From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from SJ2PR03CU001.outbound.protection.outlook.com (mail-westusazon11012060.outbound.protection.outlook.com [52.101.43.60]) (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 C12A63D25AD; Mon, 14 Sep 2026 11:36:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=52.101.43.60 ARC-Seal:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789385815; cv=fail; b=FX24SbzE/PxLGGQZF/Ihtr5+1KZPeA4+bRoY+VLwHwksk+He/ZZ4wP3unJ2YFkxkA/XbNtkGYenuxAc4GNrwfIjIhimxBy1kSs80wKvNpFc+yqZoQpHU6vikM/MxYRV2KH7AEUPbVH1i2KEXBrt6JR+g663Ad2gV1UU6a2D43Bk= ARC-Message-Signature:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789385815; c=relaxed/simple; bh=mh9owyqu3CtrGsD6/bY0i9M7a++ggwgWBVmo3grtueM=; h=Date:From:To:Cc:Subject:Message-ID:References:Content-Type: Content-Disposition:In-Reply-To:MIME-Version; b=jBan7NDDPiTd0gQUG0m01ciLaMp7HBPvwggv6JdEQiIkiJ3AGjorWCkv3RX5fHQVzUMZ+lXCLCb8jZejOwCXyqVnBMIsN0dpjwvW5f/UErsZ5LQqxMea4/FdDSjk+b8io86He0WCwbK+rlsUUqj/ZE9M657lmGYBN2xbLKxEYF4= 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=V1SK+GL+; arc=fail smtp.client-ip=52.101.43.60 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="V1SK+GL+" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=cxWhjpCTlJwEIfYBHyec5ctwKsIYOpq4hA6redTheeRZhIN7TjDJPE2Z3FVb7ny5AZv1O5aG4uAiosVQnBVMc0FIysim9L4XStPmlfwuq4uJnCgMnAFjPMpIYi4zkTi4B0VaJKAVPMK+Tt8gjAVDHWF6ZRBSgyUlj1jws9dK1QQL4R/VsjUJMsPVwF0FIY6PrllhY1fQWaJgIO8+DWXRqkOXnxKT3rw8EW2GNy3ZWrjNiXQ8sa2h+m+pmqqcXKmx9lm8BP/Sy4f5EmHo6AttBGzHX35H3HJIyjqIkV1jTgMBP0nv7sNoEWKW4lkBTN5uXd686TAl01HjxIrTKaYT3g== 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=iY/hoRbE1YhznKlh84wKbluNpyGA7bcAzLp5ss6Rl+A=; b=iIIbf7RA2hvO4Oe+kiXHBQXyfgia0RoPF3tlussZMCOYIFoX+r9pRbk7XbkL7FBmDjIuZx8or3T4tGlMi00H/y+9CbV8ZxoCL4LdLYn5+lD8Deot68jBYvQnI5+v0CgNcIpUBAhwdZpmF1tdb/UxhWc0BA2/O5/fFoWkt7XOEckIyBeGjuVlloI+QOHofNKFXK3BMV2VJ0ysNtclpgBHV44bgfE5HyK0tcFqikMhVOmNZWMZkEdGjTbAS8rFBI2xH2rllUhNjUQ7QwWUr/KDnj/DQ1ih+g8dPciskMpxnxyhMwtxA3HJEkyXPXchBI8TK+ItTX2jpK1bLHhG8nEK/Q== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=nvidia.com; dmarc=pass action=none header.from=nvidia.com; dkim=pass header.d=nvidia.com; arc=none 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=iY/hoRbE1YhznKlh84wKbluNpyGA7bcAzLp5ss6Rl+A=; b=V1SK+GL+Qfm5YYb/qsUoRpuBOwIojFDjoiV0wJxmFr+fb8w3QFlkrIES2bq3VkY9TE/kQle6OcEIpGGJEbmYyRfGzSR1/QHixgF5FqJUZLiHCe8iajUsnFrWgw44ibpBZ9rxUgQIet2CSu0pYXfneGJ0XmiIhvcQtWQiM0gZeg85HqBzPnybs92zhS/yRxmOjx9KedT9L6can3JP9Qvl1dycUOEHSjWb1Ddhdfkmx7XK5SjJzKYO6ijPD0R93oOJz0KzFz9kmaohfv3k6uJLxeh7KfbgIhqq6BSdGfHbMH12Mb9Rb3QhJyJo37CZW5kUeRWYDZQJ2ARLRl0bxFDH+w== Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=nvidia.com; Received: from CHBPR12MB731189.namprd12.prod.outlook.com (2603:10b6:610:33d::12) by AT6PR12MB484643.namprd12.prod.outlook.com (2603:10b6:170:111::9) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.406.12; Mon, 14 Sep 2026 11:36:48 +0000 Received: from CHBPR12MB731189.namprd12.prod.outlook.com ([fe80::b0e5:123d:fe06:e10d]) by CHBPR12MB731189.namprd12.prod.outlook.com ([fe80::b0e5:123d:fe06:e10d%6]) with mapi id 15.21.0406.007; Mon, 14 Sep 2026 11:36:48 +0000 Date: Mon, 14 Sep 2026 08:36:47 -0300 From: Jason Gunthorpe To: Leon Romanovsky Cc: Matt Evans , Alex Williamson , Alex Mastro , Christian =?utf-8?B?S8O2bmln?= , Bjorn Helgaas , Logan Gunthorpe , Kevin Tian , Pranjal Shrivastava , Longfang Liu , Mahmoud Adam , David Matlack , =?utf-8?B?QmrDtnJuIFTDtnBlbA==?= , Sumit Semwal , Ankit Agrawal , Alistair Popple , Vivek Kasireddy , linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, kvm@vger.kernel.org, linux-pci@vger.kernel.org Subject: Re: [PATCH v6 9/9] vfio/pci: Permanently revoke a DMABUF on request Message-ID: <20260914113647.GL3968357@nvidia.com> References: <20260911214200.33793-1-matt@ozlabs.org> <20260911214200.33793-10-matt@ozlabs.org> <20260913165244.GW13683@unreal> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260913165244.GW13683@unreal> X-ClientProxiedBy: YT4PR01CA0153.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:b01:ac::12) To CHBPR12MB731189.namprd12.prod.outlook.com (2603:10b6:610:33d::12) 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: CHBPR12MB731189:EE_|AT6PR12MB484643:EE_ X-MS-Office365-Filtering-Correlation-Id: 55f23397-e2ec-497e-9f7b-08df1254769b X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|376014|1800799024|366016|23010399003|10067099003|4143699003|22082099003|18002099003|56012099006|11063799006; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:CHBPR12MB731189.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(7416014)(376014)(1800799024)(366016)(23010399003)(10067099003)(4143699003)(22082099003)(18002099003)(56012099006)(11063799006);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?SwpYs3rYaId1BeyJBKt+iRuqWQtp6z1wSKHxt70VEPyV7kO2bSPq9NBalQ4q?= =?us-ascii?Q?C8colWWhxjUezZ+mXBxc+mP6Nrn0IlMH3hLasFht+XgoI4DH1UnRSR9ffkV8?= =?us-ascii?Q?AJRtGZqCz84VL8szs+WeWfu+ixMr1BratwJ+vkt3iWjI4biCQFuPNtyBlsPb?= =?us-ascii?Q?CGvTgFfvFEllr+d7+ZA33rzVBsHVQ3dOPR2URmGgTbsTsDNQfVOT9TNjPJQC?= =?us-ascii?Q?Biybq9ci0l5dyYKkrR4MFufg0SknDaDl1YcT82Rg+XTjNQFA3b++FDuTpCCG?= =?us-ascii?Q?weREUXN1pcKmim2DKzK2qTVD3PDaA8Wr0aRjZB31jTux7QbkvPEl5QtY3RX4?= =?us-ascii?Q?q1dnEXFQyU+tcWYlk1/5tGfuO/WMvcYODnX/GxfbQPjobzvjl6d0OOdZIDP9?= =?us-ascii?Q?9gK11+s9tapvkw78ZOWpWzfqEFVRnLkBJis1V1oBPmVekFB0DIUwKqL4gIty?= =?us-ascii?Q?0yssxH/Amr2lAA/mE8BOJp0VlT6K/93o+iUKET6cr7GTYPy3QweWUY0B1efz?= =?us-ascii?Q?Zp8grQUjbepo5F+FloEfYkaxoWLg6/kdHuHjXQp6+BgjVgweJ+1caNyunpoX?= =?us-ascii?Q?pbviKv6rbHVIBeMp7i2D4MEsw7rwYTPtESpcUJyDchZ96AqoHJyAvS3b3Z7C?= =?us-ascii?Q?5sT16/XNkQRd25rhgDTjejNoS3p4FgfoN2qmkeURDtWinW0KRNix/sx3vDpV?= =?us-ascii?Q?y10IkDsqeZVwTDscz4kPmxAo1TBejf2Ta28aQELBnfrd2I6tAJ+eFXDkqtJp?= =?us-ascii?Q?WRJJFwjakIC7nyLkI1SzMcX3Jp6vBA0zrJRcnQ6ynSoOq42x7WH01YFlKmMA?= =?us-ascii?Q?6VQOy3vjU681VxfzNUXcowcq9TEOvWI05LzBVsNwNqv2Xr5sDeM8rDkZ+XCA?= =?us-ascii?Q?uWMb72+D/+WsEIjrbsReDPK4XuymJLonWSnzR205978yrydxFzy9rGU20KT7?= =?us-ascii?Q?Jt+wJMYOEO3W8QE7tfkjY+kEg1peR5otNrKKgoC138WSqTgsJaCANhjyu0tf?= =?us-ascii?Q?HFVJfOkdqc5w/BhyK6pjCfrucT4jxlGn69RiUylvXmRIJ9Sv57MocsszcxNJ?= =?us-ascii?Q?o8L/a2XICMgWSHQs70/ozyCozdEtkgvw0K12V67DCieXDbJaCTspvTtYPnZI?= =?us-ascii?Q?Y5rd9JdejpjgU4I7/BcrijfzzXp/9DS70nnNbNQy009p3Lklh8zwhLd+Cy2f?= =?us-ascii?Q?YKKAM0gHTvIcRLmSQeAHmKD56FX6A1LsgDe22dmRfK7x3L6okLuLMTHWR5fJ?= =?us-ascii?Q?iuBD4DJbFB8Xjm/ylcOuwswPZQDSmcwV7vQGvcbdvzjaS67vuz/ThNt2SlFw?= =?us-ascii?Q?ksFRl+GIbtIhyzZ+seT04fjZNMdxAc9o+Bj+K4so7NhDo+gaZpCesM09Zpg9?= =?us-ascii?Q?izdbdqGd3vIpm1eQvCBNb7rbznZuTBZEgIITOos0cexsKf7oPzpu4boWSWou?= =?us-ascii?Q?zVlOFwA0hQcKMdS7itlxU5km4/pSAMSZjZOR5UkwQN0eBz7YniH8JEZvg3Vt?= =?us-ascii?Q?ec7Th+qOCgLV/srOUgBfe5+pyGMndYagFApGSbegOdDiCJcpM7OgaS3I67Ae?= =?us-ascii?Q?lm2Yi5fuau9Sa5W9t3W3l6fw+sd8OgSCeO9cDnzCfbTD0uHwFuj5tUqR9AUN?= =?us-ascii?Q?GsKbdBfxmxYtBm29d7Mpx6b1LL4oBh8ulOnH6cCxstjXyOMsQxlcgDdb9QOI?= =?us-ascii?Q?HuMv6I09CfVf68tNv8nNT1Jho+I5wZyii3rpBym98/tf6pJx?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 55f23397-e2ec-497e-9f7b-08df1254769b X-MS-Exchange-CrossTenant-AuthSource: CHBPR12MB731189.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 Sep 2026 11:36:48.7335 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: mJ9YQBRo28lNpLVdSTRmdCkgXe4wgoVTTv19fgwQXDL4APoHvA1gzoU4cNF01NmH X-MS-Exchange-Transport-CrossTenantHeadersStamped: AT6PR12MB484643 On Sun, Sep 13, 2026 at 07:52:44PM +0300, Leon Romanovsky wrote: > On Fri, Sep 11, 2026 at 10:41:57PM +0100, Matt Evans wrote: > > Expand the VFIO DMABUF revocation state to three states: > > Not revoked, temporarily revoked, and permanently revoked. > > The thing is that "temporarily revoked" is actually the standard > invalidate_mappings/move_notify mechanism of DMABUF, which wasn't good > for VFIO. I think temporarily revokes here means it is revoked from a dmabuf perspective Just that VFIO can make it's internal dmabuf work again, there won't be a notification to any importer or an expectation that something like iommufd will re-establish mapping automatically. This is principally a kernel self protection mechanism where the userspace was expected to have removed the dmabuf before issuing a reset/etc. If they didn't then the kernel plonks it and userspace gets a mess to clean up. Jason