August 2015 - Users - libvirt List Archives

[libvirt-users] NVidia Grid on libvirt.
by Dominique Ramaekers 10 Aug '15

10 Aug '15

Hi, I'm investigating the possibility to use a Nvidia Grid graphics card to use in libvirt. I found this resource on the subject from the end of 2014: http://www.linux-kvm.org/images/b/b3/01x09b-VFIOandYou-small.pdf It should be possible. However libvirt didn't support it at that time. Does anyone has experience on the subject? Greetings, Dominique.

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[libvirt-users] NVidia Grid on libvirt.
by Dominique Ramaekers 09 Aug '15

09 Aug '15

Hi, I'm investigating the possibility to use a Nvidia Grid graphics card to use in libvirt. I found this resource on the subject from the end of 2014: http://www.linux-kvm.org/images/b/b3/01x09b-VFIOandYou-small.pdf It should be possible. However libvirt didn't support it at that time. Does anyone has experience on the subject? Greetings, Dominique.

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[libvirt-users] Enabling capabilities in a container
by Peter Steele 09 Aug '15

09 Aug '15

I'm using libvirt_lxc to create and manage various containers. I need to enable certain capabilities in a container to support ctdb, and as a quick solution I decided to just enable them all. I *thought* this would do the trick, adding the following XML to my container config: <features> <capabilities policy='allow'> </capabilities> </features> After adding this to my container, I restarted it and tried to start the ctdb service again: # systemctl start ctdb.service Job for ctdb.service failed. See 'systemctl status ctdb.service' and 'journalctl -xn' for details. # systemctl status ctdb.service ctdb.service - CTDB Loaded: loaded (/usr/lib/systemd/system/ctdb.service; disabled) Active: failed (Result: exit-code) since Tue 2015-08-04 14:10:39 PDT; 8s ago Process: 4612 ExecStart=/usr/sbin/ctdbd_wrapper /run/ctdb/ctdbd.pid start (code=exited, status=1/FAILURE) Aug 04 14:10:37 pws-01 systemd[1]: Starting CTDB... Aug 04 14:10:37 pws-01 ctdbd[4629]: CTDB starting on node Aug 04 14:10:37 pws-01 ctdbd[4631]: Starting CTDBD (Version 2.5.4) as PID: 4631 Aug 04 14:10:37 pws-01 ctdbd[4631]: Created PID file /run/ctdb/ctdbd.pid Aug 04 14:10:37 pws-01 ctdbd[4631]: Unable to set scheduler to SCHED_FIFO (Operation not permitted) Aug 04 14:10:37 pws-01 ctdbd[4631]: CTDB daemon shutting down Aug 04 14:10:39 pws-01 ctdbd_wrapper[4612]: CTDB exited during initialisation - check logs. Aug 04 14:10:39 pws-01 systemd[1]: ctdb.service: control process exited, code=exited status=1 Aug 04 14:10:39 pws-01 systemd[1]: Failed to start CTDB. Aug 04 14:10:39 pws-01 systemd[1]: Unit ctdb.service entered failed state. This implies that the container still doesn't have access to the capabilities it needs to use. I believe this error in fact is caused by the container not having the sys_nice capability. So I tried to allow this specific capability using: <features> <capabilities policy='default'> <sys_nice state='on'/> </capabilities> </features> This did not work either. So, what *is* the correct way to add capabilities to a container?

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[libvirt-users] Cannot boot libvirt guests with OVMF. Raw qemu-kvm works as expected
by Ryan Barry 07 Aug '15

07 Aug '15

Using: edk2.git-0-20150803.b1141.ga0973dc.x86_64 edk2.git-ovmf-x64-0-20150802.b1139.gb234418.noarch On Fedora 22. Provisioning a i440FX system in virt-manager and attempting to boot results in successful EFI initialization, but the VM exits ungracefully after the bootloader (with F22 and CentOS 7 installer images). There's no really useful information in any of the logs. Using qemu-kvm directly (qemu-kvm -bios /usr/share/edk2.git/ovmf-x64/OVMF_CODE-pure-efi.fd -m 1G -cdrom ~rbarry/Downloads/Fedora-Server-netinst-x86_64-22.iso) boots and loads successfully. What's the difference here? Where can I go for troubleshooting? libvirt XML is below: <domain type='kvm'> <name>fedora22</name> <uuid>7f363d28-881f-4240-97eb-9b8d49cfb282</uuid> <memory unit='KiB'>2097152</memory> <currentMemory unit='KiB'>2097152</currentMemory> <vcpu placement='static'>1</vcpu> <os> <type arch='x86_64' machine='pc-i440fx-2.3'>hvm</type> <loader readonly='yes' type='pflash'>/usr/share/edk2.git/ovmf-x64/OVMF_CODE-pure-efi.fd</loader> <nvram>/var/lib/libvirt/qemu/nvram/fedora22_VARS.fd</nvram> </os> <features> <acpi/> <apic/> <pae/> </features> <cpu mode='custom' match='exact'> <model fallback='allow'>Haswell-noTSX</model> </cpu> <clock offset='utc'> <timer name='rtc' tickpolicy='catchup'/> <timer name='pit' tickpolicy='delay'/> <timer name='hpet' present='no'/> </clock> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>restart</on_crash> <pm> <suspend-to-mem enabled='no'/> <suspend-to-disk enabled='no'/> </pm> <devices> <emulator>/usr/bin/qemu-kvm</emulator> <disk type='file' device='disk'> <driver name='qemu' type='qcow2'/> <source file='/var/lib/libvirt/images/fedora22.qcow2'/> <target dev='vda' bus='virtio'/> <boot order='1'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/> </disk> <disk type='file' device='cdrom'> <driver name='qemu' type='raw'/> <source file='/home/rbarry/Downloads/Fedora-Server-netinst-x86_64-22.iso'/> <target dev='hda' bus='ide'/> <readonly/> <boot order='2'/> <address type='drive' controller='0' bus='0' target='0' unit='0'/> </disk> <controller type='usb' index='0' model='ich9-ehci1'> <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x7'/> </controller> <controller type='usb' index='0' model='ich9-uhci1'> <master startport='0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0' multifunction='on'/> </controller> <controller type='usb' index='0' model='ich9-uhci2'> <master startport='2'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x1'/> </controller> <controller type='usb' index='0' model='ich9-uhci3'> <master startport='4'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x2'/> </controller> <controller type='pci' index='0' model='pci-root'/> <controller type='ide' index='0'> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/> </controller> <controller type='virtio-serial' index='0'> <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/> </controller> <interface type='network'> <mac address='52:54:00:35:b6:00'/> <source network='default'/> <model type='virtio'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface> <serial type='pty'> <target port='0'/> </serial> <console type='pty'> <target type='serial' port='0'/> </console> <channel type='unix'> <source mode='bind' path='/var/lib/libvirt/qemu/channel/target/fedora22.org.qemu.guest_agent.0'/> <target type='virtio' name='org.qemu.guest_agent.0'/> <address type='virtio-serial' controller='0' bus='0' port='1'/> </channel> <channel type='spicevmc'> <target type='virtio' name='com.redhat.spice.0'/> <address type='virtio-serial' controller='0' bus='0' port='2'/> </channel> <input type='tablet' bus='usb'/> <input type='mouse' bus='ps2'/> <input type='keyboard' bus='ps2'/> <graphics type='spice' autoport='yes'> <image compression='off'/> </graphics> <sound model='ich6'> <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/> </sound> <video> <model type='qxl' ram='65536' vram='65536' vgamem='16384' heads='1'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/> </video> <redirdev bus='usb' type='spicevmc'> </redirdev> <redirdev bus='usb' type='spicevmc'> </redirdev> <memballoon model='virtio'> <address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/> </memballoon> </devices> </domain>

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[libvirt-users] UDP unicast network backend (QEMU)
by Stanley Karunditu 05 Aug '15

05 Aug '15

In 2012 QEMU added UDP unicast network backend support https://github.com/qemu/qemu/commit/0e0e7facc775e9bb020314f48751b3d09f316c8… Checked latest libvirt on the git repo, and didn't see this as an option. So tried to use the mcast tunnel mode. I keep getting duplicate packets with BPDUs and LLDP packets going between the Point to point connection between the VMs. VMs have bridges on them. When I used the TCP tunnel interface, if the client came up before the server end, the connection failed to establish. So both methods not super reliable. If I manually change the netdev settings to use unicast udp tunneling the connection is way more stable just like the GNS3 connections. Has anyone written support for UDP unicast network backend for QEMU and the patch is awaiting review? Searched mailing list and couldn't find a bug covering this. Just want to be sure no one has worked on this before creating a patch to add this support.

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