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Date: Wed, 16 Feb 2022 13:28:53 -0400 From: Jason Gunthorpe <jgg@...dia.com> To: Felix Kuehling <felix.kuehling@....com> Cc: Christoph Hellwig <hch@....de>, David Hildenbrand <david@...hat.com>, Alex Sierra <alex.sierra@....com>, akpm@...ux-foundation.org, linux-mm@...ck.org, rcampbell@...dia.com, linux-ext4@...r.kernel.org, linux-xfs@...r.kernel.org, amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org, jglisse@...hat.com, apopple@...dia.com, willy@...radead.org 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 audit. eg the gup_fast bug Alistair pointed at needs fixing at least. Jason
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