12.2. Setup

Enable: The feature is disabled by default. To enable it, use the following procedure on the L0 host physical machine.

For Intel:

Check whether nested virtualization is available on your host system.
```
cat /sys/module/kvm_intel/parameters/nested
```
```
$ cat /sys/module/kvm_intel/parameters/nested
```
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If this command returns Y or 1, the feature is enabled.
If the command returns 0 or N, use steps ii and iii.
Unload the kvm_intel module:
```
modprobe -r kvm_intel
```
```
# modprobe -r kvm_intel
```
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Activate the nesting feature:
```
modprobe kvm_intel nested=1
```
```
# modprobe kvm_intel nested=1
```
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The nesting feature is now enabled only until the next reboot of the L0 host. To enable it permanently, add the following line to the /etc/modprobe.d/kvm.conf file:
```
options kvm_intel nested=1
```
```
options kvm_intel nested=1
```
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For AMD:

Check whether nested virtualization is available on your system:
```
cat /sys/module/kvm_amd/parameters/nested
```
```
$ cat /sys/module/kvm_amd/parameters/nested
```
Copy to Clipboard Toggle word wrap
If this command returns Y or 1, the feature is enabled.
If the command returns 0 or N, use steps ii and iii.
Unload the kvm_amd module
```
modprobe -r kvm_amd
```
```
# modprobe -r kvm_amd
```
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Activate the nesting feature
```
modprobe kvm_amd nested=1
```
```
# modprobe kvm_amd nested=1
```
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The nesting feature is now enabled only until the next reboot of the L0 host. To enable it permanently, add the following line to the /etc/modprobe.d/kvm.conf file:
```
options kvm_amd nested=1
```
```
options kvm_amd nested=1
```
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Configure your L1 virtual machine for nested virtualization using one of the following methods:

virt-manager

Open the GUI of the intended guest and click the Show Virtual Hardware Details icon.
Select the Processor menu, and in the Configuration section, type host-passthrough in the Model field (do not use the drop-down selection), and click Apply.

View larger image

Domain XML

Add the following line to the domain XML file of the guest:

<cpu mode='host-passthrough'/>

<cpu mode='host-passthrough'/>

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If the guest's XML configuration file already contains a <cpu> element, rewrite it.

To start using nested virtualization, install an L2 guest within the L1 guest. To do this, follow the same procedure as when installing the L1 guest - see Chapter 3, Creating a Virtual Machine for more information.

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