December 2022 - Users - libvirt List Archives

[libvirt-users] bridge / ubuntu / no arp reply
by François Chenais 15 Oct '26

15 Oct '26

Hello I'm trying to setup a bridged guest on an ubuntu 13.10 but it doesn't work. (Everything is ok with NAT) Network sniffing shows that arp replies don't come back to the guest. Test 1 ------ Guest : ping host_bridge_ip (ok) Test 2 ------ Guest: ping other_lan_host (KO) other_lan_host - receives arp who-is request - sends arp reply - arp -a shows the guest macaddr => Guest doesn't receive reply Test 3 ------ other_lan_host ping the Guest (KO) - arp -a shows "incomplete" addr - Guest receives nothing On Host ------- network tcpdump on bridge or vnet interfaces shows request but no reply ... Thanks in advance for help or ideas François

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Libvirt
by Gk Gk 26 Oct '23

26 Oct '23

Hi All, I am trying to collect memory, disk and network stats for a VM on kvm host. It seems that the statistics are not matching what the OS inside the VM is reporting. Why is this discrepancy ? Is this a known bug of libvirt ? Also I heard that libvirt shows cumulative figures for these measures ever since the VM was created. Also I tested by creating a new vm and comparing the stats without a reboot . Even in this case, the stats dont agree. Can someone help me here please ? Thanks Kumar

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WinServer2016 guest no mouse in VirtManager
by John McInnes 03 Feb '23

03 Feb '23

Hi! I recently converted several Windows Server VMs from HyperV to libvirt/KVM. The host is running openSUSE Leap 15.3. I used virt-v2v and I installed virtio drivers on all of them and it all went well - except for one VM. The mouse does not work for this VM in VirtualMachineManager. There is no cursor and no response. There are no issues showing in Windows Device Manager. The mouse shows up as a PS/2 mouse. Interestingly if I RDP into this VM using Microsoft Remote Desktop the mouse works fine. Any ideas? ---- John McInnes jmcinnes /\T svt.org

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libvirt_connect_get_nic_models
by Simon Fairweather 02 Jan '23

02 Jan '23

Hi Can you confirm that I source get an array of these when running this api call, currently I just get a return of false root@computenode:/mnt/testpool# qemu -nic model=help Supported NIC models: e1000 e1000-82544gc e1000-82545em e1000e i82550 i82551 i82557a i82557b i82557c i82558a i82558b i82559a i82559b i82559c i82559er i82562 i82801 ne2k_pci pcnet rtl8139 tulip virtio-net-pci virtio-net-pci-non-transitional virtio-net-pci-transitional vmxnet3 function domain_get_nic_models($arch = 'x86_64') { $tmp = libvirt_connect_get_nic_models($this->conn, $arch) ; return ($tmp) ? $tmp : $this->_set_last_error(); }

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Snapshots of EFI VMs
by Simon Fairweather 30 Dec '22

30 Dec '22

Is there a timeline to fully support create/remove and revert for these VMs?

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how to add LD_PRELOAD in the xml
by Marc 30 Dec '22

30 Dec '22

How should I add LD_PRELOAD to domain xml. I guess within: <qemu:commandline> <qemu:arg value='env=LD_PRELOAD=/usr/lib64/libtcmalloc.so'/> </qemu:commandline> but this is generating syntax errors.

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Fwd: Need help
by Gk Gk 22 Dec '22

22 Dec '22

FYI.... ---------- Forwarded message --------- From: Gk Gk <ygk.kmr(a)gmail.com> Date: Wed, Dec 21, 2022 at 9:46 PM Subject: Re: Need help To: Daniel P. Berrangé <berrange(a)redhat.com> I have just created a new vm and rechecked the disk stats. This time around too, they seem to be different as shown below: >From libvirt python library: --- disk_name=sda read_req=10501,read_bytes=263819776,write_req=1933,write_bytes=82269184 --- So the write_bytes from above amounted to 78 MB approx. But from within the vm : --- root@sample2:~# iostat -p sda -h Linux 4.15.0-101-generic (sample2) 12/21/2022 _x86_64_ (1 CPU) avg-cpu: %user %nice %system %iowait %steal %idle 1.9% 0.0% 1.3% 0.4% 0.0% 96.4% Device tps kB_read/s kB_wrtn/s kB_read kB_wrtn sda 40.45 643.6k 21.2M 217.5M 7.2G sda1 40.04 637.6k 21.2M 215.5M 7.2G ---- 7.2 G is far from 78 MB. Am I doing wrong anywhere ? Btw, I did not reboot the new vm this time On Wed, Dec 21, 2022 at 9:30 PM Daniel P. Berrangé <berrange(a)redhat.com> wrote: > On Wed, Dec 21, 2022 at 09:26:14PM +0530, Gk Gk wrote: > > Thanks Daniel for the response. > > > > I am wondering what exactly is the difference in the process for a soft > and > > hard reboot in the context of a kvm guest ? Can you throw some light here > > please ? > > KVM will always do a soft reboot, where QEMU keeps running. > > > With regards, > Daniel > -- > |: https://berrange.com -o- > https://www.flickr.com/photos/dberrange :| > |: https://libvirt.org -o- > https://fstop138.berrange.com :| > |: https://entangle-photo.org -o- > https://www.instagram.com/dberrange :| > >

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Fwd: Need help
by Gk Gk 22 Dec '22

22 Dec '22

For larger reach....... ---------- Forwarded message --------- From: Gk Gk <ygk.kmr(a)gmail.com> Date: Thu, Dec 22, 2022 at 8:35 AM Subject: Re: Need help To: Daniel P. Berrangé <berrange(a)redhat.com> Hi Daniel, Did you get a chance to check this out ? Please let me know.... On Wednesday, December 21, 2022, Gk Gk <ygk.kmr(a)gmail.com> wrote: > I have just created a new vm and rechecked the disk stats. This time around too, they seem to be different as shown below: > From libvirt python library: > --- > disk_name=sda read_req=10501,read_bytes=263819776,write_req=1933,write_bytes=82269184 > --- > > So the write_bytes from above amounted to 78 MB approx. > But from within the vm : > --- > root@sample2:~# iostat -p sda -h > Linux 4.15.0-101-generic (sample2) 12/21/2022 _x86_64_ (1 CPU) > > avg-cpu: %user %nice %system %iowait %steal %idle > 1.9% 0.0% 1.3% 0.4% 0.0% 96.4% > > Device tps kB_read/s kB_wrtn/s kB_read kB_wrtn > sda > 40.45 643.6k 21.2M 217.5M 7.2G > sda1 > 40.04 637.6k 21.2M 215.5M 7.2G > ---- > 7.2 G is far from 78 MB. Am I doing wrong anywhere ? Btw, I did not reboot the new vm this time > > > > On Wed, Dec 21, 2022 at 9:30 PM Daniel P. Berrangé <berrange(a)redhat.com> wrote: >> >> On Wed, Dec 21, 2022 at 09:26:14PM +0530, Gk Gk wrote: >> > Thanks Daniel for the response. >> > >> > I am wondering what exactly is the difference in the process for a soft and >> > hard reboot in the context of a kvm guest ? Can you throw some light here >> > please ? >> >> KVM will always do a soft reboot, where QEMU keeps running. >> >> >> With regards, >> Daniel >> -- >> |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| >> |: https://libvirt.org -o- https://fstop138.berrange.com :| >> |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :| >> >

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Need help
by Gk Gk 21 Dec '22

21 Dec '22

Hi All, I am trying to get guest VM's disk statistics using a libvirt python library as follows: --- raw_xml = domain.XMLDesc(0) for disk in doc.getElementsByTagName('disk'): disk_data = disk.getElementsByTagName('target') --- The above code is yielding the following stats for two disks inside the VM: -- disk_name=sda read_req=34137,read_bytes=445358592,write_req=2405970,write_bytes=24943391744 disk_name=sdb read_req=34357,read_bytes=450754048,write_req=2405984,write_bytes=24943465472 --- The write_bytes divided by 1024 yields 24358853 kB. But when I compare the above statistics from the iostat data shown from inside the VM, I see a stark difference between the two results as shown below: --- root@sample:~# iostat Linux 4.15.0-101-generic (sample) 12/21/2022 _x86_64_ (1 CPU) avg-cpu: %user %nice %system %iowait %steal %idle 0.27 0.00 0.03 0.02 0.01 99.68 Device tps kB_read/s kB_wrtn/s kB_read kB_wrtn sda 0.24 0.04 11.87 400052 121844120 sdb 0.00 0.00 1.19 5269 12223752 ---- Why is there a huge difference in the number of bytes read and written for the two disks as reported by libvirt ? Please explain. Thanks Kumar

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[Question] Which qcow2 options could be inherited to snapshot/blockcopy?
by Meina Li 20 Dec '22

20 Dec '22

Hi, I'm trying to find out which qcow2 options could be inherited to snapshot/blockcopy and then test them. >From https://github.com/qemu/qemu/blob/master/qapi/block-core.json#L4720 we can know all the qcow2 options. As far as I know, size, cluster_size and extended-l2 have already been implemented. So I'm curious that: 1) What are the current status and future plans of other options? Like compat option. 2) Also whether the vol-clone can cover all options? Thank you very much. And please help to correct me if I have something wrong. Best Regards, Meina Li

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