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Date:   Wed, 16 Feb 2022 13:28:53 -0400
From:   Jason Gunthorpe <>
To:     Felix Kuehling <>
Cc:     Christoph Hellwig <>,
        David Hildenbrand <>,
        Alex Sierra <>,,,,,,,,,,
Subject: Re: [PATCH v6 01/10] mm: add zone device coherent type memory support

On Wed, Feb 16, 2022 at 11:56:51AM -0500, Felix Kuehling wrote:

> In the case of DEVICE_COHERENT memory, the pfns correspond to real physical
> memory addresses. I don't think they have those PFN_DEV|PFN_MAP bits set.

So do DAX pages. The PTE flag does several things. As this would be
the first time ZONE_DEVICE pages do not set devmap it needs a full

eg the gup_fast bug Alistair pointed at needs fixing at least.


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