- Users - libvirt List Archives

[libvirt-users] OVMF / UEFI boot abnormally
by Allence 28 Aug '18

28 Aug '18

Hey guys, today I use ovmf to start win10 guests, my monitor is not bright But is it normal for me to use seabios? why? The next message is my detailed settings. ovmf: os: <loader readonly='yes' type='pflash'>/root/OVMF_CODE.fd</loader> <nvram>/root/OVMF_VARS.fd</nvram> vga: <qemu:arg value='-device'/> <qemu:arg value='vfio-pci,host=01:00.0,romfile=/root/10de:1b06:19da:1474.dump,multifunction=on'/> bios: os: <loader readonly='yes' type='rom'>/usr/share/qemu/bios.bin</loader> vga: <qemu:arg value='-device'/> <qemu:arg value='vfio-pci,host=01:00.0,romfile=/root/us.dump,multifunction=on,x-vga=on'/> And this is my kvm environment: qemu: 2.12.0 libvirt: 4.14 kernel: 4.17.2 host: Lfs-8.2(as similar as ubuntu)

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[libvirt-users] Download image to libvirt storage pool
by Shashwat shagun 27 Aug '18

27 Aug '18

Is there any function in libvirt (golang SDK) to download image to libvirt storage pool from path?

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[libvirt-users] libvirt and virt-manager - Unable to complete install: 'internal error: unsupported input bus usb'
by Eduardo Lúcio Amorim Costa 23 Aug '18

23 Aug '18

I'm trying create a virtual machine using Xen as hypervisor and virt-manager (libvirt) as the management module. When trying to create the virtual machine I am getting the following error: " Unable to complete install: 'internal error: unsupported input bus usb' " ERROR DETAILS: Unable to complete install: 'internal error: unsupported input bus usb' Traceback (most recent call last): File "/usr/share/virt-manager/virtManager/asyncjob.py", line 75, in cb_wrapper callback(asyncjob, *args, **kwargs) File "/usr/share/virt-manager/virtManager/create.py", line 2276, in _do_async_install guest.start_install(meter=meter) File "/usr/share/virt-manager/virtinst/guest.py", line 461, in start_install doboot, transient) File "/usr/share/virt-manager/virtinst/guest.py", line 397, in _create_guest domain = self.conn.createXML(install_xml or final_xml, 0) File "/usr/lib/python3.7/site-packages/libvirt.py", line 3717, in createXML if ret is None:raise libvirtError('virDomainCreateXML() failed', conn=self) libvirt.libvirtError: internal error: unsupported input bus usb NOTE I: The deploy process follows the instructions here https://www.youtube.com/watch?v=BwkmDM-Gpzc and here https://wiki.centos.org/HowTos/Xen/Xen4QuickStart . NOTE II: Xen Hypervisor uses a CentOS 7 as "domu". MORE INFORMATION ABOUT THE PROBLEM HERE: https://unix.stackexchange.com/q/464186/61742 Thanks! =D

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[libvirt-users] Guest startup delay options ignored
by Inception Hosting 23 Aug '18

23 Aug '18

Hi Folks, been searching around for a while on this and see similar issues reported going back a number of years without solution. The START_DELAY=(number) seems to be completely ignored in /etc/sysconfig/libvirt-guests which is unfortunate as it means everything starts at once without control. This is fine on NVMe based servers however on the older spinning disks the I/O is creating significant issues. Is anyone aware of any other methods to achieve a start up delay for guest virtual machines on boot? Thanks. Anthony.

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[libvirt-users] Efficacy of jitterentropy RNG on qemu-kvm Guests
by procmem 17 Aug '18

17 Aug '18

Hello. I'm a distro maintainer and was wondering about the efficacy of entropy daemons like haveged and jitterentropyd in qemu-kvm. One of the authors of haveged [0] pointed out if the hardware cycles counter is emulated and deterministic, and thus predictible. He therefore does not recommend using HAVEGE on those systems. Is this the case with KVM's counters? PS. I will be setting VM CPU settings to host-passthrough. Bonus: Also if anyone knows the answer to this question about Xen please let me know because its the other main platform we support and they don't have the luxury of virtio-rng in PVH mode. Thanks. [0] https://github.com/BetterCrypto/Applied-Crypto-Hardening/commit/cf7cef7a870…

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[libvirt-users] qemu guest agent
by Cobin Bluth 15 Aug '18

15 Aug '18

Hello Libvirt-Users! I have a quick question about the qemu guest agent. Is it possible to use the guest agent from inside the guest in order to query the name of its own domain? For example, I use a base-image.qcow2 with a baked-in hostname. I would like to include a little tool in my guest image to change the hostname to the name of the domain. Is this sort of thing possible? -Cobin

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[libvirt-users] New Application to add to web site
by Matthew 11 Aug '18

11 Aug '18

Hello, Could you please add the OpenVM Dashboard to the list of applications that use libvirt. Below is the URL and description. Also, to all the developers who put libvirt-php together...THANK YOU! Thanks, Matthew Penning URL: https://openvm.tech <https://openvm.tech/> Description: The OpenVM Dashboard is an open source HTML5 and PHP based web interface for the KVM and QEMU hypervisor. It is designed to be a easy-to-use management platform allowing users to create and manage domains (virtual machines) using the libvirt-php module.

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Re: [libvirt-users] Windows Guest I/O performance issues (already using virtio) (Matt Schumacher)
by Allence 09 Aug '18

09 Aug '18

I think performance is not just about your xml, the host system will have a bigger impact. Maybe you can see this link: Https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/ht… >Date: Wed, 8 Aug 2018 17:35:11 +0000 >From: Matt Schumacher <matt.s(a)aptalaska.com> >To: "libvirt-users(a)redhat.com" <libvirt-users(a)redhat.com> >Subject: [libvirt-users] Windows Guest I/O performance issues (already > using virtio) >Message-ID: <30EE4896-CF82-4E23-82D5-0C56B38F5E09(a)aptalaska.com> >Content-Type: text/plain; charset="utf-8" > >List, > >I have a number of Windows 2016 servers I am deploying, but I?m having some I/O performance issues. I have done all of the obvious things like virtio drivers, but am finding there is more performance to be found with hyper-v extensions, how we virtualize the hardware clock, and iothreads. I?m using ZVOLs to back the VM, and I?m using 4k block sizes, which seems to offer the best 4k random read/write performance (mail and database workloads), but maybe I?m missing something at this layer too. > >Questions: > > > 1. Does my VM config look reasonable for the latest releases of windows? Are there features I should be using that will help performance? > 2. Why does the hypervclock timer make so much performance difference in windows VMs? > 3. Does my virtualized CPU model make sense? I defined Haswell-noTSX-IBRS and libvirt added the features. > 4. Which kernel branch offers the best stability and performance? > 5. Are there performance gains in using UEFI booting the windows guest and defining ?<blockio logical_block_size='4096' physical_block_size='4096'/>?? Perhaps better block size consistency through to the zvol? > > >Here is my setup: > >48 core Haswell CPU >192G Ram >Linux 4.14.61 or 4.9.114 (testing both) >ZFS file system on optane SSD drive or ZFS file system on dumb HBA with 8 spindles of 15k disks (testing both) >4k block size zvol for virtual machines >32G arc cache > >Here is my VM: > ><domain type='kvm' id='12'> > <name>testvm</name> > <memory unit='KiB'>33554432</memory> > <currentMemory unit='KiB'>33554432</currentMemory> > <vcpu placement='static'>12</vcpu> > <iothreads>1</iothreads> > <os> > <type arch='x86_64' machine='pc-i440fx-2.12'>hvm</type> > <boot dev='cdrom'/> > <boot dev='hd'/> > </os> > <features> > <acpi/> > <hyperv> > <relaxed state='on'/> > <vapic state='on'/> > <spinlocks state='on' retries='8191'/> > <vpindex state='on'/> > <runtime state='on'/> > <synic state='on'/> > <reset state='on'/> > <vendor_id state='on' value='KVM Hv'/> > </hyperv> > </features> > <cpu mode='custom' match='exact' check='full'> > <model fallback='forbid'>Haswell-noTSX-IBRS</model> > <topology sockets='1' cores='6' threads='2'/> > <feature policy='require' name='vme'/> > <feature policy='require' name='f16c'/> > <feature policy='require' name='rdrand'/> > <feature policy='require' name='hypervisor'/> > <feature policy='require' name='arat'/> > <feature policy='disable' name='spec-ctrl'/> > <feature policy='require' name='xsaveopt'/> > <feature policy='require' name='abm'/> > </cpu> > <clock offset='localtime'> > <timer name='rtc' tickpolicy='catchup'/> > <timer name='pit' tickpolicy='delay'/> > <timer name='hpet' present='yes'/> > <timer name='hypervclock' present='yes'/> > </clock> > <on_poweroff>destroy</on_poweroff> > <on_reboot>restart</on_reboot> > <on_crash>destroy</on_crash> > <devices> > <emulator>/usr/bin/qemu-system-x86_64</emulator> > <disk type='block' device='disk'> > <driver name='qemu' type='raw' cache='none' io='native' ioeventfd='on' iothread='1'/> > <source dev='/dev/zvol/datastore/vm/testvm-vda'/> > <backingStore/> > <target dev='vda' bus='virtio'/> > <alias name='virtio-disk0'/> > <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/> > </disk> > <disk type='file' device='cdrom'> > <driver name='qemu'/> > <target dev='hdc' bus='ide'/> > <readonly/> > <alias name='ide0-1-0'/> > <address type='drive' controller='0' bus='1' target='0' unit='0'/> > </disk> > <controller type='ide' index='0'> > <alias name='ide'/> > <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/> > </controller> > <controller type='usb' index='0' model='piix3-uhci'> > <alias name='usb'/> > <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/> > </controller> > <controller type='pci' index='0' model='pci-root'> > <alias name='pci.0'/> > </controller> > <controller type='virtio-serial' index='0'> > <alias name='virtio-serial0'/> > <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/> > </controller> > <interface type='bridge'> > <source bridge='lan'/> > <target dev='vnet0'/> > <model type='virtio'/> > <alias name='net0'/> > <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> > </interface> > <channel type='unix'> > <source mode='bind' path='/var/lib/libvirt/qemu/channel/target/domain-12-testvm/org.qemu.guest_agent.0'/> > <target type='virtio' name='org.qemu.guest_agent.0' state='connected'/> > <alias name='channel0'/> > <address type='virtio-serial' controller='0' bus='0' port='1'/> > </channel> > <input type='tablet' bus='usb'> > <alias name='input0'/> > <address type='usb' bus='0' port='1'/> > </input> > <input type='mouse' bus='ps2'> > <alias name='input1'/> > </input> > <input type='keyboard' bus='ps2'> > <alias name='input2'/> > </input> > <graphics type='vnc' port='5901' autoport='no' listen='0.0.0.0'> > <listen type='address' address='0.0.0.0'/> > </graphics> > <video> > <model type='cirrus' vram='16384' heads='1' primary='yes'/> > <alias name='video0'/> > <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/> > </video> > <memballoon model='none'/> > </devices> > <seclabel type='dynamic' model='dac' relabel='yes'> > <label>+0:+100</label> > <imagelabel>+0:+100</imagelabel> > </seclabel> ></domain>

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[libvirt-users] Mount URL as cdrom/iso KVM/QEMU
by Inception Hosting 09 Aug '18

09 Aug '18

Hi Folks, According to the examples in http://libvirt.org/formatdomain.html#elementsDisks it should be possible to mount an iso /url as a cdrom, the example given is: </disk> <disk type='network' device='cdrom'> <driver name='qemu' type='raw'/> <source protocol="http" name="url_path"> <host name="hostname" port="80"/> </source> <target dev='hde' bus='ide' tray='open'/> <readonly/> </disk> I am unable to get this to work at all and wondered if I am just missing something obvious: Boot failed: Could not read from CDROM (code 0003) Actual XML in use snippet: <disk type='network' device='cdrom'> <driver name='qemu' type='raw'/> <source protocol="http" name="/debian-cd/current/amd64/iso-cd/debian-9.5.0-amd64-netinst.iso"> <host name="mirror.bytemark.co.uk" port="80"/> </source> <target dev='hdb' bus='ide' tray='open'/> <readonly/> </disk> libvirtd (libvirt) 3.9.0 QEMU emulator version 2.10.0 Is anyone able to offer any assistance or tips? I have tried putting the complete path including fqdn in the url_path as well, with and without http:// Many Thanks. Anthony.

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[libvirt-users] Windows Guest I/O performance issues (already using virtio)
by Matt Schumacher 08 Aug '18

08 Aug '18

List, I have a number of Windows 2016 servers I am deploying, but I’m having some I/O performance issues. I have done all of the obvious things like virtio drivers, but am finding there is more performance to be found with hyper-v extensions, how we virtualize the hardware clock, and iothreads. I’m using ZVOLs to back the VM, and I’m using 4k block sizes, which seems to offer the best 4k random read/write performance (mail and database workloads), but maybe I’m missing something at this layer too. Questions: 1. Does my VM config look reasonable for the latest releases of windows? Are there features I should be using that will help performance? 2. Why does the hypervclock timer make so much performance difference in windows VMs? 3. Does my virtualized CPU model make sense? I defined Haswell-noTSX-IBRS and libvirt added the features. 4. Which kernel branch offers the best stability and performance? 5. Are there performance gains in using UEFI booting the windows guest and defining “<blockio logical_block_size='4096' physical_block_size='4096'/>”? Perhaps better block size consistency through to the zvol? Here is my setup: 48 core Haswell CPU 192G Ram Linux 4.14.61 or 4.9.114 (testing both) ZFS file system on optane SSD drive or ZFS file system on dumb HBA with 8 spindles of 15k disks (testing both) 4k block size zvol for virtual machines 32G arc cache Here is my VM: <domain type='kvm' id='12'> <name>testvm</name> <memory unit='KiB'>33554432</memory> <currentMemory unit='KiB'>33554432</currentMemory> <vcpu placement='static'>12</vcpu> <iothreads>1</iothreads> <os> <type arch='x86_64' machine='pc-i440fx-2.12'>hvm</type> <boot dev='cdrom'/> <boot dev='hd'/> </os> <features> <acpi/> <hyperv> <relaxed state='on'/> <vapic state='on'/> <spinlocks state='on' retries='8191'/> <vpindex state='on'/> <runtime state='on'/> <synic state='on'/> <reset state='on'/> <vendor_id state='on' value='KVM Hv'/> </hyperv> </features> <cpu mode='custom' match='exact' check='full'> <model fallback='forbid'>Haswell-noTSX-IBRS</model> <topology sockets='1' cores='6' threads='2'/> <feature policy='require' name='vme'/> <feature policy='require' name='f16c'/> <feature policy='require' name='rdrand'/> <feature policy='require' name='hypervisor'/> <feature policy='require' name='arat'/> <feature policy='disable' name='spec-ctrl'/> <feature policy='require' name='xsaveopt'/> <feature policy='require' name='abm'/> </cpu> <clock offset='localtime'> <timer name='rtc' tickpolicy='catchup'/> <timer name='pit' tickpolicy='delay'/> <timer name='hpet' present='yes'/> <timer name='hypervclock' present='yes'/> </clock> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>destroy</on_crash> <devices> <emulator>/usr/bin/qemu-system-x86_64</emulator> <disk type='block' device='disk'> <driver name='qemu' type='raw' cache='none' io='native' ioeventfd='on' iothread='1'/> <source dev='/dev/zvol/datastore/vm/testvm-vda'/> <backingStore/> <target dev='vda' bus='virtio'/> <alias name='virtio-disk0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/> </disk> <disk type='file' device='cdrom'> <driver name='qemu'/> <target dev='hdc' bus='ide'/> <readonly/> <alias name='ide0-1-0'/> <address type='drive' controller='0' bus='1' target='0' unit='0'/> </disk> <controller type='ide' index='0'> <alias name='ide'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/> </controller> <controller type='usb' index='0' model='piix3-uhci'> <alias name='usb'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/> </controller> <controller type='pci' index='0' model='pci-root'> <alias name='pci.0'/> </controller> <controller type='virtio-serial' index='0'> <alias name='virtio-serial0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/> </controller> <interface type='bridge'> <source bridge='lan'/> <target dev='vnet0'/> <model type='virtio'/> <alias name='net0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface> <channel type='unix'> <source mode='bind' path='/var/lib/libvirt/qemu/channel/target/domain-12-testvm/org.qemu.guest_agent.0'/> <target type='virtio' name='org.qemu.guest_agent.0' state='connected'/> <alias name='channel0'/> <address type='virtio-serial' controller='0' bus='0' port='1'/> </channel> <input type='tablet' bus='usb'> <alias name='input0'/> <address type='usb' bus='0' port='1'/> </input> <input type='mouse' bus='ps2'> <alias name='input1'/> </input> <input type='keyboard' bus='ps2'> <alias name='input2'/> </input> <graphics type='vnc' port='5901' autoport='no' listen='0.0.0.0'> <listen type='address' address='0.0.0.0'/> </graphics> <video> <model type='cirrus' vram='16384' heads='1' primary='yes'/> <alias name='video0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/> </video> <memballoon model='none'/> </devices> <seclabel type='dynamic' model='dac' relabel='yes'> <label>+0:+100</label> <imagelabel>+0:+100</imagelabel> </seclabel> </domain>

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