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?
Every entry/exit is needed to avoid kernel leaks if you don't trust mitigations on kernel side. Otherwise just at vm context switch is ok.
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It would be nice to see both tested and compared.
Thanks. Twitter will use this to make your timeline better. UndoUndo
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