FWIW I see nothing about Meltdown that requires OoO execution to leak data. The exact same approach should work on in-order cores that have caches and branch prediction. (Read, basically all but the tiniest microcontrollers.)
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Via BIOS updates etc. yes, and it's true that these are often conflated with ucode updates.
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and https://lkml.org/lkml/2018/1/4/615 … / https://twitter.com/aionescu/status/948983847672102912 … / https://twitter.com/aionescu/status/948753795105697793 … / https://twitter.com/aionescu/status/948750715844898817 … sounds like microcode can flip chicken bits, or change MSR availability, or something vaguely like that?
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