[+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
