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32 .Nd Hyper-V Virtual Machine Bus (VMBus) Driver
36 Alternatively, to load the driver as a
37 module at boot time, place the following line in
39 .Bd -literal -offset indent
45 provides a high performance communication interface between
46 guest and root partitions in Hyper-V.
47 Hyper-V is a hypervisor-based virtualization technology from Microsoft.
48 Hyper-V supports isolation in terms of a partition.
50 logical unit of isolation, supported by the hypervisor, in which
51 operating systems execute.
53 The Microsoft hypervisor must have at least one parent, or root,
54 partition, running Windows Server operating system.
55 The virtualization stack runs in the parent partition and has
56 direct access to the hardware devices.
57 The root partition then creates the child partitions which host
58 the guest operating systems.
60 Child partitions do not have direct access to other hardware resources
62 a virtual view of the resources, as virtual devices (VDevs).
63 Requests to the virtual devices are
64 redirected either via the VMBus or the hypervisor to the devices in
65 the parent partition, which handles the requests.
67 The VMBus is a logical inter-partition communication channel.
68 The parent partition hosts Virtualization Service Providers (VSPs)
69 which communicate over the VMBus to handle device access requests from
71 Child partitions host Virtualization Service
72 Consumers (VSCs) which redirect device requests to VSPs in the parent
73 partition via the VMBus.
74 The Hyper-V VMBus driver defines and implements
75 the interface that facilitate high performance bi-directional communication
76 between the VSCs and VSPs.
77 All VSCs utilize the VMBus driver.
79 .\".Xr hv_ata_pci_disengage 4 ,
88 and was subsequently brought into
90 The driver was developed through a joint effort between Citrix Incorporated,
91 Microsoft Corporation, and Network Appliance Incorporated.
98 .An Microsoft BSD Integration Services Team Aq Mt bsdic@microsoft.com .