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The ICH_HCR_EL2 traps are used when running on GICv3 hardware, or when running a GICv3-based guest using FEAT_GCIE_LEGACY on GICv5 hardware. When running a GICv2 guest on GICv3 hardware the traps are used to ensure that the guest never sees any part of GICv3 (only GICv2 is visible to the guest), and when running a GICv3 guest they are used to trap in specific scenarios. They are not applicable for a GICv2-native guest, and won't be applicable for a(n upcoming) GICv5 guest. The traps themselves are configured in the vGIC CPU IF state, which is stored as a union. Updating the wrong aperture of the union risks corrupting state, and therefore needs to be avoided at all costs. Bail early if we're not running a compatible guest (GICv2 on GICv3 hardware, GICv3 native, GICv3 on GICv5 hardware). Trap everything unconditionally if we're running a GICv2 guest on GICv3 hardware. Otherwise, conditionally set up GICv3-native trapping. Signed-off-by: Sascha Bischoff <sascha.bischoff@arm.com> Signed-off-by: Marc Zyngier <maz@kernel.org>