On 12/25/2012 07:06 AM, bobooscar wrote:

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!

In the case of qemu, the prohibition on migrating a passthrough device is enforced by qemu; all libvirt can do is repeat those same checks if it will give a nicer error message rather than waiting for qemu to issue the final determination on whether it makes sense. I'm not sure how xen prevents passthrough migration, but given how it is done in qemu, you may have to look through the xen source code instead of asking how libvirt does it. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org