Wait a minute, doesn't systemsim has a passthrough call for memmove?
we should wire that up then this won't impact performance at all.
We were/are trying to eliminate all simulator specific passthrus in
the Xen core code.
That sounds rather counterproductive. What's wrong with
having some minimal passthroughs? They help performance
a *lot*, it's quite painful to run without. Of course,
a command line option to disable it would be nice.
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