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Virtualization: Guest in guest?

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

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marked as duplicate by Shane Madden, Chris S, Iain, sysadmin1138 Sep 29 '11 at 17:56

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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? – Jason Taylor Sep 29 '11 at 17:31
2 words: VM Inception! – TylerShads Sep 29 '11 at 17:40

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 '11 at 17:02

esxi 4.1 can virtualize itself.

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As can Linux's KVM.… – sciurus Sep 29 '11 at 18:01

Yes it is known a nested virtualization. Here is a paper on same 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.

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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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