From: Bjorn Helgaas <helgaas@kernel.org>
To: Paul Menzel <pmenzel@molgen.mpg.de>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
x86@kernel.org, Bjorn Helgaas <bhelgaas@google.com>,
linux-pci@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>,
it+x86@molgen.mpg.de, Robert Dinse <nanook@eskimo.com>
Subject: Re: acpi PNP0A03:00: fail to add MMCONFIG information, can't access extended PCI configuration space under this bridge.
Date: Fri, 29 Jul 2022 17:22:38 -0500 [thread overview]
Message-ID: <20220729222238.GA491273@bhelgaas> (raw)
In-Reply-To: <f42e3f0f-2156-669a-e15e-51970b438ed4@molgen.mpg.de>
[+cc Robert]
On Mon, Feb 15, 2021 at 05:53:51PM +0100, Paul Menzel wrote:
> 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."
Do you know whether qemu implements extended config space? Extended
config space is offsets 0x100-0xfff. I think Linux only supports
extended capabilities in that area (AER, VC, ACS, SR-IOV, etc). Most
of these are probably not of interest in a virtualized environment, so
I wouldn't be surprised if qemu doesn't support them.
Bjorn
prev parent reply other threads:[~2022-07-29 22:22 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-15 16:53 acpi PNP0A03:00: fail to add MMCONFIG information, can't access extended PCI configuration space under this bridge Paul Menzel
2022-07-29 22:22 ` Bjorn Helgaas [this message]
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