGPSaYincxuuNmWQsZAECL3eQcRKgL8ku48X41RMo X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN0PR01MB7876 Content-Type: text/plain; charset="utf-8" From Documentation/admin-guide/kernel-parameters.txt: rodata=3D [KNL,EARLY] on Mark read-only kernel memory as read-only (default). So "rodata=3Don" is the default. But the current code does not follow the document, it makes "rodata=3Dfull" as the default. This patch refactors the "rodata=3Dxxx" : 1.) Make rodata=3Don behaviour be the original rodata=3Dfull. (Drop the original rodata=3Dfull.) 2.) Introduce "rodata=3Dnoalias" which is the original "rodata=3Don" 3.) Add more comment for arch_parse_debug_rodata(), update kernel-parameters.txt. After this patch, the rodata=3Don will be the default. Signed-off-by: Huang Shijie --- .../admin-guide/kernel-parameters.txt | 2 +- arch/arm64/include/asm/setup.h | 25 +++++++++++++++++-- 2 files changed, 24 insertions(+), 3 deletions(-) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentatio= n/admin-guide/kernel-parameters.txt index a22b7e621007..51bce7b9d805 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -5901,7 +5901,7 @@ 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 + noalias Use more block mappings,may have better performance. [arm64] =20 rockchip.usb_uart diff --git a/arch/arm64/include/asm/setup.h b/arch/arm64/include/asm/setup.h index ba269a7a3201..b3063326b79a 100644 --- a/arch/arm64/include/asm/setup.h +++ b/arch/arm64/include/asm/setup.h @@ -13,6 +13,27 @@ extern phys_addr_t __fdt_pointer __initdata; extern u64 __cacheline_aligned boot_args[4]; =20 +/* + * rodata=3Don (default): + * 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 requires the linear region to be mapped down to pages, + * which may adversely affect performance in some cases. + * + * rodata=3Doff: + * It provides us more block mappings and contiguous hits + * to map the linear region which minimize the TLB footprint. + * Leave read-only kernel memory writable for debugging. + * + * rodata=3Dnoalias: + * It provides us more block mappings and contiguous hits + * to map the linear region which minimize the TLB footprint. + * And the linear aliases of pages belonging to read-only mappings + * in vmalloc region are also marked as read-only. + */ static inline bool arch_parse_debug_rodata(char *arg) { extern bool rodata_enabled; @@ -21,7 +42,7 @@ 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 +52,7 @@ 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 Wed Dec 17 17:49:34 2025 Received: from BN1PR04CU002.outbound.protection.outlook.com (mail-eastus2azon11020125.outbound.protection.outlook.com [52.101.56.125]) (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 67E5021516F for ; Mon, 9 Dec 2024 07:21:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=52.101.56.125 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733728866; cv=fail; b=a5RSIMjR/w5oauVT7ikp7LvNsuYylbkgw7zZx/UEltSzRDzosYK+JuSCC281n+YWUpsBcdrouiTaOsMsMT4K6Q09xLT6i7B1wS28i0r3wY3L1yPI7UxaBfd6lgyPZ9XD1pjOEmamJDrvD0TjFlL5ZfmmHzlJuDhCyn5Wp+COgCw= ARC-Message-Signature: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733728866; c=relaxed/simple; bh=VRo3P7VT58J9rDa1apiwFPCFYg8pIhuUob9V80EptUc=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: Content-Type:MIME-Version; b=rC8Tt3WvMlkeo+cfP1zGawFwaONeTKS8vbqr0e5a1Iiuwr96VYwmof2wA+4/rgscJbuiI0llVirxIAKyD6Va6C3RDvTjMe53C/bWE0krFDyrGkm+MVmoX1RChhGcWYBp+rk0VYyiEgHam5HZWd60IH/Jpc2zyyK6bwB0gNnWIQ4= 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=pF+pjtgl; arc=fail smtp.client-ip=52.101.56.125 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="pF+pjtgl" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=Bh8f57Rv0YnLwB78STuNEbWVEezHd+boHjUCEX9SgFDvgrxPQYp92G1tOyTVnNRcYBJCdnX63dmdZlz7UhCH1ACWlP31+Q883gPYEne2lOjJyXyP/+mN8VKfuVDqd+K6g/N079uu4oYVrBwjZuhra9/9NRez4LuOFHichUFjvBnEt420vQp1DIgvnLSvmLyBsOkz7Kw6MIOwm/l0HeXxvoqdxD1mmUzYg52U8dPE6j+ZSIP5Ydoi7XR+G1biHUWP/d4svOEnDjw4eiYkbQfWnmHY5MGdir9bBt3nhzzYATU33nPxJA+9N+Gp9iW9a5LQz+VzvzBhySy6kVqtxDsS7Q== 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=F7AL4BcXa+HmHafwP1jO8SG1fRRg2L2Q13y4RXZu+3o=; b=DNfCcYCMNhE1P9SNC36NpQUEHESEB8jXnV/EguIMo+jUTL1kzcs9Pdip2mR9z/O8Uvfpv3CYKIX4SSIBeAkkzyLLmA/1HUtqdBGpYeQ8pv93mOcefJyRpjW+xeSl3HMIoDI4DFWAw7QBOpxCiwQf8NIRrX2BfGUWoaVXqmxvzG8roquOXDfaeqx+XaaMpkY88QZTLPGZ3fcNuuSYVaZP7bD+YVyzIJmjXF6JxKk7QEviDb5wfKCn/3Aamut3KtCv+VkH+5t8AuADwHLoP9a7Zl9HPaSbpFmWQN8rzN39tjLklVsyHQER4gTTw5lQwBLEA6Q+xcmkX5oNVcjxL0GP2A== 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=F7AL4BcXa+HmHafwP1jO8SG1fRRg2L2Q13y4RXZu+3o=; b=pF+pjtglaaa8U7M6yY2jbHyyed1C2mkocCUehec0wpfxkcyxNGiqmrgODOcLV0X6/gbQDl+NgRhwVg/DzAsRJGRK2SI++/K/H1NA/GjSMht3VClIr5KJj+1G48sUDvRpcJ/7L2vnzRYXLKsVXWTBh3mxsUbi1KMw8EgfxZ1h5Tg= 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 MN0PR01MB7876.prod.exchangelabs.com (2603:10b6:208:383::6) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8251.12; Mon, 9 Dec 2024 07:20:58 +0000 Received: from PH0PR01MB7975.prod.exchangelabs.com ([fe80::6926:a627:118e:8050]) by PH0PR01MB7975.prod.exchangelabs.com ([fe80::6926:a627:118e:8050%3]) with mapi id 15.20.8251.008; Mon, 9 Dec 2024 07:20:58 +0000 From: Huang Shijie To: catalin.marinas@arm.com, will@kernel.org, anshuman.khandual@arm.com, corbet@lwn.net Cc: patches@amperecomputing.com, cl@linux.com, akpm@linux-foundation.org, thuth@redhat.com, rostedt@goodmis.org, xiongwei.song@windriver.com, ardb@kernel.org, inux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Huang Shijie Subject: [PATCH v3 2/2] arm64: remove CONFIG_RODATA_FULL_DEFAULT_ENABLED Date: Mon, 9 Dec 2024 15:20:20 +0800 Message-Id: <20241209072020.4743-3-shijie@os.amperecomputing.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20241209072020.4743-1-shijie@os.amperecomputing.com> References: <20241209072020.4743-1-shijie@os.amperecomputing.com> Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: SI1PR02CA0005.apcprd02.prod.outlook.com (2603:1096:4:1f7::13) 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_|MN0PR01MB7876:EE_ X-MS-Office365-Filtering-Correlation-Id: b398abf3-6905-4243-118b-08dd1822072a X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|52116014|7416014|376014|1800799024|366016|38350700014; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?2O8uvrOx873GhmjM9I3AVL3xLoT/8U11kEE+MkWL1fcbxdFuCod1V9/g4XKP?= =?us-ascii?Q?1QSJ11LN/aQyrxDmoEfNKwfjvF39s82GWMtGyye2ICf2x2IjD05KSAVtg/Rf?= =?us-ascii?Q?JtCzF/g/PDd6oWA765Ul1JOw2YMI705eTV8IzCxOrmc//jmU6qEnhJgW9hxU?= =?us-ascii?Q?uLLC5l6z6QrXBFxiGDcTJKM+uqeQCy78v6adlZKSv6gCO4+Eg6A8pZghhGTZ?= =?us-ascii?Q?wjzlnPJ96EbdpGIzjHz73XFC6Dm64vsyBaYcKzPcpSnMq8s+X/eqwQJoQG+9?= =?us-ascii?Q?EN3IwlWHKNcF2SFXtJr3n9I/vGu65Egz9ZssFScZQ2oWmEK6y/3uw0rE36Ry?= =?us-ascii?Q?WmIMLg7I2AHyZrslkPOQf54Uv8DT4rBDEHnr8cQGicfjjcq4wVoXsrZDsQOC?= =?us-ascii?Q?iYEUifBgvVqlh4mWciWSRg7WR81d1zxY3lmx05YsoqUI4J9AZW44fGFmMd5w?= =?us-ascii?Q?w/y1HjXqjA+Pfgntt22aaDDPP9XvJCgJbNiyc4OiG9WEcUYcsq+Y61rjX8mM?= =?us-ascii?Q?oaP2bYrSExSsUhMFl5fc4aH1f/zIgxY8nBWiV0UWTtvxLHQb4Bc2NssXDAKY?= =?us-ascii?Q?p8I/QbK1j2uz6DVELdloYJ/Xd9Lzpvv3+Bw3N9u6LmwdBrUMUAIhgS6D5kgM?= =?us-ascii?Q?nbOSs+M6hnm1BMeEC7al82Uz6KcVbrJ4OrLB36iOrBrAcBXOb4JsImDPO1D6?= =?us-ascii?Q?NKqkdXRl3/rpHNziWhX5wAnwYjQz1yvSBC1Av3Pj4UDFdi9YL+hueFptNeQT?= =?us-ascii?Q?vYzHMA2SIldmprzAcaxCr4bxPMzuWKxuGjHERsQS0OjsyMi8TaN6bPc0GaDK?= =?us-ascii?Q?M4R+k+BlFg2Y6TJPG4xSW53FiddmiUzioi/Sf+Q3UTISPYpT9lUXNzMeb977?= =?us-ascii?Q?bAu8Kh8yIVWzfKVVzT5OgHNhVZd0sk0PDjOe5yIPkS5r1HfOjSEWlQW1b92S?= =?us-ascii?Q?4FnyGKP62AFZLdgj1iaDHmQMfIBaetMRl/zEdTR0vYzbpb0WiuK8+VMv7KSJ?= =?us-ascii?Q?PmaIUILjZy7lvDh7MLqd00uyyGdbX7wtF1crZTLc4derVRzP9bqF0KKbHTlg?= =?us-ascii?Q?vvSvwXJ5Ir4NkREPcI1OzQY6mMrii9xXdPWxZR3Id5rWN4+HsxtifgOykq1C?= =?us-ascii?Q?w4jUOkO/E0/uVUWv56WiUdMdxkaq3x8Ngugod/zUnGZEBgH0xc/WFRI0mqwI?= =?us-ascii?Q?XxYaYTxX0AuETl9PmWEDGq0MhPfiHWfwGScVOYcGF/prgnL/snXJjJua7zse?= =?us-ascii?Q?y7dyxlvVZh6TXuzMM92tc4Y1fjODyHLjk0RcOR6nsUfg3hUc8UagrpzAC5dV?= =?us-ascii?Q?yD5c7/TUz1NqesjCFSH2yydmKv93I+pl2yyQKk5t0+XWlhx/qipwqguVI7C2?= =?us-ascii?Q?Oz8ypuWGeYfbPTiNC5Amyz672C9j0aibp+4a/uSOj5x2avEySw=3D=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)(52116014)(7416014)(376014)(1800799024)(366016)(38350700014);DIR:OUT;SFP:1102; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?YB7YLhgy+i4Rtv4MF7Bgg27RxBjRkQkeUOHwTQHAMBNWcSLEWHxLShZqxYrh?= =?us-ascii?Q?Lnf2Bj4wAYmOm3/Tg36qTc/w9OUaNZx3OhPjgz8XHD4MGiLyAbnaAPY2w6Be?= =?us-ascii?Q?heBAXWgxFHU0BmK9TJ+qQbiVPVcLMj8FGv0uk5kqsf630XB8933n8Jg0S42V?= =?us-ascii?Q?VxWvydS7tR5WnRK86rpG80Z5Th7NasFOAvajXYgBLdZdYF+eF3EiYb8YjzDC?= =?us-ascii?Q?PBWHXTi4u7MsQBDj014i1DFl4wOvgK8I2hJStASXHClmEXoVim44Ytz/83Kd?= =?us-ascii?Q?UZT/K+OuduCDCQdBIpYT2MWOJKIOI1pnW5jlqRu9tHNV9cSNciM51y3nqt+k?= =?us-ascii?Q?3Ohv4RHmPX0FYiW5mEIaUE0b5RLvYfqmHvpJRNKxcMGoeKaW66LfRbjdmNSX?= =?us-ascii?Q?QsockmYeSKnOS/nHsiEnhdRs+0CINxwV8GrRJ8+ZEEpvGIN2RP0DZKzKwMa3?= =?us-ascii?Q?iYHVGFUi3FZJk3+snl8oIgPvw/yWb6MY7WUtxoL4b/uVsrmKxDfEF94Idl5I?= =?us-ascii?Q?+VdV/XNfgj/V1SHAYaVLeZHJvvaswXl4eIuHo2m/F5u3kbDuoWs8LDm0QyDE?= =?us-ascii?Q?ekg0AKImKYO2wPACupgfLXxBcL8KXWo7uSFoLNVWcun6+41hThKCdlMmu6QP?= =?us-ascii?Q?TSl0nh3hDg3yDAAnEsy7MnJgaaapms8MMt3wZIfE4LRtFpbnNkSY07w98uCn?= =?us-ascii?Q?tjS5eRXo9SuRbovnESA1vOzGcxPjAwWvEljrr0+Q8Gsb5f2AH9HSMLVW5tgG?= =?us-ascii?Q?Dm0OhdwT/PdJKSYBRjqqNluWQfJ7USIzU1SaRU6fJAbLtmB2jpkgk07BXiT+?= =?us-ascii?Q?d3wAuHbtJVSzwLg3So0jLg0oxLEw1I2YykImmyQBe+zVpE3PnLmY0WN07Yh3?= =?us-ascii?Q?ljXsfnP9Qo+My2dZGt8z+MNHVup/VZ6TPrqKtWoYBjccwxY+PzPtBbqHb6Bk?= =?us-ascii?Q?NGun9vxtB2C3M5BTYqefs+poxjj9Zg8Wi8Er93bOQfqo/xnTdAQDCv/6CZmt?= =?us-ascii?Q?o9xs0b3xeLq66A8zg5Y3VZ5DKamWt9AudESQn30T3rw4mUbsNhWIeQnRbavc?= =?us-ascii?Q?MOGP9exeGNKRyGWO+v5KlqI7cIB8r6iJUo38PCaINzfM9bRigN3gflt1lzdi?= =?us-ascii?Q?kgQKrQLwpq/+3S4aMIq+BPibuGSGsqOXETEBJiPUBfjflZlJmuxJ38viQGA1?= =?us-ascii?Q?2PL5W0EsoAFqZ+rmo1A4qPHCqJJXaKPYlRZAnhIXscCi2gJGJmmMkAUjkUpn?= =?us-ascii?Q?D2LONHomRTR3bJELPShoe9QaSuxzUW8TMWHVeTT4wy+JCnroNFX1VCYZYNO/?= =?us-ascii?Q?rLOYFu1Wb8tDy6KlvF9jYs1GPDKjYhNkcrrsRUFwUmQCpRuNTs7RYCAFvvlp?= =?us-ascii?Q?N1/yA9DMY9d+Bf2sv17EPQgJblDSqOu7RDizRP3ElXI608s+upPm1KKmlJn3?= =?us-ascii?Q?+TE+ZguIMZ48hxnJ71vcMpGhHmoXVDC10JIyLZ0Z44njRSELs0n3HOEiV88e?= =?us-ascii?Q?8Jp4E4oZWzoswupzwOpgVx4gKX8Ggvc5hxvwi97GknLhuaezeO7jeToCt/x3?= =?us-ascii?Q?20zIc7lIqJkFWJNnQi7ZPKppxBesK3tyHcGUt1+b25O79ah4HgezoBYEKruG?= =?us-ascii?Q?20sLjS2LKmhWiOmMA5vhfDQ=3D?= X-OriginatorOrg: os.amperecomputing.com X-MS-Exchange-CrossTenant-Network-Message-Id: b398abf3-6905-4243-118b-08dd1822072a X-MS-Exchange-CrossTenant-AuthSource: PH0PR01MB7975.prod.exchangelabs.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Dec 2024 07:20:58.8408 (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: Y/9yszKILYt9cpDTlDxw7izD+kBQb79fP9DrsscwFB61cFo0Ypy/4sDqUOYAqfibciX5V+bW6rP5xTbghEWny5jJZOl/1G4jPZPeQRV5lz23NArIcc1aPJwanoMBlu5x X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN0PR01MB7876 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. Signed-off-by: Huang Shijie Reviewed-by: Anshuman Khandual --- 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 cbfd357f94a6..1c69982302ed 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -1666,20 +1666,6 @@ 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 39fd1f7ff02a..6eef08d8451e 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