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Article ends with "Herrenschmidt said the patches aren't trying to solve problems happening inside of a customer VM running SMT and nor are they about protecting VMs against other VMs on the same system."

Well then what the fuck IS it for?

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To protect processes from snooping by other processes on the same core with disabled SMT.

AWS has non-virtualized "metal" instances as well. Customer may be be running container workloads on those instances with SMT disabled.

If it's not a VM you dont need to worry about the cache.

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