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You should see "pti" on the "flags" line of /proc/cpuinfo. You apparently don't, so you don't have page table isolation.

No, he shouldn’t be seeing that regardless as it doesn’t match the grep regex. I don’t know what, though.

Edit: facepalm. Or should that be foot-in-mouth?

It does match the regex. "pti" is a substring in "exception"

Thanks. I feel stupid, I looked that line up, down, and sideways for a match :/