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The TableDesc struct defines properties of the in-guest-memory tables which the guest tells us about by writing to the GITS_BASER<n> registers. This struct currently has a union 'maxids', but all the fields of the union have the same type (uint32_t) and do the same thing (record one-greater-than the maximum ID value that can be used as an index into the table). We're about to add another table type (the GICv4 vPE table); rather than adding another specifically-named union field for that table type with the same type as the other union fields, remove the union entirely and just have a 'uint32_t max_ids' struct field. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org>