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Mon, 14 Feb 2022 13:43:04 +0000 Date: Mon, 14 Feb 2022 09:43:03 -0400 To: Greg Kroah-Hartman Subject: Re: [PATCH v5 04/14] driver core: platform: Add driver dma ownership management Message-ID: <20220214134303.GA929467@nvidia.com> References: <20220104015644.2294354-1-baolu.lu@linux.intel.com> <20220104015644.2294354-5-baolu.lu@linux.intel.com> <20220214131853.GY4160@nvidia.com> Content-Disposition: inline In-Reply-To: X-ClientProxiedBy: MN2PR16CA0016.namprd16.prod.outlook.com (2603:10b6:208:134::29) To MN2PR12MB4192.namprd12.prod.outlook.com (2603:10b6:208:1d5::15) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: b1a356d3-eee0-44f6-6c6a-08d9efbfed0b X-MS-TrafficTypeDiagnostic: CH2PR12MB4199:EE_ X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:5236; X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On Mon, Feb 14, 2022 at 02:37:15PM +0100, Greg Kroah-Hartman wrote: > On Mon, Feb 14, 2022 at 09:18:53AM -0400, Jason Gunthorpe wrote: > > On Mon, Feb 14, 2022 at 10:59:50AM +0100, Greg Kroah-Hartman wrote: > > > > > > + if (ret && !drv->no_kernel_api_dma) > > > > + iommu_device_unuse_dma_api(dev); > > > > > > So you are now going to call this for every platform driver _unless_ > > > they set this flag? > > > > Yes, it is necessary because VFIO supports platform devices as well > > and needs to ensure security. Conflicting kernel driver attachements > > must be blocked, just like for PCI. > > A platform device shouldn't be using VFIO, but ugh, oh well, that ship > has sailed :( I don't know why you say that, but yes, this is was set long ago. > And stop it with the "security" mess, do not give people a false sense > of it here please. I'm confused by what you mean. This is all about what we tend to refer to as DMA security - meaning a device's DMA can be controled by a hostile environment and not impact the integrity of the kernel. Jason _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu