WinServer2016 guest no mouse in VirtManager
by John McInnes
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?
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John McInnes
jmcinnes /\T svt.org
1 year, 3 months
Libvirt slow after a couple of months uptime
by André Malm
Hello,
I have some issues with libvirtd getting slow over time.
After a fresh reboot (or systemctl restart libvirtd) virsh list /
virt-install is fast, as expected, but after a couple of months uptime
they both take a significantly longer time.
Virsh list takes around 3 seconds (from 0.04s on a fresh reboot) and
virt-install takes over a minute (from around a second).
Running strace on virsh list it seems to get stuck in a loop on this:
poll([{fd=5<socket:[173169773]>, events=POLLOUT},
{fd=6<anon_inode:[eventfd]>, events=POLLIN}], 2, -1) = 2 ([{fd=5,
revents=POLLOUT}, {fd=6, revents=POLLIN}])
While restarting libvirtd fixes it a restart takes around 1 minute where
ebtables rules etc are recreated and it does interrupt the service. What
could cause this? How would I troubleshoot this?
I'm running Ubuntu 22.04 / libvirt 8.0.0 with 70 active VM’s on a 16/32
core machine with 256GB of ram, CPU is below 50% usage at all times,
memory below 50% usage and swap 0% usage.
Thanks,
André
1 year, 5 months
domain_qemu_agent_command($domain,$cmd,$timeout,$flags)
by Simon Fairweather
Should there be a way to suppress errors using the flags?
error : qemuDomainAgentAvailable:8411 : Guest agent is not responding:
QEMU guest agent is not connected
Or is there a libvirt function to check connection status or another way?
1 year, 6 months
Predictable and consistent net interface naming in guests
by Edward Haas
Hi Igor and Laine,
I would like to revive a 2 years old discussion [1] about consistent network
interfaces in the guest.
That discussion mentioned that a guest PCI address may change in two cases:
- The PCI topology changes.
- The machine type changes.
Usually, the machine type is not expected to change, especially if one
wants to allow migrations between nodes.
I would hope to argue this should not be problematic in practice, because
guest images would be made per a specific machine type.
Regarding the PCI topology, I am not sure I understand what changes
need to occur to the domxml for a defined guest PCI address to change.
The only think that I can think of is a scenario where hotplug/unplug is
used,
but even then I would expect existing devices to preserve their PCI address
and the plug/unplug device to have a reserved address managed by the one
acting on it (the management system).
Could you please help clarify in which scenarios the PCI topology can cause
a mess to the naming of interfaces in the guest?
Are there any plans to add the acpi_index support?
[1] https://bugzilla.redhat.com/show_bug.cgi?id=1874096#c15
Thank you,
Edy.
1 year, 6 months
hook script for changing disk definition before guest start
by Gionatan Danti
Hi all,
due to this [1] I am trying to change a guest's disk definition from
"pool volume" to "file" via hook scripts.
This seems an easy task via virsh detach-disk and virsh attach-disk, but
virsh can not be called inside libvirt hook scripts. The best approach
would be to change the disk definition right when a disk is attached,
but I can not find any event calling a hook script when a disk is
attache/detached.
Do you have any suggestion short of monitoring the directory
/etc/libvirt/qemu itself for changed files?
Thanks.
[1] https://github.com/cockpit-project/cockpit-machines/issues/815
--
Danti Gionatan
Supporto Tecnico
Assyoma S.r.l. - www.assyoma.it
email: g.danti(a)assyoma.it - info(a)assyoma.it
GPG public key ID: FF5F32A8
1 year, 6 months
Re: How to check tap device for sndbuf when I set sndbuf=0 in the interface xml
by Yalan Zhang
cc libvirt-users for more inputs
Hi,
I'm trying to find out how to check sndbuf for a tap device, could you
please help to check it?
In kernel 2.6.18, the tap device's default sndbuf is 1MB. There is a RFE
bug[1] and patch[2] to introduce the option below in libvirt to adjust the
sndbuf.
<tune>
<sndbuf>1600</sndbuf>
</tune>
It is said in the patch[2] that when we set sndbuf=0, we actually set it to
0xffffffff.
How to check if it is set successfully? I have checked the below files, the
value didn't change after I start a vm with sndbuf=0
# grep . /proc/sys/net/core/*mem_default
/proc/sys/net/core/rmem_default:212992
/proc/sys/net/core/wmem_default:212992
And from the doc[3]: "The default value is set by the
/proc/sys/net/core/wmem_default file and the maximum allowed value is set
by the /proc/sys/net/core/wmem_max file."
Current kernel 5.14.0-177.el9 has some updates about sndbuf:
# cat /proc/sys/net/core/wmem_default
212992
# cat /proc/sys/net/core/wmem_max
212992
Thank you!
[1] Bug 665293 <https://bugzilla.redhat.com/show_bug.cgi?id=665293> - RFE:
Allow setting size of send buffer per TAP device in QEMU driver
[2] https://listman.redhat.com/archives/libvir-list/2011-January/032763.html
[3] https://man7.org/linux/man-pages/man7/socket.7.html
Yalan
1 year, 6 months
Video device model set resolution does not work
by 陈新隆
Hi team,
I've add a resolution sub-element to vga video device model, and the x
attribute is 1920, y attribute is 1080. Dumped domain xml as follow :
bash-4.4# virsh list
> Authorization not available. Check if polkit service is running or see
> debug message for more information.
> Id Name State
> -----------------------------------
> 1 proj1_vm-4uaz57bh running
> bash-4.4# virsh dumpxml proj1_vm-4uaz57bh | grep -i -10 vga
> Authorization not available. Check if polkit service is running or see
> debug message for more information.
> <alias name='input1'/>
> </input>
> <input type='keyboard' bus='ps2'>
> <alias name='input2'/>
> </input>
> <graphics type='vnc'
> socket='/var/run/kubevirt-private/dfe7d514-63f1-4e97-b642-f93109d5aa2f/virt-vnc'>
> <listen type='socket'
> socket='/var/run/kubevirt-private/dfe7d514-63f1-4e97-b642-f93109d5aa2f/virt-vnc'/>
> </graphics>
> <audio id='1' type='none'/>
> <video>
> <model type='vga' vram='65536' heads='1' primary='yes'>
> <resolution x='1920' y='1080'/>
> </model>
> <alias name='video0'/>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x01'
> function='0x0'/>
> </video>
> <memballoon model='virtio-non-transitional'>
> <stats period='10'/>
> <alias name='balloon0'/>
> <address type='pci' domain='0x0000' bus='0x07' slot='0x00'
> function='0x0'/>
> </memballoon>
It does work on my ubuntu guest, but it doesn't work on centos / windows
guest. Is there any way to solve this problem ?
1 year, 6 months
Booting from USB device
by Simon Fairweather
I have a hooks file to hotplug a USB device at the prepare stage.
Using OVMF version 2.6 this works fine, but using OVMF 2.7 the guest no
longer boots from the USB device.
Option 1) For it to work I have to set the boot order on the USB device and
once the OVMF Shell appears I can reset it and it will find the USB device
and boot.
Option 2) Another setup which works if I remove all boot order settings
from the guest and have a boot dev = 'fd' and this works every time.but I
cannot add multiple entries.
<os>
<type arch='x86_64' machine='pc-q35-5.1'>hvm</type>
<loader readonly='yes'
type='pflash'>/usr/share/qemu/ovmf-x64/OVMF_CODE-pure-efi-tpm.fd</loader>
<nvram>/etc/libvirt/qemu/nvram/b96bfc99-3612-0daa-9d8c-69e9d550d05a_VARS-pure-efi-tpm.fd</nvram>
<boot dev='fd'/>
<boot dev='hd'/>
Any thoughts on how to get option 1) to working without having to do a
reset.
1 year, 6 months
failed to load seccomp syscall filter in kernel: Operation canceled
by Jiatong Shen
Hello community,
I am operating an openstack cluster where applications (libvirt/nova
etc) are running using containers. The compute node's arch is aarch64
(phytium 2500), when there are virtual machines around 60 or 70, I failed
to boot new virtual machines and faced with following error message,
error: internal error: qemu unexpectedly closed the monitor:
2022-10-24T06:23:54.545685Z qemu-system-aarch64: -sandbox
on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny:
failed to load seccomp syscall filter in kernel: Operation canceled
Interestingly, if I virsh stop one virtual machine, I am able to boot
another. Besides, I managed to manually boot a virtual machine without any
issue. So my question is what could be the potential cause of this behavior
and how can I deal with it? Thank you very much in advance for the help.
--
Best Regards,
Jiatong Shen
1 year, 6 months
