KVM: arm/arm64: vgic-new: Add GICv3 MMIO handling framework

Create a new file called vgic-mmio-v3.c and describe the GICv3
distributor and redistributor registers there.
This adds a special macro to deal with the split of SGI/PPI in the
redistributor and SPIs in the distributor, which allows us to reuse
the existing GICv2 handlers for those registers which are compatible.
Also we provide a function to deal with the registration of the two
separate redistributor frames per VCPU.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Eric Auger <eric.auger@linaro.org>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>

virt/kvm/arm/vgic/vgic-mmio.c

@@ -478,6 +478,11 @@ int vgic_register_dist_iodev(struct kvm *kvm, gpa_t dist_base_address,
 	case VGIC_V2:
 		len = vgic_v2_init_dist_iodev(io_device);
 		break;
+#ifdef CONFIG_KVM_ARM_VGIC_V3
+	case VGIC_V3:
+		len = vgic_v3_init_dist_iodev(io_device);
+		break;
+#endif
 	default:
 		BUG_ON(1);
 	}