Arm introduced CCA (Confidential Compute Architecture) with the ArmV9-A ISA which is used in the Arm Neoverse V2 cores found in the Grace CPU, but I can’t find any information on whether the Grace CPU itself has CCA support.
It’s a feature that would be required in systems built around Grace (such as the DGX GH200) to make use of confidential computing features in the H100 GPU [0], so given the attention to confidential computing with the H100, I thought there would be some mention of it for NVIDIA’s new Grace CPU given its tight integration in the GH200 Superchip, but so far I haven’t found any confirmation one way or the other.