Yes - Intel does have broken speculative execution, @scarybeasts (not an arbitrary read yet, but definitely a leak that shouldn't work)pic.twitter.com/qx2dcJsjzB
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That's a really interesting point - I assume between the multiple kernel teams they've considered this, so maybe my theory is false, or maybe there's a trick to load kernel data into L1 without context switching? (A hyper-thread on the same core?)
I think that the latter is correct - I was also thinking about the L1$ flush mitigation, but HT thread should be able to force-populate L1 w/ kernel data indeed.
Indeed, but for many workloads I'd happily choose disabling HT over making syscalls 2-5x as costly.
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