Re: [PATCH v2] partially revert "xen: Remove event channel notification through Xen PCI platform device"

From	Stefano Stabellini <sstabellini@kernel.org>
Newsgroups	linux.kernel
Subject	Re: [PATCH v2] partially revert "xen: Remove event channel notification through Xen PCI platform device"
Date	2017-01-17 01:50 +0100
Message-ID	<t0q8h-8kb-3@gated-at.bofh.it> (permalink)
References	<sYVpU-DA-25@gated-at.bofh.it> <sZaIh-1Qx-9@gated-at.bofh.it> <sZeLT-4cm-1@gated-at.bofh.it> <sZf5g-4iZ-29@gated-at.bofh.it> <t08O5-4Iq-7@gated-at.bofh.it>
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On Mon, 16 Jan 2017, Juergen Gross wrote:
> On 13/01/17 19:44, Boris Ostrovsky wrote:
> > On 01/13/2017 01:26 PM, Stefano Stabellini wrote:
> >> On Fri, 13 Jan 2017, Boris Ostrovsky wrote:
> >>> On 01/12/2017 04:39 PM, Stefano Stabellini wrote:
> >>>> The following commit:
> >>>>
> >>>> commit 72a9b186292d98494f222226cfd24a1621796209
> >>>> Author: KarimAllah Ahmed <karahmed@amazon.de>
> >>>> Date:   Fri Aug 26 23:55:36 2016 +0200
> >>>>
> >>>>     xen: Remove event channel notification through Xen PCI platform device
> >>>>
> >>>> broke Linux when booting as Dom0 on Xen in a nested Xen environment (Xen
> >>>> installed inside a Xen VM). In this scenario, Linux is a PV guest, but
> >>>> at the same time it uses the platform-pci driver to receive
> >>>> notifications from L0 Xen. vector callbacks are not available because L1
> >>>> Xen doesn't allow them.
> >>>>
> >>>> Partially revert the offending commit, by restoring IRQ based
> >>>> notifications for PV guests only. I restored only the code which is
> >>>> strictly needed and replaced the xen_have_vector_callback checks within
> >>>> it with xen_pv_domain() checks.
> >>>>
> >>>> Signed-off-by: Stefano Stabellini <sstabellini@kernel.org>
> >>> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
> >> Applied to xentip/for-linus-4.10, improving the commit message as
> >> suggested before.
> >>
> >> Do you plan on sending out another pull request for 4.10?
> > 
> > Juergen?
> 
> Originally I didn't plan to, but I'm not opposed to sending out one.

I think that would be best.

Thanks,

Stefano

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[PATCH v2] partially revert "xen: Remove event channel notification  through Xen PCI platform device" Stefano Stabellini <sstabellini@kernel.org> - 2017-01-12 22:50 +0100
  Re: [PATCH v2] partially revert "xen: Remove event channel  notification through Xen PCI platform device" Boris Ostrovsky <boris.ostrovsky@oracle.com> - 2017-01-13 15:10 +0100
    Re: [PATCH v2] partially revert "xen: Remove event channel notification  through Xen PCI platform device" Stefano Stabellini <sstabellini@kernel.org> - 2017-01-13 19:30 +0100
      Re: [PATCH v2] partially revert "xen: Remove event channel  notification through Xen PCI platform device" Boris Ostrovsky <boris.ostrovsky@oracle.com> - 2017-01-13 19:50 +0100
        Re: [PATCH v2] partially revert "xen: Remove event channel  notification through Xen PCI platform device" Juergen Gross <jgross@suse.com> - 2017-01-16 07:20 +0100
          Re: [PATCH v2] partially revert "xen: Remove event channel notification  through Xen PCI platform device" Stefano Stabellini <sstabellini@kernel.org> - 2017-01-17 01:50 +0100

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