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Date:   Thu, 30 Aug 2018 15:20:12 -0400
From:   Jerome Glisse <>
To:     Logan Gunthorpe <>
        Stephen Bates <>,
        Christoph Hellwig <>,
        Keith Busch <>,
        Sagi Grimberg <>,
        Bjorn Helgaas <>,
        Jason Gunthorpe <>,
        Max Gurtovoy <>,
        Dan Williams <>,
        Benjamin Herrenschmidt <>,
        Alex Williamson <>,
        Christian König <>
Subject: Re: [PATCH v5 00/13] Copy Offload in NVMe Fabrics with P2P PCI Memory

On Thu, Aug 30, 2018 at 12:53:39PM -0600, Logan Gunthorpe wrote:


> When the PCI P2PDMA config option is selected the ACS bits in every
> bridge port in the system are turned off to allow traffic to
> pass freely behind the root port. At this time, the bit must be disabled
> at boot so the IOMMU subsystem can correctly create the groups, though
> this could be addressed in the future. There is no way to dynamically
> disable the bit and alter the groups.

Can you provide an example on how to test this ? Like kernel command
line option, the doc patch does not have any such example. It would be
nice to add.

Maybe i have miss it in some of the patch. I just skimmed over for


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