linux-kernel - Re: [PATCH 04/15] mm: remove the pgmap field from struct hmm_vma

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Message-ID: <20190816044448.GB4093@lst.de>
Date:   Fri, 16 Aug 2019 06:44:48 +0200
From:   Christoph Hellwig <hch@....de>
To:     Jason Gunthorpe <jgg@...lanox.com>
Cc:     Jerome Glisse <jglisse@...hat.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Christoph Hellwig <hch@....de>,
        Ben Skeggs <bskeggs@...hat.com>,
        Felix Kuehling <Felix.Kuehling@....com>,
        Ralph Campbell <rcampbell@...dia.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "nouveau@...ts.freedesktop.org" <nouveau@...ts.freedesktop.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "amd-gfx@...ts.freedesktop.org" <amd-gfx@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 04/15] mm: remove the pgmap field from struct
 hmm_vma_walk

On Fri, Aug 16, 2019 at 12:43:07AM +0000, Jason Gunthorpe wrote:
> On Thu, Aug 15, 2019 at 04:51:33PM -0400, Jerome Glisse wrote:
> 
> > struct page. In this case any way we can update the
> > nouveau_dmem_page() to check that page page->pgmap == the
> > expected pgmap.
> 
> I was also wondering if that is a problem.. just blindly doing a
> container_of on the page->pgmap does seem like it assumes that only
> this driver is using DEVICE_PRIVATE.
> 
> It seems like something missing in hmm_range_fault, it should be told
> what DEVICE_PRIVATE is acceptable to trigger HMM_PFN_DEVICE_PRIVATE
> and fault all others?

The whole device private handling in hmm and migrate_vma seems pretty
broken as far as I can tell, and I have some WIP patches.  Basically we
should not touch (or possibly eventually call migrate to ram eventually
in the future) device private pages not owned by the caller, where I
try to defined the caller by the dev_pagemap_ops instance.