On Wed, Aug 20, 2025 at 10:06:49PM +0100, Marc Zyngier wrote: > Mark Brown <broonie@xxxxxxxxxx> wrote: > > In order to allow userspace to control availability of the feature to > > guests we enable writability for only ID_AA64PFR1_EL1.GCS, this is a > > deliberately conservative choice to avoid errors due to oversights. > > Further fields should be made writable in future. > I'm not sure what you mean by that. Making the feature field writable > is only allowable if we have some level of support (and otherwise we > should prevent both the feature being exposed, and the field being > writable). > So future fields being writable will only happen when the features are > fully supported, and only then. > Please clarify, or drop this altogether. That's bitrot from earlier versions where we needed to enable ID_AA64PFR1_EL1, the other versions were similar. I'll remove these stale references.
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