I looked at microcode_amd_fam17h.bin (supposed microcode fix for Spectre) and it *only* applies to fam17h model 1 stepping *2*. Which as far as I can tell is EPYC. My Threadripper is stepping *1* and is *NOT* updated by this microcode. So consumer CPUs are NOT fixed yet.
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I think
@michaellarabel did some benchmarks with KPTI that showed slowdown on Epyc, but not much on standard zen. Makes sense now.1 reply 0 retweets 0 likes
KPTI is disabled outright on AMD processors since they are not vulnerable. This is about IBRS/IBPB.
9:34 AM - 27 Jan 2018
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