tree 411543af00cdd71e6690fff5e84604a43b50803a
parent 8e14e44e6049e6da560be63015dd2e69426a4720
author Fuad Tabba <tabba@google.com> 1573490870 +0000
committer Fuad Tabba <tabba@google.com> 1573815068 +0000

Inject an exception into EL1 instead of panicking for unsupported MSRs

When accessing an unsupported, undefined, or deliberately blocked system
register, inject an exception into the EL1 of the VM instead of panicking.

Exception Class (EC) 0x0 is used, because it applies to accessing a system
register that is either not allocated or not permitted. See Arm Architecture
Reference Manual Armv8-A, page D13-2924.

Added a basic unit test for this, which I plan to expand to ensure that other
protected system registers inject exceptions.

Bug: 140916188
Change-Id: Idaf3c420bdd5a4b5e1d77000c6f850476dc3acc6