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

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Date:	Mon, 09 Feb 2015 13:29:47 +0100
From:	Stefan Bader <stefan.bader@...onical.com>
To:	Jiang Liu <jiang.liu@...ux.intel.com>,
	Sander Eikelenboom <linux@...elenboom.it>
CC:	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 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.

-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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