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>> + >> + /* >> + * The GIC version(s) we're happy creating guests with. Right now for >> + * simplicity it is tied to the active hardware version, but this will >> + * cease to be the case if/when the compatbility modes are enabled. > s/compatbility/compatibility/ > > GICv3 may support GICv2 and we support libxl guest requesting GICv2 on a GICv3 > host. Why are we not exposing this information here? Hmm.  That wasn't my reading of the logic at the time I wrote this. Looking at it again, we probably should be advertising the result of vgic_v2_hw.enabled alongside the main GIC version.  (Plus whatever ifdefary is required to make this build.) The domain create side is even more wonky.  arch_sanitise_domain_config() takes the toolstack choice of vGIC versions and asks whether the number of CPUs is compatible, but it's midway through arch_domain_create() which first notices if the requested vGIC version isn't compatible with hardware. There really wants to be an __ro_after_init supported_vgic_versions (name subject to improvement) which is filled in by the various GIC initialisation routines, rather than a set of backbacks into disjoint drivers. ~Andrew