Hi everybody, since long time, I'm using Xen on CentOS with XL, currently latest CentOS 7 with Xen 4.15 from the CentOS-Xen-Project. For several VMs I have to use SR-IOV, to lower the CPU-usage on Dom0 on the host. CentOS 7 comes to an end, Xen is not supported by RHEL nor RockyLinux anymore, so unfortunately I have to switch to KVM. First step will be now, converting all the scripts for managing and running VMs, that they run with the additional libvirt-layer. Mostly everything is working, but I do not get a network interface in the VM, when I start it with "virsh start ..." instead of "xl create ...". First of all, is there documentation how to configure the VMs in the dom-definition for XEN (all docs I found are KVM-related)? The converted xl-config does not do the job: virsh -c xen:/// domxml-from-native --format xen-xl vm > vm.xml These are some none working examples I tried out: ... <interface type='hostdev' managed='yes'> <mac address='02:16:32:10:20:30'/> <driver name='xen'/> <source> <address type='pci' domain='0x0000' bus='0x81' slot='0x02' function='0x6'/> </source> <vlan> <tag id='11'/> </vlan> </interface> ... ... <hostdev mode='subsystem' type='pci' managed='yes'> <driver name='xen'/> <source> <address domain='0x0000' bus='0x81' slot='0x02' function='0x6'/> </source> <address type='pci' domain='0x0000' bus='0x81' slot='0x02' function='0x6'/> </hostdev> ... Result is always the same, the VM does not find any interface to configure, when starting as libvirt: # dmesg | egrep -i "net|eth" ... [ 4.523173] iavf: Intel(R) Ethernet Adaptive Virtual Function Network Driver - version 4.4.2.1 # lspci | egrep -i "net|eth" 00:00.6 Ethernet controller: Intel Corporation Ethernet Virtual Function 700 Series (rev 02) # lspci -vmmks 00:00.6 Slot: 00:00.6 Class: Ethernet controller Vendor: Intel Corporation Device: Ethernet Virtual Function 700 Series SVendor: Intel Corporation SDevice: Device 0000 Rev: 02 Module: i40evf Module: iavf NUMANode: 0 # lsmod | egrep -i "iavf|i40" iavf 135168 0 auxiliary 16384 1 iavf ptp 20480 1 iavf # ifconfig eth0 eth0: error fetching interface information: Device not found The same VM after starting with XL: # dmesg | egrep -i "net|eth" ... [ 4.742038] iavf: Intel(R) Ethernet Adaptive Virtual Function Network Driver - version 4.4.2.1 [ 40.578461] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready [ 40.642868] iavf 0000:00:00.6 eth0: NIC Link is Up Speed is 10 Gbps Full Duplex [ 40.644015] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready # lspci | egrep -i "net|eth" 00:00.6 Ethernet controller: Intel Corporation Ethernet Virtual Function 700 Series (rev 02) # lspci -vmmks 00:00.6 Slot: 00:00.6 Class: Ethernet controller Vendor: Intel Corporation Device: Ethernet Virtual Function 700 Series SVendor: Intel Corporation SDevice: Device 0000 Rev: 02 Driver: iavf Module: i40evf Module: iavf NUMANode: 0 # lsmod | egrep -i "iavf|i40" iavf 135168 0 auxiliary 16384 1 iavf ptp 20480 1 iavf # ifconfig eth0 eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 10.20.30.40 netmask 255.255.255.0 broadcast 10.20.30.1 ... ether 02:16:32:10:20:30 txqueuelen 1000 (Ethernet) I expect, that all the SR-IOV stuff is configured correctly, because the VMs runs in XL-mode without any problems. Thanks a lot for any ideas, -- kind regards, Thorolf