Observability Support for COCONUT-SVSM

A guest operating system (OS), running inside a Confidential Virtual Machine (CVM), does not know the state information, such as log data or memory usage, of the secure module COCONUT-SVSM, which is responsible for managing the CVM. This information can be useful for the guest OS to understand the environment it is running in. A new protocol has been defined to enable the retrieval of this information. This project implements this observability protocol. The work is divided into several steps, which are also the deliverables: the implementation of a SVSM-side handler for the protocol, a guest-side handler, which is a Linux device driver, and a user-space tool, which uses the Linux device driver to retrieve and save the information.