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

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Date:   Fri, 13 Jan 2017 10:26:41 -0800 (PST)
From:   Stefano Stabellini <sstabellini@...nel.org>
To:     Boris Ostrovsky <boris.ostrovsky@...cle.com>
cc:     Stefano Stabellini <sstabellini@...nel.org>, jgross@...e.com,
        karahmed@...zon.de, linux-kernel@...r.kernel.org,
        xen-devel@...ts.xenproject.org, konrad.wilk@...cle.com
Subject: Re: [PATCH v2] partially revert "xen: Remove event channel notification
 through Xen PCI platform device"

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@...zon.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@...nel.org>
> 
> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@...cle.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?