[Xen-devel] Re: Is Continuous replication of state possible?

[George Washington Dunlap III <dunlapg@xxxxxxxxx>]

On Fri, 7 Jan 2005 xen-devel-request@xxxxxxxxxxxxxxxxxxxxx wrote:

> This will be hard when running crypto programs that get
> their random numbers directly from the CPU ...
Yes, any sort of non-deterministic instruction must be either made to 
execute the same, or disallowed. :-)
I'm not familiar with the setup of those kinds of CPUs. Is this situation 
any different than that of RDTSC?  We can't allow native execution of 
RDTSC on different platforms either.
More annoying is the CPUID instruction, which is non-privileged (and so 
cannot be trapped & emulated like RDTSC), but returns different results on 
processors that are not identical...
 -George Dunlap

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