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-<table class="head">
- <tr>
- <td class="head-ltitle">HYPER-V(4)</td>
- <td class="head-vol">Device Drivers Manual</td>
- <td class="head-rtitle">HYPER-V(4)</td>
- </tr>
-</table>
-<div class="manual-text">
-<section class="Sh">
-<h1 class="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
-<p class="Pp"><code class="Nm">hv_vmbus</code> &#x2014; <span class="Nd">Hyper-V
- Virtual Machine Bus (VMBus) Driver</span></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
-<p class="Pp">To compile this driver into the kernel, place the following lines
- in the system kernel configuration file:</p>
-<div class="Bd Pp Bd-indent"><code class="Cd">device hyperv</code>
-<br/>
-<code class="Cd">device pci</code></div>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
-<p class="Pp">The <code class="Nm">hv_vmbus</code> provides a high performance
- communication interface between guest and root partitions in Hyper-V.
- Hyper-V is a hypervisor-based virtualization technology from Microsoft.
- Hyper-V supports isolation in terms of a partition. A partition is a logical
- unit of isolation, supported by the hypervisor, in which operating systems
- execute.</p>
-<p class="Pp">The Microsoft hypervisor must have at least one parent, or root,
- partition, 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.</p>
-<p class="Pp">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.</p>
-<p class="Pp">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 redirect 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.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
- ALSO</a></h1>
-<p class="Pp"><a class="Xr">hv_netvsc(4)</a>, <a class="Xr">hv_storvsc(4)</a>,
- <a class="Xr">hv_utils(4)</a></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="HISTORY"><a class="permalink" href="#HISTORY">HISTORY</a></h1>
-<p class="Pp">Support for <code class="Nm">hv_vmbus</code> first appeared in
- <span class="Ux">FreeBSD 10.0</span>. The driver was developed through a
- joint effort between Citrix Incorporated, Microsoft Corporation, and Network
- Appliance Incorporated.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="AUTHORS"><a class="permalink" href="#AUTHORS">AUTHORS</a></h1>
-<p class="Pp"><span class="Ux">FreeBSD</span> support for
- <code class="Nm">hv_vmbus</code> was first added by
- <span class="An">Microsoft BSD Integration Services Team</span>
- &lt;<a class="Mt" href="mailto:bsdic@microsoft.com">bsdic@microsoft.com</a>&gt;.</p>
-</section>
-</div>
-<table class="foot">
- <tr>
- <td class="foot-date">September 10, 2013</td>
- <td class="foot-os">FreeBSD 15.0</td>
- </tr>
-</table>