On Thu, May 13, 2021 at 03:28:52AM +0000, Tian, Kevin wrote: > Are you specially concerned about this iommu_device hack which > directly connects mdev_device to iommu layer or the entire removed > logic including the aux domain concept? For the former we are now > following up the referred thread to find a clean way. But for the latter > we feel it's still necessary regardless of how iommu interface is redesigned > to support device connection from the upper level driver. The reason is > that with mdev or subdevice one physical device could be attached to > multiple domains now. there could be a primary domain with DOMAIN_ > DMA type for DMA_API use by parent driver itself, and multiple auxiliary > domains with DOMAIN_UNMANAGED types for subdevices assigned to > different VMs. Why do we need more domains than just the physical domain for the parent? How does auxdomain appear in /dev/ioasid? I never understood what this dead code was supposed to be used for. Jason
