The official PPC support was introduced in 3.4.z.
However all the required changes were merged also to 3.5 but were never tested due to lack of testing resources.
This bug is about testing and officially supporting a 3.4 PPC cluster on a 3.5 RHEVM.
Meaning all PPC related tests (same that were performed for the official PPC release) should be done with a 3.5 engine