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From:   Andreas Gruenbacher <agruenba@redhat.com>
Date:   Tue, 16 Nov 2021 15:00:19 +0100
Message-ID: <CAHc6FU7BU2-B2x=JV0HtLci6=mGy2XxLNNGh1f4DGtVbeJFcVA@mail.gmail.com>
Subject: Re: [PATCH 5.4 063/355] powerpc/kvm: Fix kvm_use_magic_page
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc:     Sasha Levin <sashal@kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        stable <stable@vger.kernel.org>,
        Mathieu Malaterre <malat@debian.org>,
        Paul Mackerras <paulus@ozlabs.org>, kvm-ppc@vger.kernel.org
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On Tue, Nov 16, 2021 at 2:57 PM Greg Kroah-Hartman
<gregkh@linuxfoundation.org> wrote:
> On Tue, Nov 16, 2021 at 02:54:10PM +0100, Andreas Gruenbacher wrote:
> > On Tue, Nov 16, 2021 at 1:54 AM Sasha Levin <sashal@kernel.org> wrote:
> > > On Mon, Nov 15, 2021 at 06:47:41PM +0100, Andreas Gruenbacher wrote:
> > > >Greg,
> > > >
> > > >On Mon, Nov 15, 2021 at 6:10 PM Greg Kroah-Hartman
> > > ><gregkh@linuxfoundation.org> wrote:
> > > >> From: Andreas Gruenbacher <agruenba@redhat.com>
> > > >>
> > > >> commit 0c8eb2884a42d992c7726539328b7d3568f22143 upstream.
> > > >>
> > > >> When switching from __get_user to fault_in_pages_readable, commit
> > > >> 9f9eae5ce717 broke kvm_use_magic_page: like __get_user,
> > > >> fault_in_pages_readable returns 0 on success.
> > > >
> > > >I've not heard back from the maintainers about this patch so far, so
> > > >it would probably be safer to leave it out of stable for now.
> > >
> > > What do you mean exactly? It's upstream.
> >
> > Mathieu Malaterre broke this test in 2018 (commit 9f9eae5ce717) but
> > that wasn't noticed until now (commit 0c8eb2884a42). This means that
> > this fix probably isn't critical, so I shouldn't be backported.
>
> Then why did you tag it to be explicitly backported to all stable
> kernels newer than 4.18?

Well, sorry for that. What else do you expect me to do in addition to
pointing out the mistake?

Thanks,
Andreas