• In WSL2 run:

sudo apt update
sudo apt install qemu qemu-kvm bridge-utils cpu-checker
sudo apt install virt-manager
sudo addgroup kvm
sudo usermod -a -G kvm ${USER}

• Change the default group of /dev/kvm:

sudo nano /etc/wsl.conf

In the file /etc/wsl.conf add these lines:

[boot]
command = /bin/bash -c 'chown -v root:kvm /dev/kvm && chmod 660 /dev/kvm'

• Enable nested virtualization. Create .wslcongfig.

• Add this section to the .wslconfig file

[wsl2]
nestedVirtualization=true

• Restart WSL:

wsl.exe --shutdown

• Got an error:

Setting up udev (252.22-1~deb12u1) ...
addgroup: The group `kvm' already exists and is not a system group. Exiting.
dpkg: error processing package udev (--configure):
 installed udev package post-installation script subprocess returned error exit status 1
dpkg: dependency problems prevent configuration of mdevctl:
 mdevctl depends on udev; however:
  Package udev is not configured yet.

• It can be fixed with:

 sudo mv /var/lib/dpkg/info/udev.postinst /var/lib/dpkg/info/udev.postinst.backup