Description of problem:

I'm using an empty (no partition table, no partitions) 16GB raw image to install Cauldron from Mageia-6-dev1-x86_64-DVD.iso (16-Mar-2016) to a VM in qemu on an Arch host with this commandline:

SDL_VIDEO_X11_DGAMOUSE=0 qemu-system-x86_64 -enable-kvm -smp 2 -m 2048 -soundhw hda -monitor stdio -net nic,macaddr=00:16:3e:f4:ed:e2,model=virtio -net  bridge,br=xenbr0  -usbdevice tablet -drive  file=cauldron.img,if=virtio  -device qxl-vga -spice port=5930,disable-ticketing,streaming-video=off  -pflash ovmf/OVMF.fd -cdrom ../Iso/Mageia-6-dev1-x86_64-DVD.iso

The partitioner module recognizes the disk as "VirtIO block device (16GB)" in the pulldown menu where you can select the disk to use. Choosing "Custom disk patitioning" presents an emtpy vda-device, but cannot create any partition on it. The error message in the popup window is "Partitioning failed: current_hd called but $current_kind is not an hd ()."

Choosing "Use entire disk" takes you to the next step of the installation process, but leaves a window with the partitioner in front open.

Another workaround is to create the partition table, partitions and file systems on the host and choose "Use existing partitions"

Attached screenshot shows output of tty3 in during process of partitioning