KVM nesting on Debian 8

Turns out running KVM inside KVM performs acceptable. Here's what I had to to do give it a try.

check if nesting is enabled

cat /sys/module/kvm_intel/parameters/nested

should print: Y

if not you'll need to enable it (requires reboot to become effective)

sudo bash -c "echo 'options kvm_intel nested=1' >> /etc/modprobe.d/qemu-system-x86.conf"

next check if boot parameters correct

egrep 'KVM_INTEL|KVM_AMD' /boot/config-3.16.0-4-amd64

should return:


check if /dev/kvm exists, if not run:

sudo modprobe kvm-intel

That's it, your host system is now configured to do KVM nesting. Make sure to configure your libvirt/KVM guest VMs to allow using svm/mvx instruction sets.


written by uniq on 2017-02-18