Aaand suddently VM-exit latencies on Intel CPUs will go through the roof, oh, and if you're still putting different guests on sibling hyperthreads you're going to get pwned and you know it. Good job, Intel. You saved a few AND gates. Was it worth it? https://www.redhat.com/en/blog/understanding-l1-terminal-fault-aka-foreshadow-what-you-need-know …
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"Let's use garbage bits for something, it's fine, we'll throw away the result later". No. No it isn't fine. Why the fuck would that ever be a good idea? If you can't take the fault immediately at least poison the garbage data with zeroes!
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