Re: [PATCH v2 00/10] Copy Offload in NVMe Fabrics with P2P PCI Memory

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Subject: Re: [PATCH v2 00/10] Copy Offload in NVMe Fabrics with P2P PCI Memory
From: Logan Gunthorpe <logang@xxxxxxxxxxxx>
Date: Thu, 1 Mar 2018 12:30:17 -0700
Cc: Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, linux-pci@xxxxxxxxxxxxxxx, linux-nvme@xxxxxxxxxxxxxxxxxxx, linux-rdma <linux-rdma@xxxxxxxxxxxxxxx>, linux-nvdimm <linux-nvdimm@xxxxxxxxxxxx>, linux-block@xxxxxxxxxxxxxxx, Stephen Bates <sbates@xxxxxxxxxxxx>, Christoph Hellwig <hch@xxxxxx>, Jens Axboe <axboe@xxxxxxxxx>, Keith Busch <keith.busch@xxxxxxxxx>, Sagi Grimberg <sagi@xxxxxxxxxxx>, Bjorn Helgaas <bhelgaas@xxxxxxxxxx>, Jason Gunthorpe <jgg@xxxxxxxxxxxx>, Max Gurtovoy <maxg@xxxxxxxxxxxx>, Jérôme Glisse <jglisse@xxxxxxxxxx>, Alex Williamson <alex.williamson@xxxxxxxxxx>, Oliver OHalloran <oliveroh@xxxxxxxxxxx>
In-reply-to: <CAPcyv4h7mcFphv3j_vW-CGxXa2pjQgLqpBOLzHuTzAFzygai-Q@mail.gmail.com>
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On 01/03/18 12:21 PM, Dan Williams wrote:

Note: I think the above means it won't work behind a switch on x86
either, will it ?


The devm_memremap_pages() infrastructure allows placing the memmap in
"System-RAM" even if the hotplugged range is in PCI space. So, even if
it is an issue on some configurations, it's just a simple adjustment
to where the memmap is placed.


Thanks for the confirmation Dan!

Logan

References:
- [PATCH v2 00/10] Copy Offload in NVMe Fabrics with P2P PCI Memory
  - From: Logan Gunthorpe
- Re: [PATCH v2 00/10] Copy Offload in NVMe Fabrics with P2P PCI Memory
  - From: Benjamin Herrenschmidt
- Re: [PATCH v2 00/10] Copy Offload in NVMe Fabrics with P2P PCI Memory
  - From: Benjamin Herrenschmidt
- Re: [PATCH v2 00/10] Copy Offload in NVMe Fabrics with P2P PCI Memory
  - From: Dan Williams

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