Fully-virtualized guests (HVM/Intel-VT/AMD-V)
To run fully virtualized guests in Xen or KVM, host CPU support is needed. This is typically referred to as Intel VT, or AMD-V. To check for Intel VT support look for the 'vmx' flag, or for AMD-V support check for 'svm' flag:
On some Intel systems, virtualization support needs to be enabled in the BIOS. Please ensure that this has been done before proceeding.