What: /sys/class/iommu//amd-iommu/cap Date: June 2014 KernelVersion: 3.17 Contact: Alex Williamson Description: IOMMU capability header as documented in the AMD IOMMU specification. Format: %x What: /sys/class/iommu//amd-iommu/features Date: June 2014 KernelVersion: 3.17 Contact: Alex Williamson Description: Extended features of the IOMMU. Format: %llx