[PATCH v10 09/40] arm64/gcs: Provide basic EL2 setup to allow GCS usage at EL0 and EL1

[Catalin Marinas]

On Thu, Aug 01, 2024 at 01:06:36PM +0100, Mark Brown wrote:
> There is a control HCRX_EL2.GCSEn which must be set to allow GCS
> features to take effect at lower ELs and also fine grained traps for GCS
> usage at EL0 and EL1.  Configure all these to allow GCS usage by EL0 and
> EL1.
> 
> We also initialise GCSCR_EL1 and GCSCRE0_EL1 to ensure that we can
> execute function call instructions without faulting regardless of the
> state when the kernel is started.
> 
> Signed-off-by: Mark Brown <broonie at kernel.org>

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