My bad, it was a silently added "feature" in Windows driver[0]. [0] https://wiki.archlinux.org/index.php/PCI_passthrough_via_OVMF#%22Error_43:_Driver_failed_to

My bad, it was a silently added "feature" in Windows driver[0]. [0] https://wiki.archlinux.org/index.php/PCI_passthrough_via_OVMF#%22Error_43:_Driver_failed_to_load%22_on_Nvidia_GPUs_passed_to_Windows_VMs https://wiki.archlinux.org/index.php/PCI_passthrough_via_OVM...