No, it's permitted. What would violate the PCI spec would be failing
to decode the full 32/64 bit address and creating aliases (like 10-bit
ISA cards did). This is just a reestriction on which parts of memory
a card can DMA to.
Actually, it'd be useful to have a central list of what DMA masks devices
really take. It might provide some arguments for changing the zone allocater.
"Next the statesmen will invent cheap lies, putting the blame upon
the nation that is attacked, and every man will be glad of those
conscience-soothing falsities, and will diligently study them, and refuse
to examine any refutations of them; and thus he will by and by convince
himself that the war is just, and will thank God for the better sleep
he enjoys after this process of grotesque self-deception." -- Mark Twain
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