Running a KVM image within VirtualBox
1. Get your kvm virtualmachine zipfile 2. Extract the zip, you should get a .qcow2 file 3. Use qemu to convert this to a vdi file: qemu-img convert -O vdi virtual.qcow2 virtual.vdi 4. Create a new vm within VirtualBox, and select the converted .vdi file as its harddisk 5. Profit
For raw files: VBoxManage convertdd virtual.raw virtual.vdi --format VDI