| 1 | <?xml version='1.0' encoding='UTF-8'?>
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| 2 | <!DOCTYPE topic PUBLIC "-//OASIS//DTD DITA Topic//EN" "topic.dtd">
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| 3 | <topic xml:lang="en-us" id="nested-virt">
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| 4 | <title>Nested Virtualization</title>
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| 5 |
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| 6 | <body>
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| 7 | <p>
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| 8 | <ph conkeyref="vbox-conkeyref-phrases/product-name"/> supports <i>nested
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| 9 | virtualization</i>. This feature enables the passthrough of
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| 10 | hardware virtualization functions to the guest VM. That means that
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| 11 | you can install a hypervisor, such as <ph conkeyref="vbox-conkeyref-phrases/product-name"/>, Oracle VM
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| 12 | Server or KVM, on an <ph conkeyref="vbox-conkeyref-phrases/product-name"/> guest. You can then create and
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| 13 | run VMs within the guest VM.
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| 14 | </p>
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| 15 | <p>
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| 16 | Hardware virtualization features not present on the host CPU will
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| 17 | not be exposed to the guest. In addition, some features such as
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| 18 | nested paging are not yet supported for passthrough to the guest.
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| 19 | </p>
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| 20 | <p>
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| 21 | You can enable the nested virtualization feature in one of the
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| 22 | following ways:
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| 23 | </p>
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| 24 | <ul>
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| 25 | <li>
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| 26 | <p>
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| 27 | From <ph conkeyref="vbox-conkeyref-phrases/vbox-mgr"/>, select the <b outputclass="bold">Enable
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| 28 | Nested VT-x/AMD-V</b> check box on the
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| 29 | <b outputclass="bold">Processor</b> tab. To disable the
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| 30 | feature, deselect the check box.
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| 31 | </p>
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| 32 | </li>
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| 33 | <li>
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| 34 | <p>
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| 35 | Use the <codeph>--nested-hw-virt</codeph> option of the <userinput>VBoxManage
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| 36 | modifyvm</userinput> command to enable or disable nested virtualization. See
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| 37 | <xref href="vboxmanage-modifyvm.dita">VBoxManage modifyvm</xref>.
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| 38 | </p>
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| 39 | </li>
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| 40 | </ul>
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| 41 | </body>
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| 42 |
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| 43 | </topic>
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