Xen Howto
From linux-sunxi.org
xen could run on A20 (Cortex-A7 dual core, code name sun7i). A31 (Cortex-A7 quad core, code name sun6i) should work as well.
For more infomation reference: http://wiki.xen.org/wiki/Xen_ARMv7_with_Virtualization_Extensions/Allwinner.
