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

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@kernel.org

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