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s390x/pci: handle PCIBridge bus number
The PCI bus number is usually set by the host during the enumeration. In the s390 architecture we neither get a Device Tree nor have an enumeration understanding bridge devices. Let's fake the enumeration on reset and set the PCI_PRIMARY_BUS, PCI_SECONDARY_BUS and PCI_SUBORDINATE_BUS config entries for the bridges. Let's add the configuration of these three config entries on bridge hot plug. The bus number is calculated based on a new entry, bus_num of the S390pciState device. This commit is inspired by what spapr pci does. Signed-off-by: Pierre Morel <pmorel@linux.vnet.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
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