[TF-A] MEM_PROTECT for secure world?

Hi,

As a PSCI call, MEM_PROTECT which is used to protect against cold reboot attack, can't be called from TZ-secure. In a situation where at run time, HLOS in NS-EL1 transfers some buffer that it owns, to a secure partition then secure partition can't call MEM_PROTECT because psci_smc_handler will return SMC_UNK if the caller is secure.

Should MEM_PROTECT be available to TZ-secure as well?

Thanks, Okash