April 2011 - Devel - libvirt List Archives

[Libvir] Hang with virt-install graphic=no on FC 6 6.93/F7 RC2
by libvirtuser 23 Dec '25

23 Dec '25

I had this problem and another user confirmed the same behavior on his machine: http://pastie.caboo.se/65417 Haven't tried it with *2925.10* yet. Also, is there a way to get more verbose info about what calls are causing the "configuration file syntax error" errors? Thanks. virt-install How large would you like the disk () to be (in gigabytes)? 4 ERROR: Must provide a file, not a directory for the disk What would you like to use as the disk (path)? /xen/images/x6.img Would you like to enable graphics support? (yes or no) no What is the install location? http://mirror.anl.gov/pub/fedora-linux-core/test/6.93/Fedora/i386/os/ Starting install... libvir: Xen Daemon error : GET operation failed: libvir: error : configuration file syntax error: expecting a name libvir: error : configuration file syntax error: expecting a name libvir: error : configuration file syntax error: expecting a name Retrieving Fedora... 276 kB 00:01 Retrieving vmlinuz... 100% |=========================| 2.1 MB 00:16 Retrieving initrd.img... 100% |=========================| 5.4 MB 00:28 libvir: Xen Daemon error : GET operation failed: libvir: error : configuration file syntax error: expecting a name libvir: error : configuration file syntax error: expecting a name libvir: error : configuration file syntax error: expecting a name Creating domain... 0 B 00:06 Linux version 2.6.20-2925.5.fc7xen (brewbuilder(a)ls20-bc1-14.build.redhat.com) (gcc version 4.1.2 20070317 (Red Hat 4.1.2-5)) #1 SMP Thu Mar 22 13:51:38 EDT 2007 BIOS-provided physical RAM map: sanitize start sanitize bail 0 copy_e820_map() start: 0000000000000000 size: 0000000020800000 end: 0000000020800000 type: 1 Xen: 0000000000000000 - 0000000020800000 (usable) 0MB HIGHMEM available. 520MB LOWMEM available. Using x86 segment limits to approximate NX protection Zone PFN ranges: DMA 0 -> 133120 Normal 133120 -> 133120 HighMem 133120 -> 133120 early_node_map[1] active PFN ranges 0: 0 -> 133120 ACPI in unprivileged domain disabled Built 1 zonelists. Total pages: 132080 Kernel command line: method=http://mirror.anl.gov/pub/fedora-linux-core/test/6.93/Fedora/i386/os/ Enabling fast FPU save and restore... done. Enabling unmasked SIMD FPU exception support... done. Initializing CPU#0 CPU 0 irqstacks, hard=c135f000 soft=c133f000 PID hash table entries: 4096 (order: 12, 16384 bytes) Xen reported: 1694.994 MHz processor. Console: colour dummy device 80x25 Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo Molnar ... MAX_LOCKDEP_SUBCLASSES: 8 ... MAX_LOCK_DEPTH: 30 ... MAX_LOCKDEP_KEYS: 2048 ... CLASSHASH_SIZE: 1024 ... MAX_LOCKDEP_ENTRIES: 8192 ... MAX_LOCKDEP_CHAINS: 16384 ... CHAINHASH_SIZE: 8192 memory used by lock dependency info: 1064 kB per task-struct memory footprint: 1200 bytes Dentry cache hash table entries: 131072 (order: 7, 524288 bytes) Inode-cache hash table entries: 65536 (order: 6, 262144 bytes) Software IO TLB disabled vmalloc area: e1000000-f4ffe000, maxmem 2d7fe000 Memory: 503936k/532480k available (2030k kernel code, 19948k reserved, 1079k data, 180k init, 0k highmem) virtual kernel memory layout: fixmap : 0xf5315000 - 0xf57fe000 (5028 kB) pkmap : 0xf5000000 - 0xf5200000 (2048 kB) vmalloc : 0xe1000000 - 0xf4ffe000 ( 319 MB) lowmem : 0xc0000000 - 0xe0800000 ( 520 MB) .init : 0xc130e000 - 0xc133b000 ( 180 kB) .data : 0xc11fb9d9 - 0xc1309714 (1079 kB) .text : 0xc1000000 - 0xc11fb9d9 (2030 kB) Checking if this processor honours the WP bit even in supervisor mode... Ok. Calibrating delay using timer specific routine.. 4262.67 BogoMIPS (lpj=8525343) Security Framework v1.0.0 initialized SELinux: Initializing. SELinux: Starting in permissive mode selinux_register_security: Registering secondary module capability Capability LSM initialized as secondary Mount-cache hash table entries: 512 CPU: Trace cache: 12K uops, L1 D cache: 8K CPU: L2 cache: 256K Checking 'hlt' instruction... OK. SMP alternatives: switching to UP code Freeing SMP alternatives: 11k freed Brought up 1 CPUs Grant table initialized NET: Registered protocol family 16 Brought up 1 CPUs PCI: Fatal: No config space access function found PCI: setting up Xen PCI frontend stub Setting up standard PCI resources ACPI: Interpreter disabled. Linux Plug and Play Support v0.97 (c) Adam Belay pnp: PnP ACPI: disabled xen_mem: Initialising balloon driver. usbcore: registered new interface driver usbfs usbcore: registered new interface driver hub usbcore: registered new device driver usb PCI: System does not support PCI PCI: System does not support PCI NetLabel: Initializing NetLabel: domain hash size = 128 NetLabel: protocols = UNLABELED CIPSOv4 NetLabel: unlabeled traffic allowed by default NET: Registered protocol family 2 IP route cache hash table entries: 32768 (order: 5, 131072 bytes) TCP established hash table entries: 131072 (order: 10, 4194304 bytes) TCP bind hash table entries: 65536 (order: 9, 2097152 bytes) TCP: Hash tables configured (established 131072 bind 65536) TCP reno registered checking if image is initramfs... it is Freeing initrd memory: 7256k freed IA-32 Microcode Update Driver: v1.14-xen <tigran(a)veritas.com> audit: initializing netlink socket (disabled) audit(1180379657.981:1): initialized VFS: Disk quotas dquot_6.5.1 Dquot-cache hash table entries: 1024 (order 0, 4096 bytes) SELinux: Registering netfilter hooks io scheduler noop registered io scheduler anticipatory registered io scheduler deadline registered io scheduler cfq registered (default) pci_hotplug: PCI Hot Plug PCI Core version: 0.5 BUG: at kernel/fork.c:994 copy_process() [<c1005d9a>] show_trace_log_lvl+0x1a/0x2f [<c1006343>] show_trace+0x12/0x14 [<c10063be>] dump_stack+0x16/0x18 [<c101d044>] copy_process+0x195/0x1245 [<c101e144>] do_fork+0x50/0x117 [<c1003351>] kernel_thread+0x8e/0x96 [<c102c701>] __call_usermodehelper+0x2d/0x46 [<c102cd4f>] run_workqueue+0x89/0x145 [<c102d711>] worker_thread+0xd5/0x102 [<c102ff27>] kthread+0xb3/0xdc [<c10058db>] kernel_thread_helper+0x7/0x10 ======================= rtc: IRQ 8 is not free. Non-volatile memory driver v1.2 Linux agpgart interface v0.101 (c) Dave Jones RAMDISK driver initialized: 16 RAM disks of 16384K size 4096 blocksize input: Macintosh mouse button emulation as /class/input/input0 Xen virtual console successfully installed as xvc0 Event-channel device installed. usbcore: registered new interface driver libusual usbcore: registered new interface driver hiddev usbcore: registered new interface driver usbhid drivers/usb/input/hid-core.c: v2.6:USB HID core driver PNP: No PS/2 controller found. Probing ports directly. i8042.c: No controller found. mice: PS/2 mouse device common for all mice TCP bic registered Initializing XFRM netlink socket NET: Registered protocol family 1 NET: Registered protocol family 17 Using IPI No-Shortcut mode XENBUS: Device with no driver: device/vbd/51712 XENBUS: Device with no driver: device/vif/0 Freeing unused kernel memory: 180k freed Write protecting the kernel read-only data: 762k ^[Domain installation still in progress. You can reconnect

2 1

[libvirt] [PATCH] Fix python error reporting for some storage operations
by Cole Robinson 07 Mar '25

07 Mar '25

In the python bindings, all vir* classes expect to be passed a virConnect object when instantiated. Before the storage stuff, these classes were only instantiated in virConnect methods, so the generator is hardcoded to pass 'self' as the connection instance to these classes. Problem is there are some methods that return pool or vol instances which aren't called from virConnect: you can lookup a storage volume's associated pool, and can lookup volumes from a pool. In these cases passing 'self' doesn't give the vir* instance a connection, so when it comes time to raise an exception crap hits the fan. Rather than rework the generator to accomodate this edge case, I just fixed the init functions for virStorage* to pull the associated connection out of the passed value if it's not a virConnect instance. Thanks, Cole diff --git a/python/generator.py b/python/generator.py index 01a17da..c706b19 100755 --- a/python/generator.py +++ b/python/generator.py @@ -962,8 +962,12 @@ def buildWrappers(): list = reference_keepers[classname] for ref in list: classes.write(" self.%s = None\n" % ref[1]) - if classname in [ "virDomain", "virNetwork", "virStoragePool", "virStorageVol" ]: + if classname in [ "virDomain", "virNetwork" ]: classes.write(" self._conn = conn\n") + elif classname in [ "virStorageVol", "virStoragePool" ]: + classes.write(" self._conn = conn\n" + \ + " if not isinstance(conn, virConnect):\n" + \ + " self._conn = conn._conn\n") classes.write(" if _obj != None:self._o = _obj;return\n") classes.write(" self._o = None\n\n"); destruct=None

4 3

[libvirt] [PATCH] web docs -- macvtap mode explanation
by Stefan Berger 27 Oct '23

27 Oct '23

This adds more information about the different macvtap device modes. Regards, Stefan

3 2

[libvirt] Supporting vhost-net and macvtap in libvirt for QEMU
by Anthony Liguori 27 Oct '23

27 Oct '23

Disclaimer: I am neither an SR-IOV nor a vhost-net expert, but I've CC'd people that are who can throw tomatoes at me for getting bits wrong :-) I wanted to start a discussion about supporting vhost-net in libvirt. vhost-net has not yet been merged into qemu but I expect it will be soon so it's a good time to start this discussion. There are two modes worth supporting for vhost-net in libvirt. The first mode is where vhost-net backs to a tun/tap device. This is behaves in very much the same way that -net tap behaves in qemu today. Basically, the difference is that the virtio backend is in the kernel instead of in qemu so there should be some performance improvement. Current, libvirt invokes qemu with -net tap,fd=X where X is an already open fd to a tun/tap device. I suspect that after we merge vhost-net, libvirt could support vhost-net in this mode by just doing -net vhost,fd=X. I think the only real question for libvirt is whether to provide a user visible switch to use vhost or to just always use vhost when it's available and it makes sense. Personally, I think the later makes sense. The more interesting invocation of vhost-net though is one where the vhost-net device backs directly to a physical network card. In this mode, vhost should get considerably better performance than the current implementation. I don't know the syntax yet, but I think it's reasonable to assume that it will look something like -net tap,dev=eth0. The effect will be that eth0 is dedicated to the guest. On most modern systems, there is a small number of network devices so this model is not all that useful except when dealing with SR-IOV adapters. In that case, each physical device can be exposed as many virtual devices (VFs). There are a few restrictions here though. The biggest is that currently, you can only change the number of VFs by reloading a kernel module so it's really a parameter that must be set at startup time. I think there are a few ways libvirt could support vhost-net in this second mode. The simplest would be to introduce a new tag similar to <source network='br0'>. In fact, if you probed the device type for the network parameter, you could probably do something like <source network='eth0'> and have it Just Work. Another model would be to have libvirt see an SR-IOV adapter as a network pool whereas it handled all of the VF management. Considering how inflexible SR-IOV is today, I'm not sure whether this is the best model. Has anyone put any more thought into this problem or how this should be modeled in libvirt? Michael, could you share your current thinking for -net syntax? -- Regards, Anthony Liguori

8 26

[libvirt] [PATCH 0/4] Multiple problems with saving to block devices
by Daniel P. Berrange 24 Mar '13

24 Mar '13

This patch series makes it possible to save to a block device, instead of a plain file. There were multiple problems - WHen save failed, we might de-reference a NULL pointer - When save failed, we unlinked the device node !! - The approach of using >> to append, doesn't work with block devices - CGroups was blocking QEMU access to the block device when enabled One remaining problem is not in libvirt, but rather QEMU. The QEMU exec: based migration often fails to detect failure of the command and will thus hang forever attempting a migration that'll never succeed! Fortunately you can now work around this in libvirt using the virsh domjobabort command

4 21

[libvirt] I need help for use virDomainInterfaceStats
by Фёдор Пранович 04 Apr '12

04 Apr '12

Hi I want use the virDomainInterfaceStats for get statistic of domain, but I don't now how get path parametr. Please help me! Thanks.

4 3

[libvirt] qemu-namespace handling?
by Philipp Hahn 20 Oct '11

20 Oct '11

Hello, some time ago I hand to manipulate the domain XML description using Pythons Elemtree XML implementation, which had problems generating the right format for libvirt: elemtree just supports adding Qname elements (that is "{http://libvirt.org/schemas/domain/qemu/1.0}commandline") which internally would create a temporary binding of this namespace to the "ns0" Prefix. My work-around for Elemtree was the add the name-space mapping for "qemu" to "http://libvirt.org/schemas/domain/qemu/1.0" to ETs internal mapping table and add an "xmlns:qemu" attribute by hand: ET._namespace_map[QEMU_URI] = 'qemu' domain.attrib['xmlns:qemu'] = QEMU_URI libvirt on the other hand expects the prefix to be "qemu" and only checks, that this prefix is bound to the URI mentioned above at the root node). The following examples would be XML valid, but are not accepted by libvirt: <domain>... <qemu:commandline xmlns:qemu="http://libvirt.org/schemas/domain/qemu/1.0"> ...</qemu:commandline> </domain> <domain xmlns:ns0="http://libvirt.org/schemas/domain/qemu/1.0">... <ns0:commandline> ...</ns0:commandline> </domain> The following (esoteric) example might be wrongly accepted by libvirt (untested): <domain xmlns:qemu="http://libvirt.org/schemas/domain/qemu/1.0"> <qemu:commandline xmlns:qemu="urn:foo"> ...</qemu:commandline> </domain> I don't know if this is worth fixing, but I still encountered the first two problems myself and had to spend some time to detecting what I did wrong. So at least I want to share my finding with others, so they don't do the same mistake. Sincerely Philipp Hahn -- Philipp Hahn Open Source Software Engineer hahn(a)univention.de Univention GmbH Linux for Your Business fon: +49 421 22 232- 0 Mary-Somerville-Str.1 D-28359 Bremen fax: +49 421 22 232-99 http://www.univention.de/

3 7

[libvirt] LPC2011 Virtualization Micro Conf
by Jes Sorensen 27 Sep '11

27 Sep '11

Hi, With the success of last year's Virtualization micro-conference track at Linux Plumbers 2010, I have accepted to organize a similar track for Linux Plumbers 2011 in Santa Rosa. Please see the official Linux Plumbers 2011 website for full details about the conference: http://www.linuxplumbersconf.org/2011/ The Linux Plumbers 2011 Virtualization track is focusing on general free software Linux Virtualization. It is not reserved for a specific hypervisor, but will focus on general virtualization issues and in particular collaboration amongst projects. This would include KVM, Xen, QEMU, containers etc. Deadline: --------- The deadline for submissions is April 30th. Please visit the following link to submit your proposal: http://www.linuxplumbersconf.org/2011/ocw/events/LPC2011MC/proposals Example topics: --------------- - Kernel and Hypervisor KVM/QEMU/Xen interaction - QEMU integration, sharing of code between the different projects - IO Performance and scalability - Live Migration - Managing and supporting enterprise storage - Support for new hardware features, and/or provide guest access to these features. - Guest agents - Virtualization management tools, libvirt, etc. - Desktop integration - Consumer Electronics device emulation - Custom platform configuration and coordination with the kernel Audience: --------- Virtualization hypervisor developers, developers of virtualization management tools and applications, embedded virtualization developers, vendors and others. Best regards, Jes

1 1

[libvirt] libvirt(-java): virDomainMigrateSetMaxDowntime
by Thomas Treutner 15 Sep '11

15 Sep '11

Hi, I'm facing some troubles with virDomainMigrate & virDomainMigrateSetMaxDowntime. The core problem is that KVM's default value for the maximum allowed downtime is 30ms (max_downtime in migration.c, it's nanoseconds there; 0.12.3) which is too low for my VMs when they're busy (~50% CPU util and above). Migrations then take literally forever, I had to abort them after 15 minutes or so. I'm using GBit Ethernet, so plenty bandwidth should be available. Increasing the allowed downtime to 50ms seems to help, but I have not tested situations where the VM is completely utilized. Anyways, the default value is too low for me, so I tried virDomainMigrateSetMaxDowntime resp. the Java wrapper function. Here I'm facing a problem I can overcome only with a quite crude hack: org.libvirt.Domain.migrate(..) blocks until the migration is done, which is of course reasonable. So I tried calling migrateSetMaxDowntime(..) before migrating, causing an error: "Requested operation is not valid: domain is not being migrated" This tells me that calling migrateSetMaxDowntime is only allowed during migrations. As I'm migrating VMs automatically and without any user intervention I'd need to create some glue code that runs in an extra thread, waiting "some time" hoping that the migration was kicked off in the main thread yet and then calling migrateSetMaxDowntime. I'd like to avoid such quirks in the long run, if possible. So my question: Would it be possible to extend the migrate() method resp. virDomainMigrate() function with an optional maxDowntime parameter that is passed down as QEMU_JOB_SIGNAL_MIGRATE_DOWNTIME so that qemuDomainWaitForMigrationComplete would set the value? Or are there easier ways? Thanks and regards, -t

3 5

Re: [libvirt] migration of vnlink VMs
by Oved Ourfalli 05 Sep '11

05 Sep '11

----- Original Message ----- > From: "Laine Stump" <lstump(a)redhat.com> > To: "Oved Ourfalli" <ovedo(a)redhat.com> > Cc: "Ayal Baron" <abaron(a)redhat.com>, "Barak Azulay" <bazulay(a)redhat.com>, "Shahar Havivi" <shaharh(a)redhat.com>, > "Itamar Heim" <iheim(a)redhat.com>, "Dan Kenigsberg" <danken(a)redhat.com> > Sent: Thursday, April 28, 2011 10:20:35 AM > Subject: Re: migration of vnlink VMs > Oved, > > Would it be okay to repost this message to the thread on libvir-list > so > that other parties can add their thoughts? > Of course. I'm sending my answer to the libvirt list. > On 04/27/2011 09:58 AM, Oved Ourfalli wrote: > > Laine, hello. > > > > We read your proposal for abstraction of guest<--> host network > > connection in libvirt. > > > > You has an open issue there regarding the vepa/vnlink attributes: > > "3) What about the parameters in the<virtualport> element that are > > currently used by vepa/vnlink. Do those belong with the host, or > > with the guest?" > > > > The parameters for the virtualport element should be on the guest, > > and not the host, because a specific interface can run multiple > > profiles, > > Are you talking about host interface or guest interface? If you mean > that multiple different profiles can be used when connecting to a > particular switch - as long as there are only a few different > profiles, > rather than each guest having its own unique profile, then it still > seems better to have the port profile live with the network definition > (and just define multiple networks, one for each port profile). > The profile names can be changed regularly, so it looks like it will be better to put them in the guest level, so that the network host file won't have to be changed on all hosts once something has changed in the profiles. Also, you will have a duplication of data, writing all the profile name on all the hosts that are connected to the vn-link/vepa switch. > > > so it will be a mistake to define a profile to be interface > > specific on the host. Moreover, putting it in the guest level will > > enable us in the future (if supported by libvirt/qemu) to migrate > > a vm from a host with vepa/vnlink interfaces, to another host with > > a bridge, for example. > > It seems to me like doing exactly the opposite would make it easier to > migrate to a host that used a different kind of switching (from vepa > to > vnlink, or from a bridged interface to vepa, etc), since the port > profile required for a particular host's network would be at the host > waiting to be used. You are right, but we would want to have the option to prevent that from happening in case we wouldn't want to allow it. We can make the ability to migrate between different network types configurable, and we would like an easy way to tell libvirt - "please allow/don't allow it". > > > So, in the networks at the host level you will have: > > <network type='direct'> > > <name>red-network</name> > > <source mode='vepa'> > > <pool> > > <interface> > > <name>eth0</name> > > ..... > > </interface> > > <interface> > > <name>eth4</name> > > ..... > > </interface> > > <interface> > > <name>eth18</name> > > ..... > > </interface> > > </pool> > > </source> > > </network> > > > > And in the guest you will have (for vepa): > > <interface type='network'> > > <source network='red-network'/> > > <virtualport type="802.1Qbg"> > > <parameters managerid="11" typeid="1193047" typeidversion="2" > > instanceid="09b11c53-8b5c-4eeb-8f00-d84eaa0aaa4f"/> > > </virtualport> > > </interface> > > > > Or (for vnlink): > > <interface type='network'> > > <source network='red-network'/> > > <virtualport type="802.1Qbh"> > > <parameters profile_name="profile1"/> > > </virtualport> > > </interface> > > This illustrates the problem I was wondering about - in your example > it > would not be possible for the guest to migrate from the host using a > vepa switch to the host using a vnlink switch (and it would be > possible You are right. When trying to migrate between vepa and vnlink there will be missing attributes in each in case we leave it on the host. > to migrate to a host using a standard bridge only if the virtualport > element was ignored). If the virtualport element lived with the > network > definition of red-network on each host, it could be migrated without > problem. > > The only problematic thing would be if any of the attributes within > <parameters> was unique for each guest (I don't know anything about > the > individual attributes, but "instanceid" sounds like it might be > different for each guest). > > > Then, when migrating from a vepa/vnlink host to another vepa/vnlink > > host containing red-network, the profile attributes will be > > available at the guest domain xml. > > In case the target host has a red-network, which isn't vepa/vnlink, > > we want to be able to choose whether to make the use of the profile > > attributes optional (i.e., libvirt won't fail in case of migrating > > to a network of another type), or mandatory (i.e., libvirt will fail > > in case of migration to a non-vepa/vnlink network). > > > > We have something similar in CPU flags: > > <cpu match="exact"> > > <model>qemu64</model> > > <topology sockets="S" cores="C" threads="T"/> > > <feature policy="require/optional/disable......" > > name="sse2"/> > > </cpu> > > In this analogy, does "CPU flags" == "mode (vepa/vnlink/bridge)" or > does > "CPU flags" == "virtualport parameters" ? It seems like what you're > wanting can be satisfied by simply not defining "red-network" on the > hosts that don't have the proper networking setup available (maybe > what > you *really* want to call it is "red-vnlink-network"). What I meant to say in that is that we would like to have the ability to say if an attribute must me used, or not. The issues you mention are indeed interesting. I'm cc-ing libvirt-list to see what other people think. Putting it on the guest will indeed make it problematic to migrate between networks that need different parameters (vnlink/vepa for example). Oved

7 11