Hi all, I'm trying to use multiple pci domain in qemu q35, but I find there might be some issues in peer bridge fixup. In short, pcibios_fixup_peer_bridges function assumes only one pci domain (0) by default. This is OK when as qemu by default uses only one pci domain too. However, if I add another host bridge which is put into pci domain 1 by using _SEG, and a pcie_pci_bridge is attached to the bus 1 under this new pci domain 1 rather than domain 0, the kernel will recognize the bus 01 differently. More specifically, pcibios_fixup_peer_bridges only reads all the buses under domain 0 but it can read the pci bus 01 in pci domain 1 and treat it as a peer bus of 0000:00. The consequence is this 01 bus is recognized as 0000:01, but it should have been recognized as 0001:01. The host bus 0001:00 can be recognized so I guess pcibios_fixup_peer_bridges needs updating to take care of multiple domains? Or is it just an bios issue? I'm not quite sure and I'm open to any suggestions. Thanks, Ziahn
