Well, in that 4chan article they refer to: https://twitter.com/grsecurity/status/947147105684123649
also: https://news.ycombinator.com/item?id=16046636
https://lkml.org/lkml/2017/12/27/2
AMD processors are not subject to the types of attacks that the kernel
page table isolation feature protects against. The AMD microarchitecture
does not allow memory references, including speculative references, that
access higher privileged data when running...
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