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HYPER-V(4)	       FreeBSD Kernel Interfaces Manual		    HYPER-V(4)

     hv_vmbus -- Hyper-V Virtual Machine Bus (VMBus) Driver

     To	compile	this driver into the kernel, place the following lines in the
     system kernel configuration file:

	   device hyperv

     The hv_vmbus provides a high performance communication interface between
     guest and root partitions in Hyper-V.  Hyper-V is a hypervisor-based vir-
     tualization technology from Microsoft.  Hyper-V supports isolation	in
     terms of a	partition.  A partition	is a logical unit of isolation,	sup-
     ported by the hypervisor, in which	operating systems execute.

     The Microsoft hypervisor must have	at least one parent, or	root, parti-
     tion, running Windows Server operating system.  The virtualization	stack
     runs in the parent	partition and has direct access	to the hardware
     devices.  The root	partition then creates the child partitions which host
     the guest operating systems.

     Child partitions do not have direct access	to other hardware resources
     and are presented a virtual view of the resources,	as virtual devices
     (VDevs).  Requests	to the virtual devices are redirected either via the
     VMBus or the hypervisor to	the devices in the parent partition, which
     handles the requests.

     The VMBus is a logical inter-partition communication channel.  The	parent
     partition hosts Virtualization Service Providers (VSPs) which communicate
     over the VMBus to handle device access requests from child	partitions.
     Child partitions host Virtualization Service Consumers (VSCs) which redi-
     rect device requests to VSPs in the parent	partition via the VMBus.  The
     Hyper-V VMBus driver defines and implements the interface that facilitate
     high performance bi-directional communication between the VSCs and	VSPs.
     All VSCs utilize the VMBus	driver.

     hv_utils(4), hv_netvsc(4),	hv_storvsc(4), hv_ata_pci_disengage(4)

     Support for hv_vmbus first	appeared in FreeBSD 10.0.  The driver was
     developed through a joint effort between Citrix Incorporated, Microsoft
     Corporation, and Network Appliance	Incorporated.

     FreeBSD support for hv_vmbus was first added by Microsoft BSD Integration
     Services Team <>.

FreeBSD	10.3		      September	10, 2013		  FreeBSD 10.3


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