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SubjectRe: [PATCH v4 04/14] PCI/P2PDMA: Clear ACS P2P flags for all devices behind switches
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> Alex (or anyone else) can you point to where IOVA addresses are generated?

A case of RTFM perhaps (though a pointer to the code would still be appreciated).

https://www.kernel.org/doc/Documentation/Intel-IOMMU.txt

Some exceptions to IOVA
-----------------------
Interrupt ranges are not address translated, (0xfee00000 - 0xfeefffff).
The same is true for peer to peer transactions. Hence we reserve the
address from PCI MMIO ranges so they are not allocated for IOVA addresses.

Cheers

Stephen

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