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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>