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

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Message-ID: <c465d3a5-aaae-30d7-fcee-0705d14fa741@oracle.com>
Date:   Fri, 13 Jan 2017 13:44:27 -0500
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Stefano Stabellini <sstabellini@...nel.org>
Cc:     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 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@...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?

Juergen?

BTW, this probably wants to go to 4.9-stable too?

-boris