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@david_chisnall Ack everything re: the network slowing down.

>A malicious device can choose to use a different mapping.

Yes, but when the malicious devices tries to write/read into kernel mem using its own chosen device physical addresses, the IOMMU will recognize that the kernel said "no, I don't allow writes/reads through this address" and quash the write/read.

And how would the device be able to choose which host physical address it wants to (maliciously) read and write?