tree 4b36bd6728164a3d36535350fbba3a125b4d7100
parent 00f97e4d1cc90c552dd5f0d8026c6c3b544cce8c
author Manish Pandey <manish.pandey2@arm.com> 1700482928 +0000
committer Manish Pandey <manish.pandey2@arm.com> 1706793343 +0000

fix(ehf): restrict secure world FIQ routing model to SPM_MM

Exception handling framework (EHF) changes the semantics of interrupts,
sync and async external aborts. As far as interrupts are concerned it
changes the routing model of foreign interrupts (FIQs) by changing
SCR_EL3.FIQ to 1 for both non-secure and secure except when SPMD is
used along with Hafnium/SPM at S-EL2 [1].
For NS world it means : G1S and G0 interrupts are routed to EL3
For Secure world it means : G1NS and G0 are routed to EL3

There is no upstream use case utilizing EHF and re-routing EL3
interrupts to the Secure world except when SPM_MM is present.

Modify the FIQ routing model during EHF init just for known use cases,
Always for NS world and for secure world only if SPM_MM is present.

[1]:https://review.trustedfirmware.org/c/TF-A/trusted-firmware-a/+/16047

Signed-off-by: Manish Pandey <manish.pandey2@arm.com>
Change-Id: Ic292bbe8dd02d560aece5802d79569d868d8500f