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<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE topic PUBLIC "-//OASIS//DTD DITA Topic//EN" "topic.dtd">
<topic xml:lang="en-us" id="nested-virt">
<title>Nested Virtualization</title>
<body>
<p><ph conkeyref="vbox-conkeyref-phrases/product-name"/> supports <i>nested virtualization</i>. This feature enables
the passthrough of hardware virtualization functions to the guest VM. That means that you can install a
hypervisor, such as <ph conkeyref="vbox-conkeyref-phrases/product-name"/>, Oracle VM Server or KVM, on an <ph
conkeyref="vbox-conkeyref-phrases/product-name"/> guest. You can then create and run VMs within the guest VM. </p>
<p>Hardware virtualization features not present on the host CPU will not be exposed to the guest. In addition, some
features such as nested paging are not yet supported for passthrough to the guest. </p>
<p>You can enable the nested virtualization feature in one of the following ways: </p>
<ul>
<li>
<p>From <ph conkeyref="vbox-conkeyref-phrases/vbox-mgr"/>, select the <b outputclass="bold">Enable Nested
VT-x/AMD-V</b> check box on the <b outputclass="bold">Processor</b> tab. To disable the feature, deselect
the check box. </p>
</li>
<li>
<p>Use the <codeph>--nested-hw-virt</codeph> option of the <userinput>VBoxManage modifyvm</userinput> command to
enable or disable nested virtualization. See <xref href="vboxmanage-modifyvm.dita">VBoxManage modifyvm</xref>. </p>
</li>
</ul>
</body>
</topic>
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