Enabling top-byte ignore on ARMv8 Base FVP

there are TCR registers for each EL.  i.e., TCR_EL2 and TCR_EL1 .  you would need to set all three for TBI to be active across all levels.

there are TCR registers for each EL.  i.e., TCR_EL2 and TCR_EL1 .  you would need to set all three for TBI to be active across all levels.

Thank you for your reply

Is this done by modifying the arm-tf firmware or by modifying the boot loader? How do I write to the register? Do you mean that I can set all three levels from the userspace? Is that done using prctl? Or do I pass some parameter to the FVP in a similar manner to enabling pointer authentication?