When creating a new libvirt guest, virt-v2v would not disable caching for disks as is recommended.
Guests created by a virt-v2v used caching for their disks, unless explicitly disabled by the user after conversion.
virt-v2v now explicitly disables caching for all disks when creating a new libvirt guest.
Guests create by virt-v2v now have caching disabled for all disks. The user can enable it again if required after conversion.