Fabrice Bellard writes ("[Qemu-devel] Re: [PATCH 1/6] Use correct types to
enable > 2G support"):
> Paul Brook wrote: If we ever implement >2G ram on a 32-bit host this
> > may need some rethinking. We can deal with that if/when it
> > happens though. Requiring a 64-bit host for large quantities of
> > ram seems an acceptable limitation (N.B. I'm only talking about
> > ram size, not target physical address size).
>
> I agree.
This demonstrates quite nicely why we need to get rid of the
assumption that all guest memory is mapped by the host.
The configuration with a 32-bit host (dom0), 64-bit guest, and of
course 64-bit Xen, is very common. qemu runs (currently) in the
dom0.
Ian.
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