Discussion topic for Rooting Xperia 2011 devices (BL Unlocked)
https://cyanlabs.net/tutorials/rooting-xperia-2011-devices-bl-unlocked/
Difficulty: Very Easy
Here is a guide to root your Sony Ericsson Xperia Play with an unlocked bootloader no matter what version of Android you are on. This guide uses fastboot and a custom kernel with recovery and auto root functions.
Originally published at: https://cyanlabs.net/tutorials/rooting-xperia-2011-devices-bl-unlocked/