Re: [libvirt] About the vfio error when using SR-IOV

On 02/22/2016 04:29 AM, Xiao Ma (xima2) wrote: > 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. One possible meaning is that vfio sees multiple devices in the same iommu group as the VF at 10:10.3 (in case there is some other possible cause, I'm Cc'ing Alex Williamson, the vfio author). You can check this by looking at the output of "virsh nodedev-dumpxml pci_0000_10_10_3" and look at the "iommuGroup" section - if there are multiple addresses listed there, then there are multiple devices in the same iommu group. It could be that your particular chipset needs a "quirk" in the kernel to be told that the VFs really can be in separate iommu groups; without that quirk, all 14 VFs show up in the same iommu group, so the only way to assign one to a guest is to assign *all* of them to the same guest (or at least detach all of them from the VF driver and attach to vfio-pci, then only assign one of them to a guest while the others sit unused). Since you're still running a 7.1 kernel, you may want to try updating to the latest available and see if that solves your problem. If you have further questions, please include the output of "virsh nodedev-dumpxxml pci_0000_10_10_3" and full lspci output (among other things, that should tell us which chipset your machine uses).