Any doc/wiki or paper introducing the zero-copy memory transferring mechanism?

[clover2024]

The readme file mentioned that "Penglai supports the synchronous and asynchronous cross-enclave communication using the zero-copy memory transferring mechanism". I tried to search about details about the "zero-copy memory transferring mechanism" but failed. I wonder if there are any doc/wiki or paper introducing the zero-copy memory transferring mechanism? Thanks.
P.S. I have tried the IPC demo in Penglai-Enclave-TVM and get the following result, but I could not fully understand the mechanism behind it. Many thanks if you can provide me with some introduction level docs.

[05lover]

This may help.
https://penglai-doc.readthedocs.io/en/latest/Tutorials/Tutorial-Penglai-TVM-ipc.html#ownership-transferred-memory

Schrodinger page can only be mapped in either host or enclave. When schrodinger pages are allocated, they are first mapped in the host space. So host can read / write these pages as normal memory. When the enclave runs, monitor will guarantee that all the schrodinger pages is unmaped in the host, and remap to enclave. So enclave can read / write these pages. Schrodinger pages are used to defend against the Time-Of-Check-To-Time-Of-Use (TOCTTOU) attack, and can realize the zero-copy communication.