Re: [PATCH 10/13] vfio: Make vfio_device_open() exclusive between group path and device cdev path

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Subject: Re: [PATCH 10/13] vfio: Make vfio_device_open() exclusive between group path and device cdev path
From: Jason Gunthorpe <jgg@xxxxxxxxxx>
Date: Mon, 6 Feb 2023 11:10:33 -0400
Cc: "Liu, Yi L" <yi.l.liu@xxxxxxxxx>, Alex Williamson <alex.williamson@xxxxxxxxxx>, "cohuck@xxxxxxxxxx" <cohuck@xxxxxxxxxx>, "eric.auger@xxxxxxxxxx" <eric.auger@xxxxxxxxxx>, "nicolinc@xxxxxxxxxx" <nicolinc@xxxxxxxxxx>, "kvm@xxxxxxxxxxxxxxx" <kvm@xxxxxxxxxxxxxxx>, "mjrosato@xxxxxxxxxxxxx" <mjrosato@xxxxxxxxxxxxx>, "chao.p.peng@xxxxxxxxxxxxxxx" <chao.p.peng@xxxxxxxxxxxxxxx>, "yi.y.sun@xxxxxxxxxxxxxxx" <yi.y.sun@xxxxxxxxxxxxxxx>, "peterx@xxxxxxxxxx" <peterx@xxxxxxxxxx>, "jasowang@xxxxxxxxxx" <jasowang@xxxxxxxxxx>, "suravee.suthikulpanit@xxxxxxx" <suravee.suthikulpanit@xxxxxxx>
In-reply-to: <BN9PR11MB527617553145A90FD72A66958CDA9@BN9PR11MB5276.namprd11.prod.outlook.com>
References: <20230117134942.101112-1-yi.l.liu@intel.com> <20230117134942.101112-11-yi.l.liu@intel.com> <20230119165157.5de95216.alex.williamson@redhat.com> <DS0PR11MB752933F8C5D72473FE9FF5EEC3D39@DS0PR11MB7529.namprd11.prod.outlook.com> <DS0PR11MB752960717017DFE7D2FB3AFBC3D69@DS0PR11MB7529.namprd11.prod.outlook.com> <Y91HQUFrY5jbwoHF@nvidia.com> <DS0PR11MB75291EFC06C5877AF01270CFC3DA9@DS0PR11MB7529.namprd11.prod.outlook.com> <BN9PR11MB527617553145A90FD72A66958CDA9@BN9PR11MB5276.namprd11.prod.outlook.com>

On Mon, Feb 06, 2023 at 10:09:52AM +0000, Tian, Kevin wrote:
> It's probably simpler if we always mark DMA owner with vfio_group
> for the group path, no matter vfio type1 or iommufd compat is used.
> This should avoid all the tricky corner cases between the two paths.

Yes

Jason

Follow-Ups:
- RE: [PATCH 10/13] vfio: Make vfio_device_open() exclusive between group path and device cdev path
  - From: Liu, Yi L

References:
- [PATCH 00/13] Add vfio_device cdev for iommufd support
  - From: Yi Liu
- [PATCH 10/13] vfio: Make vfio_device_open() exclusive between group path and device cdev path
  - From: Yi Liu
- Re: [PATCH 10/13] vfio: Make vfio_device_open() exclusive between group path and device cdev path
  - From: Alex Williamson
- RE: [PATCH 10/13] vfio: Make vfio_device_open() exclusive between group path and device cdev path
  - From: Liu, Yi L
- RE: [PATCH 10/13] vfio: Make vfio_device_open() exclusive between group path and device cdev path
  - From: Liu, Yi L
- Re: [PATCH 10/13] vfio: Make vfio_device_open() exclusive between group path and device cdev path
  - From: Jason Gunthorpe
- RE: [PATCH 10/13] vfio: Make vfio_device_open() exclusive between group path and device cdev path
  - From: Liu, Yi L
- RE: [PATCH 10/13] vfio: Make vfio_device_open() exclusive between group path and device cdev path
  - From: Tian, Kevin

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