convert VM from virtualbox to kvm (qemu)

qemu-img

convert [--object objectdef] [--image-opts] [--target-image-opts] [-U] [-c] [-p] [-q] [-n] [-f fmt] [-t cache]

      [-T src_cache] [-O output_fmt] [-B backing_file] [-o options] [-l snapshot_param] [-S sparse_size] [-m
      num_coroutines] [-W] filename [filename2 [...]] output_filename

example:

qemu-img convert -p

in progress...