KVM : Nested KVM

Jeffery Bagirimvano

• 1 min read

If you want to create virtual machines as nested KVM on KVM host:

  1. Enable the setting for Nested KVM.
# show the current setting ( if the result is [Y], it's OK )
root@localhost:~# cat /sys/module/kvm_intel/parameters/nested 
Y
# if the result is [N], change like follows and reboot the system )
root@localhost:~# echo 'options kvm_intel nested=1' >> /etc/modprobe.d/qemu-system-x86.conf

2. Edit configuration of an existing virtual machine you'd like to set Nested like:

# edit config of a VM [ubuntu1804]
root@localhost:~# virsh edit ubuntu1804
# change [cpu mode] like follows
<cpu mode='host-passthrough'>

ref: https://www.server-world.info/en/note?os=Ubuntu_18.04&p=kvm&f=8