Reminder: all Spectre, except v1 style, should be fully fixable, without trusting vendor ucode updates to do it right, by flushing whole cache hierarchy at every kernelspace entry and exit and turning off HT. Anyone tried this and measured cost?
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Replying to @RichFelker
I wonder if flushing the TLB would be enough since L1 is physically tagged on popular CPUs
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Replying to @kirtivr
No, because you can look for evictions of your own cached data to determine what speculative accesses happened in the victim.
8:56 AM - 27 Aug 2018
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