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virsh qemu-monitor-command block_resize not working
by arjen-libvirt＠gugu.be 14 Jul '21

14 Jul '21

Hi List, some version info: ]# /usr/libexec/qemu-kvm -version QEMU emulator version 4.2.0 (qemu-kvm-4.2.0-48.module+el8.4.0+534+4680a14e) Copyright (c) 2003-2019 Fabrice Bellard and the QEMU Project developers ]# virsh version Compiled against library: libvirt 6.0.0 Using library: libvirt 6.0.0 Using API: QEMU 6.0.0 Running hypervisor: QEMU 4.2.0 information about block devices for one specific guest: ]# virsh qemu-monitor-command uat-win201202.uat.gugu.be --hmp info block libvirt-2-format: /data/kvm/storage/diskimages01/uat-win201202_disk1_C.qcow2 (qcow2) Attached to: /machine/peripheral/virtio-disk0/virtio-backend Cache mode: writeback ide0-0-0: [not inserted] Attached to: ide0-0-0 Removable device: not locked, tray closed But then, when I want to resize the block device, I just cannot seem to find the correct device. I tried all of these: virsh qemu-monitor-command uat-win201202.uat.gugu.be --hmp block_resize libvirt-2-storage 48G Error: Cannot find device=libvirt-2-storage nor node_name= virsh qemu-monitor-command uat-win201202.uat.gugu.be --hmp block_resize drive-libvirt-2-storage 48G Error: Cannot find device=drive-libvirt-2-storage nor node_name= virsh qemu-monitor-command uat-win201202.uat.gugu.be --hmp block_resize virtio-disk0 48G Error: Cannot find device=virtio-disk0 nor node_name= virsh qemu-monitor-command uat-win201202.uat.gugu.be --hmp block_resize drive-virtio-disk0 48G Error: Cannot find device=drive-virtio-disk0 nor node_name= In a previous qemu version this worked (EL 7). Can someone help me out? Best regards, Arjen Van Drie, Antwerp

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host identifier
by Jiatong Shen 05 Jul '21

05 Jul '21

Hello community, I am using OpenStack nova and realize that nova now uses host fqdn from libvirt as a uniq identifier for a compute node. The issue is that host might need to change its fqdn under some rare circumstances and lose some usage data due to the nova manages compute node resources. My question is: does libvirt already export host uuid identifier to other applications? I skim through the code base and find there is host uuid related code which reads /etc/machine-id to obtain a uniq uuid for migration, but seems this uuid cannot be obtained through virsh interface. Thank you for you help. -- Best Regards, Jiatong Shen

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Fail to do blockcopy to network dest xml with --reuse-external
by Han Han 28 Jun '21

28 Jun '21

Hello, libvirt developers, Recently I find an issue of libvirt blockcopy: Versions: libvirt-7.4.0 qemu-kvm-6.0.0 Steps: 1. Create a nbd server # qemu-img create -f qcow2 /var/lib/libvirt/images/fedora-1.qcow2 10G -o preallocation=full # qemu-nbd -e 10 /var/lib/libvirt/images/fedora-1.qcow2 -p 10001 2. Prepare a running VM # virsh list Id Name State ------------------------ 3 fedora running # virsh dumpxml 3|xmllint --xpath //disk - <disk type="file" device="disk"> <driver name="qemu" type="qcow2"/> <source file="/var/lib/libvirt/images/fedora.qcow2" index="1"/> <backingStore/> <target dev="hda" bus="ide"/> <alias name="ide0-0-0"/> <address type="drive" controller="0" bus="0" target="0" unit="0"/> </disk> 3. Blockcopy to a nbd dest xml with --reuse-external # cat /tmp/copy.xml <disk type='network' device='disk'> <driver name='qemu' type='qcow2'/> <source protocol="nbd"> <host name="localhost" port="10001" /> </source> <backingStore/> <target dev='hda' bus='ide'/> </disk> # virsh blockcopy fedora hda --xml /tmp/copy.xml --transient-job --wait --verbose --finish --reuse-external error: unsupported configuration: reused mirror destination format must be specified But it works without --reuse-external # virsh blockcopy fedora hda --xml /tmp/copy.xml --transient-job --wait --verbose --finish Block Copy: [100 %] Successfully copied Since it is clear that the format of dest image is qcow2, the error message "reused mirror destination format must be specified" is wrong. The blockcopy with network disk + --reuse-external should either be supported or post a better error message. I am not sure if --reuse-external flag is only for file type disk. It seems the description of VIR_DOMAIN_BLOCK_COPY_REUSE_EXT( https://github.com/libvirt/libvirt/blob/7c08141f906e20e730c4b6407bc638e743d…) indicates this flag is for file only: * VIR_DOMAIN_BLOCK_COPY_REUSE_EXT flag is present stating that the file * was pre-created with the correct format and metadata and sufficient * size to hold the copy. In case the VIR_DOMAIN_BLOCK_COPY_SHALLOW flag * is used the pre-created file has to exhibit the same guest visible contents * as the backing file of the original image. This allows a management app to * pre-create files with relative backing file names, rather than the default * of absolute backing file names. Please help to confirm if it is a bug here.

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issue when not using acpi indices in libvirt 7.4.0 and qemu 6.0.0
by Riccardo Ravaioli 25 Jun '21

25 Jun '21

Hi everyone, We have an issue with how network interfaces are presented in the VM with the latest libvirt 7.4.0 and qemu 6.0.0. Previously, we were on libvirt 7.0.0 and qemu 5.2.0, and we used increasing virtual PCI addresses for any type of network interface (virtio, PCI passthrough, SRIOV) in order to decide the interface order inside the VM. For instance the following snippet yields ens1, ens2 and ens3 in a Debian Buster VM: <interface type="ethernet"> <target dev="0.vSrv"/> <mac address="52:54:00:aa:cc:05"/> <address bus="0x01" domain="0x0000" function="0x0" slot="0x01" type="pci"/> <model type="virtio"/> <driver> <host csum="off"/> </driver> </interface> <interface type="ethernet"> <target dev="1.vSrv"/> <mac address="52:54:00:aa:bb:81"/> <address bus="0x01" domain="0x0000" function="0x0" slot="0x02" type="pci"/> <model type="virtio"/> <driver> <host csum="off"/> </driver> </interface> <hostdev managed="yes" mode="subsystem" type="pci"> <source> <address bus="0x0d" domain="0x0000" function="0x0" slot="0x00"/> </source> <address bus="0x01" domain="0x0000" function="0x0" slot="0x03" type="pci"/> </hostdev> After upgrading to libvirt 7.4.0 and qemu 6.0.0, the XML snippet above yielded: - ens1 for the first virtio interface => OK - rename4 for the second virtio interface => **KO** - ens3 for the PCI passthrough interface => OK Argh! What happened to ens2? By running udev inside the VM, I see that "rename4" is the result of a conflict between the ID_NET_NAME_SLOT of the second and the third interface, both appearing as ID_NET_NAME_SLOT=ens3. In theory rename4 should show ID_NET_NAME_SLOT=ens2. What happened? # udevadm info -q all /sys/class/net/rename4 P: /devices/pci0000:00/0000:00:03.0/0000:01:02.0/virtio4/net/rename4 L: 0 E: DEVPATH=/devices/pci0000:00/0000:00:03.0/0000:01:02.0/virtio4/net/rename4 E: INTERFACE=rename4 E: IFINDEX=4 E: SUBSYSTEM=net E: USEC_INITIALIZED=94191911 E: ID_NET_NAMING_SCHEME=v240 E: ID_NET_NAME_MAC=enx525400aabba1 E: ID_NET_NAME_PATH=enp1s2 E: ID_NET_NAME_SLOT=ens3 E: ID_BUS=pci E: ID_VENDOR_ID=0x1af4 E: ID_MODEL_ID=0x1000 E: ID_PCI_CLASS_FROM_DATABASE=Network controller E: ID_PCI_SUBCLASS_FROM_DATABASE=Ethernet controller E: ID_VENDOR_FROM_DATABASE=Red Hat, Inc. E: ID_MODEL_FROM_DATABASE=Virtio network device E: ID_PATH=pci-0000:01:02.0 E: ID_PATH_TAG=pci-0000_01_02_0 E: ID_NET_DRIVER=virtio_net E: ID_NET_LINK_FILE=/usr/lib/systemd/network/99-default.link E: SYSTEMD_ALIAS=/sys/subsystem/net/devices/rename4 E: TAGS=:systemd: # udevadm info -q all /sys/class/net/ens3 P: /devices/pci0000:00/0000:00:03.0/0000:01:03.0/net/ens3 L: 0 E: DEVPATH=/devices/pci0000:00/0000:00:03.0/0000:01:03.0/net/ens3 E: INTERFACE=ens3 E: IFINDEX=2 E: SUBSYSTEM=net E: USEC_INITIALIZED=3600940 E: ID_NET_NAMING_SCHEME=v240 E: ID_NET_NAME_MAC=enx00900b621235 E: ID_OUI_FROM_DATABASE=LANNER ELECTRONICS, INC. E: ID_NET_NAME_PATH=enp1s3 E: ID_NET_NAME_SLOT=ens3 E: ID_BUS=pci E: ID_VENDOR_ID=0x8086 E: ID_MODEL_ID=0x1533 E: ID_PCI_CLASS_FROM_DATABASE=Network controller E: ID_PCI_SUBCLASS_FROM_DATABASE=Ethernet controller E: ID_VENDOR_FROM_DATABASE=Intel Corporation E: ID_MODEL_FROM_DATABASE=I210 Gigabit Network Connection E: ID_PATH=pci-0000:01:03.0 E: ID_PATH_TAG=pci-0000_01_03_0 E: ID_NET_DRIVER=igb E: ID_NET_LINK_FILE=/usr/lib/systemd/network/99-default.link E: SYSTEMD_ALIAS=/sys/subsystem/net/devices/ens3 E: TAGS=:systemd: Is there anything we can do in the XML definition of the VM to fix this? The PCI tree from within the VM is the following, if it helps: (with libvirt 7.0.0 and qemu 5.2.0 it was the same) # lspci -tv -[0000:00]-+-00.0 Intel Corporation 440FX - 82441FX PMC [Natoma] +-01.0 Intel Corporation 82371SB PIIX3 ISA [Natoma/Triton II] +-01.1 Intel Corporation 82371SB PIIX3 IDE [Natoma/Triton II] +-01.2 Intel Corporation 82371SB PIIX3 USB [Natoma/Triton II] +-01.3 Intel Corporation 82371AB/EB/MB PIIX4 ACPI +-02.0 Cirrus Logic GD 5446 +-03.0-[01]--+-01.0 Red Hat, Inc. Virtio network device | +-02.0 Red Hat, Inc. Virtio network device | \-03.0 Intel Corporation I210 Gigabit Network Connection +-04.0-[02]-- +-05.0-[03]-- +-06.0-[04]-- +-07.0-[05]-- +-08.0-[06]----01.0 Red Hat, Inc. Virtio block device +-09.0 Intel Corporation 82801IR/IO/IH (ICH9R/DO/DH) 6 port SATA Controller [AHCI mode] +-0a.0 Red Hat, Inc. Virtio console +-0b.0 Red Hat, Inc. Virtio memory balloon \-0c.0 Red Hat, Inc. Virtio RNG I see that a new feature in qemu and libvirt is to add ACPI indices in order to have network interfaces appear as *onboard* and sort them through this index as opposed to virtual PCI addresses. This is great. I see that in this case, interfaces appear as eno1, eno2, etc. However, for the sake of backward compatibility, is there a way to have the previous behaviour where interfaces were called by their PCI slot number (ens1, ens2, etc.)? If I move to the new naming yielded by ACPI indices, I am mostly worried about any possible change in interface names that might occur across VMs running different OS's, with respect to what we had before with libvirt 7.0.0 and qemu 5.2.0. Thanks! Best, Riccardo Ravaioli

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Libvirt hit a issue when do VM migration
by 梁朝军 23 Jun '21

23 Jun '21

Hi All, Who can give me a help? I hit another issue when do vm migration? Libvirt throw out the error like below "libvirt: Domain Config error : unsupported configuration: vcpu enable order of vCPU '0' differs between source and destination definitions” The cup information is defined VM domain on source host is like: <vcpu placement='static'>2</vcpu> <vcpus> <vcpu id='0' enabled='yes' hotpluggable='no' order='1'/> <vcpu id='1' enabled='yes' hotpluggable='no' order='2'/> </vcpus> <cputune> <vcpupin vcpu='0' cpuset='42'/> <vcpupin vcpu='1' cpuset='43'/> </cputune> The distinction host previews generate xml for VM like: <vcpu placement='static'>2</vcpu> <vcpus> <vcpu id='0' enabled='yes' hotpluggable='no' order='1'/> <vcpu id='1' enabled='yes' hotpluggable='no' order='2'/> </vcpus> <cputune> <vcpupin vcpu='0' cpuset='42'/> <vcpupin vcpu='1' cpuset='43'/> </cputune> What’t wrong with it? Or I missing some actions in configurations regarding the migration Thanks a lot !

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unaccessible directory in lxcContainerResolveSymlinks
by Priyanka Gupta 23 Jun '21

23 Jun '21

Hi, Could someone pls let me know when this condition could possibly arise? lxcContainerResolveSymlinks:621 : Skipped unaccessible '/flash/dir' The code seems to call access('/flash/dir', F_OK) which shall only check for existence of this directory '/flash/dir'. I have this directory created on my host. Is there anything that I am missing? Thanks Priyanka

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Testing DKIM handling
by dberrange＠yahoo.com 22 Jun '21

22 Jun '21

Testing whether DKIM signatures still get mangled....

1 0

driver_remote option defaults to auto
by Jiatong Shen 21 Jun '21

21 Jun '21

Hello community, I am looking at building and packaging libvirt source code. I am seeing from commit https://github.com/libvirt/libvirt/commit/83ff55b5a2618d32f623d7ca0b6f9c28b… `driver_remote` is defaulting to auto which is different from enabled before. I am curious what does auto mean? does it mean that meson will take over and determine if driver_remote should be enabled or we have to write more logic in meson.build? currently it seems there is no effort to auto determine driver_remote. I think it is interesting because https://github.com/libvirt/libvirt/blob/54b602019d7dfa94a6c52ef7aa3abdfaa93… sasl seems required remote_driver to have a value of enabled... -- Best Regards, Jiatong Shen

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KVM Virtual Machine Network - Guest-guest/VM-VM only network (no host/hypervisor access, no outbound connectivity)
by Eduardo Lúcio Amorim Costa 14 Jun '21

14 Jun '21

I know that with the *virsh* command I can create several types of networks (a "NAT network", for example) as we can see in these URLs... KVM network management <https://programmersought.com/article/52213715009/> KVM default NAT-based networking <https://www.ibm.com/downloads/cas/ZVJGQX8E> (page 33) *QUESTION:* How can I create a network (*lan_n*) where only guests/VMs have connectivity, with no outbound connectivity and no host/hypervisor connectivity? *NOTE:* The connectivity to other resources will be provided by a *pfSense* firewall server that will have access to another network (*wan_n*) with outbound connectivity and other resources. Network layout... [N]wan_n ↕ [I]wan_n [V]pfsense_vm [I]lan_n ↕ [N]lan_n ↕ ............................. ↕ ↕ ↕ [V]some_vm_0 [V]some_vm_1 [V]some_vm_4 [V]some_vm_2 [V]some_vm_5 [V]some_vm_3 _ [N] - Network; _ [I] - Network Interface; _ [V] - Virtual Machine. *Thanks! =D* *ORIGINAL QUESTION: *https://serverfault.com/q/1066478/276753 <https://programmersought.com/article/52213715009/> -- *Eduardo Lúcio* Tecnologia, Desenvolvimento e Software Livre LightBase Consultoria em Software Público eduardo.lucio(a)lightbase.com.br <eduardo.lucio(a)LightBase.com.br> *+55-61-3347-1949* - http://brlight.org <eduardo.lucio(a)LightBase.com.br> - *Brasil-DF* *Software livre! Abrace essa idéia!* *"Aqueles que negam liberdade aos outros não a merecem para si mesmos."* *Abraham Lincoln*

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the SSL cert of libvirt.org is outdated
by 伍翀 14 Jun '21

14 Jun '21

hi, there, the SSL cert of libvirt.org is outdated, could anyone replace it as new one?

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