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To enable nested virtualization for AMD processors:
. Shut down all running VMs and unload the `kvm_amd` module:
+
----
sudo modprobe -r kvm_amd
Activate the nesting feature:
sudo modprobe kvm_amd nested=1
----
. Nested virtualization is enabled until the host is rebooted. To enable it permanently, add the following line to the `/etc/modprobe.d/kvm.conf` file:
+
options kvm_amd nested=1
// ===========================================
// include::{partialsdir}/proc_configuring-nested-virtualization-in-virt-manager.adoc[leveloffset=+1]
// ===========================================
// [[proc_configuring-nested-virtualization-in-virt-manager]]
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). + NOTE: Using host-passthrough is not recommended for general usage. It should only be used for nested virtualization purposes. + . Click *Apply*.
// =========================================== // include::{partialsdir}/proc_testing-nested-virtualization.adoc[leveloffset=+1] // =========================================== // [[proc_testing-nested-virtualization]]
Testing nested virtualization
. Start the virtual machine. . On the virtual machine, run: +
sudo dnf group install virtualization
+
. Verify that the virtual machine has virtualization correctly set up:
+
sudo virt-host-validate
QEMU: Checking for hardware virtualization : PASS
QEMU: Checking if device /dev/kvm exists : PASS
QEMU: Checking if device /dev/kvm is accessible : PASS
QEMU: Checking if device /dev/vhost-net exists : PASS
QEMU: Checking if device /dev/net/tun exists : PASS
...
Additional resources
* https://bugzilla.redhat.com/show_bug.cgi?id=1055002
* https://kashyapc.wordpress.com/2012/01/14/nested-virtualization-with-kvm-intel/
* https://kashyapc.wordpress.com/2012/01/18/nested-virtualization-with-kvm-and-amd/

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sudo virt-host-validate
QEMU: Checking for hardware virtualization : PASS
QEMU: Checking if device /dev/kvm exists : PASS
QEMU: Checking if device /dev/kvm is accessible : PASS
QEMU: Checking if device /dev/vhost-net exists : PASS
QEMU: Checking if device /dev/net/tun exists : PASS
...
sudo virt-host-validate
QEMU: Checking for hardware virtualization : PASS
QEMU: Checking if device /dev/kvm exists : PASS
QEMU: Checking if device /dev/kvm is accessible : PASS
QEMU: Checking if device /dev/vhost-net exists : PASS
QEMU: Checking if device /dev/net/tun exists : PASS
...
a year ago
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Source string description
type: Plain text
Flags
no-wrap, read-only
Source string location
./pages/using-nested-virtualization-in-kvm.adoc:114
String age
a year ago
Last updated
a year ago
Source string age
a year ago
Translation file
pot/master/pages/using-nested-virtualization-in-kvm.pot, string 31