skattoju4 edited a comment on issue #3319: Use IDE as the bus type for root 
disks and VIRTIO for data disks when platform emulator strings start with 
Windows* except Windows PV
   @kiwiflyer after discussing this with @swill i have a better understanding. 
Essentially registering an ISO is supposed to be hypervisor agnostic. We can 
only know valid options for disk controller in the context of a selected 
hypervisor which in the case of ISOs is during VM creation. Given this it makes 
sense to have the option of specifying hypervisor specific options during VM 
creation. Currently this comes from vm details in the case of non ISO based 
templates but is not set the case of ISO based templates. As a result the agent 
tries to guess the disk controller based on the OS type specified during ISO 
template registration. Maintaining this guessing logic is not ideal. The 
deployVirtualMachine api has a details map that can be used to pass the 
rootDiskController value which is used by the KVM agent. We were able to verify 
this using cloud monkey.

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