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Virtualization: Guest in guest?

Is it possible to run a virtual machine under a virtual machine ?

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  • I thought of this the other day. I wonder if you can measure the performance loss the deeper the VM's go. A VMware inside a Hyper-V inside a VMWare? Hmmm... inside virtualbox? Sep 29, 2011 at 17:31
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    2 words: VM Inception!
    – Tablemaker
    Sep 29, 2011 at 17:40

5 Answers 5

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Possibly, but not with ahrdware acceleration - the processor only has one ring 0. For the hyper-visor.

The sense of it is academic, though - it makes NO sense from an admin perspective.

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  • ...but Linux kernel 3.1 is going to add this functionality. With all the problems.
    – mailq
    Sep 29, 2011 at 17:02
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esxi 4.1 can virtualize itself.

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Yes it is known a nested virtualization. Here is a paper on same http://www.xen.org/files/xensummit_intel09/xensummit-nested-virt.pdf relative to Xen from Intel.

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Yes, it is possible with bare-metal hypervizors, and is very common for virtualization lab environments. Not generally recommended for production though.

http://www.vcritical.com/2009/05/vmware-esx-4-can-even-virtualize-itself/

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Sure. For some reason not long ago I was running QEMU as an ARM emulator inside Fedora inside VMWare Server on a Windows XP desktop.

It worked well enough.

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