Hi,
We are in the process of upgrading the downstream TF-A to v2.9 for platforms with SPMD_SPM_AT_SEL2=1. These platforms already use EHF for servicing RAS interrupts today.
I noticed that v2.9 has added G0 interrupt handling support to the SPMD. But I think the SPMD support still needs some work as it does not play nicely with EHF.
I have found the following issues with the implementation.
1. SPMD and EHF both register handlers for G0 interrupts. But the interrupt management framework only allows one handler for INTR_TYPE_EL3. 2. The RAS framework still uses EHF and the SPMD interrupt handler breaks that functionality. 3. The SPMD handler calls into the platform which does not have any means to invoke the RAS interrupt handler.
IMO, we should make SPMD a client of the EHF instead of creating yet another way for interrupt handling. For now, I register SPMD's G0 interrupt handler only if EL3_EXCEPTION_HANDLING=0, as a workaround.
Thoughts?