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
