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[libvirt-users] kernel panic when using root from virtfs
by Vasiliy Tolstov 11 Mar '14

11 Mar '14

I have strange kernel panic Kernel 3.13.3 vanilla root is mounted via 9p virtfs (readonly). virsh --version 1.2.1 qemu --version QEMU emulator version 1.7.0, Copyright (c) 2003-2008 Fabrice Bellard systemd version 210 Domain config: <domain type='kvm'> <name>build</name> <uuid>328891df-b3c3-aee9-eb5d-00007e7934f7</uuid> <memory unit='MiB'>512</memory> <currentMemory unit='MiB'>512</currentMemory> <vcpu placement='static'>2</vcpu> <resource> <partition>/machine</partition> </resource> <os> <type arch='x86_64' machine='pc-1.0'>hvm</type> <boot dev='hd'/> <kernel>/boot/vmlinuz-3.13.3</kernel> <initrd>/boot/initrd-3.13.3</initrd> <cmdline>ro root=virtfs:root console=tty0 console=ttyS0,115200n8 </cmdline> </os> <features> <acpi/> <apic/> <pae/> </features> <clock offset='utc'/> <on_poweroff>destroy</on_poweroff> <on_reboot>destroy</on_reboot> <on_crash>destroy</on_crash> <devices> <emulator>/usr/bin/qemu-system-x86_64</emulator> <filesystem type='mount' accessmode='squash'> <driver type='path' wrpolicy='immediate'/> <source dir='/home/vtolstov/devel/vtolstov/lb/fs/x86_64'/> <target dir='root'/> <readonly/> </filesystem> <filesystem type='mount' accessmode='squash'> <driver type='path' wrpolicy='immediate'/> <source dir='/home/vtolstov/devel/vtolstov/lb/fs/var/log'/> <target dir='var/log'/> </filesystem> <filesystem type='mount' accessmode='squash'> <driver type='path' wrpolicy='immediate'/> <source dir='/home/vtolstov/devel/vtolstov/lb/fs/var/cache/paludis'/> <target dir='var/cache/paludis'/> </filesystem> <filesystem type='mount' accessmode='squash'> <driver type='path' wrpolicy='immediate'/> <source dir='/home/vtolstov/devel/vtolstov/lb/fs/var/db/paludis'/> <target dir='var/db/paludis'/> </filesystem> <controller type='virtio-serial' index='0'> <alias name='virtio-serial0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/> </controller> <controller type='pci' index='0' model='pci-root'> <alias name='pci0'/> </controller> <controller type='ide' index='0'> <alias name='ide0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/> </controller> <interface type='network'> <mac address='52:54:00:00:02:4c'/> <source network='mighost'/> <model type='virtio'/> <alias name='net0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface> <serial type='pty'> <source path='/dev/pts/8'/> <target port='0'/> <alias name='serial0'/> </serial> <console type='pty' tty='/dev/pts/8'> <source path='/dev/pts/8'/> <target type='serial' port='0'/> <alias name='serial0'/> </console> <channel type='spicevmc'> <target type='virtio' name='com.redhat.spice.0'/> <alias name='channel0'/> <address type='virtio-serial' controller='0' bus='0' port='1'/> </channel> <channel type='unix'> <source mode='bind' path='/var/lib/libvirt/qemu/build.agent'/> <target type='virtio' name='org.mighost.agent.0'/> <alias name='channel1'/> <address type='virtio-serial' controller='0' bus='0' port='2'/> </channel> <input type='mouse' bus='ps2'/> <graphics type='vnc' port='5905' autoport='yes' listen='0.0.0.0'> <listen type='address' address='0.0.0.0'/> </graphics> <video> <model type='vga' vram='9216' heads='1'/> <alias name='video0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/> </video> <memballoon model='virtio'> <alias name='balloon0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/> </memballoon> </devices> <seclabel type='none'/> </domain> Sometimes i get error like: [ OK ] Reached target Initrd File Systems. Starting dracut mount hook... [ 14.326081] FDC 0 is a S82078B [ 14.644148] PANIC: double fault, error_code: 0x0 [ 14.640174] PANIC: double fault, error_code: 0x0 [ 14.640174] CPU: 0 PID: 130 Comm: systemd-udevd Not tainted 3.13.3 #2 [ 14.640174] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 14.640174] task: ffff88001faf0000 ti: ffff88001faee000 task.ti: ffff88001faee000 [ 14.640174] RIP: 0010:[<ffffffff81109df8>] [<ffffffff81109df8>] file_read_actor+0x58/0x160 [ 14.640174] RSP: 0018:ffff88001faefd60 EFLAGS: 00010206 [ 14.640174] RAX: 0000000000000000 RBX: ffff88001faefe10 RCX: 000000000000100f [ 14.640174] RDX: 0000000000000000 RSI: ffffea000070ebc0 RDI: 00007f94d60b3037 [ 14.640174] RBP: ffff88001faefd90 R08: 0000000000000002 R09: ffffea000070ebdc [ 14.640174] R10: 0000000000000023 R11: 0000000000000000 R12: 0000000000001000 [ 14.640174] R13: 000000000001f000 R14: ffff88001f9d5e00 R15: 0000000000001000 [ 14.640174] FS: 00007f94d60dc7c0(0000) GS:ffff88001f400000(0000) knlGS:0000000000000000 [ 14.640174] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 14.640174] CR2: 0000000000000000 CR3: 000000001fad9000 CR4: 00000000000006f0 [ 14.640174] Stack: [ 14.640174] ffff88001faefd70 ffff88001e025280 0000000000000021 0000000000001000 [ 14.640174] ffff88001f9d5e00 ffffea000070ebc0 ffff88001faefe58 ffffffff8110a1ca [ 14.640174] ffff88001f9d5e10 ffff88001faefe90 ffff88001faefea0 0000000000000000 [ 14.640174] Call Trace: [ 14.640174] [<ffffffff8110a1ca>] generic_file_aio_read+0x2ca/0x700 [ 14.640174] [<ffffffff811a11f6>] blkdev_aio_read+0x46/0x70 [ 14.640174] [<ffffffff8116c355>] do_sync_read+0x55/0x90 [ 14.640174] [<ffffffff8116c9e0>] vfs_read+0x90/0x160 [ 14.640174] [<ffffffff8116d4e4>] SyS_read+0x44/0xa0 [ 14.640174] [<ffffffff816ab07d>] system_call_fastpath+0x1a/0x1f [ 14.640174] Code: 38 31 c0 66 66 90 c6 01 00 66 66 90 85 c0 0f 85 bf 00 00 00 49 63 fc 48 8d 7c 39 ff 48 31 f9 48 f7 c1 00 f0 ff ff 74 11 66 66 90 <c6> 07 00 66 66 90 85 c0 0f 85 c6 00 00 00 65 ff 04 25 e0 c7 00 [ 14.640174] Kernel panic - not syncing: Machine halted. [ 14.644148] CPU: 1 PID: 126 Comm: systemd-udevd Not tainted 3.13.3 #2 [ 14.644148] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 14.644148] task: ffff88001fa42f80 ti: ffff88001fa84000 task.ti: ffff88001fa84000 [ 14.644148] RIP: 0010:[<ffffffff81109df8>] [<ffffffff81109df8>] file_read_actor+0x58/0x160 [ 14.644148] RSP: 0018:ffff88001fa85d60 EFLAGS: 00010206 [ 14.644148] RAX: 0000000000000000 RBX: ffff88001fa85e10 RCX: 000000000000100f [ 14.644148] RDX: 0000000000000000 RSI: ffffea0000708340 RDI: 00007f94d60cb037 [ 14.644148] RBP: ffff88001fa85d90 R08: 0000000000000002 R09: ffffea000070835c [ 14.644148] R10: 000000000000003b R11: 0000000000000001 R12: 0000000000001000 [ 14.644148] R13: 0000000000007000 R14: ffff88001f9d3900 R15: 0000000000001000 [ 14.640174] Shutting down cpus with NMI [ 14.644148] FS: 00007f94d60dc7c0(0000) GS:ffff88001f500000(0000) knlGS:0000000000000000 [ 14.644148] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 14.644148] CR2: 0000000000000000 CR3: 000000001fa67000 CR4: 00000000000006e0 [ 14.644148] Stack: [ 14.644148] ffff88001fa85d70 ffff88001e2522c0 0000000000000039 0000000000001000 [ 14.644148] ffff88001f9d3900 ffffea0000708340 ffff88001fa85e58 ffffffff8110a1ca [ 14.644148] ffff88001f9d3910 ffff88001fa85e90 ffff88001fa85ea0 0000000000000000 [ 14.644148] Call Trace: [ 14.644148] [<ffffffff8110a1ca>] generic_file_aio_read+0x2ca/0x700 [ 14.644148] [<ffffffff811a11f6>] blkdev_aio_read+0x46/0x70 [ 14.644148] [<ffffffff8116c355>] do_sync_read+0x55/0x90 [ 14.644148] [<ffffffff8116c9e0>] vfs_read+0x90/0x160 [ 14.644148] [<ffffffff8116d4e4>] SyS_read+0x44/0xa0 [ 14.644148] [<ffffffff816ab07d>] system_call_fastpath+0x1a/0x1f [ 14.644148] Code: 38 31 c0 66 66 90 c6 01 00 66 66 90 85 c0 0f 85 bf 00 00 00 49 63 fc 48 8d 7c 39 ff 48 31 f9 48 f7 c1 00 f0 ff ff 74 11 66 66 90 <c6> 07 00 66 66 90 85 c0 0f 85 c6 00 00 00 65 ff 04 25 e0 c7 00 -- Vasiliy Tolstov, e-mail: v.tolstov(a)selfip.ru jabber: vase(a)selfip.ru

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Re: [libvirt-users] cgroup for VM - does it work properly?
by Martin Pavlásek 11 Mar '14

11 Mar '14

On Thu 06 Mar 2014 20:16:45 CET, Martin Pavlásek wrote: > On 06/03/14 10:35, Daniel P. Berrange wrote: >> On Thu, Mar 06, 2014 at 12:32:28AM +0100, Martin Pavlásek wrote: >>> Hi >>> >>> I tried to restrict usage of some running VM by cpu.shares (i.e. set to >>> 10 from original 1024) on loaded system and it seem doesn't work as I >>> expected... all running processes has same CPU usage (by htop) :-/ >>> Does anyone has same experience? >> The cpu.shares variable doesn't provide absolute restriction on >> CPU usage, rather it is doing relative prioritization. >> >> eg if you have 2 cgroups that are at the same level in the hierarchy >> and you give one shares=512 and one shared=1024, then the latter VM >> will get twice the CPU scheduler time of the former. If the latter >> VM is completely idle though, the former VM will not be capped in any >> way. >> >> If you want absolute caps then you need to use period/quota settings. >> Also you want todo this via the virsh schedinfo command, not accessing >> cgroups directly. >> >> Regards, >> Daniel > Thanks Daniel for reply, nice example! > In my case I've got quite weird results > > guest: dd if=/dev/zero of=/dev/null for simulating heavy load > host: dd if=... same as guest (to make host also loaded) > > host: htop for watching CPU usage (host has only one core), qemu (one > VM, two threads) + dd (host) = 99% usage that is correct, as expected > host: virsh schedinfo --set cpu_shares=10 <domain-ID> > ...but whole load is still distributed equally - still ~30% for each. > > All processes are under itself default cgroup, so / for host dd and each > VM in their own (something like /machine/<domain-name>). I didn't change > any cgroup directly in this case. > After that qemu processes should shoconsume significantly less cpu than > others, isn't it (change "relative priority" from 1024 to 10)? > Limiting by period or quota works, but I would be really happy to use > just cpu.shares - I don't want to write own process scheduler, weights > of cpu sharing is sufficient for me. > > Do you have idea why this behaviour happen? > Regards > I just find out what was wrong... :-) cpu.shares is applied only to process in same cgroup, so all common processes belong to / (cgroup root), all VMs under /machine/. So dd running on host belongs to /, but when I set cpu.shares of any VM, it wouldn't apply as I expected, because these processes are exists in different cgroups. PS: I'm sorry Danied for answer only to you, I've mismatched Reply and Reply to all... -- -- Martin Pavlásek <mpavlase(a)redhat.com> OpenStack QA Associate/Red Hat Czech/BRQ irc: mpavlase

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[libvirt-users] Fwd: How to get guest's cpu and mem usage with Java APIs
by Enrico De Maio 11 Mar '14

11 Mar '14

I would like to know how much memory and cpu virtual machine are using so yes guest's perspective. I'm building a web app that has to alert the user when the vm is going to be stressed and I would like to do this in terms of mem and cpu usage. Thanks in advance for your support, Enrico De Maio On Mon, Mar 10, 2014 at 7:16 PM, Eric Blake <eblake(a)redhat.com> wrote: > On 03/10/2014 04:54 AM, Enrico De Maio wrote: > > Hi everybody, > > > > I'm using libvirt java api bindings for my thesis. I would like to know > if > > there is a way to obtain live information about cpu and mem usage of a > > domain. > > Are you asking the question from the host's perspective (how much > resources has the host given to the guest) or from the guest's > perspective (how much is the guest actively using, even if the host has > given it more)? Libvirt already provides several API calls. such as the > ones used by 'virsh cpu-stats' and 'virsh dommemstat'; you may have to > do some code reading to figure out what C calls the virsh code made in > order to find the same API under the Java bindings. > > -- > Eric Blake eblake redhat com +1-919-301-3266 > Libvirt virtualization library http://libvirt.org > >

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[libvirt-users] How to get guest's cpu and mem usage with Java APIs
by Enrico De Maio 11 Mar '14

11 Mar '14

Hi everybody, I'm using libvirt java api bindings for my thesis. I would like to know if there is a way to obtain live information about cpu and mem usage of a domain. Regards, Enrico De Maio Skype: enrico.de.maio Mobile: +39 338 205 3397

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[libvirt-users] Question about virtio drivers
by pa1n_0 10 Mar '14

10 Mar '14

Hello, Any ideas from which version of virtio drivers support well high-end configuration like >= 8 physicals CPUs and >=24Go. I know that using the last version is the way to do but someone would like to know an accurate version. Thanks for answer.

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[libvirt-users] "connection refused", but server is listening
by Pasquale Dir 09 Mar '14

09 Mar '14

netstat -lptu gives me tcp6 0 0 [::]:16514 [::]:* LISTEN 1314/libvirtd so the server is correctly listening on interfaces. My /etc/libvirt/libvirtd settings are defaulted. My /etc/default/libvirt-bin has "-d -l" options so server is listening. If I do virsh -c qemu://143.225.229.190/system (that is my ip or an ip belonging to my network) I get "connection refused". How come? And note that if I put my address, 143.225.229.190, as listening address in the libvirtd conf file, I get "this address class is not supported".

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[libvirt-users] create ovs port without root
by Vasiliy Tolstov 08 Mar '14

08 Mar '14

Hello! How can i operate with openvswitch without root rights? For example - i can add my user to kvm group and create vm from libvirt with my own user, but now i'm failed with creating port. errors in logs: Mar 06 14:04:46 selfip.ru ovs-vsctl[19065]: ovs|00001|vsctl|INFO|Called as ovs-vsctl --timeout=5 -- --if-exists del-port Mar 06 14:04:46 selfip.ru ovs-vsctl[19065]: ovs|00002|vsctl|ERR|'del-port' command requires at least 1 arguments Mar 06 14:04:46 selfip.ru libvirtd[6418]: internal error: Child process (ovs-vsctl --timeout=5 -- --if-exists del-port) unexpected exit status 1: ovs-vsctl: 'del-port' command requires at least 1 arguments Mar 06 14:04:46 selfip.ru libvirtd[6418]: Unable to delete port (null) from OVS: Operation not permitted -- Vasiliy Tolstov, e-mail: v.tolstov(a)selfip.ru jabber: vase(a)selfip.ru

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[libvirt-users] ISO refuses to let vm starts (and is not mentioned in config)
by Mauricio Tavares 07 Mar '14

07 Mar '14

Trying to start one of my vms, a centos one at that, but am getting the following message: [root@vmhost ~]# virsh start voip --paused error: Failed to start domain voip error: cannot open file '/var/tmp/FreePBX-5.211.65-3-x86_64-Full-1388073872.iso': No such file or directory [root@vmhost ~]# But, virsh dumpxml voip shows no info onto the .iso <disk type='file' device='disk'> <driver name='qemu' type='raw' cache='none' io='native'/> <source file='/dev/vmhost_vg0/voip'/> <target dev='vda' bus='virtio'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/> </disk> <disk type='file' device='cdrom'> <driver name='qemu' type='raw'/> <target dev='hda' bus='ide'/> <readonly/> <address type='drive' controller='0' bus='0' target='0' unit='0'/> </disk> <disk type='file' device='cdrom'> <driver name='qemu' type='raw'/> <target dev='hdb' bus='ide'/> <readonly/> <address type='drive' controller='0' bus='0' target='0' unit='1'/> </disk> Log file is not particularly helpful: 2014-03-04 22:57:46.121+0000: shutting down 2014-03-05 23:42:18.528+0000: shutting down 2014-03-05 23:47:07.375+0000: shutting down 2014-03-06 00:56:32.908+0000: shutting down 2014-03-06 01:11:32.582+0000: shutting down So, the question is how did this iso got involved in this specific vm? I can start my other vms without them even knowing about this .iso.

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[libvirt-users] Attaching a hostdev on startup
by Mat Arge 07 Mar '14

07 Mar '14

Hello! I have written a script which attaches some USB tokens as hostdev devices to (qemu) VMs managed by libvirt. This works fine as long as I call the script manually. But what I really want to do, is run this scrip from a startup hook, so that whenever a Vm is started, it looks if there are appopriate tokens available for attachment. But when the script is run from the hook, it (along with the whole libvirtd) freezes. That doesn't really come as a surprise, since http://libvirt.org/hooks.html explicitely states A hook script must not call back into libvirt, as the libvirt daemon is already waiting for the script to exit. A deadlock is likely to occur. How can I get around this problem? cheers Mat

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[libvirt-users] Providing fallback DNS servers via DHCP
by Florian Rüchel 07 Mar '14

07 Mar '14

Hello everyone, TL;DR: Is ist possible to provide a secondary DNS (e.g. 8.8.8.8) via DHCP in addition to the gateway (in my case 10.0.1.1)? I use libvirt to manage all my qemu-based VMs. I have set up a local NAT-network which includes all my VMs (and some physical servers integrated via VPN). Everything works fine, but ocassionally, I have to restart the network (when I add instances for example). In that case, my VMs loose their local network connection until I restart them. However, some instances can not be restarted at will and so a change in network configuration means they loose their local connectivity. However, they still have a second network device that has an external static IP. This IP can still connect and be connected to, so it is feasible to loose the connection on the local network. Unfortunately though, libvirt (through dnsmasq's DHCP) broadcasts itself as the only DNS. This results in name resolution going down. If I add e.g. 8.8.8.8 to resolv.conf, I can resolve names again (except local ones, of course). So it would be nice if the DHCP would directly supply additional DNS servers. For dnsmasq, I would add to the configuration something like dhcp-option=6,0.0.0.0,8.8.8.8 However, looking through the archive, I found that you guys prefer to keep it implementation agnostic and thus you do not provide the option to set this directly (since this is dnsmasq-only). So I was wondering if there is any way to achieve this with libvirt? Is there already an implemented way I could not find? Or is there maybe a *generic* option to provide some kind of extra-configuration specific to the implementation? Or is my only solution to make sure the clients manually add a second DNS by themselves? Regards, Florian

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