Hi Everyone, Developer branches for TF-RMM and the kernel, which demonstrate the device assignment setup flow is available. To reproduce this flow on FVP, there is a Shrinkwraphttps://shrinkwrap.docs.arm.com/en/latest/userguide/configstore/cca-3world.html overlay. Instructions for using it can be found here : https://git.trustedfirmware.org/plugins/gitiles/TF-RMM/tf-rmm.git/+/refs/hea... The specific branches for the respective components are:

TF-RMM: https://git.trustedfirmware.org/plugins/gitiles/TF-RMM/tf-rmm.git/+/refs/hea... Linux: https://gitlab.arm.com/linux-arm/linux-cca/-/tree/cca-1.1/da/proto/rmm-1.1-a... kvmtool: https://gitlab.arm.com/linux-arm/kvmtool-cca/-/tree/cca-1.1/da/proto/rmm-1.1... TF-A: Changes are merged in master , so tip of master should be good (https://git.trustedfirmware.org/plugins/gitiles/TF-A/trusted-firmware-a/+/re...)

This release is based on the RMM v1.1 Alpha 12 specification. It includes setting up a secure SPDM session for communication with DSM, TDISP, and IDE, including the RMM-EL3 interface for RP programming. This is entirely new development and has undergone limited internal review. As such, we are aware that the code lacks comprehensive checks and hardening. Additionally, Stage 2 MMU changes for device mappings the Stage 2 SMMU driver are not tested/supported. As a result, Realms cannot access device memory or support device DMA to Realm memory.

Furthermore, the TDISP_En flag setting in DVSEC and other DVSEC programming have some gaps. This functionality is still under active development, and the programming and testing is limited to capabilities of the FVP. As development progresses, we will continue to update the branches accordingly. Any changes in user instructions will be reflected in the accompanying documentation.

Best Regards Soby Mathew