Falcon 9 v1.1/F9R was designed as a human rated launcher, so physically it already is. The main difference would be a software upload to reduce G loads the crew is exposed to and avoid maneuvers that would make aborts difficult (aka "black zones".)
Hey Docm, what would SpaceX have to do to to Human rate the Falcon 9 v 1.1.?
It actually goes goes beyond the usual human ratings because it has engine-out capability. Engine-out for Falcon 9 v1.1 means there is armor plate and fireproofing between its 9 engines, so if one or two fail catastrophically the others are protected and can simply throttle up to continue the mission.
Having the 9 engine layout means losing one only reduces thrust by 11% instead of 50% like Antares. Such a single engine failure with Falcon 9 wouldn't end the mission
This has actually been used during a CRS flight of Falcon 9 v1.0, which also had engine-out. The fuel dome of its #5 engine let go so the computers shut its systems off, burned the remaining 8 engines longer to compensate (it's engines weren't throttleable), and Dragon got to ISS 30 minutes early.