On Mon, Dec 16, 2019 at 02:17:09PM +0530, Amit Daniel Kachhap wrote:

From: Kristina Martsenko <redacted>

Set up keys to use pointer authentication within the kernel. The kernel
will be compiled with APIAKey instructions, the other keys are currently
unused. Each task is given its own APIAKey, which is initialized during
fork. The key is changed during context switch and on kernel entry from
EL0.

The keys for idle threads need to be set before calling any C functions,
because it is not possible to enter and exit a function with different
keys.

Reviewed-by: Kees Cook <redacted>
Signed-off-by: Kristina Martsenko <redacted>
[Amit: Modified secondary cores key structure, comments]
Signed-off-by: Amit Daniel Kachhap <redacted>

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>

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