Hi, All I want to use the SR-IOV of intel 82576 NIC. I enabled IOMMU and VT-d and SR-IOV in BIOS. And enabled VT-d in kernel. The OS information is bellow: [root@host3 nova]# cat /etc/redhat-release CentOS Linux release 7.1.1503 (Core) [root@host3 nova]# uname -an Linux host3.localdomain 3.10.0-229.el7.x86_64 #1 SMP Fri Mar 6 11:36:42 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux [root@host3 nova]# rpm -qa|grep qemu libvirt-daemon-driver-qemu-1.2.8-16.el7.x86_64 qemu-kvm-1.5.3-86.el7.x86_64 qemu-kvm-common-1.5.3-86.el7.x86_64 ipxe-roms-qemu-20130517-6.gitc4bce43.el7.noarch qemu-img-1.5.3-86.el7.x86_64 [root@host3 nova]# rpm -qa|grep libvirt libvirt-daemon-1.2.8-16.el7.x86_64 libvirt-daemon-driver-nwfilter-1.2.8-16.el7.x86_64 libvirt-python-1.2.8-7.el7.x86_64 libvirt-daemon-driver-storage-1.2.8-16.el7.x86_64 libvirt-daemon-driver-qemu-1.2.8-16.el7.x86_64 libvirt-daemon-config-nwfilter-1.2.8-16.el7.x86_64 libvirt-daemon-driver-secret-1.2.8-16.el7.x86_64 libvirt-daemon-driver-interface-1.2.8-16.el7.x86_64 libvirt-client-1.2.8-16.el7.x86_64 libvirt-glib-0.1.7-3.el7.x86_64 libvirt-daemon-driver-network-1.2.8-16.el7.x86_64 libvirt-daemon-driver-nodedev-1.2.8-16.el7.x86_64 libvirt-daemon-kvm-1.2.8-16.el7.x86_64 And I can see the vf of the NIC after ‘ echo '7' > /sys/class/net/ens1f1/device/sriov_numvfs ' [root@host3 VTS2.1-demo]# lspci |grep -i ethernet 08:00.0 Ethernet controller: QLogic Corp. 10GbE Converged Network Adapter (TCP/IP Networking) (rev 02) 08:00.1 Ethernet controller: QLogic Corp. 10GbE Converged Network Adapter (TCP/IP Networking) (rev 02) 0f:00.0 Ethernet controller: Intel Corporation 82576 Gigabit Network Connection (rev 01) 0f:00.1 Ethernet controller: Intel Corporation 82576 Gigabit Network Connection (rev 01) 10:10.1 Ethernet controller: Intel Corporation 82576 Virtual Function (rev 01) 10:10.3 Ethernet controller: Intel Corporation 82576 Virtual Function (rev 01) 10:10.5 Ethernet controller: Intel Corporation 82576 Virtual Function (rev 01) 10:10.7 Ethernet controller: Intel Corporation 82576 Virtual Function (rev 01) 10:11.1 Ethernet controller: Intel Corporation 82576 Virtual Function (rev 01) 10:11.3 Ethernet controller: Intel Corporation 82576 Virtual Function (rev 01) 10:11.5 Ethernet controller: Intel Corporation 82576 Virtual Function (rev 01) I configured the interface as bellow in XML: <interface type="hostdev" managed="yes"> <mac address="fa:16:3e:f7:57:5f"/> <source> <address type="pci" domain="0x0000" bus="0x10" slot="0x10" function="0x3"/> </source> <vlan> <tag id="1000"/> </vlan> </interface> But the error output when I boot one vm: [root@host3 VTS2.1-demo]# virsh create vtc.demo.xml error: Failed to create domain from vtc.demo.xml error: internal error: early end of file from monitor: possible problem: 2016-02-22T07:38:42.169035Z qemu-kvm: -device vfio-pci,host=10:10.3,id=hostdev0,bus=pci.0,addr=0x3: vfio: error, group 17 is not viable, please ensure all devices within the iommu_group are bound to their vfio bus driver. 2016-02-22T07:38:42.169215Z qemu-kvm: -device vfio-pci,host=10:10.3,id=hostdev0,bus=pci.0,addr=0x3: vfio: failed to get group 17 2016-02-22T07:38:42.169233Z qemu-kvm: -device vfio-pci,host=10:10.3,id=hostdev0,bus=pci.0,addr=0x3: Device initialization failed. 2016-02-22T07:38:42.169248Z qemu-kvm: -device vfio-pci,host=10:10.3,id=hostdev0,bus=pci.0,addr=0x3: Device 'vfio-pci' could not be initialized Could you please help to solve it? Looking forward for your reply. Thanks.