The model P7-L00 is only listed in chinese version of the site at http://www.emui.com/plugin.php?id=unlock (Normal, the model is only sold in China).
The forms to fill to obtain the unlock code are the same in Chinese and English, so I think you should be able to understand what information to provide.
Since I have a P7-L10, the bootloader was unlocked with B126 version ROM (or even a previous one).
There is a tutorial of "How to unlock", but in Chinese at http://www.miui.com/thread-2015129-1-1.html (This mainly explains how to apply the unlock code once you obtained from Huawei site, using ADB et fastboot).
Hope this helps!