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Wed, 29 Sep 2021 05:30:26 +0000 From: "Tian, Kevin" To: David Gibson , "Liu, Yi L" CC: "alex.williamson@redhat.com" , "jgg@nvidia.com" , "hch@lst.de" , "jasowang@redhat.com" , "joro@8bytes.org" , "jean-philippe@linaro.org" , "parav@mellanox.com" , "lkml@metux.net" , "pbonzini@redhat.com" , "lushenming@huawei.com" , "eric.auger@redhat.com" , "corbet@lwn.net" , "Raj, Ashok" , "yi.l.liu@linux.intel.com" , "Tian, Jun J" , "Wu, Hao" , "Jiang, Dave" , "jacob.jun.pan@linux.intel.com" , "kwankhede@nvidia.com" , "robin.murphy@arm.com" , "kvm@vger.kernel.org" , "iommu@lists.linux-foundation.org" , "dwmw2@infradead.org" , "linux-kernel@vger.kernel.org" , "baolu.lu@linux.intel.com" , "nicolinc@nvidia.com" Subject: RE: [RFC 03/20] vfio: Add vfio_[un]register_device() Thread-Topic: [RFC 03/20] vfio: Add vfio_[un]register_device() Thread-Index: AQHXrSFwNP3/pIcrZ0iM9X/cSoy0lKu6XWSAgAArGtA= Date: Wed, 29 Sep 2021 05:30:26 +0000 Message-ID: References: <20210919063848.1476776-1-yi.l.liu@intel.com> <20210919063848.1476776-4-yi.l.liu@intel.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: gibson.dropbear.id.au; 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Wed, 29 Sep 2021 05:30:26 +0000 From: "Tian, Kevin" To: David Gibson , "Liu, Yi L" Subject: RE: [RFC 03/20] vfio: Add vfio_[un]register_device() Thread-Topic: [RFC 03/20] vfio: Add vfio_[un]register_device() Thread-Index: AQHXrSFwNP3/pIcrZ0iM9X/cSoy0lKu6XWSAgAArGtA= Date: Wed, 29 Sep 2021 05:30:26 +0000 Message-ID: References: <20210919063848.1476776-1-yi.l.liu@intel.com> <20210919063848.1476776-4-yi.l.liu@intel.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: gibson.dropbear.id.au; dkim=none (message not signed) header.d=none; gibson.dropbear.id.au; dmarc=none action=none header.from=intel.com; x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: d9b0f8a3-8c9f-4b98-cd02-08d9830a3e12 x-ms-traffictypediagnostic: BN9PR11MB5420: x-ld-processed: 46c98d88-e344-4ed4-8496-4ed7712e255d,ExtAddr x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:8273; x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" > From: David Gibson > Sent: Wednesday, September 29, 2021 10:44 AM > > > One alternative option is to arrange device nodes in sub-directories based > > on the device type. But doing so also adds one trouble to userspace. The > > current vfio uAPI is designed to have the user query device type via > > VFIO_DEVICE_GET_INFO after opening the device. With this option the user > > instead needs to figure out the device type before opening the device, to > > identify the sub-directory. > > Wouldn't this be up to the operator / configuration, rather than the > actual software though? I would assume that typically the VFIO > program would be pointed at a specific vfio device node file to use, > e.g. > my-vfio-prog -d /dev/vfio/pci/0000:0a:03.1 > > Or more generally, if you're expecting userspace to know a name in a > uniqu pattern, they can equally well know a "type/name" pair. > You are correct. Currently: -device, vfio-pci,host=DDDD:BB:DD.F -device, vfio-pci,sysfdev=/sys/bus/pci/devices/ DDDD:BB:DD.F -device, vfio-platform,sysdev=/sys/bus/platform/devices/PNP0103:00 above is definitely type/name information to find the related node. Actually even for Jason's proposal we still need such information to identify the sysfs path. Then I feel type-based sub-directory does work. Adding another link to sysfs sounds unnecessary now. But I'm not sure whether we still want to create /dev/vfio/devices/vfio0 thing and related udev rule thing that you pointed out in another mail. Jason? Thanks Kevin _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu