[emusan]

I think the original patchset is from December 4th: https://lkml.org/lkml/2017/12/4/709 though I could be mistaken.

[twotwotwo]

That's "a major overhaul of the KAISER patches" as the commit message says. It doesn't mention the connection to speculative execution, though; that was the bit I was interested in.