October 2019 - 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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[libvirt-users] Live migrate + change interface name
by Marc Roos 07 Oct '20

07 Oct '20

Is it possible to do a live migrate of a guest, having on the from host a source_device=eth2 and to host a source_dev=eth1?

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[libvirt-users] Add Virtlyst to the list of libvirt users
by Daniel Nicoletti 23 Sep '20

23 Sep '20

Hi, I've just released v1.0.0 of Virtlyst[1] a web tool to manage VMs using Qt/C++/Cutelyst https://dantti.wordpress.com/2018/04/19/announcing-virtlyst-a-web-interface… Thanks. 1 - https://github.com/cutelyst/Virtlyst -- Daniel Nicoletti KDE Developer - http://dantti.wordpress.com

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[libvirt-users] Question about disabling UFO on guest
by Bao Nguyen 05 Aug '20

05 Aug '20

Hello everyone, I would like to ask a question regarding to disable UFO of virtio vNIC in my guest. I have read the document at https://libvirt.org/formatdomain.html *host* The csum, gso, tso4, tso6, ecn and ufo attributes with possible values on and off can be used to turn off host offloading options. By default, the supported offloads are enabled by QEMU. *Since 1.2.9 (QEMU only)* The mrg_rxbuf attribute can be used to control mergeable rx buffers on the host side. Possible values are on (default) and off. *Since 1.2.13 (QEMU only)* *guest* The csum, tso4, tso6, ecn and ufo attributes with possible values on and off can be used to turn off guest offloading options. By default, the supported offloads are enabl ed by QEMU. *Since 1.2.9 (QEMU only)* Then I disabled UFO on my vNIC on guest as the following configuration <devices> <interface type='network'> <source network='default'/> <target dev='vnet1'/> <model type='virtio'/> <driver name='vhost' txmode='iothread' ioeventfd='on' event_idx='off' queues='5' rx_queue_size='256' tx_queue_size='256'> *<host gso='off' ufo='off' />* *<guest ufo='off'/>* </driver> </interface> </devices> Then I reboot my node to get the change effect and it works. However, can I disable the UFO without touching the host OS? or it always has to disable on both host and guest like that? Thanks, Brs, Natsu

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[libvirt-users] Add support for vhost-user-scsi-pci/vhost-user-blk-pci
by Li Feng 22 Dec '19

22 Dec '19

Hi Guys, And I want to add the vhost-user-scsi-pci/vhost-user-blk-pci support for libvirt. The usage in qemu like this: Vhost-SCSI -chardev socket,id=char0,path=/var/tmp/vhost.0 -device vhost-user-scsi-pci,id=scsi0,chardev=char0 Vhost-BLK -chardev socket,id=char1,path=/var/tmp/vhost.1 -device vhost-user-blk-pci,id=blk0,chardev=char1 What type should I add for libvirt. Type1: <hostdev mode='subsystem' type='vhost-user'> <source protocol='vhost-user-scsi' path='/tmp/vhost-scsi.sock'></source> <alias name="vhost-user-scsi-disk1"/> </hostdev> Type2: <disk type='network' device='disk'> <driver name='qemu' type='raw' cache='none' io='native'/> <source protocol='vhost-user' path='/tmp/vhost-scsi.sock'> </source> <target dev='sdb' bus='vhost-user-scsi'/> <boot order='3'/> <alias name='scsi0-0-0-1'/> <address type='drive' controller='0' bus='0' target='0' unit='1'/> </disk> <disk type='network' device='disk'> <driver name='qemu' type='raw' cache='none' io='native'/> <source protocol='vhost-user' path='/tmp/vhost-blk.sock'> </source> <target dev='vda' bus='vhost-user-blk'/> <boot order='1'/> <alias name='virtio-disk0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/> </disk> Could anyone give some suggestions? Thanks, Feng Li -- The SmartX email address is only for business purpose. Any sent message that is not related to the business is not authorized or permitted by SmartX. 本邮箱为北京志凌海纳科技有限公司（SmartX）工作邮箱. 如本邮箱发出的邮件与工作无关,该邮件未得到本公司任何的明示或默示的授权.

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[libvirt-users] libvirt_lxc memory limit, emulator process part of the cgroup?
by Maximilian Philipps 14 Nov '19

14 Nov '19

hi, I am currently investigating a bug with libvirt lxc. Whenever I do a systemctl daemon-reload on the host, my container loses his memory limit and then reports having access to 8 exabyte of memory. I have tracked the issue down to two parts: memory.limit_in_bytes jumps from the correct value to 9223372036854771712. libvirt lxc appears to set the memory limit in transient way without writing a config for systemd. I can't prevent memory.limit_in_bytes changing by setting the correct value through systemctl set-property --runtime <scope> MemoryLimit= tasks in the memory cgroup gets cleaned up. After starting the container the cgroup contains 3 pid. The pid of the libvirt_lxc process, the pid of the init process in the container and third unknown pid that doesn't exists in /proc/. After a demon-reload only the init process remains in the cgroup and unless I move the libvirt_lxc process into the cgroup the memory limit isn't enforced. I have also noticed that when starting libvirtd it complains about GetMachineByPID failing for the libvirt_lxc process. This leaves me with one big question, the the emulator process libvirt_lxc supposed to be part of the container's cgroup or not? The leader of the container is the init process in the container. I am unsure on how the additional emulator process is supposed to be registered. Using: Debian Stretch, libvirt 5.0.0-4, systemd 241-7~deb10u1 and hybrid cgroups. Regards, Maximilian Philipps

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[libvirt-users] 32 bit support
by Phill. Whiteside 04 Nov '19

04 Nov '19

Hi good people, I've got a bit of a weird issue. I'm using QEMU emulator version 2.11.1(Debian 1:2.11+dfsg-1ubuntu7.19) And after some considerable time of not using it for 32bit installations I now find that it can no longer install some older 32 bit installations (e.g. https://phillw.net/isos/lubuntu/natty/ ) The CPU goes to 100% and then after a while it just stops (I'm using virt-manager v1.5.1) I'm running lubuntu 18.04 (64 bit) on an i7 chipset that runs 64 bit debian / centos and MS server 2019 KVM instances via virt-manager without problems. Any pointers would be appreciated, Phill.

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[libvirt-users] Memory ballooning
by Mauricio Tavares 31 Oct '19

31 Oct '19

So I as I was searching for the difference between memory and currentMemory, I bumped into http://www.espenbraastad.no/posts/memory-ballooning/ Is the problem this ancient post mention still an issue?

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[libvirt-users] win10 vm stuck in automatic repair
by Jack Kamm 27 Oct '19

27 Oct '19

Hello, I have a Windows 10 guest, when I boot it, it goes in to Automatic Repair mode, and after some time reports it was unable to repair the PC. This is from an older snapshot ("snapshot1"), and if I try switching back to a more recent snapshot ("snapshot2"), libvirt reports that it can't find the snapshot: > libvirt.libvirtError: internal error: Child process (/usr/bin/qemu-img > snapshot -a snapshot2 /var/lib/libvirt/images/win10.qcow2) unexpected > exit status 1: qemu-img: Could not apply snapshot 'snapshot2': Failed > to load snapshot: Invalid argument Does anyone have any ideas why this might have happened, or any suggestions for how I can go about diagnosing/fixing this? This was a pretty simple Windows 10 VM, that I used for Microsoft Office. Everything was managed through virt-manager and most settings left at the original defaults. Thanks, Jack

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[libvirt-users] Reg: Adding "edu" device using XML file
by bharath paulraj 24 Oct '19

24 Oct '19

Hi Team, I am exploring "edu" device in QEMU to add my own custom device. I am able to add the device using the command line. Would it be possible to add the device using XML file through libvirt? -- Regards, Bharath

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