Virtualbox or VMware vmdk to KVM qcow2

Migrate Virtualbox or VMware guest (on vmdk) to KVM

See disk image information.
# qemu-img info lwa-flat.vmdk 
image: lwa-flat.vmdk
file format: raw
virtual size: 50G (53687091200 bytes)
disk size: 50G

Convert the vmdk image to a qcow2 image.
# qemu-img convert -O qcow2 lwa-flat.vmdk lwa-flat.qcow2

Create a guest definition and start guest.
# virt-install --connect qemu:///system --import -n lwa \
--vcpus=1 --ram=2048 \
--disk path=/home/vm/fromvbox/lwa-flat.qcow2,device=disk,format=qcow2 \
--vnc --noautoconsole --os-type linux --description lwa \
--network=bridge:b0 --hvm

Migrate VMware or Virtualbox vmdk to KVM qcow2