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Description of problem: libvirt should forbid to define or start 'hostdev' network which contains the same VFs Version-Release number of selected component (if applicable): libvirt-0.10.2-23.el6.x86_64 How reproducible: 100% Steps to Reproduce: # lspci|grep 11:10 11:10.0 Ethernet controller: Intel Corporation 82576 Virtual Function (rev 01) 11:10.1 Ethernet controller: Intel Corporation 82576 Virtual Function (rev 01) 11:10.2 Ethernet controller: Intel Corporation 82576 Virtual Function (rev 01) 11:10.3 Ethernet controller: Intel Corporation 82576 Virtual Function (rev 01) 11:10.4 Ethernet controller: Intel Corporation 82576 Virtual Function (rev 01) 11:10.5 Ethernet controller: Intel Corporation 82576 Virtual Function (rev 01) 11:10.6 Ethernet controller: Intel Corporation 82576 Virtual Function (rev 01) 11:10.7 Ethernet controller: Intel Corporation 82576 Virtual Function (rev 01) # cat host-devnet1.xml <network> <name>hostdev-net1</name> <forward mode='hostdev' managed='yes'> <address type='pci' domain='0x0000' bus='0x11' slot='0x10' function='0x0'/> <address type='pci' domain='0x0000' bus='0x11' slot='0x10' function='0x0'/> <address type='pci' domain='0x0000' bus='0x11' slot='0x10' function='0x0'/> <address type='pci' domain='0x0000' bus='0x11' slot='0x10' function='0x1'/> </forward> </network> # virsh net-define host-devnet1.xml Network hostdev-net1 defined from host-devnet1.xml # virsh net-dumpxml hostdev-net1 <network> <name>hostdev-net1</name> <uuid>a57d0acb-3182-28ad-5c47-aae471ca8084</uuid> <forward mode='hostdev' managed='yes'> <address type='pci' domain='0x0000' bus='0x11' slot='0x10' function='0x0'/> <address type='pci' domain='0x0000' bus='0x11' slot='0x10' function='0x0'/> <address type='pci' domain='0x0000' bus='0x11' slot='0x10' function='0x0'/> <address type='pci' domain='0x0000' bus='0x11' slot='0x10' function='0x1'/> </forward> </network> # cat vfpool.xml <interface type='network'> <source network='hostdev-net1'/> </interface> # virsh start r6 Domain r6 started # virsh attach-device r6 vfpool.xml Device attached successfully # virsh attach-device r6 vfpool.xml error: Failed to attach device from vfpool.xml error: Requested operation is not valid: PCI device 0000:11:10.0 is in use by domain r6 Actual results: libvirt can define or start the 'hostdev' network which contains some identical VFs Expected results: libvirt should forbid to define or start 'hostdev' network which contains some identical VFs Additional info: