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From: logang@deltatee.com (Logan Gunthorpe)
Subject: [PATCH 04/12] pci-p2p: Clear ACS P2P flags for all client devices
Date: Thu, 4 Jan 2018 18:09:43 -0700	[thread overview]
Message-ID: <99420cc9-48fd-5692-8426-bd5c2ec0dcf7@deltatee.com> (raw)
In-Reply-To: <20fdb5bb-0236-c093-ed53-e12664022f53@deltatee.com>



On 04/01/18 05:00 PM, Logan Gunthorpe wrote:
> 
> 
> On 04/01/18 03:35 PM, Alex Williamson wrote:
>> Yep, flipping these ACS bits invalidates any IOMMU groups that depend
>> on the isolation of that downstream port and I suspect also any peers
>> within the same PCI slot of that port and their downstream devices.? The
>> entire sub-hierarchy grouping needs to be re-evaluated.? This
>> potentially affects running devices that depend on that isolation, so
>> I'm not sure how that happens dynamically.? A boot option might be
>> easier.? Thanks,
> 

Also, considering this further: if you can point me to a way to tell if
a device is in an IOMMU group it should be pretty easy to disallow a
device that has been assigned to a group from being used in P2P
transactions.

Logan

  reply	other threads:[~2018-01-05  1:09 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 [this message]
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
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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