quick-docs/en-US/modules/proc_enabling-nested-virtualization-in-kvm.adoc
2017-12-14 09:49:59 +05:30

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= Enabling nested virtualization in KVM
[[enabling-nested-virtualization-in-kvm]]
Nested virtualization allows you to run a virtual machine (VM) inside
another VM while still using hardware acceleration from the host.
== Checking if nested virtualization is supported
For Intel processors, check the `/sys/module/kvm_intel/parameters/nested` file. +
For AMD processors, check the `/sys/module/kvm_amd/parameters/nested` file. +
If you see `1` or `Y`,nested virtualization is supported; if you see `0` or `N`, nested virtualization is not supported.
For example:
....
$ cat /sys/module/kvm_intel/parameters/nested
Y
....
== Enabling nested virtualization
To enable nested virtualization for Intel processors:
. Shut down all running VMs and unload the `kvm_probe` module:
+
----
# modprobe -r kvm_intel
----
. Activate the nesting feature:
+
----
# modprobe kvm_intel 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_intel nested=1
----
To enable nested virtualization for AMD processors:
. Shut down all running VMs and unload the `kvm_amd` module:
+
----
# modprobe -r kvm_amd
----
. Activate the nesting feature:
+
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# 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
----