I'd be more concerned about https://googleprojectzero.blogspot.com/2018/01/reading-privileged-memory-with-side.html … if rowhammer hadn't been left unaddressed for years now.
This is a lot more reliably exploitable and more difficult (impossible) to mitigate.
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The disabled the "no page table swap needed between kernel and userspace" optimization. 30% performance hit.
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It doesn't fix Spectre (the flaw in basically all oooe cpus) only Meltdown. And it's ~5% not 30% for typical loads...
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But will greatly exceed 50% for syscall-overhead-bound loads.
End of conversation
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