Moving from Qemu KVM to Proxmox on same hardware

[robb]

I am currently running Qemu-KVM on an Ubuntu 14.04 host. Since I don't have spare hardware, I will need to backup my current VM's to restore them on the new ProxMox environment.
I understood that in theory a KVM VM disk (either raw or qcow2) can be used as disk on ProxMox (5.2) too, so would my strategy be:
- copy the diskimages from /var/lib/libvirt/images to a safe place
- Install ProxMox VE on the server
- Copy the disk image to the ProxMox VE images directory.
- Create a VM in ProxMox using the diskimage as Vdisk.

Would this be the correct method? Do I mis some steps here?
I am currently not near the Qemu KVM server, and don't know what format the diskimages are now, but if they were not .raw or .qcow2, how should I go if they were .img? I saw some suggestions that I can just rename from .img to .raw Is that correct?

 

[atl]

1. Backup your VM settings and your VM disk images (convert qcow to raw images)
2. Install Proxmox
3. Create VM with nearly the same settings as on Qemu-KVM (Libvirt) inclusive. disk
4. Copy content from VM disk image backup into proxmox VM disk using command:

dd if=/path/backup.raw of=/dev/mapper/pve-vm--{ID}--disk--1

5. Repeat step 3 - 4 for each backed up VM