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Openstack-compute on virtual machine - Unable to create an instance

I have built an openstack(icehouse) platform with three virtual machines; controller, compute and network nodes. I aim to use qemu instead of kvm for virtualization. So I have inserted the following lines into /etc/nova/nova.conf in compute node:


[default] 
compute_driver=libvirt.LibvirtDriver

[libvirt]
virt_type=qemu
But if an instance is tried to be created, it immediately gets into error state:

Error: internal error: no supported architecture for os type 'hvm'
After some research, I have found the golden information:

Qemu hypervisor only supports RAW, QCOW2, VMDK virtual disk formats.
Mine is VDI. I have converted the disk image into VMDK format. 

qemu-img convert input.vdi -O vmdk output.vmdk
After running compute-vm on vmdk image, I become able to create an instance without any error.
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