linux-ext4 - Re: [PATCH v6 01/10] mm: add zone device coherent type memory support

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Tue, 15 Feb 2022 19:32:09 +0100
From:   Christoph Hellwig <hch@....de>
To:     Jason Gunthorpe <jgg@...dia.com>
Cc:     David Hildenbrand <david@...hat.com>,
        Felix Kuehling <felix.kuehling@....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,
        hch@....de, jglisse@...hat.com, apopple@...dia.com,
        willy@...radead.org
Subject: Re: [PATCH v6 01/10] mm: add zone device coherent type memory
 support

On Tue, Feb 15, 2022 at 10:45:24AM -0400, Jason Gunthorpe wrote:
> > Do you know if DEVICE_GENERIC pages would end up as PageAnon()? My
> > assumption was that they would be part of a special mapping.
> 
> We need to stop using the special PTEs and VMAs for things that have a
> struct page. This is a mistake DAX created that must be undone.

Yes, we'll get to it.  Maybe we can do it for the non-DAX devmap
ptes first given that DAX is more complicated.