Even more Meltdown

Are you tired of hearing about Meltdown/Spectre yet?  Doesn’t matter!  The two sysctls for controlling mitigation in DragonFly have been renamed:

machdep.meltdown_mitigation
machdep.spectre_mitigation

They go to hopefully sensible defaults, but Matthew Dillon has done some testing to show the effects of each in various combinations.  Note that this is not the final mitigation work; compilers (i.e. gcc) are being updated to include workarounds for this, so new gcc -> new compiler in DragonFly -> new defenses.  No silver bullet there, though.

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Author: Justin Sherrill

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