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Last active April 23, 2025 09:37
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Enable nested virtualization in KVM
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nestedvirtkvm.md

Enable nested virtualization in KVM

For those times when you need to run virtualization (e.g. vagrant with VirtualBox) inside a KVM (libvirtd) guest.

The following taken from Enabling nested virtualization in KVM over on Fedora Docs.

  1. Make sure that the Intel-VT-x/AMD-V extensions are enabled in the host machine's BIOS. For Intel:
$ cat /proc/cpuinfo | grep vmx

For AMD:

$ cat /proc/cpuinfo | grep svm
  1. Check to see if /etc/modprobe.d/qemu-system-x86.conf exists and if it does not have the following line, add it and reboot:
options kvm_intel nested=1

  1. Go into the graphical virt-manager, open the subject guest's config, and click on "CPUs".

  2. Check the box "Copy host CPU configuration" and Apply.

  3. Restart the virtual machine, open a terminal in it and check for the extensions:

$ cat /proc/cpuinfo | grep vmx
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