On Thu, Jun 23, 2022 at 01:23:05PM +0100, Robin Murphy wrote: > So yes, technically we could implement an iommu_group_capable() and an > iommu_group_domain_alloc(), which would still just internally resolve the > IOMMU ops and instance data from a member device to perform the driver-level > call, but once again it would be for the benefit of precisely one > user. Benefit one user and come with a fairly complex locking situation to boot. Alex, I'd rather think about moving the type 1 code so that the iommu attach happens during device FD creation (then we have a concrete non-fake device), not during group FD opening. That is the model we need for iommufd anyhow. Jason
