Thanks for chiming in Mark, I was at a loss to suggest something specific!
> For some reason, your kernel is running with pci-gart.c
> enabled, and dom0 is trying to allocate DMA through the
> AGP GART in your AMD64 processor's Northbridge. I
> didn't think Xen supported pci-gart, but maybe I missed
> a changeset.
Maybe a Gentoo-specific patch?
> At any rate, passing iommu=soft should disable the pci-gart
> and allow you to use bounce buffering. Hopefully, that
> should clear up your problem.
If it does fix it, I'd suggest reporting it to the package maintainer.
Cheers,
Mark
-- 
Dave: Just a question. What use is a unicyle with no seat? And no pedals!
Mark: To answer a question with a question: What use is a skateboard?
Dave: Skateboards have wheels.
Mark: My wheel has a wheel!
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