Re: [Qemu-devel] Re: [PATCH 1/6] Use correct types to enable > 2G support

[Ian Jackson]

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.