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You can control whether Non-secure software has access to the RAS architecture-compliant register space by using GICD_SAC.GICTNS. Its reset value is set by the gict_allow_ns tie-off signal.
In the case of an error, and if the GICD_CTLR.DS == 0, all SPIs, PPIs, and SGIs, resort to a Secure group. Therefore, interrupt programming is not revealed to the Non-secure side.