There is no indication that the M1 has updatable microcode, nor any other features that might allow such mitigation. (If it did, Apple would've fixed it; I did

There is no indication that the M1 has updatable microcode, nor any other features that might allow such mitigation. (If it did, Apple would've fixed it; I did give them a 90 day disclosure warning and they're not lazy about fixing actual fixable bugs.)