linux-kernel - acpi PNP0A03:00: fail to add MMCONFIG information, can't access extended PCI configuration space under this bridge.

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Message-ID: <f42e3f0f-2156-669a-e15e-51970b438ed4@molgen.mpg.de>
Date:   Mon, 15 Feb 2021 17:53:51 +0100
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, Bjorn Helgaas <bhelgaas@...gle.com>
Cc:     linux-pci@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        it+x86@...gen.mpg.de
Subject: acpi PNP0A03:00: fail to add MMCONFIG information, can't access
 extended PCI configuration space under this bridge.

Dear Linux folks,


All the way up to QEMU emulator version 5.2.0 (Debian 1:5.2+dfsg-5) and 
Linux 5.10.13, Linux logs the warning below:

     acpi PNP0A03:00: fail to add MMCONFIG information, can't access 
extended PCI configuration space under this bridge.

One way to reproduce it:

     qemu-system-x86_64 -enable-kvm -m 2G -hda /dev/shm/debian.img 
-kernel /boot/vmlinuz-5.10.0-3-amd64 -initrd 
/boot/initrd.img-5.10.0-3-amd64 -append root="/dev/sda1 
console=ttyS0,115200" -serial stdio

Please find more details and the full log in the Bugzilla issue #211765 [1].


Kind regards,

Paul


[1]: https://bugzilla.kernel.org/show_bug.cgi?id=211765
      "[Bug 211765] acpi PNP0A03:00: fail to add MMCONFIG information, 
can't access extended PCI configuration space under this bridge."