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

[Rik van Riel <riel@xxxxxxxxxx>]

On Fri, 7 Jan 2005, Ian Pratt wrote:
> > On Fri, 7 Jan 2005, Ian Pratt wrote:
> >
> > > It basically just requires deterministic execution and event
> > > injection.
> > This will be hard when running crypto programs that get
> > their random numbers directly from the CPU ...
> Sure, when CPUs finally get embedded crypto features (and
> applications start using and _insisting_ on their presence) we'll
> have problems. For the moment, the technique should work.
Of course, it should be easy for CPU manufacturers to make
sure that the crypto instructions are trappable, so Xen can
make sure that both lockstepped virtual machines get the
same random number ...

--
"Debugging is twice as hard as writing the code in the first place.
Therefore, if you write the code as cleverly as possible, you are,
by definition, not smart enough to debug it." - Brian W. Kernighan


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