IOMMU Event Tracing - What it is and how it can help your distro? http://events.linuxfoundation.org/sites/events/files/slides/iommu_tracing_feb23_2015.pdf IOMMU Event- IOMMU group class events . Add device to IOMMU group (add_device_to_group) . Remove device from IOMMU group (remove_device_from_group)- IOMMU device class events . Attach device to a domain . Detach device from a domain- IOMMU map..