[PATCH v2 2/3] efi: arm64: Wire up BTI annotation in memory attributes table

[Mark Brown]

On Wed, Feb 08, 2023 at 03:36:40PM +0100, Ard Biesheuvel wrote:

> OTOH, what is the penalty for setting the GP attribute and using the
> translation table on a core that does not implement BTI?

The concern with doing that for Linux was what would happen if someone
implemented a system with mixed BTI/no BTI support and then a task got
preempted and moved between the two, you might end up with PSTATE.BTYPE
incorrectly set and trigger a spurious fault.  That shouldn't be an
issue for EFI runtime services.
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