How to find out whether your hardware supports Xen?

How to find out whether your hardware supports Xen?

Para-virtualization requires:
- PAE (Physical Address Extension)

Fully-virtualization requires:
- Intel (vmx)
- AMD (svm)

For Linux:
# cat /proc/cpuinfo | grep flags

For FreeBSD:
# cat /var/run/dmesg.boot | egrep -i 'pae|vmx|svm'