Hello tf-rmm group,

I'm currently conducting research on the MEC (Memory Encryption Context) feature for sharing memory pages across multiple realms, and I'm interested in testing and potentially extending this functionality w/ new use-cases.

I noticed that there are mec-proto branches available across the TF-A repositories, including rmm, linux, kvmtool, and tf-a, specifically for the CCA memory encryption context. However, I've been unable to successfully launch a system using these branches on the FVP models.

Is there a reference setup or guidance available for bringing up a MEC-enabled Realm environment, similar to the DA branches discussed here?

Also, extending MEC feature to allow sharing pages across multiple realms are feasible w/ current hardware (RME w/ MPE) spec? w/ utilizing MEC_STATE_SHARED state in RMM 1.1 alp14 spec.

Thank you,
Jaehyeon Lee