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How To enable nested virtualization on AHV with CE 2.1

We attempted the following approaches to enable nested virtualization, but it still did not work.

Approach 1:
a. Created the VM and enabled cpu_passthrough=true before powering it on.
Observation: We were able to log in to Windows.

b. Enabled the Hyper-V feature inside the VM and restarted.
Observation: The system failed to log in and entered Recovery mode.

Approach 2:
a. Created the VM and enabled hardware_virtualization=true before powering it on.
Observation: We were able to log in to Windows.

b. Enabled the Hyper-V feature inside the VM and restarted.
Observation: We could log in, but the nested virtualization feature was disabled.

Please advise on how to enable nested virtualization in CE 2.1

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5 replies

JeroenTielen
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The cpu_passthrough=true is enough. Then nested virtualization is enabled.

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 cpu_passthrough=true is not working for CE 2.1 version .

JeroenTielen
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cpu_passtrough=true DOES work in CE 2.1. 

 

As you can see on the screenshot I have CE running with a virtual machine named Hyper-V Host. This machine only has cpu_passtrough=true set. (I set if before I installed windows in it). It has Hyper-V installed and it is running a gen-2 virtual machine. 

 

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    Thank you for your input and confirmation.

    I was using CE 2.1 with AHV version AHV-20230302.101026, where cpu_passthrough=true did not work. After updating to AHV10.0.1.1, cpu_passthrough=true is now functioning as expected.

    I would like to know if there are any limitations with cpu_passthrough=true, and whether it works with all the latest AHV versions.

    Do you have any information on why cpu_passthrough=true did not work with AHV-20230302.101026?

    I am trying to understand why cpu_passthrough=true only works with certain versions.

    Any insights would be appreciated. Thank you in advance for your help.

    JeroenTielen
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    For that question you should ask support (if you have a support contract). I assume it all has to do with the underlying hardware., 

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