https://www.qubes-os.org/doc/windows-vm/
https://www.qubes-os.org/doc/hvm/
At the second link, at "Creating an HVM domain" "R4.0"m I got this error message "libvirt.libvirtError: invalid argument: could not find capabilities for arch=x86_64".
I have a Fujitsu Lifebook AH531 AKC3Y BLACK 7.