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Configuring nested virtualization in virt-manager
Configure your VM to use nested virtualization:
Open virt-manager, double-click the VM in which you wish to enable nested virtualization, and click the *Show virtual hardware details* icon.
Click *CPUs* in the side menu. In the *Configuration* section, there are two options - either type `host-passthrough` in the *Model:* field, or select the *Copy host CPU configuration* check box (that fills the `host-model` value in the *Model* field).
Using host-passthrough is not recommended for general usage. It should only be used for nested virtualization purposes.
Click *Apply*.