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

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Date:   Mon, 16 Jan 2017 07:16:29 +0100
From:   Juergen Gross <jgross@...e.com>
To:     Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Stefano Stabellini <sstabellini@...nel.org>
Cc:     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 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@...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?

Originally I didn't plan to, but I'm not opposed to sending out one.


Juergen