Bingo! #kpti #intelbug
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second column is rdtsc_after-rdtsc_before (and yes, I ran it several times :-P) if the cache line is not present in the right cache, the signal gets very noisy (hits on every first cacheline into each page)
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Replying to @brainsmoke @ochsff
are you sure that PTI fixes this side channel? thing is, physically indexed caches don't really care which virtual address space the access comes from...

Jan 3, 2018 · 5:08 PM UTC

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Replying to @paxteam @brainsmoke @ochsff
Hmm, how would you trigger the speculative load without the mapping?
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