All: The fix in this patch appears to be unconditional.
I do a lot of work with embedded Intel Atom processors, which do not implement speculative execution. (Only one of them even implements limited out-of-order execution.) These systems aren't terribly powerful by today's standards, and would suffer serious performance impacts should the fix be turned on unnecessarily. Will there be automatic detection of 32-bit Atoms (all of which are definitely not susceptible) and 64-bit Atoms (all of which, except for Avoton, are definitely not susceptible; Avoton might have some very limited exposure due to out-of-order execution, but may also not be vulnerable because the OOE is not speculative) to avoid unnecessary performance impacts?
--Brett Glass At 05:14 AM 1/12/2018, Oliver Pinter wrote:
The test patch is here: https://reviews.freebsd.org/D13797
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