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Mathieu Poirier

Mathieu Poirier

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The whole software stack for CCA is in development, meaning instructions will change frequently and repositories are temporary. Instructions to compile the stack, both manually and from the OP-TEE build environment, have been written from a Ubuntu 22.04 LTS based system.

Table of Contents

With the OP-TEE build environment

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Status: QEMU support has been merged. Additional patches are needed until QEMU supports a couple features that are mandatory for RME (PMUv3p7 and ECV)PMUv3p7 is supported by QEMU.

Repo: extra patches are at https://git.codelinaro.org/linaro/dcap/rmm branch cca/v2
official repo is https://git.trustedfirmware.org/TF-RMM/tf-rmm.git/

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  • Disable USE_VIRTCONSOLE in order to see all boot logs. Doing this enables the emulated PL011 serial and is much slower. Although edk2 does support virtio-console, it doesn’t display the debug output there (but you’ll still see RMM logs showing progress during boot).

  • When booting via grub2, the kernel parameters are stored in grub.cfg which is copied from board/aarch64-efi/grub.cfg by the buildroot script board/aarch64-efi/post-image.sh. Bu default the kernel parameters do not define a console, so Linux will determine the boot console from the device tree’s /chosen/stdout-path property, which QEMU initializes to the default serial console. So if you want to boot with virtconsole, add console=hvc0 to board/aarch64-efi/grub.cfg before making buildroot.

Attestation Proof of Concept

A demonstration application called cca-workload-attestation has been integrated to the root file system. From a Realm VM, it provides users with the capability to query the RMM for a CCA attestation token that can either be printed to the console or saved to a file. It also demonstrates a typical interaction with an attestation service by communicating the CCA attestation token to a local instance of the Veraison services. Details on the cca-workload-attestation, the Veraison services and the endorser that populate the endorsement values can be found here.

Tips

Automate some things in the host boot

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