Re: [Qemu-devel] Qemu and PCI Interrupt Link?

[Peter Lieven <pl@kamp.de>]

Am 05.07.2016 um 22:53 schrieb Paolo Bonzini:
>
> On 05/07/2016 20:30, Laszlo Ersek wrote:
>> On 07/04/16 15:14, Peter Lieven wrote:
>>> Hi,
>>>
>>> i noticed that newer guest kernels emit the following message at startup:
>>>
>>> ACPI: No IRQ available for PCI Interrupt Link [LNKS]. Try pci=noacpi or
>>> acpi=off
>>>
>>> Cmdline:
>>> x86_64-softmmu/qemu-system-x86_64 -enable-kvm -m 2048 -cdrom
>>> ~/Downloads/ubuntu-16.04-desktop-amd64.iso
>>>
>>> Is this expected?
>> This seems to come from kernel commit 5ebc76035303. Thankfully the
>> commit message is quite detailed.
>>
>> The commit message makes me think that the kernel patch is incorrect. It
>> certainly seems to conflict with the following SeaBIOS commit:
>>
>> commit f64a472a481784231fbf8541825501df411b11d1
>> Author: Paolo Bonzini <pbonzini@redhat.com>
>> Date:   Thu Dec 13 08:42:02 2012 +0100
>>
>>      acpi: reintroduce LNKS
>>
>> That SeaBIOS patch is where we have the identical functionality in QEMU
>> from (see QEMU commits 74523b850189a and c35b6e8032105).
> The error is harmless.  LNKS has been there forever and I suspect no one
> really knows why it was introduced in the first place.  The link for the
> device that uses LNKS probably can be changed back to LNKA since the SCI
> is specified in the FADT, but again---who knows why it was changed.

Okay, so just ignore this message for good or is there anything futher
I can/should do?

Peter