On Thu, Aug 22, 2024 at 02:15:08AM +0100, Mark Brown wrote: > FEAT_GCS introduces a number of new system registers, we require that > access to these registers is not trapped when we identify that the feature > is present. There is also a HCRX_EL2 control to make GCS operations > functional. > > Since if GCS is enabled any function call instruction will cause a fault > we also require that the feature be specifically disabled, existing > kernels implicitly have this requirement and especially given that the > MMU must be disabled it is difficult to see a situation where leaving > GCS enabled would be reasonable. > > Reviewed-by: Thiago Jung Bauermann <thiago.bauermann@xxxxxxxxxx> > Signed-off-by: Mark Brown <broonie@xxxxxxxxxx> Reviewed-by: Catalin Marinas <catalin.marinas@xxxxxxx>
