If you create a virtual machine using the paravirtualization (PVM) mode with huge page support enabled, and then attempt to change both the mode to PV-HVM or HVM and disable huge page support at the same time, an error similar to the following is returned:
OVMRU_005086E VM: vm1. Huge pages is not compatible with the VM's domain type: Xen HVM.
Workaround: Perform these changes as two discrete actions. First edit the virtual machine to disable huge page support, then edit the virtual machine to change the virtualization mode.
Bug 18499531