Spectre/Meltdown nominated for most over hyped bug at Pwnies
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Fundamental design changes are needed to make it fast, specifically fast enough to be acceptable to most users. Just fixing it is trivial: nuke speculation.
Nuking speculation is only trivial if that is already “designed in”. Perhaps okay for new processors. The “speculation barrier” is what is on the table for current designs that may be able to be introduced by micro-code.
Nuking (all, not just BTB) branch prediction should also work (aside from meltdown I'm not aware of other ways speculation could be exploited, but not 100% sure) and seems likely to be possible with microcode.
If neither is possible, vendors should be offering compelling technical explanations of why it's not possible rather than refusing to even speak about it. The appearance is that they DON'T WANT TO FIX IT in any way that would look bad wrt performance.
Yes a Skylake i7 might perform like an old Celeron with this proposed MSR. I'm perfectly okay with that. Of course some users won't be, but since this is a defective product we need to be given the choice as a remedy.
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