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Do cloud providers commonly float cores between VMs? I could see instances like the AWS T family (burstable) sharing, but I had always assumed that most instance types don't over-provision CPU.

If that's the case, my CPUs are likely pinned to my VM. I could still have evil userland apps spying on my own VM, but I would not expect this to allow other VMs to spy on mine.






Sharing CPUs is not the point, as long as you are sharing physical memory with other tenants, you are vulnerable (although exploits are much harder when attackers have to cross privilege boundaries).

> Sharing CPUs is not the point, as long as you are sharing physical memory with other tenants, you are vulnerable

Not to these vulnerabilities. These are attacking memory that is "in flight" within a processor.


I don't think many cloud providers explicitly pin the VMs to the cores even if they don't over provision the servers.



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