On Tuesday 24 April 2007 22:33:04 Ashok Raj wrote:
> With PCIE there is some benefit to keep dma addr low for performance reasons,
> since it will use 32bit Transaction level packets instead of 64bit.
>
> This reservation is only required if we have some legacy device under a p2p
> where its required to share its addr space with other devices. We could
> implement a default when one is not specified to keep things simple.
We already have a couple of other IOMMU architectures who essentially have the same
problem. Have you checked how they solve this?
-Andi
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