See there was still some confusing about this. Spartycrunch chimmed in on this to be clear.
Every single game you can run on an Xbox One will also run on Xbox Series X. They will also run better by default. Just like Xbox One --> Xbox One X. Some may get even further enhancements like automatic HDR or resolution bumps, depending on what the compatibility team is able to pull off.
No "boost mode", no variability. Everything just works, and works better. Every back-compat original Xbox and Xbox 360 game, and every single Xbox One game.
All of the controllers you bought for your Xbox One will also work on Xbox Series X, and will get a firmware update to take advantage of dynamic latency input too