To run KVM you need a processor that supports virtualization. For Intel processors this extension is called INTEL-VT. For AMD processors it is called AMD-V.
To see if your processor supports one of these technologies, run the following command under Linux:
# egrep ‘(vmx|svm)’ /proc/cpuinfo
If nothing is printed, it means that your CPU does not support hardware virtualization. Otherwise it does – but you still need to make sure that virtualization is enabled in the BIOS. If the SVM flag is returned then your processor supports AMD-V. If the VMX flag is returned then your processor supports INTEL-VT.
For Windows systems, run a special utility: