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I have a Ubuntu 16.04 VPS right now. The hostisng provider uses KVM for virtualization of their VPS'. I am trying to install another KVM virtual machine on my VPS (aka nested KVMs). I've read this short guide for how to enable it:

https://www.linux-kvm.org/page/Nested_Guests

Apparently all I need to do to enable nested KVM instances is apply this flag at bootup of my purchased VPS:

-cpu host

So my question is, how can I set a bootup flag? Edit a config file for the bootup related stuff, or pass a parameter to the reboot command?

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  • This requires assistance from the VPS provider. In particular they need to load kvm-intel or kvm-amd modules, and they control the -cpu flag that starts your VPS. Commented Apr 7, 2019 at 12:25
  • I see. Ok that is interesting because I spoke to them earlier with the same question, and they simply told me it could be done and provided me the guide I have. So I kinda assumed that the rest could be taken care of on my end. But Okay, I'll contact them. Thank you. Commented Apr 7, 2019 at 12:34
  • They may already have done those parts :-) Commented Apr 7, 2019 at 13:10
  • Ya based on my convo yesterday, it seems they had updated the config file for their specific CPU aka adding options kvm-intel nested=Y in /etc/modprobe.d/kvm_intel.conf. So they'll just need to add the flag. Commented Apr 7, 2019 at 13:16

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