From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from BL0PR03CU003.outbound.protection.outlook.com (mail-eastusazon11012002.outbound.protection.outlook.com [52.101.53.2]) (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 75FDD3168E5; Mon, 22 Sep 2025 19:40:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=52.101.53.2 ARC-Seal:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758570013; cv=fail; b=CkkShCagB4BHXehiKgHZD251ufg9ZEcIa5RNV3BmgWLyQC+6fFP56QgpFl3ersTzZzfHVY3UZv2HmiiRBTZ9X3nikHsvgZiVWuoMoqY8L4nCottuqNQbSx2S9TcKH38SoAknjwAhCbLy3y1Zr5W/SCHPfnT9UXbHlhbydeW0tfE= ARC-Message-Signature:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758570013; c=relaxed/simple; bh=CL4c2jHsVqZOpoP5Xz3GKJvVkXhdbBuUsNjRA2UE1MU=; h=Date:From:To:CC:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=J/hN8LkWQ8O6jU9b1t2GxxGwbBcK73C5t2r1OefI4G/a3aqpGucg7DGlP3juxei5vdhZwd3AV9W5Qjft1I2iydgOZSk1AnQdRbwFKyBWgg5Yo47I9j5iq1DK5pv9ng63ZUQRo7VF/2Z+1zql34S+J++z2NXEpT7owJhmGstjOXs= 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=dfdSDLIE; arc=fail smtp.client-ip=52.101.53.2 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="dfdSDLIE" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=DJOyPGA4k7qzjV975jSTFBFhE0aKyhv3mg6r+GSxGtUEeK8iSgIsBWi4Q0cVmD/UPrhnB+RfwByAHNuC5v2+tlMzq/dmW+vzkWUyEbZhW0e2Q5uqejZLIqC/zv2CLK3LTDQu68JumUdNlx6lJ2R5GptoYyUOPlZDRHrfeTeiJ8+BSpco5KKqm5Vg0YSKq75No0Vw5SHW7VgWJr53PAgKecCdctgjv/wYHlmrpW9QhcAGN+lTJqH+BjG0aABlLPrGaDdq9dU3U3i/ouPw7Tyy+C/owV9KQy1p5h8phznedYIRCLjy3+WBhVmvEMf0CkbktuNy5gzqfRIS75+DYT9tAQ== 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=ZwQdfVHoQ89g9jRugMa62uAOoXRlQr6J3u4Shgt6m2o=; b=jJz3ULD05pjnBb4+MA9jexQ0M0TFLCiWfr4/ePNT5jV2+/MvkmxZnfSh0mIasHbqGr2QnWVjfCdMB9/XbiDhO7PWARtYgDWbb0kWt3nuVLANrAxPdNAAOT6QvUtqt/GohE0+ncUlvPfLmVeQ0JFKFfj0fpjLtiFJGb/ouZpnPRRdALW4I/XwZwk84/g+A/zW9+JOZurog7NkeeRatC0wyVAYbr+oD/WrnyinjPZmqexRDbxQynzr6W/vgnT0LW7jHmK6O9dW9lFE0000e9RJzk0iMKD6+wIHo+Hxun075Xu6fr+fcUq7XP3OdVcdH6Df1tn38KLHJmRMUn0pjjgTpw== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 216.228.117.160) 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=ZwQdfVHoQ89g9jRugMa62uAOoXRlQr6J3u4Shgt6m2o=; b=dfdSDLIERJOCwLMqFjprl9MK4s9+ekXInt71a8NXZ5GAddHO58ybnVGLXH0CujGvlCs3xFeqhNEOI4bomDr9KVSPr+LWh8EWOylRIKk44yec6F0asLI/HWB+YhJHGQoZodzuCV4RDdadcHTFENy/UoVuSi3i3w9vXczCY78Eb7NnuSJxptsBR3iGY6L3wpfo5m3zGaoHjWt3sYtIR2/kCAxLpobxIBCr5P88CT35UbAv2IRex4tVjTwf8BSvkOBYBd3UD2vXJzWSkwX6axf9tj8EkXS5VXXzOEUbeVVm5o1x2djnd8qamM0l8ay0UAWl0+woWcVB9VFN01KjmU9ybQ== Received: from PH8PR05CA0003.namprd05.prod.outlook.com (2603:10b6:510:2cc::24) by CH1PPF4C9628624.namprd12.prod.outlook.com (2603:10b6:61f:fc00::60d) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9137.13; Mon, 22 Sep 2025 19:40:07 +0000 Received: from SN1PEPF0002529F.namprd05.prod.outlook.com (2603:10b6:510:2cc:cafe::1e) by PH8PR05CA0003.outlook.office365.com (2603:10b6:510:2cc::24) with Microsoft SMTP Server (version=TLS1_3, cipher=TLS_AES_256_GCM_SHA384) id 15.20.9137.20 via Frontend Transport; Mon, 22 Sep 2025 19:40:01 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 216.228.117.160) 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 216.228.117.160 as permitted sender) receiver=protection.outlook.com; client-ip=216.228.117.160; helo=mail.nvidia.com; pr=C Received: from mail.nvidia.com (216.228.117.160) by SN1PEPF0002529F.mail.protection.outlook.com (10.167.242.6) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9137.12 via Frontend Transport; Mon, 22 Sep 2025 19:40:05 +0000 Received: from rnnvmail202.nvidia.com (10.129.68.7) by mail.nvidia.com (10.129.200.66) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.34; Mon, 22 Sep 2025 12:39:48 -0700 Received: from rnnvmail201.nvidia.com (10.129.68.8) by rnnvmail202.nvidia.com (10.129.68.7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.14; Mon, 22 Sep 2025 12:39:47 -0700 Received: from Asurada-Nvidia (10.127.8.11) by mail.nvidia.com (10.129.68.8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.34 via Frontend Transport; Mon, 22 Sep 2025 12:39:44 -0700 Date: Mon, 22 Sep 2025 12:39:42 -0700 From: Nicolin Chen To: "Tian, Kevin" CC: "joro@8bytes.org" , "jgg@nvidia.com" , "bhelgaas@google.com" , "suravee.suthikulpanit@amd.com" , "will@kernel.org" , "robin.murphy@arm.com" , "sven@kernel.org" , "j@jannau.net" , "alyssa@rosenzweig.io" , "neal@gompa.dev" , "robin.clark@oss.qualcomm.com" , "m.szyprowski@samsung.com" , "krzk@kernel.org" , "alim.akhtar@samsung.com" , "dwmw2@infradead.org" , "baolu.lu@linux.intel.com" , "yong.wu@mediatek.com" , "matthias.bgg@gmail.com" , "angelogioacchino.delregno@collabora.com" , "tjeznach@rivosinc.com" , "paul.walmsley@sifive.com" , "palmer@dabbelt.com" , "aou@eecs.berkeley.edu" , "alex@ghiti.fr" , "heiko@sntech.de" , "schnelle@linux.ibm.com" , "mjrosato@linux.ibm.com" , "gerald.schaefer@linux.ibm.com" , "orsonzhai@gmail.com" , "baolin.wang@linux.alibaba.com" , "zhang.lyra@gmail.com" , "wens@csie.org" , "jernej.skrabec@gmail.com" , "samuel@sholland.org" , "jean-philippe@linaro.org" , "rafael@kernel.org" , "lenb@kernel.org" , "Liu, Yi L" , "cwabbott0@gmail.com" , "quic_pbrahma@quicinc.com" , "iommu@lists.linux.dev" , "linux-kernel@vger.kernel.org" , "asahi@lists.linux.dev" , "linux-arm-kernel@lists.infradead.org" , "linux-arm-msm@vger.kernel.org" , "linux-samsung-soc@vger.kernel.org" , "linux-mediatek@lists.infradead.org" , "linux-riscv@lists.infradead.org" , "linux-rockchip@lists.infradead.org" , "linux-s390@vger.kernel.org" , "linux-sunxi@lists.linux.dev" , "linux-tegra@vger.kernel.org" , "virtualization@lists.linux.dev" , "linux-acpi@vger.kernel.org" , "linux-pci@vger.kernel.org" , "patches@lists.linux.dev" , "Sethi, Vikram" , "helgaas@kernel.org" , "etzhao1900@gmail.com" Subject: Re: [PATCH v4 6/7] iommu: Introduce iommu_dev_reset_prepare() and iommu_dev_reset_done() Message-ID: References: <0f6021b500c74db33af8118210dd7a2b2fd31b3c.1756682135.git.nicolinc@nvidia.com> Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SN1PEPF0002529F:EE_|CH1PPF4C9628624:EE_ X-MS-Office365-Filtering-Correlation-Id: 9ea5e492-fda6-4cfb-fe5c-08ddfa0fd47a X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|376014|82310400026|36860700013|1800799024; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?ZBp2iPgKLaVqUipOWDYd/uahSr20F34zUA18MxEmr8eKFUh0whf0exxHuuw0?= =?us-ascii?Q?M9Zvu0/ivVeydZG+wgKL8XBgbqCZWrptldEMJKyTIP3aRxqfTfVpKinRiOfz?= =?us-ascii?Q?XIoPVOtKf/YW3LkAui0MNiksK0Jp5ztvX6J+JJwKnvyvGFntwEWIytJj6VFd?= =?us-ascii?Q?+r7v1KEujJcxWPD2P+W/4Z09CyDvjaNiHBQTL+dd/m8qlfKPBcxHObTBLjCZ?= =?us-ascii?Q?wQXkTzyDS53cbgbVN2N6HBr+PVGcChq6FqQm6qTFJjZaEah/uv0q/JbGBaAa?= =?us-ascii?Q?0JsWocnu8C17uscswJab7SusPdhZ0O6jdCZT8KqEwGIHnxpimxjX0JtRoCmt?= =?us-ascii?Q?PtrcZDqOoNqXecC30uBButoO5ZOswrhNGrl/Cp7ad8pe9VLnOWxIKdiEhi7p?= =?us-ascii?Q?YtWXONkzan19oWeiS+kekqelrykik7zyWkKMFp1pmm/+7fGoBzooSJ48/6qH?= =?us-ascii?Q?CYiqM7yuXhz5kJe6MTjIh7jE1Ue2Wb1rLtybp8F/vjQUK4Fob/92YqcLqWyF?= =?us-ascii?Q?Xmae/D8NxoCHfek1aowhj3QcqtLtYDIBubIHzDZEUm0N8VvS8Lm+Ca+t+LZe?= =?us-ascii?Q?bf75kaDTjwzVtz8evUYIp9ClMgCOlZ/XO+2ZAxala+P/7KV9HYx7gMxFNei/?= =?us-ascii?Q?BT9Lcp+bNXx8Hx2NFM05cYREZHnc7pDxlXQ0i39tbjPwLVtZgzUgHjmeMCjp?= =?us-ascii?Q?xL79I8PhY0EA2Q1gdggqRtfiILI/uaVknAiqsk2tz6KSRhqduMBgNbz8f5VZ?= =?us-ascii?Q?VWgQtw3OwIPoJgs31qXjGvcShVtB43GvfAme4oeUF6ySV8Ttn4BrDdZ3jB4H?= =?us-ascii?Q?+sQ3VAANPcmO8VO5BjtNhn5K9Qb5mFb6iDf/LhQuwBac7ty9LX9cXTEpdGhW?= =?us-ascii?Q?mISMfJ2MulVIv6pXM5oIWlY5eFZmPa2muyeHToryjD3QPjOVtIY6CQTJnD4l?= =?us-ascii?Q?jzxvN8eX0m7BS5Uxz69C21FNyXnTWKIge86snSfz9spLUrUh9vyybaIC/AlD?= =?us-ascii?Q?zslj0ouRoYXj0RXVLj3K5/JzSQbZ7alNsFdc+nW7IYlEeXxvTBOSrfYI9Nbe?= =?us-ascii?Q?OmTV4l4TE6JSJFhYZU5SB/ql8yr9uk2SCWm6qbRCMCByBxvlFD7/fncoyr84?= =?us-ascii?Q?mQ/+gHaF9Kqf4RzvWzH5rPIelNu8ZMAlyZj1JP2QDFBYv3ebwZSOHsfVP2DV?= =?us-ascii?Q?05Um3v9bsUBcy+GP+xpViLq1atdCspH2ArfJRK/u54qb5xKpi6iN8xbn5psa?= =?us-ascii?Q?ZzJAOEf/TfyUgWtxqWK8/unq1JjThTbJUdbXbUtD9hoQ5ZXmHPwLrSsxuZbx?= =?us-ascii?Q?FNUrkX1qjMM/U7FDMvxrE3cqDeeHNLzHONm+9KaLVZ5Ux1U3JKyIUas4BSMT?= =?us-ascii?Q?ZQYtJi+qXxYFi/e5NwQ6jOm2YFewhSYTKI4jJtEQ2EgYH3sFAUJ4rh8/qtWW?= =?us-ascii?Q?Tg1IhKw+QmXLoGSqicfx2HT6h7/GS5hlvDPTPrMRjxLkrXGZb5kr3BRHpdCm?= =?us-ascii?Q?s575dz/ejljm4wg4WkZzIA1tGoGoKtMUcU+G?= X-Forefront-Antispam-Report: CIP:216.228.117.160;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge1.nvidia.com;CAT:NONE;SFS:(13230040)(7416014)(376014)(82310400026)(36860700013)(1800799024);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 22 Sep 2025 19:40:05.1641 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 9ea5e492-fda6-4cfb-fe5c-08ddfa0fd47a X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: SN1PEPF0002529F.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH1PPF4C9628624 On Fri, Sep 12, 2025 at 09:49:13AM +0000, Tian, Kevin wrote: > given it impacts uAPI: > > - now attach/replace can be done anytime > - with this series attach/replace is rejected when a device is being reset > - later with compat testing ops attach/replace can be done again at > any time > > we should be cautious here, especially if this series goes into 6.18 (likely > the next LTS version) the interim behavior change may last long. yes > we discussed that no know usage would want to do attach/replace > while a device is being reset, but I wonder whether we should instead > wait for a full solution to avoid unnecessary uAPI change back-and-forth... That's a very fair point. To keep the uAPI consistent: I will split the series, making a smaller preparatory one, as a part-1 for release_domain and old_domain. Part-2 will roll out a can_attach op across drivers. And part-3 should have the final reset patches. Thanks Nicolin