From: Jason Gunthorpe <jgg@ziepe.ca>
To: Christoph Hellwig <hch@lst.de>
Cc: "Logan Gunthorpe" <logang@deltatee.com>,
"open list" <linux-kernel@vger.kernel.org>,
linux-pci@vger.kernel.org, linux-nvme@lists.infradead.org,
linux-rdma <linux-rdma@vger.kernel.org>,
linux-nvdimm@lists.01.org, linux-block@vger.kernel.org,
"Stephen Bates" <sbates@raithlin.com>,
"Jens Axboe" <axboe@kernel.dk>,
"Keith Busch" <keith.busch@intel.com>,
"Sagi Grimberg" <sagi@grimberg.me>,
"Bjorn Helgaas" <bhelgaas@google.com>,
"Max Gurtovoy" <maxg@mellanox.com>,
"Dan Williams" <dan.j.williams@intel.com>,
"Jérôme Glisse" <jglisse@redhat.com>,
"Benjamin Herrenschmidt" <benh@kernel.crashing.org>
Subject: Re: [PATCH 06/12] IB/core: Add optional PCI P2P flag to rdma_rw_ctx_[init|destroy]()
Date: Mon, 8 Jan 2018 12:49:50 -0700 [thread overview]
Message-ID: <20180108194950.GK11348@ziepe.ca> (raw)
In-Reply-To: <20180108185743.GA15936@lst.de>
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
next prev parent reply other threads:[~2018-01-08 19:49 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-04 19:01 [PATCH 00/11] Copy Offload in NVMe Fabrics with P2P PCI Memory Logan Gunthorpe
2018-01-04 19:01 ` [PATCH 01/12] pci-p2p: Support peer to peer memory Logan Gunthorpe
2018-01-04 21:40 ` Bjorn Helgaas
2018-01-04 23:06 ` Logan Gunthorpe
2018-01-04 21:59 ` Bjorn Helgaas
2018-01-05 0:20 ` Logan Gunthorpe
2018-01-04 19:01 ` [PATCH 02/12] pci-p2p: Add sysfs group to display p2pmem stats Logan Gunthorpe
2018-01-04 21:50 ` Bjorn Helgaas
2018-01-04 22:25 ` Jason Gunthorpe
2018-01-04 23:13 ` Logan Gunthorpe
2018-01-04 19:01 ` [PATCH 03/12] pci-p2p: Add PCI p2pmem dma mappings to adjust the bus offset Logan Gunthorpe
2018-01-04 19:01 ` [PATCH 04/12] pci-p2p: Clear ACS P2P flags for all client devices Logan Gunthorpe
2018-01-04 21:57 ` Bjorn Helgaas
2018-01-04 22:35 ` Alex Williamson
2018-01-05 0:00 ` Logan Gunthorpe
2018-01-05 1:09 ` Logan Gunthorpe
2018-01-05 3:33 ` Alex Williamson
2018-01-05 6:47 ` Jerome Glisse
2018-01-05 15:41 ` Alex Williamson
2018-01-05 17:10 ` Logan Gunthorpe
2018-01-05 17:18 ` Alex Williamson
2018-01-04 19:01 ` [PATCH 05/12] block: Introduce PCI P2P flags for request and request queue Logan Gunthorpe
2018-01-04 19:01 ` [PATCH 06/12] IB/core: Add optional PCI P2P flag to rdma_rw_ctx_[init|destroy]() Logan Gunthorpe
2018-01-04 19:22 ` Jason Gunthorpe
2018-01-04 19:52 ` Logan Gunthorpe
2018-01-04 22:13 ` Jason Gunthorpe
2018-01-04 23:44 ` Logan Gunthorpe
2018-01-05 4:50 ` Jason Gunthorpe
2018-01-08 14:59 ` Christoph Hellwig
2018-01-08 18:09 ` Jason Gunthorpe
2018-01-08 18:17 ` Logan Gunthorpe
2018-01-08 18:29 ` Jason Gunthorpe
2018-01-08 18:34 ` Christoph Hellwig
2018-01-08 18:44 ` Logan Gunthorpe
2018-01-08 18:57 ` Christoph Hellwig
2018-01-08 19:05 ` Logan Gunthorpe
2018-01-09 16:47 ` Christoph Hellwig
2018-01-08 19:49 ` Jason Gunthorpe [this message]
2018-01-09 16:46 ` Christoph Hellwig
2018-01-09 17:10 ` Jason Gunthorpe
2018-01-08 19:01 ` Jason Gunthorpe
2018-01-09 16:55 ` Christoph Hellwig
2018-01-04 19:01 ` [PATCH 07/12] nvme-pci: clean up CMB initialization Logan Gunthorpe
2018-01-04 19:08 ` Logan Gunthorpe
2018-01-04 19:01 ` [PATCH 08/12] nvme-pci: clean up SMBSZ bit definitions Logan Gunthorpe
2018-01-04 19:08 ` Logan Gunthorpe
2018-01-04 19:01 ` [PATCH 09/12] nvme-pci: Use PCI p2pmem subsystem to manage the CMB Logan Gunthorpe
2018-01-05 15:30 ` Marta Rybczynska
2018-01-05 18:14 ` Logan Gunthorpe
2018-01-05 18:11 ` Keith Busch
2018-01-05 18:19 ` Logan Gunthorpe
2018-01-05 19:01 ` Keith Busch
2018-01-05 19:04 ` Logan Gunthorpe
2018-01-04 19:01 ` [PATCH 10/12] nvme-pci: Add support for P2P memory in requests Logan Gunthorpe
2018-01-04 19:01 ` [PATCH 11/12] nvme-pci: Add a quirk for a pseudo CMB Logan Gunthorpe
2018-01-04 19:01 ` [PATCH 12/12] nvmet: Optionally use PCI P2P memory Logan Gunthorpe
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