So, the TL;DR seems to be that ~all major CPU vendors fail at side channels in some way, but Intel is failing way more than the others by allowing userland<->kernel infoleaks. Correct?
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i guess there's no PoC for that, and it certainly looks more difficult than using variant 3 on intel, but seems doable. variant 2 looks pretty powerful
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My read: Variant 3 is Intel-only. Variant 1 is all vendors but does not cross address spaces. Variant 2 is interesting because it probably works on every vendor too, you just need to RE their branch predictor.
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