Dan Armak wrote:
It does work without an IOMMU, it just doesn't protect you from a buggy driver
causing DMA access to the wrong address. For other kinds of driver bugs, this
might still be better than no virtualization.
Thing is, a real (as opposed to para-virtualized) kernel does not know
what physical addresses it runs on. It does not have to be buggy in
order to give the DMA controller the wrong addresses.
You are right that I did not account for para-virtualized domains. As
far as I know, of the three, only Xen supports those.
Shachar
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