linux-kernel - Re: [GIT PULL] VFIO fix for v6.0-rc5

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Date:   Fri, 9 Sep 2022 07:53:17 -0400
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Alex Williamson <alex.williamson@...hat.com>,
        John Hubbard <jhubbard@...dia.com>,
        David Hildenbrand <david@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [GIT PULL] VFIO fix for v6.0-rc5

On Fri, Sep 9, 2022 at 6:52 AM Alex Williamson
<alex.williamson@...hat.com> wrote:
>
> VFIO fix for v6.0-rc5
>
>  - Fix zero page refcount leak (Alex Williamson)

Ugh. This is disgusting.

Don't get me wrong - I've pulled this, but I think there's some deeper
problem that made this patch required.

Why is pin_user_pages_remote() taking a reference to a reserved page?
Maybe it just shouldn't (and then obviously we should fix the unpin
case to match too).

Adding a few GUP people to the participants for comments.

Anybody?

            Linus