RE: [PATCH v3 00/17] Add iommufd physical device operations for replace and alloc hwpt

From: Jason Gunthorpe jgg@nvidia.com Sent: Wednesday, March 22, 2023 3:15 AM

The implementation is complicated because we have to introduce some per-iommu_group memory in iommufd and redo how we think about multi- device groups to be more explicit. This solves all the locking problems in the prior attempts.

By tracking groups explicitly should we also move DMA ownership claim to be per group?