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bogus random entropy sourcesbogus random entropy sourcesPosted Oct 7, 2010 12:24 UTC (Thu) by nix (subscriber, #2304)In reply to: bogus random entropy sources by intgr Parent article: Solid-state storage devices and the block layer
"Diskless embedded systems" of course includes "all virtual machines". So there are a lot of them.
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bogus random entropy sources Posted Oct 7, 2010 12:48 UTC (Thu) by intgr (subscriber, #39733) [Link]
For virtual machines you already have a paravirtual RNG device called 'virtio-rng' (CONFIG_HW_RANDOM_VIRTIO).
But in general, virtual machine disk I/O still reaches a physical disk sooner or later, so entropy can be successfully gathered from interrupt timings. In some virtualization scenarios, you wouldn't want the VM to access host-CPU-specific features anyway.
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