Re: IOMMU keeping mapping over long period of time

[Andi Kleen]

Jerome Glisse <j.glisse@xxxxxxxxx> writes:
>
> GPU for which we are interested have dma mask of 40bits at least, thus
> they can work with high mem page. My main concern is when an iommu is
> active, such amount of continuously mapped page might exhaust the iommu
> address space. My understanding is that Intel & AMD iommu are capable of
> growing their address space but is it somethings we can rely on ?

I don't think relying on this is very wise. Better add some way to unmap
when space is running short.

-Andi
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