[libvirt] It's said 'when the guest has PCI passthrough devices in use, operations like migration/save/restore are not possible.' where are the corresponding codes in xen? '

[bobooscar <bobooscar gmail com>]

It's said 'when the guest has PCI passthrough devices in use, operations like migration/save/restore are not possible.' where are the corresponding codes in xen?  I'm wondering how xend/xenlight tells whether a guest has a pci passthu device in use or not. 

      thank you in advance! 

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