Messages in this thread | | | Date | Mon, 8 Jan 2018 12:49:50 -0700 | From | Jason Gunthorpe <> | Subject | Re: [PATCH 06/12] IB/core: Add optional PCI P2P flag to rdma_rw_ctx_[init|destroy]() |
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On Mon, Jan 8, 2018 at 11:57 AM, Christoph Hellwig <hch@lst.de> wrote:
>> (c) setup/manage any security permissions on mappings >> Which P2P may at some point be concerned with. > > Maybe once root complexes with iommus actually support P2P. But until > then we have a lot more more important problems to solve.
Pretty sure P2P capable IOMMU hardware exists.
With SOC's we also have the scenario that an DMA originated from an on-die device wishes to target an off-die PCI BAR (through the IOMMU), that definitely exists today, and people care about it :)
Jason
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