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Then there's the branch target misprediction attack; it seems to rely a lot on the details of Intel branch prediction, but it's unclear whether other CPUs are affected by variants of it. Maybe this is patchable in microcode?
Looks like it is. "Intel has also started releasing microcode updates that basically add some chicken bits and also let you flush branch predictor state to handle the context switch case." https://lkml.org/lkml/2018/1/3/859 …
But apparently it's horribly slow on existing CPUs, due to restrictions on what they can do in microcode. Newer ones will come with a performant IBRS instruction to invalidate branch prediction state.
@aionescu any new microcodes shipping in Windows updates? you can run https://github.com/platomav/MCExtractor … on mcupdate_GenuineIntel.dll to check.
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