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The argument is the list of PCI BDFs: > + xen-pciback.hide=(03:00.0)(04:00.0) > + > + If in doubt, say m. > + > config XEN_PCIDEV_BACKEND > tristate "Xen PCI-device backend driver" > depends on PCI && X86 && XEN > depends on XEN_BACKEND > + select XEN_PCI_STUB Does kconfig not at least warn about this? The selected item has a "depends on !X88" conflicting with the "depends on X86" here. Jan