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Re: [Qemu-devel] Qemu and PCI Interrupt Link?
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From: |
Laszlo Ersek |
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Subject: |
Re: [Qemu-devel] Qemu and PCI Interrupt Link? |
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Date: |
Tue, 5 Jul 2016 20:30:24 +0200 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.1.1 |
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 <address@hidden>
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).
Thanks
Laszlo