> Just a question: For Isolation Level 1, the hardware features of v8-M should be sufficient to implement interrupts natively.  Is this correct understanding or did I miss anything?

 

This is essentially correct. As this is outside of the PSA-FF at present, TF-M would need to design and document how to integrate such IRQ handlers with its interrupt management framework, and how the interrupt handler can interact with the secure service code. For example, this might be achieved by resuming a SFC call that is waiting for a hardware operation to complete or delivering a signal to an IPC mode Secure Partition.