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+What: /sys/class/iommu/<iommu>/devices/
+Date: June 2014
+KernelVersion: 3.17
+Contact: Alex Williamson <alex.williamson@redhat.com>
+Description:
+ IOMMU drivers are able to link devices managed by a
+ given IOMMU here to allow association of IOMMU to
+ device.
+
+What: /sys/devices/.../iommu
+Date: June 2014
+KernelVersion: 3.17
+Contact: Alex Williamson <alex.williamson@redhat.com>
+Description:
+ IOMMU drivers are able to link the IOMMU for a
+ given device here to allow association of device to
+ IOMMU.