qemu/docs/pcie_pci_bridge.txt

6 PCIE-to-PCI bridge is a new method for legacy PCI
12 PCIE-to-PCI bridge should now be used for any legacy PCI device usage
15 This generic PCIE-PCI bridge is a cross-platform device,
17 see 'PCIE-PCI bridge hot-plug' section),
25 PCIE-PCI bridge hot-plug
27 Guest OSes require extra efforts to enable PCIE-PCI bridge hot-plug.
36 that is planned to have PCIE-PCI bridge hot-plugged in.
62 At the moment this capability is used only in QEMU generic PCIe root port
63 (-device pcie-root-port). Capability construction function takes all reservation
73 -device pcie-root-port,bus=pcie.0,id=rp1,slot=1 \
74 -device pcie-root-port,bus=pcie.0,id=rp2,slot=2 \
75 -device pcie-root-port,bus=pcie.0,id=rp3,slot=3,bus-reserve=1 \
76 -device pcie-pci-bridge,id=br1,bus=rp1 \
77 -device pcie-pci-bridge,id=br2,bus=rp2 \
81 device_add pcie-pci-bridge,id=br3,bus=rp3 \
89     - 2 PCIE-PCI bridges plugged into 2 different root ports;
92     - PCIE-PCI bridge, plugged into QEMU generic root port;
93     - 2 e1000 cards, one plugged into the cold-plugged PCIE-PCI bridge,
98 The PCIE-PCI bridge can be hot-plugged only into pcie-root-port that
102 Windows 7 and older versions don't support hot-plug devices into the PCIE-PCI bridge.
112 The PCIE-PCI bridge is based on PCI-PCI bridge, but also accumulates PCI Express