Requirement:
In the host (the one installed on hardware)
- use AMD cpu or very recent Intel one
- use kernel >= 3.10
- enable nested support
Check
to check if is enabled do ("kvm_amd" for AMD cpu, "kvm_intel" for intel)
root@hostname:~# cat /sys/module/kvm_intel/parameters/nested 0
0 means it's not, to enable ("kvm-amd" for amd, "kvm-intel" for intel):
# echo "options kvm-intel nested=1" > /etc/modprobe.d/kvm-intel.conf
and reboot or reload the kernel modul
modprobe -r kvm-intel modprobe kvm-intel
check again
root@hostname:~# cat /sys/module/kvm_intel/parameters/nested 1