[Fedora-xen] Guest Image File Size

virt-install has a checkbox which suggests that you can avoid preallocating the entire guest image size -- that the guest image file will grow on demand. Does this work for Xen or is it only supported for KVM and the QEMU COW files? My experience when creating Xen guests as regular files is that I end up with a file that is the full size even when I pick the option to not preallocate the entire image. -- Thanks, Aaron