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由 Laine Stump 提交于
Andrea had the right idea when he disabled the "reserve an extra unused slot" bit for aarch64/virt. For *any* PCI Express-based machine, it is pointless since 1) an extra legacy-PCI slot can't be used for hotplug, since hotplug into legacy PCI slots doesn't work on PCI Express machinetypes, and 2) even for "coldplug" expansion, everybody will want to expand using Express controllers, not legacy PCI. This patch eliminates the extra slot reserve unless the system has a pci-root (i.e. legacy PCI)
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