From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from NAM12-BN8-obe.outbound.protection.outlook.com (mail-bn8nam12on2066.outbound.protection.outlook.com [40.107.237.66]) (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 904862F5322 for ; Tue, 17 Jun 2025 23:47:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=40.107.237.66 ARC-Seal:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750204049; cv=fail; b=mIxL3qtOCsYqVVYvA86F+3mkCO0BNSJIiPEQDuJ8pshK/cWPCsMfR2uJ0E7fdTUacE3q5XHO//c2KQ5fDPiWOqsKzDwqKeGiGS6IjSF3t1sSDv0f/dT7KriXKZaFYWJWD2l7oHFu8HCzptG31NYgE441nzwzYms3wO4ekI1cP7Q= ARC-Message-Signature:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750204049; c=relaxed/simple; bh=/w4uMGZ46sTeeWMIDBl5uubskwZdKq9fAWBIYTgPi0k=; h=Date:From:To:CC:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=TN2AJHpFukB6ppvOz9rCpNLmcGEOaT2Ka2khtrLxq+gqmCeefsyMQMmMv0IlzZHX9QVLeIyDDWlVGN6IeoaiMJP0TcA7Dc63ZzsatFDlYTiTrERf2jBUx3u3SPKNZ92tsuOoF2FHEm2/4rkXTsM43YPF5wI0FvP1lVl6HJP8cf8= ARC-Authentication-Results:i=2; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=nvidia.com; spf=fail smtp.mailfrom=nvidia.com; dkim=pass (2048-bit key) header.d=Nvidia.com header.i=@Nvidia.com header.b=GnmLJqkN; arc=fail smtp.client-ip=40.107.237.66 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=nvidia.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=nvidia.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=Nvidia.com header.i=@Nvidia.com header.b="GnmLJqkN" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=BVP5avv3utbnO5NHt75dWiE48XLg9m33fjzw/zPoEdTfk3Joa8Qe0Tw2/GFa0i0Xw/moAv8CEzf3rWHwjLDZHmNKC/YV6n+s9H8IpUOSrgGGnkcNn41I74bQTh1Ea8llFYgJWPLlpCCEjoF4wiaIdcLzEHSqX1ql3Vafni8M/MZFEtA9bmDghHlZOHgKnV2VFeZfWd6+/18E/L1XFS1AV1i54UjKQn1b6VbOJH96GrnsmJa21KdiwhyTi3MUi/+/gt8AzUD/u5eEEGagUQMk0Y5lG6nW31HjErKvq8/1jugK4vKyqmYEt9ho32EQckg8pQWjYX1AGGNNcZGi6ay27w== 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=0pKk72KMZTbXgSjubR6VdMpalVKtJJPdBfjnywSZ7ts=; b=G9S8Gqogc0AWz0Kd0B3JTGTCsoUUi11cvLujgtZcSxx0DbzYDffUCz7V0moeYXxTuSEi71i+VuPDEZuqFdXHMB+kNCoD6+YUd0pM2WR7AE3p9cIZ3kCvu8Dbzp90NE9nYqRrcqmXSJAMIy6NdWEp37MyVJyIqBWKkrO1pQdvGFxgah8CVRnIS79KtRW+05SKaSeG9lytoH0YDp4mOFE1SVjzINCYQYXtkaLXyIl5aQ4Mstt5MZZ798JjT/umqY0yF/QvtqQgLe6bvFaXmpakZ+xzLjzsAPojc+sWo0O54YfofzayEasVJ+9mpTfT7F62t/MeLm+mmiDeX+j/zYnPEg== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 216.228.117.161) smtp.rcpttodomain=intel.com smtp.mailfrom=nvidia.com; dmarc=pass (p=reject sp=reject pct=100) action=none header.from=nvidia.com; dkim=none (message not signed); arc=none (0) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=Nvidia.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=0pKk72KMZTbXgSjubR6VdMpalVKtJJPdBfjnywSZ7ts=; b=GnmLJqkNnnjhR6XiCoVAab5I6V6CZAQ+XVX0Q4Ad2wEGTTsPzNc2h/Rqy4Mv3d0HhGof/cXUI4/UdVbcb4hKMUaM1cs3iKeiSSulu23AebEZXt7PiONdgsVua9GOuCaJTuu56iyZd59xfXCnXYS4v7GMugLtGoAFRaE6p4w5JJSUzNUOqaBj7R5j6fLQOlNM+COjptGrfgmJtzbaPQQdUEzGV7iU3YiG/SW6pYmTZqr3H8SXTSHVFWSpVa1iayKycFIEt7/vZ7EPnM+z+8fm11HNfhkgqW25DcJ/LBKk+REUgLC4q85873b2OghN1ZWj9ZWhgV5qVrZqTOpZbEN0zA== Received: from BN9PR03CA0210.namprd03.prod.outlook.com (2603:10b6:408:f9::35) by DS7PR12MB6022.namprd12.prod.outlook.com (2603:10b6:8:86::7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8857.19; Tue, 17 Jun 2025 23:47:23 +0000 Received: from BN2PEPF000044A1.namprd02.prod.outlook.com (2603:10b6:408:f9:cafe::6) by BN9PR03CA0210.outlook.office365.com (2603:10b6:408:f9::35) with Microsoft SMTP Server (version=TLS1_3, cipher=TLS_AES_256_GCM_SHA384) id 15.20.8835.23 via Frontend Transport; Tue, 17 Jun 2025 23:47:23 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 216.228.117.161) smtp.mailfrom=nvidia.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=nvidia.com; Received-SPF: Pass (protection.outlook.com: domain of nvidia.com designates 216.228.117.161 as permitted sender) receiver=protection.outlook.com; client-ip=216.228.117.161; helo=mail.nvidia.com; pr=C Received: from mail.nvidia.com (216.228.117.161) by BN2PEPF000044A1.mail.protection.outlook.com (10.167.243.152) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8857.21 via Frontend Transport; Tue, 17 Jun 2025 23:47:23 +0000 Received: from rnnvmail205.nvidia.com (10.129.68.10) by mail.nvidia.com (10.129.200.67) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.4; Tue, 17 Jun 2025 16:47:04 -0700 Received: from rnnvmail204.nvidia.com (10.129.68.6) by rnnvmail205.nvidia.com (10.129.68.10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.14; Tue, 17 Jun 2025 16:47:04 -0700 Received: from nvidia.com (10.127.8.11) by mail.nvidia.com (10.129.68.6) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.14 via Frontend Transport; Tue, 17 Jun 2025 16:47:01 -0700 Date: Tue, 17 Jun 2025 16:46:57 -0700 From: Nicolin Chen To: Jason Gunthorpe CC: , , , , , , , Subject: Re: [PATCH rc 1/4] iommufd/selftest: Fix iommufd_dirty_tracking with large hugepage sizes Message-ID: References: <9515eb5cb58bc8dfec083df51550bd9ae6d60da9.1750049883.git.nicolinc@nvidia.com> <20250616162501.GN1174925@nvidia.com> <20250617115948.GV1174925@nvidia.com> <20250617230136.GC1575786@nvidia.com> Precedence: bulk X-Mailing-List: iommu@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20250617230136.GC1575786@nvidia.com> X-NV-OnPremToCloud: AnonymousSubmission X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN2PEPF000044A1:EE_|DS7PR12MB6022:EE_ X-MS-Office365-Filtering-Correlation-Id: 56c61b38-f61d-416c-afce-08ddadf94eb2 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|36860700013|1800799024|376014; X-Microsoft-Antispam-Message-Info: =?utf-8?B?YjVVbG0xSUlOTnNKenJDa09UK0xWWHlNZlZYU1paZGNwOXlyQWlJZkR6WWlv?= =?utf-8?B?ZmNDMEU2ZmZtSlhIbzViQXllZ0gvTEFLck9VbFJkNXM4a2twNEVWWEVRSnlD?= =?utf-8?B?N1EvczZISmlnVytwMGlVY3ROQUNtZU9aaks1QkN2QVZ2UTNVK09JZklnQ1I1?= =?utf-8?B?VXI0QWFKZHREMFF4NjRPQjVPVkdseUhvZlNLbUlFQUpLMXJXck12Ym9lNHpH?= =?utf-8?B?cEhSbnEvd0FkSnJnUWdneWxlbUdEcGFBSVVVYmNtTUhHVEFLemxVUTNWRkNZ?= =?utf-8?B?aFlSK1NMY1ZoZDVDVmlzdEpWMERQbnUxN1loUFVGVTcwSVl3YmJEWHFqY1pL?= =?utf-8?B?eFEwOThxY05MQUUzM3ZMTTlXK1YvV1VobVBDRGRhbElLc3NKRit5aDRqeHNX?= =?utf-8?B?c1pQRmZIUmFUVVVjaGFFTGo5R2dpVm1yaytDNEEyV1hyaTcvV212b2VQOU54?= =?utf-8?B?blFsQ3B3dlR3U29iL3RDVmZmZDBhYUZuVFFodjBaTGQwK2dBdk5qcGs2N2lR?= =?utf-8?B?YWlrUTBUaXpZeDlBOGJSUzNpUVFvNnFYc3lTYnZ4djlON3FIaEs1dmVETmtK?= =?utf-8?B?UE5FVWIraStmbTdyZitnNmlnaW1YZ3lYcDV1RGdaTWs1L2VQZW95L0Q2SXhn?= =?utf-8?B?VWlsRDRob0dSNDdtOWNoQ3BadXNXaVJYNFovd3NOUzdTd3dvdEdyQW9aWS9Y?= =?utf-8?B?ckFDVmJhd084eUNvSE5QUXpsNUVHU1REQ3MrWHlHdThPdnNwclpLNFJtV1RM?= =?utf-8?B?QmIvRVpER2NhKzdYODVUSWJ5cjNCUnY0MkJjZXp2VnV4SlpLempFZDBCLytl?= =?utf-8?B?aWZZM0JJNXVvNFhVZUdiUGRxaEdLWFlDV1liMDhHUG9ZODJmUmtDREQwV3JD?= =?utf-8?B?RzNrNWhIS21tUGVaK0hqdjNhMlRTWkYydmVFN0ZZN3dnK2s1bUhtY0daMjFm?= =?utf-8?B?UG51NHc2a21OTzZkTldqMG5WZk9tWXplTkhEVVVXOUgxQi9SVTkrYTQzZlV5?= =?utf-8?B?c2JBVm8zNFhiSUthYS9iK1EvUlNvLzVLb1A0SWpPSTQ0bjNSdFdrVTJxUWR3?= =?utf-8?B?bG1VWTRWcmQxZTZFZ2xKRUtZNEUzbDhOaU1VWmlQSlJCMTdQUjBYQVQvOWg5?= =?utf-8?B?SWhPVytwTldpV3lXeENWdnNseXNENzZ0S2Yyd2Q0d1RUbGJ6MXIrTGhKUE0x?= =?utf-8?B?MjYwZWNtZEh3eTRFYVNtcnVuQzE0encxallzNDJ5ZHd0b2g0cnBvTjZ6NHpS?= =?utf-8?B?bUVLWi9ieG42VHR6UGdPT3RhSTdSUG4xRm9RYjJETitlRkhFL0xlTGlPS3RQ?= =?utf-8?B?Y1NGVjVXbXFvcnU0Qnd1OGszcG9LejJUZXZCZDdkU1QxMVk5amgvMHJiZlpK?= =?utf-8?B?UUhMMDJIb2ZySks4TE5obkx6UXpxOXhXUWhIdHVHNEkrVi9VcnRJTjdZcGty?= =?utf-8?B?MWQ3WGN6WDFyNFMrNTk0VGVLTkpZS25yQ2VKY2tnQmFnMW5Pek5hTmsrUkNB?= =?utf-8?B?ZFBmbk5ka2JuZTZWQThvV0lHZS9TcG1RNzhHVHBDQlVVNWtCaWRYU0tiUjQr?= =?utf-8?B?WE4vQktzanFLTnRCSExHT3NVWWVoZkpmenZsNnJiYThRZnpFQURub1FDVkZp?= =?utf-8?B?VURPdzI0RU4rU1JKMEh4b2lmcGRCZkN4RE5STHBCSTB0YXNmWDdXTURhVFZm?= =?utf-8?B?K2RZVHprUnJTZlZyN1NlTXAyTkZBSVBJRGNlSmZUQzFGK1kyRExWNHA5Lytw?= =?utf-8?B?YmZqZVBUQjg5bVZwaXBKZzhjRGlncHNUTlFnakNadHZSd2pPUjV6OGRTMTF5?= =?utf-8?B?bFBTVjYxc0ZuRmpGUU1UeVJXOWVDVEgxNWF3akJGcm11czlWRDNXekUxYmdJ?= =?utf-8?B?ZkppTWFpaTFkdmF4Y3VYUGp3MWlvNkg5YzQvU0FQWlNaenphQ1NYaCtIbkkw?= =?utf-8?B?Mzc5U3o3RXp3TFMzS0lySzFWd0dFdytXbDNDUnJzc3owS1Z5SExwRXhWeVF2?= =?utf-8?B?Y3JGOFk4Y2xta3BtVkFGMlowaExwL1EzRmpKM2dkZUpMQ0RpRzVHTUR4MWpo?= =?utf-8?Q?47SuaC?= X-Forefront-Antispam-Report: CIP:216.228.117.161;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge2.nvidia.com;CAT:NONE;SFS:(13230040)(82310400026)(36860700013)(1800799024)(376014);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 17 Jun 2025 23:47:23.3404 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 56c61b38-f61d-416c-afce-08ddadf94eb2 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.161];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BN2PEPF000044A1.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS7PR12MB6022 On Tue, Jun 17, 2025 at 08:01:36PM -0300, Jason Gunthorpe wrote: > On Tue, Jun 17, 2025 at 02:23:41PM -0700, Nicolin Chen wrote: > > On Tue, Jun 17, 2025 at 08:59:48AM -0300, Jason Gunthorpe wrote: > > > On Mon, Jun 16, 2025 at 07:02:08PM -0700, Nicolin Chen wrote: > > > > ---breakdown--- > > > > After `posix_memalign()`: > > > > [ posix_memalign() memory ] ← malloc thinks it owns this > > > > > > > > Then `mmap(aligned_ptr, ..., MAP_FIXED)`: > > > > [ anonymous mmap region ] ← malloc still thinks it owns this (!) > > > > ↑ mapped > > > > ---end--- > > > > > > Yes, this is correct and what we are doing here. The allocator always > > > owns it and we are just replacing the memory with a different mmap. > > > > Hmm, if allocator always owns it. Does that mean the munmap() [3] > > will release what [1] and [2] do (allocating and replacing)? > > No, munmap doesn't destroy the allocator meta data. Should we do something to that meta data?