[Cryptography] provisioning a seed for /dev/urandom

[James A. Donald]

>> You aren't going to have lots high quality randomness available via
>> /dev/random on the hypervisor in currently deployed VM hosting environments.

> There is typically plenty of interrupts from your network and storage
> devices which should provide plenty of entropy for the hypervisor.

Every interrupt should provide at least one bit of entropy.  There 
should be a lot more than 128 interrupts before the hypervisor gets running.

Thus, correctly programmed, the real urandom should have plenty of 
randomness to provide the virtual urandom, immediately a virtual machine 
is launched.

Of course, whether it actually is correctly programmed is another question.