Ubuntu 15.04
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Nested KVM
2015/05/12
 
Configure nested KVM. It's possible to install KVM and create virtual machines as nested KVM on KVM host.
[1] Make sure the current settings for Nested KVM and change it if needed.
# show the current setting ( if the result is "Y", it's OK )

root@dlp:~#
cat /sys/module/kvm_intel/parameters/nested

Y
# if the result is "N", change like follows and reboot the system )

root@dlp:~#
echo 'options kvm_intel nested=1' >> /etc/modprobe.d/qemu-system-x86.conf
[2] Make sure the CPU model on your computer.
root@dlp:~#
virsh capabilities | egrep "/model|/vendor"

<model>SandyBridge</model>
# CPU model

<vendor>Intel</vendor>
# CPU vendor

<model>none</model>
<model>dac</model>
[3] Edit the configuration of a virtual machine you'd like to nest like follows. It's OK to configure nested KVM and you can create virtual machines on the virtual machine nested.
# edit a virtual machine "debian8"

root@dlp:~#
virsh edit debian8
# add following lines

<cpu mode='custom' match='exact'>
 
# CPU model

  <model fallback='allow'>SandyBridge</model>
 
# CPU vendor

  <vendor>Intel</vendor>
  <feature policy='require' name='vmx'/>
</cpu>
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