On Mon, 2011-12-19 at 11:11 +1100, David Gibson wrote: > They have no inbuilt concept > of domains (though we could fake in software in some circumstances).
That sentence doesn't make much sense to me. Either you're saying that every device behind a given IOMMU is in *one* domain (i.e. there's one domain per PCI host bridge), or you're saying that each device has its *own* domain (maximum isolation, but still perhaps not really true if you end up with PCIe-to-PCI bridges or broken hardware such as the ones we've been discovering, where multifunction devices do their DMA from the wrong function). Either way, you *do* have domains. You just might not have thought about it before. -- dwmw2
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