[TF-M] Interrupt SLIH Scheduling

Dear developers,

I have a question about interrupt SLIH scheduling in IPC model.

Assume that there are two secure partitions P1 and P2, and P1 has higher priority than P2. P1 calls psa_call(), so SPM blocks P1 and wakes up P2 to execute P2's service handler. Now P2 is running. Suddenly P1's interrupt occuerred, and P1's SLIH signal is asserted for more processing. A shedule request is also triggered.

Since P1 has higher priority than P2, will P2 be preemted by P1 to execute P1's SLIH immediately? If the answer is yes, the psa_call() chain will be corrupted, right?

Thanks in advance. Alvin Chang