This project is for migrating from xenserver *.xva image to xen *.img image.
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Untar your xenserver image {{image}} with the command: tar -xvf {image}.xva. There are Ref:XX folder and ova.xml, where Ref:XX which contains 1MB size chunks of the image disk and ova.xml represents image spec.
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Then grab this handy utility and run it on your untared data, as an example: 
python xenmigrate.py –-convert=Ref:XX {image}.img
- If you'd like to convert {image}.imgto{image}.qcow2, you can run the command:
qemu-img convert -f raw -O qcow2 {image}.img {image}.qcow2