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+What: /sys/bus/vmbus/devices/vmbus_*/id
+Date: Jul 2009
+KernelVersion: 2.6.31
+Contact: K. Y. Srinivasan <kys@microsoft.com>
+Description: The VMBus child_relid of the device's primary channel
+Users: tools/hv/lsvmbus
+
+What: /sys/bus/vmbus/devices/vmbus_*/class_id
+Date: Jul 2009
+KernelVersion: 2.6.31
+Contact: K. Y. Srinivasan <kys@microsoft.com>
+Description: The VMBus interface type GUID of the device
+Users: tools/hv/lsvmbus
+
+What: /sys/bus/vmbus/devices/vmbus_*/device_id
+Date: Jul 2009
+KernelVersion: 2.6.31
+Contact: K. Y. Srinivasan <kys@microsoft.com>
+Description: The VMBus interface instance GUID of the device
+Users: tools/hv/lsvmbus
+
+What: /sys/bus/vmbus/devices/vmbus_*/channel_vp_mapping
+Date: Jul 2015
+KernelVersion: 4.2.0
+Contact: K. Y. Srinivasan <kys@microsoft.com>
+Description: The mapping of which primary/sub channels are bound to which
+ Virtual Processors.
+ Format: <channel's child_relid:the bound cpu's number>
+Users: tools/hv/lsvmbus