I was a passenger on VX1357 (Alaska call sign, Virgin America livery) from BOS to SFO on 4/20/18. Aircraft A319 N525VA. Both pressurization computer systems faulted at cruise altitude. We diverted to ORD for an emergency landing at 20:45 CDT (Time corrected since original post). Trucks on runway and ambulances at gate. Please post ATC if this was captured.