linux-kernel - Re: [PATCH v3 1/4] mm: Fix invalid page pointer returned with FOLL

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Message-ID: <012e78aa-fd4a-35c7-5405-752bcd675449@nvidia.com>
Date:   Thu, 3 Feb 2022 13:13:51 -0800
From:   John Hubbard <jhubbard@...dia.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Peter Xu <peterx@...hat.com>, Jason Gunthorpe <jgg@...pe.ca>,
        David Hildenbrand <david@...hat.com>,
        Lukas Bulwahn <lukas.bulwahn@...il.com>,
        Jan Kara <jack@...e.cz>,
        Claudio Imbrenda <imbrenda@...ux.ibm.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org
Subject: Re: [PATCH v3 1/4] mm: Fix invalid page pointer returned with
 FOLL_PIN gups

On 2/3/22 06:00, Christoph Hellwig wrote:
> On Thu, Feb 03, 2022 at 01:32:29AM -0800, John Hubbard wrote:
>> From: Peter Xu <peterx@...hat.com>
>>
>> Alex reported invalid page pointer returned with pin_user_pages_remote() from
>> vfio after upstream commit 4b6c33b32296 ("vfio/type1: Prepare for batched
>> pinning with struct vfio_batch").  This problem breaks NVIDIA vfio mdev.
> 
> There still isn't any nvidia vfio mdev driver in the tree, so this
> changelog stilldoesn't make sense.

I'll remove that last sentence (and put in a tiny note that I'm scribbling
on Peter's commit description a little bit more), in order to avoid any
references to out of tree things.

thanks,
-- 
John Hubbard
NVIDIA