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Set ID_AA64PFR1.RNDR_TRAP=1 on the max CPU model so guests and firmware detect FEAT_RNG_TRAP, per the Arm Architecture Reference Manual for A-profile architecture (DDI 0487), and document the feature as emulated in docs/system/arm/emulation.rst. Signed-off-by: Jason Wright <wrigjl@proton.me> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>