linux-kernel - Re: [PATCH 1/2] mm: provide a sane PTE walking API for modules

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Message-ID: <20210209081408.GA1703597@infradead.org>
Date:   Tue, 9 Feb 2021 08:14:08 +0000
From:   Christoph Hellwig <hch@...radead.org>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Christoph Hellwig <hch@...radead.org>,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org, jgg@...pe.ca,
        linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
        dan.j.williams@...el.com, Daniel Vetter <daniel@...ll.ch>
Subject: Re: [PATCH 1/2] mm: provide a sane PTE walking API for modules

On Mon, Feb 08, 2021 at 07:18:56PM +0100, Paolo Bonzini wrote:
> Fair enough.  I would expect that pretty much everyone using follow_pfn will
> at least want to switch to this one (as it's less bad and not impossible to
> use correctly), but I'll squash this in:


Daniel looked into them, so he may correct me, but the other follow_pfn
users and their destiny are:

 - SGX, which is not modular and I think I just saw a patch to kill them
 - v4l videobuf and frame vector: I think those are going away
   entirely as they implement a rather broken pre-dmabuf P2P scheme
 - vfio: should use MMU notifiers eventually

Daniel, what happened to your follow_pfn series?