An application for my car maintenance is available only on Windows platform. I used one of my old computer to run Linux KVM virtualization with Win11 virtual machine. I want to get rid off some old stuff, so decided to move the Win11 VM to my primary computer running QubesOS. For such case QubesOS provides Standalone type of qube. The process is quite simple but there are couple import details. The following procedure works only if the original VM has one disk.

Source: Converting VirtualBox VMs to Qubes HVMs, How to convert raw to iso without copying to dom0?

Start with VM image conversion into RAW format:

qemu-img convert -O raw <image>.qcow2 <image>.raw

Next, move the raw image to any existing AppVM qube. In my case, raw image size was 200GB, so I took a bit different approach. I kept raw image on my network drive and mount the folder to qube via sshfs.

sshfs <user>@<network_drive>:/path/to/folder <local_drive>

Now, create new Qube type of Standalone with template None and default networking qube. Configure size of "System storage max size" to the size of raw image (or a bit more). And now, identify the system storage (root) image on dom0:

cd /dev/qubes_dom0
ls *<name of standalone qube>-root
lrwxrwxrwx 1 root root 9 Jan 27 10:40 vm-<name of standalone qube>-root -> ../dm-21

So, actual root device used for standalone qube is /dev/dm-21.

And last step is to copy the raw image to this root device:

sudo -i
qvm-run -p <qube with mounted network drive> 'cat /path/to/mounted/drive/image.raw' > /dev/dm-21

Start the qube and voala...:-)