Messages in this thread | | | From | "Stephen Bates" <> | Subject | Re: [PATCH v4 04/14] PCI/P2PDMA: Clear ACS P2P flags for all devices behind switches | Date | Fri, 11 May 2018 22:24:59 +0000 |
| |
All
> 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
| |