I have successfully reactivated Windows using the Windows XP Confirmation ID Keygen from https://github.com/Endermanch/XPConfirmationIDKeygen

Red Hat's VirtIO driver 0.1.132 (2017) appears to be the last supporting Windows XP; I was able to get QXL graphics and a few other bits & pieces (VirtIO Balloon, VirtIO Serial) working with it. Distributed by Fedora here: https://fedorapeople.org/groups/virt/virtio-win/direct-downloads/archive ...

Registered here to say that after spending a few hours trying to convert a Windows XP VirtualBox VM to run under libvirt/qemu what worked for me was to boot it up in VirtualBox one last time and merging this registry file , which contains: Windows Registry Editor Version 5.00 [HKEY_LOCAL_MACHINE ...