Re: [PATCH v6 01/10] mm: add zone device coherent type memory support

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To: David Hildenbrand <david@xxxxxxxxxx>
Subject: Re: [PATCH v6 01/10] mm: add zone device coherent type memory support
From: Jason Gunthorpe <jgg@xxxxxxxxxx>
Date: Fri, 11 Feb 2022 12:45:37 -0400
Cc: Alex Sierra <alex.sierra@xxxxxxx>, akpm@xxxxxxxxxxxxxxxxxxxx, Felix.Kuehling@xxxxxxx, linux-mm@xxxxxxxxx, rcampbell@xxxxxxxxxx, linux-ext4@xxxxxxxxxxxxxxx, linux-xfs@xxxxxxxxxxxxxxx, amd-gfx@xxxxxxxxxxxxxxxxxxxxx, dri-devel@xxxxxxxxxxxxxxxxxxxxx, hch@xxxxxx, jglisse@xxxxxxxxxx, apopple@xxxxxxxxxx, willy@xxxxxxxxxxxxx
In-reply-to: <beb38138-2266-1ff8-cc82-8fe914bed862@redhat.com>
References: <20220201154901.7921-1-alex.sierra@amd.com> <20220201154901.7921-2-alex.sierra@amd.com> <beb38138-2266-1ff8-cc82-8fe914bed862@redhat.com>

On Fri, Feb 11, 2022 at 05:15:25PM +0100, David Hildenbrand wrote:

> ... I'm pretty sure we cannot FOLL_PIN DEVICE_PRIVATE pages

Currently the only way to get a DEVICE_PRIVATE page out of the page
tables is via hmm_range_fault() and that doesn't manipulate any ref
counts.

Jason

Follow-Ups:
- Re: [PATCH v6 01/10] mm: add zone device coherent type memory support
  - From: David Hildenbrand

References:
- [PATCH v6 00/10] Add MEMORY_DEVICE_COHERENT for coherent device memory mapping
  - From: Alex Sierra
- [PATCH v6 01/10] mm: add zone device coherent type memory support
  - From: Alex Sierra
- Re: [PATCH v6 01/10] mm: add zone device coherent type memory support
  - From: David Hildenbrand

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