HSS requires proprietary communication between the camera and the speedlite.
There are three options;
Speedlite in hotshoe
Speedlite connected to hotshoe via a cable, radio control system that supports HSS (Pocket Wizard Control TL, Radio Poppers or Pixel Kings)
Speedlite in hotshoe (or pop up flash in 7D, 60D) that acts as a master to control other speedlites as slaves. (This approach is described in the camera manual and/or the speedlite manual.
Also, remember that HSS requires about 2 stops of light overhead. i.e. the flash won't be as bright.