> To answer Mark's question:
>
> > What kernel are you using?
>
> from gentoo: xen-sources-2.6.20-r6
>
> Regarding the full error message, all I am getting is:
>
> kernel panic not syncing: PCI-DMA: Random memory would be DMAed
>
> since the machine is rebooting after that. There maybe 
> somewhere else to get more detail, but beyond dmesg or
> messages I am not sure where else to look.
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.
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.
-Mark Langsdorf
Operating System Research Center
AMD
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