On Tue, Jun 03, 2025 at 11:47:33AM +0800, Xu Yilun wrote: > VFIO doesn't have enough information, but VFIO needs to know about > bound state. So comes the suggestion [1] that the VFIO uAPI, then VFIO > reach into iommufd for real bind. > > And my implementation [2] is: > > ioctl(vfio_cdev_fd, VFIO_DEVICE_TSM_BIND) > -> vfio_iommufd_tsm_bind() > -> iommufd_device_tsm_bind() > -> iommufd_vdevice_tsm_bind() > -> pci_tsm_bind() This doesn't work, logically you are binding the vdevice, not the idevice, the uapi should provide the vdevice id, which VFIO doesn't have. If you really need vfio involvement then you need callbacks, I think. Jason
