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[$] Controlling device peer-to-peer access from user space
Thursday March 7, 2019. 09:39 PM , from LWN.net
The recent addition of
support for direct (peer-to-peer) operations between PCIe devices in the kernel has opened the door for different use cases. The initial work concentrated on in-kernel support and the NVMe subsystem; it also added support for memory regions that can be used for such transfers. Jérôme Glisse recently proposed two extensions that would allow the mapping of those regions into user space and mapping device files between two devices. The resulting discussion surprisingly led to consideration of the future of core kernel structures dealing with memory management.
https://lwn.net/Articles/782489/rss
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