Nested VMs

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henrym
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Nested VMs

Post by henrym » Thu Jul 04, 2019 2:16 pm

I have read that VMs can run inside VMs. I tried to install a VM of Tiny Core (just an experiment, and so I chose a small distro) inside my VM of Fedora 30, hosted on Mint. I got this message:
Virtualization extensions are unavailable on your system. Check your BIOS settings to enable them
Virtualization is enabled, or else I could not run a VM at all. I do not see another option in the BIOS. Is my CPU inadequate for the task?

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xenopeek
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Re: Nested VMs

Post by xenopeek » Thu Jul 04, 2019 2:27 pm

Assuming VirtualBox, you need a VirtualBox release 6 and an AMD CPU; this doesn't work on Intel or earlier VirtualBox releases. See: https://www.virtualbox.org/manual/ch09.html#nested-virt
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henrym
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Re: Nested VMs

Post by henrym » Thu Jul 04, 2019 2:30 pm

Ok. I have VB 6, but the host computer has an i5 CPU (from Intel). Next time I buy a laptop, I want it to be good at virtualization. It sounds like I will need an AMD to do nested VMs. Does Intel have any advantages over AMD regarding virtualization?

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xenopeek
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Re: Nested VMs

Post by xenopeek » Thu Jul 04, 2019 2:38 pm

Eventually VirtualBox should also support in on Intel. I don't know when.

What's the point of nested virtualization over parallel virtualization for you?
Perhaps another virtualization solution already supports it. I'm not familiar with other than VirtualBox.
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henrym
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Re: Nested VMs

Post by henrym » Thu Jul 04, 2019 2:40 pm

Just seeing what is possible as I learn VMs.

I would not buy a new laptop just to do nested VMs. However, when I get one, I want it to be good with VMs. Aside from nested VMs, is there any difference between AMD and Intel CPUs regarding VM options and performance?

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