Requirements for Para-virtualized Guests
Only Xen supports para-virtualized guests. KVM is full virtualization.
Any x86_64, or ia64 CPU is supported for running para-virtualized guests with Xen. For i386 hardware, a CPU with the PAE extension is required. Many older laptops (particularly those based on Pentium Mobile / Centrino) do not have PAE support. To determine if a CPU has PAE support, run the following command:
The above output shows a CPU that does have PAE support. If the command returns nothing, then the CPU does not have PAE support.