[TF-A] Nailgun

Hi,

Recently, I learned about Nailgun [1] - leak information by snooping across privilege boundaries with the help of CoreSight. The proof of concept uses Raspberry Pi3 (uses Cortex A-53 CPUs) platform to demonstrate the exploit.

Has anyone reviewed this attack and does it affect other Arm v8 CPUs too? Do we have support in TF-A to disable CoreSight to mitigate against such attacks? Are there any other mitigations against this attack?

-Varun

[1] https://github.com/ningzhenyu/nailgun