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+What: /sys/.../<device>/vfio-dev/vfioX/
+Date: September 2022
+Contact: Yi Liu <yi.l.liu@intel.com>
+Description:
+ This directory is created when the device is bound to a
+ vfio driver. The layout under this directory matches what
+ exists for a standard 'struct device'. 'X' is a unique
+ index marking this device in vfio.