A more technical writeup on what can be done to address #Meltdown and #Spectre in future CPU designs. If there's interest, I can write a longer version with graphics and so on:https://www.linkedin.com/pulse/addressing-meltdown-spectre-future-silicon-jon-masters/ …
I don't see anything (here, or from Intel) addressing Spectre variant 1, which is really the root cause of the problem. Variant 2 wouldn't exist without the flaw behind variant 1.
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That’s because I don’t believe variant 1 has a straightforward hardware fix. But it is very low overhead to do it in software, so I think that’s where it ends up for the moment...
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There's no universal sw fix. It requires hacks everywhere that might be affected. That's not viable (many will be missed) much less sustainable.
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Right - it’s a compiler level thing or you just have hacks. And I agree. But the big hammer isn’t going to be viable so we *will* have hacks
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No, it's a kernel-level thing or you just have hacks. Inability to safely run existing binaries for the baseline ISA means you're effectively not compatible with the original ISA/ABI... in which case, why stick with x86 at all?
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I agree we *will* have hacks for the forseeable future, but the hacks will be partial mitigations for safety in existing broken chips. New chips need full safety against Spectre variant 1.
End of conversation
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