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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.
So it’s going to be up to the OS to prevent CPU security bugs. Great.
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