Linux user-level implementation of OP-TEE

Hello,

I am Jork Loeser from Microsoft, and we are looking into providing the OP-TEE internal core API from Linux user-level, as well as hosting a derivative of OP-TEE OS in Linux user-level. Can you say is something like this has been attempted in the past, and perhaps provide pointers?

How interesting would it be for OP-TEE to have such an implementation - e.g., for early/rapid-development purposes?

Best, Jork