linux-kernel - Re: [Bugfix 0/3] Xen IRQ related hotfixes for v3.19

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Date:	Tue, 10 Feb 2015 14:31:13 +0100
From:	Stefan Bader <stefan.bader@...onical.com>
To:	Sander Eikelenboom <linux@...elenboom.it>
CC:	Jiang Liu <jiang.liu@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	David Vrabel <david.vrabel@...rix.com>,
	Tony Luck <tony.luck@...el.com>, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org
Subject: Re: [Bugfix 0/3] Xen IRQ related hotfixes for v3.19

On 09.02.2015 20:15, Sander Eikelenboom wrote:
> 
> Monday, February 9, 2015, 5:09:44 PM, you wrote:
> 
>> On 09.02.2015 13:29, Stefan Bader wrote:
>>> On 09.02.2015 13:12, Jiang Liu wrote:
>>>> On 2015/2/9 17:47, Stefan Bader wrote:
>>>>> On 05.02.2015 21:07, Sander Eikelenboom wrote:
>>>>>>
>>>>>> Tuesday, January 20, 2015, 3:21:04 AM, you wrote:
>>>>>>
>>>>>>> Hi Thomas,
>>>>>>>         This patch set includes three hotfixes related Xen IRQ for v3.19.
>>>>>>> Sorry for the long delay to get these two regressions fixed, it really
>>>>>>> cost me some time to read and understand Xen IRQ code.
>>>>>>
>>>>>>> Patch 1 fixes the failure to register ACPI SCI interrupt on Xen
>>>>>>> domain0 by reworking acpi_gsi_to_irq(). I will backport it to v3.18
>>>>>>> too once it reaches the mainstream kernel.
>>>>>>
>>>>>>> Patch 2 fixes the regression in Xen PCI device passthrough(pciback).
>>>>>>> It's a temporary solution, I will send the formal fix for v3.20 and
>>>>>>> it has passed tests too.
>>>>>>
>>>>>>> Patch 3 fixes an issue found when reading code. There's no real bug
>>>>>>> reports related to this issue yet.
>>>>>>
>>>>>>> Great thanks to Konrad and Sander for testing fixes for these regressions.
>>>>>>
>>>>>>> Regards,
>>>>>>> Gerry
>>>>>>
>>>>>> Hi Gerry,
>>>>>>
>>>>>> Since these patches now are: tested, reviewed and have landed into mainline,
>>>>>> could you also provide the backports for 3.17 and 3.18 where required ?
>>>>>
>>>>> This would be my attempt of backporting those to 3.18 (I have not tried whether
>>>>> they would apply to 3.17 as well). Those seem to work when test-booting and
>>>>> Sander said he will give them a try as well. But better check yourself I did not
>>>>> mess anything up while backporting. One of the three patches seemed not to be
>>>>> required at all.
>>>> I'm backporting them too, but now I will give up my patches:)
>>>>
>>>> The first one is a must, which should be applied to 3.17 and 3.18.
>>>> The second one doesn't apply to 3.17 or 3.18.
>>>> The third may be applied to v3.17 and v3.18, but it shouldn't be applied
>>>> according to the stable-kernel doc because no user reports such a bug yet.
>>>
>>> Hm, ok. So maybe I should retry with only patch#1 and verify that alone gets
>>> around the acpi irq and the usb problems, too. Though interestingly from the
>>> history, the acpi irq I saw in 3.17 while the usb devices started to fail with
>>> 3.18. I will let you know in a bit. Just want to finish another bisect first.
> 
>> So it looks like patch #1 indeed does fix both the acpi irq and my usb devices.
>> Sander, do you want to verify that variant, too?
> 
> Hi Stefan / Gerry,
> 
> Just tested with only patch 1, ended up the same .. the reported issues seem 
> gone.

Sounds good. :) Gerry, do you want me to fwd the backport to Greg for 3.18 or do
you do that? As far as I know 3.17 has nobody caring about it.

-Stefan

> 
> 
>> The only odd thing left in a 3.18 with the fix (regardless of using patch #1
>> only or patches #1 and #3) is that the ahci driver shows up with its pci bus
>> number in /proc/interrupts. But that does not seem to have any relevant downside
>> (cannot try 3.19 on that box right now for other reasons).
> 
>> -Stefan
> 
>> ...
>> # 57: 12441  0    0    0  xen-pirq-msi       0000:00:1f.2
>> #                                            (used to be ahci)
> 
> This is also there on baremetal with 3.19 on intel, so not xen related:
>  27:       1868        582       1282        555  IR-PCI-MSI-edge      0000:00:1f.2
> 
> --
> Sander
> 
>>>
>>> -Stefan
>>>
>>>> Regards
>>>> Gerry
>>>>>
>>>>> -Stefan
>>>>>
>>>>>>
>>>>>> The number of people running into these (subtle) issues with these stable
>>>>>> kernels seems to be steadily increasing.
>>>>>>
>>>>>> --
>>>>>> Sander
>>>>>>
>>>>>>> Jiang Liu (3):
>>>>>>>   xen/pci: Kill function xen_setup_acpi_sci()
>>>>>>>   xen/irq, ACPI: Fix regression in xen PCI passthrough caused by
>>>>>>>     cffe0a2b5a34
>>>>>>>   xen/irq: Override ACPI IRQ management callback __acpi_unregister_gsi
>>>>>>
>>>>>>>  arch/x86/include/asm/acpi.h |    1 +
>>>>>>>  arch/x86/kernel/acpi/boot.c |   26 +++++++++++------------
>>>>>>>  arch/x86/pci/xen.c          |   49 ++-----------------------------------------
>>>>>>>  drivers/acpi/pci_irq.c      |    1 -
>>>>>>>  4 files changed, 16 insertions(+), 61 deletions(-)
>>>>>>
>>>>>>
>>>>>
>>>
>>>
> 
> 
> 



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