| 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 id="ts-hyperv">
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| 4 | <title>Poor performance when using <ph conkeyref="vbox-conkeyref-phrases/product-name"/> and <b outputclass="bold">Hyper-V</b> on the same host</title>
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| 5 | <body>
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| 6 | <dl>
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| 7 | <dlentry>
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| 8 | <dt>Details</dt>
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| 9 | <dd><ph conkeyref="vbox-conkeyref-phrases/product-name"/> and <b outputclass="bold">Hyper-V</b> can conflict with each other when run on the same host.<p>Always disable Hyper-V when running VirtualBox.</p></dd>
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| 10 | </dlentry>
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| 11 | <dlentry>
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| 12 | <dt>Workaround</dt>
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| 13 | <dd>
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| 14 | <p>Turn off the Windows features Hyper-V Platform, Virtual Machine Platform and Windows Hypervisor Platform, and then reboot the host.</p>
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| 15 | <p>On newer Windows versions, the device security features Core Isolation and Memory Integrity use Hyper-V, even if you have turned it off.</p>
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| 16 | <p>Use the Microsoft Device Guard and Credential Guard hardware readiness tools to turn off more features that use Hyper-V. For example, to disable AutoReboot, use the following command: </p>
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| 17 | <pre xml:space="preserve">.\DG_Readiness_Tool_vX.X.ps1 -Disable -AutoReboot</pre>
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| 18 | <note>
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| 19 | <p>Disabling Device Guard and Credential Guard features impacts on the overall security of the host. Take this into account before deciding to disable them.</p>
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| 20 | </note>
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| 21 | </dd>
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| 22 | </dlentry>
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| 23 | </dl>
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| 24 | </body>
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| 25 | </topic>
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