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-<table class="head">
- <tr>
- <td class="head-ltitle">VMGENC(4)</td>
- <td class="head-vol">Device Drivers Manual</td>
- <td class="head-rtitle">VMGENC(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">vmgenc</code> &#x2014; <span class="Nd">ACPI
- virtual machine generation ID counter</span></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
-<p class="Pp"><code class="Cd">device vmgenc</code></p>
-<p class="Pp">In <a class="Xr">loader.conf(5)</a>:
- <br/>
- <code class="Cd">vmgenc_load=&quot;YES&quot;</code></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
-<p class="Pp">The <code class="Nm">vmgenc</code> driver provides support for the
- Virtual Machine Generation ID, a 128-bit unique identifier exposed by the
- hypervisor via ACPI. The hypervisor changes this identifier whenever the
- virtual machine is cloned, restored from a snapshot, or otherwise
- duplicated.</p>
-<p class="Pp">When a generation ID change is detected, the
- <code class="Nm">vmgenc</code> driver feeds the new identifier into the
- kernel entropy pool via <a class="Xr">random(4)</a>, ensuring that
- duplicated virtual machines do not share cryptographic state. The driver
- also sends a <a class="Xr">devctl(4)</a> event and an internal kernel
- notification so that other subsystems can respond to the duplication.</p>
-<p class="Pp">The Virtual Machine Generation ID specification is supported by
- QEMU, VMware ESXi, Microsoft Hyper-V, and Xen.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SYSCTL_VARIABLES"><a class="permalink" href="#SYSCTL_VARIABLES">SYSCTL
- VARIABLES</a></h1>
-<p class="Pp">The following variable is available:</p>
-<dl class="Bl-tag">
- <dt id="dev.vmgenc._d.guid"><var class="Va">dev.vmgenc.%d.guid</var></dt>
- <dd>The current cached VM generation counter as a 128-bit value. This value is
- updated each time the hypervisor signals a generation change.</dd>
-</dl>
-</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">acpi(4)</a>, <a class="Xr">random(4)</a></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="HISTORY"><a class="permalink" href="#HISTORY">HISTORY</a></h1>
-<p class="Pp">The <code class="Nm">vmgenc</code> driver first appeared in
- <span class="Ux">FreeBSD 13.0</span>.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="AUTHORS"><a class="permalink" href="#AUTHORS">AUTHORS</a></h1>
-<p class="Pp">The <code class="Nm">vmgenc</code> driver was written by
- <span class="An">Conrad Meyer</span>
- &lt;<a class="Mt" href="mailto:cem@FreeBSD.org">cem@FreeBSD.org</a>&gt;.</p>
-<p class="Pp">This manual page was written by
- <br/>
- <span class="An">Christos Longros</span>
- &lt;<a class="Mt" href="mailto:chris.longros@gmail.com">chris.longros@gmail.com</a>&gt;.</p>
-</section>
-</div>
-<table class="foot">
- <tr>
- <td class="foot-date">March 21, 2026</td>
- <td class="foot-os">FreeBSD 15.0</td>
- </tr>
-</table>