Comment 4 for bug 966849

I haven't checked what impact it has :-) It should have no impact on qemu-user, but I guess it will impact the qemu-system build just as it does the spice build.

I think we should be explicit in any case about turning this support on/off in the configure flags according to what we want to see happen. I have no relevant opinion on whether it should be on for qemu-system, except to say that it's worth investigating.