Wow some actual technical information on the spectre mitigation uc updates.https://twitter.com/johnregehr/status/955620344932442112 …
One-off flush is not a disable. It does nothing to make running existing binaries safe.
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Yes I realized that you just wanted an instruction to run once, not once per context switch. You’re better off switching to an in-order arch for that. I understand Atom still is in-order. I have a pentium from 1996 that I can give you, too.
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Historically TR12 MSR bit 0 was NBP (no branch prediction) but I can't find if it still exists.
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Didn't it just disable dynamic branch prediction? Spectre-like vulnerabilities still exist with static prediction (you actually save the attacker the bother of poisoning the branch prediction first).
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Not sure.
End of conversation
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