linux-kernel - Re: [Bugfix v4 0/2] Fix xen IRQ allocation failure caused by commit b81975eade8c

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Date:	Thu, 15 Jan 2015 15:22:37 +0100
From:	Sander Eikelenboom <linux@...elenboom.it>
To:	Jiang Liu <jiang.liu@...ux.intel.com>
CC:	David Vrabel <david.vrabel@...rix.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
	Tony Luck <tony.luck@...el.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [Bugfix v4 0/2] Fix xen IRQ allocation failure caused by commit b81975eade8c


Thursday, January 15, 2015, 2:04:34 PM, you wrote:

> With more knowledge of Xen interrupt manangement subsytem, I realized
> previous three versions to fix https://lkml.org/lkml/2014/12/19/178 are
> just plainly wrong. Those patches try to fix the issue by creating
> irqdomain for IOAPICs for PV domains, which effectively let native
> IOAPIC driver and Xen PV interrupt management subsystem to manage
> IOAPIC irqs concurrently, sounds unpredictable.

> Sorry for those wrong fixes. The good news is that the new fix does
> make code simpler and easier to maintain.

> I have tested the patchset on Intel platform with bare metal and Dom0
> kernels.

> Hi Sander,
>         Could you please help to test it again?

> Regards!
> Gerry

Hi Gerry,

These patches fix the first symptom of the powerbutton not working.

Unfortunately it doesn't fix the second symptoms with pci-passthrough,
the device still doesn't receive irq's on intel and the video device still haas
issues on AMD.

What i have tested extensively and works stable for me is:
david's patch + revert of cffe0a2b5a34c95a4dadc9ec7132690a5b0f6687 "x86, irq: Keep balance of IOAPIC pin reference count" 

Hope that helps in finding the solution.

--
Sander


> Jiang Liu (2):
>   xen/pci: Kill function xen_setup_acpi_sci()
>   xen/pci: Simplify x86/pci/xen.c by killing gsi_override related code

>  arch/x86/kernel/acpi/boot.c |   26 ++++++++---------
>  arch/x86/pci/xen.c          |   68 ++++---------------------------------------
>  2 files changed, 19 insertions(+), 75 deletions(-)


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