November 2021 - Users - libvirt List Archives

[libvirt-users] [virtual interface] detach interface during boot succeed with no changes
by Yalan Zhang 08 Sep '22

08 Sep '22

Hi guys, when I detach an interface from vm during boot (vm boot not finished), it always fail. I'm not sure if there is an existing bug. I have confirmed with someone that for disk, there is similar behavior, if this is also acceptable? # virsh destroy rhel7.2; virsh start rhel7.2 ;sleep 2; virsh detach-interface rhel7.2 network 52:54:00:98:c4:a0; sleep 2; virsh dumpxml rhel7.2 |grep /interface -B9 Domain rhel7.2 destroyed Domain rhel7.2 started Interface detached successfully <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/> </controller> <interface type='network'> <mac address='52:54:00:98:c4:a0'/> <source network='default' bridge='virbr0'/> <target dev='vnet0'/> <model type='rtl8139'/> <alias name='net0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface> When I detach after the vm boot, expand the sleep time to 10, it will succeed. # virsh destroy rhel7.2; virsh start rhel7.2 ;sleep 10; virsh detach-interface rhel7.2 network 52:54:00:98:c4:a0; sleep 2; virsh dumpxml rhel7.2 |grep /interface -B9 Domain rhel7.2 destroyed Domain rhel7.2 started Interface detached successfully ------- Best Regards, Yalan Zhang IRC: yalzhang Internal phone: 8389413

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[FOSDEM][CFP] Virtualization & IaaS Devroom
by Piotr Kliczewski 15 Dec '21

15 Dec '21

We are excited to announce that the call for proposals is now open for the Virtualization & IaaS devroom at the upcoming FOSDEM 2022, to be hosted virtually on February 5th 2022. This year will mark FOSDEM’s 22nd anniversary as one of the longest-running free and open source software developer events, attracting thousands of developers and users from all over the world. Due to Covid-19, FOSDEM will be held virtually this year on February 5th & 6th, 2022. About the Devroom The Virtualization & IaaS devroom will feature session topics such as open source hypervisors and virtual machine managers such as Xen Project, KVM, bhyve, and VirtualBox, and Infrastructure-as-a-Service projects such as KubeVirt, Apache CloudStack, Foreman, OpenStack, oVirt, QEMU and OpenNebula. This devroom will host presentations that focus on topics of shared interest, such as KVM; libvirt; shared storage; virtualized networking; cloud security; clustering and high availability; interfacing with multiple hypervisors; hyperconverged deployments; and scaling across hundreds or thousands of servers. Presentations in this devroom will be aimed at users or developers working on these platforms who are looking to collaborate and improve shared infrastructure or solve common problems. We seek topics that encourage dialog between projects and continued work post-FOSDEM. Important Dates Submission deadline: 20th of December Acceptance notifications: 25th of December Final schedule announcement: 31st of December Recorded presentations upload deadline: 15th of January Devroom: 6th February 2022 Submit Your Proposal All submissions must be made via the Pentabarf event planning site[1]. If you have not used Pentabarf before, you will need to create an account. If you submitted proposals for FOSDEM in previous years, you can use your existing account. After creating the account, select Create Event to start the submission process. Make sure to select Virtualization and IaaS devroom from the Track list. Please fill out all the required fields, and provide a meaningful abstract and description of your proposed session. Submission Guidelines We expect more proposals than we can possibly accept, so it is vitally important that you submit your proposal on or before the deadline. Late submissions are unlikely to be considered. All presentation slots are 30 minutes, with 20 minutes planned for presentations, and 10 minutes for Q&A. All presentations will need to be pre-recorded and put into our system at least a couple of weeks before the event. The presentations should be uploaded by 15th of January and made available under Creative Commons licenses. In the Submission notes field, please indicate that you agree that your presentation will be licensed under the CC-By-SA-4.0 or CC-By-4.0 license and that you agree to have your presentation recorded. For example: "If my presentation is accepted for FOSDEM, I hereby agree to license all recordings, slides, and other associated materials under the Creative Commons Attribution Share-Alike 4.0 International License. Sincerely, <NAME>." In the Submission notes field, please also confirm that if your talk is accepted, you will be able to attend the virtual FOSDEM event for the Q&A. We will not consider proposals from prospective speakers who are unsure whether they will be able to attend the FOSDEM virtual event. If you are experiencing problems with Pentabarf, the proposal submission interface, or have other questions, you can email our devroom mailing list[2] and we will try to help you. Code of Conduct Following the release of the updated code of conduct for FOSDEM, we'd like to remind all speakers and attendees that all of the presentations and discussions in our devroom are held under the guidelines set in the CoC and we expect attendees, speakers, and volunteers to follow the CoC at all times. If you submit a proposal and it is accepted, you will be required to confirm that you accept the FOSDEM CoC. If you have any questions about the CoC or wish to have one of the devroom organizers review your presentation slides or any other content for CoC compliance, please email us and we will do our best to assist you. Call for Volunteers We are also looking for volunteers to help run the devroom. We need assistance with helping speakers to record the presentation as well as helping with streaming and chat moderation for the devroom. Please contact devroom mailing list [2] for more information. Questions? If you have any questions about this devroom, please send your questions to our devroom mailing list. You can also subscribe to the list to receive updates about important dates, session announcements, and to connect with other attendees. See you all at FOSDEM! [1] https://penta.fosdem.org/submission/FOSDEM22 [2] iaas-virt-devroom at lists.fosdem.org

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a test email (& dmarc) @admins
by lejeczek 10 Dec '21

10 Dec '21

hi guys. I sent email a while ago and I wonder, also having not received a single reply, because I did not get that own email - is there are problem I'm having here or DMARC(yahoo & others?) are not fixed in by this mailing list - would an admin(anybody) know? many thanks, L.

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Libvirt Snapshot Question
by Elias Mobery 02 Dec '21

02 Dec '21

Hi everybody! I'm using a snapshot purely for writes and was wondering if it's possible to clear/empty the snapshot after it reaches a certain size? Created with: virsh snapshot-create-as --disk-only I tried deleting and recreating it but get an error at deletion: virsh snapshot-delete Error: source for disk 'vda' is not a regular file I also tried virsh snapshot-create-as --no-metadata --disk-only But the same error as above pops up when trying to delete. Any ideas?

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migrate libvirt config between machines
by daggs 30 Nov '21

30 Nov '21

Greetings, I'd like to migrate my current libvirt config from one machine to another, what is the best way to do so? Thanks

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qemu-img create with preallocation=full and compression_type=zlib
by Richard Taubo 30 Nov '21

30 Nov '21

Hi! When running this command on Fedora 35 I get: [#] qemu-img create -o preallocation=full -f qcow2 /var/vm_mail/mytest.qcow2 10GB => Formatting '/var/vm_mail//mytest.qcow2', fmt=qcow2 . . . preallocation=full compression_type=zlib . . . ." Question: When using 'preallocation=full’ I was surprised that the resulting qcow2 image includes the 'compression_type=zlib’ part. Why/when is this compression used when the qcow2 image is fully preallocated? Thanks for input on this! :-) Best regards Richard Taubo

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virsh create fails with "Unable to find any firmware to satisfy 'efi'" for aarch64 guest on macOS
by Nathan Vander Wilt 30 Nov '21

30 Nov '21

I am having trouble when I `virsh create test.xml` with an aarch64 guest on a macOS (Apple Silicon) host. I've wrestled with a variety of issues but the one I simply haven't been able to get past is this regarding the UEFI firmware: error: Failed to create domain from test.xml error: operation failed: Unable to find any firmware to satisfy 'efi' This is with `virsh --version` of 7.9.0 and `qemu-system-aarch64 --version` of 6.1.0, both installed via the common `brew` tool from its main 'homebrew/core' tap. I have confirmed that the loader/nvram files referenced do exist. Running `qemu-system-aarch64 -L help` outputs two lines: /opt/homebrew/Cellar/qemu/6.1.0_1/bin/../share/qemu-firmware /opt/homebrew/Cellar/qemu/6.1.0_1/bin/../share/qemu The …/share/qemu-firmware folder does NOT exist, but symlinking it to a …/share/qemu/firmware folder which does exist does not improve the situation. I have also tried renaming the …/share/qemu/firmware folder (e.g. `mv firmware zzz-firmware`) as some notes I found led me to believe that libvirst might ignore my loader/nvram settings entirely if QEMU had the "new" firmware JSON configuration stuff there? But again no improvement…. How can I debug this further? What should I try next? thanks, -natevw --- the test.xml domain configuration I am trying --- <domain type="qemu" xmlns:qemu="http://libvirt.org/schemas/domain/qemu/1.0"> <name>test1</name> <uuid>D45FCA3E-B873-4608-A0B8-3D8529E7CFB7</uuid> <memory unit="MiB">2048</memory> <cpu mode="host-model" check="partial" /> <vcpu>2</vcpu> <clock offset="utc"/> <qemu:commandline> <qemu:arg value='-accel'/> <qemu:arg value='hvf'/> </qemu:commandline> <os firmware="efi"> <type arch="aarch64" machine="virt">hvm</type> <loader readonly="yes" secure="no" type="pflash">/opt/homebrew/share/qemu/edk2-aarch64-code.fd</loader> <nvram template="/opt/homebrew/share/qemu/edk2-arm-vars.fd">/Users/me/vm_testing/vm-test1.efi.fd</nvram> <bootmenu enable="no"/> <boot dev="hd"/> </os> <features> <acpi/> <gic version="3"/> <pae/> </features> <devices> <emulator>/opt/homebrew/bin/qemu-system-aarch64</emulator> <disk type="file" device="disk"> <driver name="qemu" type="qcow2"/> <source file="/Users/me/vm_testing/vm-test1.qcow2"/> <target dev="vda" bus="virtio"/> </disk> <interface type="network"> <source network="default"/> <model type="virtio"/> </interface> <console type="pty"> <target type="serial" port="0"/> </console> <rng model="virtio"> <backend model="random">/dev/urandom</backend> </rng> </devices> </domain>

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Fwd: Installing virtiofs drivers on Windows 11....
by Mario Marietto 30 Nov '21

30 Nov '21

Hello to everyone. I'm testing Windows 11 with bhyve and I've found an annoying problem that prevents me from completing some tasks that I'm working on. It seems that the virtio-9p driver does not work inside the Windows 11 os emulated with bhyve and maybe also with qemu-kvm. When Windows 11 is launched,I don't see the folder "mnt" mounted on the root folder of Windows 11. Below you can see which bhyve parameters I've used : bhyve -S -c 4 -m 8G -w -H \ -s 0,hostbridge \ -s 1,ahci-cd,/home/marietto/Downloads/virtio/virtio-win-0.1.208.iso \ -s 2,ahci-hd,/mnt/da0p1/Backups/OS/bhyve/Windows/win11.img \ -s 3,fbuf,tcp=0.0.0.0:5900,w=1440,h=900,wait \ -s 8,virtio-net,tap0 \ ----> -s 9,virtio-9p,sharename=/mnt \ -s 30,xhci,tablet \ -s 31,lpc \ -l bootrom,/usr/local/share/uefi-firmware/BHYVE_UEFI.fd \ vm0 Investigating a little bit more and reading from this tutorial : https://virtio-fs.gitlab.io/howto-windows.html I've realized that there should be some problem with the WinFsp <http://www.secfs.net/winfsp> - Windows File System Proxy and or with the virtiofs PCI device driver because I'm not able to enable the virtiofs service with the command used on the tutorial : C:\> sc start VirtioFsSvc it gives the error : "the dependency service does not exist or it has been marked for the elimination. I've attached some screenshots to help you to understand what's happening. Please help me,thanks. Attached screenshots : https://ibb.co/m5vm1hd https://ibb.co/Qd6TS5d https://ibb.co/3018SGd -- Mario.

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virsh blockjob $domain --abort
by Jeff Brown 30 Nov '21

30 Nov '21

Please advise: After a scheduled crontab snapshot backup of a VM it failed to do a blockcommit, and is currently writing to both the snapshot and the original QCOW2 images. (I don't think it's a bug, and suspect that I caused it by running the backup script manually while the snapshot was already running.) $ virsh blockcommit VM sda --active --pivot --shallow --verbose error: block copy still active: disk 'sda' already in active block job $ virsh blockjob VM sda --info Active Block Commit: [100 %] $ virsh domblkerror VM No errors found Running on Debian 9 (Stretch). $ virsh version Compiled against library: libvirt 3.0.0 Using library: libvirt 3.0.0 Using API: QEMU 3.0.0 Running hypervisor: QEMU 2.8.1 Now, I've read up on the probable solution, somewhat, but running $ virsh blockjob $domain --abort on this production server scares me; and I'm just asking whether it would be advisable to stop services and make a full data backup prior to doing so? It would entail taking the services offline for at least an hour. The snapshot is currently at 12GB, and according to blockjob --info the VM image is 100% in synch. Will appreciate any advice. Thank you. Best regards, Jeff

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Libvirt + Debian Live = Heart Attack
by Elias Mobery 25 Nov '21

25 Nov '21

Hi everyone! I've built a Debian Live ISO with packages qemu and libvirt to run a VM in the live environment. The guest images are placed in /var/lib/libvirt/images and 2GB each. Everything works great, except for one issue. When starting a VM, libvirt automatically issues a chown command to the images, changing ownership. This results in a copy of the images being created in /run/live/overlay/rw/var/lib/libvirt/images I don't want these copies to be made but can't stop it. I've tried editing qemu.conf user/group, dynamic ownership etc. without any luck. Is there a way to STOP libvirt from changing the ownership of these images?

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Questions on device-added and device-removed events
by Han Han 23 Nov '21

23 Nov '21

Hi developers, When the guest OS is booting, the event for live attachment could be caught by libvirt, while the event for live detachment could not. Version: libvirt-7.9 qemu-kvm-6.1 Steps: Terminal 1: ➜ ~ virsh event --loop --all Terminal 2: ➜ ~ virsh start avocado-vt-vm1; qemu-img create /tmp/vdb 10M; virsh attach-disk avocado-vt-vm1 /tmp/vdb vdb; virsh detach-disk avocado-vt-vm1 vdb The outputs from terminal 1: event 'agent-lifecycle' for domain 'avocado-vt-vm1': state: 'disconnected' reason: 'domain started' event 'lifecycle' for domain 'avocado-vt-vm1': Resumed Unpaused event 'lifecycle' for domain 'avocado-vt-vm1': Started Booted event 'device-added' for domain 'avocado-vt-vm1': virtio-disk1 event 'agent-lifecycle' for domain 'avocado-vt-vm1': state: 'connected' reason: 'channel event' As you can see, the device live attachment and the device detachment are both executed when the guest OS is booting, but there is only the event 'device-added' is recorded. So my questions are: 1. Is it the expected results for the results above? 2. If so, what is the internal difference between 'device-added' and 'device-removed'? 3. I notice there is the DEVICE_DELETED event in qmp? Any relation between the 'device-removed' of libvirt and the DEVICE_DELETED of qmp?

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how to use vhost-user-vsock
by Jiatong Shen 23 Nov '21

23 Nov '21

Hello community, I am looking for a way to configure vhost-user-vsock using libvirt, but looks like it is not written in doc. How can I use vhost-user-vsock using libvirt? Thank you. -- Best Regards, Jiatong Shen

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configure path name of ebtables executable
by Michael Ströder 17 Nov '21

17 Nov '21

HI! Is it possible to configure the full path name of the ebtables executable used somewhere in libvirt's config? Background: I'd like to avoid automatic alternatives implementation to mess up libvirt installation. See also: https://bugzilla.opensuse.org/show_bug.cgi?id=1192799 Ciao, Michael.

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Cannot access KVM using virsh console after KVM rebooted or shut off
by Yifei Liu 16 Nov '21

16 Nov '21

Dear all, I used ssh with -X option to connect to an Ubuntu remote server where I applied virsh (libvirt) to manage my KVM virtual machines, and my local machine is MacOS. Then, I used virt-install to install a Tiny Core Linux VM, and I got a pop-up Virt Viewer window (via XQuartz) which is the console for my Tiny Core VM. However, if I rebooted my VM, then I checked the VM state by virsh list --all which was running. Then, I tried `virsh console my_vm_domain` but this command got stuck on: > Connected to domain my_vm_domain > Escape character is ^] The `virsh console` command hung without any response. This issue also happened when I used virsh console after I shut down and later started the VM. Even the VM was already started, I cannot return to the VM console by `virsh console`. I can get the VM console in Virt Viewer at the first boot (using virt-install). But, if I shutdown the VM once, I can never access the VM console by virsh console even the VM state is running. Any idea about how to use virsh console? Thanks, Yifei

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can't connect to virtlogd: Unable to open system token /run/libvirt/common/system.token: Permission denied
by 梁朝军 16 Nov '21

16 Nov '21

Hi all, I have encountered a new issue when start a VM with new builded libvirt. I failed to start VM from defined xml and hit the error like "can't connect to virtlogd: Unable to open system token /run/libvirt/common/system.token: Permission denied” Any inputs are appreciated. The libvit version: libvirtd -V setlocale: No such file or directory libvirtd (libvirt) 7.6.0 Os : cat /etc/redhat-release Red Hat Enterprise Linux release 8.4 (Ootpa) Linux kernel: uname -a Linux localhost.localdomain 4.18.0-305.el8.x86_64 #1 SMP Thu Apr 29 08:54:30 EDT 2021 x86_64 x86_64 x86_64 GNU/Linux QEMU version: usr/libexec/qemu-kvm --help QEMU emulator version 5.1.0 (qemu-kvm-5.1.0-1.el8) Copyright (c) 2003-2020 Fabrice Bellard and the QEMU Project developers Thanks!

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CPU vendor_id handling
by Toolybird 15 Nov '21

15 Nov '21

Hello, There are times when spoofing the CPU vendor_id is convenient. For example, some x86 guest OS's only run on Intel and refuse to run on an AMD host. Libvirt does support this in the "host-model" case, but it doesn't work for CPU "host-passthrough". On the QEMU command line it's as easy as: $ qemu-system-x86_64 -cpu host,vendor=GenuineIntel This works fine in libvirt XML: <cpu mode='host-model'> <model vendor_id='GenuineIntel'/> </cpu> This doesn't: <cpu mode='host-passthrough'> <model vendor_id='GenuineIntel'/> </cpu> Libvirt silently strips out the model line after saving "virsh edit ..." Is there any reason why libvirt cannot support this in the host-passthrough case? The status quo means that some folks end up resorting to <qemu:arg value='-cpu'/> hacks which of course causes all sorts of confusion with multiple -cpu lines getting passed to QEMU. Thanks

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creating specific cpu model
by daggs 13 Nov '21

13 Nov '21

Greetings, I want to create a new cpu model which is a cross section of cpu flags of 2 different cpus and libvirt capabilites. I've extracted the supported cpu flags of each cpu using lscpu. I've created a cross section of both. I've pulled the suppored cpu flags from libvirt and created a cross section of it with the subset from above. now I want to create a new cpu model out of it. I assume that creating a xml file at /usr/share/libvirt/cpu_map/ with the x86_ prefix that matches the format listed there will suffice for libvirt and later for qemu? Thanks, Dagg.

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