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Spectre is more fun. The BTI attack is still a chip flaw, but you can forgive them for not thinking about it. That one is fixable. The real fun one is the misprediction/speculation attack. That one is fundamental. It affects how we think of secure coding.
I speculate (ha ha) that speculative execution barriers will become architectural and will be exported as compiler intrisics and we'll teach about them like we do for concurrency barriers and atomics for multithreading. There's just no easy magic fix.
