Do modern CPUs flush branch predictor state on context switch? https://lkml.org/lkml/2018/1/4/635 … seems to indicate that they don’t. If not, why are we treating process separation as “the thing that fixes Spectre”?
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I don't see how it would work. Wouldn't that be racy when multiple processes are involved? Imagine context switches between your "scramble" step and the "execute the JS" step.
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Yeah, you’re right, it doesn’t work.
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