Could and How arm/trust firmware deal with store intelligibility in trust zone innovation?

In trustzone innovation, world exchanging among rich and secure universes might happen when 1)invoke a trust application 2)insecure interference intrudes on the execution in secure world.

Notwithstanding, reserve cognizance might be an issue in this methodology as normally (or simply in my soc) L1 store utilizes compose back approach.

I'm interested about could and How arm/trustfirmware manage this?

By clear and refute the entire L1 Data/Instruction reserve? Assuming this is the case, doesn't it debase the presentation to such an extent?

Any thought would be useful and anticipating examine with you ;)