March 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

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[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

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[libvirt] [PATCH] web docs -- macvtap mode explanation
by Stefan Berger 26 Oct '23

26 Oct '23

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

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[libvirt] Supporting vhost-net and macvtap in libvirt for QEMU
by Anthony Liguori 26 Oct '23

26 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

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[libvirt] [PATCH 0/4] Multiple problems with saving to block devices
by Daniel P. Berrange 23 Mar '13

23 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

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[libvirt] I need help for use virDomainInterfaceStats
by Фёдор Пранович 03 Apr '12

03 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.

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[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

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[libvirt] snapshots += domain description?
by Philipp Hahn 15 Aug '11

15 Aug '11

Hello, I just encountered a problem with the current snapshot implementation for qemu/kvm: To revert back to a snapshot, the domain description must closely match the domain description when the snapshot was created. If the ram-size doesn't match or the VM now contains fewer CPUs or contains additional disks, kvm will either not load the snapshot or the machine will be broken afterwarts. Is this a known problem? Without looking into the implementation details I think saving the full domain description instead of just a reference to the domain uuid as part of the snapshot description would work better. Or am I supposed to save the domain description myself in addition the the data saved in /var/lib/libvirt/qemu/snapshot/$DOMAIN_NAME/$SNAPSHOT_NAME.xml. I think this is very important feature, because when you - for example - notice that you need additional disk space and would like to include an additional block device, this is your ideal time to take a snapshot you can revert to when you do something wrong. Looking at VMware I see that reverting a VM there will not only revert the disks and ram back to the saved state, but also the description including name, ram size, etc. Any comment or advise is appreciated. 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 28359 Bremen fax: +49 421 22 232-99 http://www.univention.de

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[libvirt] [PATCH] qemu: Fix -chardev udp if parameters are omitted
by Cole Robinson 10 Aug '11

10 Aug '11

The following XML: <serial type='udp'> <source mode='connect' service='9999'/> </serial> is accepted by domain_conf.c but maps to the qemu command line: -chardev udp,host=127.0.0.1,port=2222,localaddr=(null),localport=(null) qemu can cope with everything omitting except the connection port, which seems to also be the intent of domain_conf validation, so let's not generate bogus command lines for that case. Additionally, tweak the qemu cli parsing to handle omitted host parameters for -serial udp --- src/qemu/qemu_command.c | 48 +++++++++++--------- .../qemuxml2argv-serial-udp-chardev.args | 6 ++- .../qemuxml2argv-serial-udp-chardev.xml | 4 ++ .../qemuxml2argvdata/qemuxml2argv-serial-udp.args | 2 +- tests/qemuxml2argvdata/qemuxml2argv-serial-udp.xml | 4 ++ 5 files changed, 39 insertions(+), 25 deletions(-) diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c index c9b9850..231d7c3 100644 --- a/src/qemu/qemu_command.c +++ b/src/qemu/qemu_command.c @@ -2119,14 +2119,17 @@ qemuBuildChrChardevStr(virDomainChrSourceDefPtr dev, const char *alias, break; case VIR_DOMAIN_CHR_TYPE_UDP: - virBufferVSprintf(&buf, - "udp,id=char%s,host=%s,port=%s,localaddr=%s," - "localport=%s", + virBufferVSprintf(&buf, "udp,id=char%s,port=%s", alias, - dev->data.udp.connectHost, - dev->data.udp.connectService, - dev->data.udp.bindHost, - dev->data.udp.bindService); + dev->data.udp.connectService); + + if (dev->data.udp.connectHost) + virBufferVSprintf(&buf, ",host=%s", dev->data.udp.connectHost); + if (dev->data.udp.bindHost) + virBufferVSprintf(&buf, ",localaddr=%s", dev->data.udp.bindHost); + if (dev->data.udp.bindService) + virBufferVSprintf(&buf, ",localport=%s", + dev->data.udp.bindService); break; case VIR_DOMAIN_CHR_TYPE_TCP: @@ -2216,11 +2219,13 @@ qemuBuildChrArgStr(virDomainChrSourceDefPtr dev, const char *prefix) break; case VIR_DOMAIN_CHR_TYPE_UDP: - virBufferVSprintf(&buf, "udp:%s:%s@%s:%s", - dev->data.udp.connectHost, - dev->data.udp.connectService, - dev->data.udp.bindHost, - dev->data.udp.bindService); + virBufferVSprintf(&buf, "udp:%s:%s", + dev->data.udp.connectHost ?: "", + dev->data.udp.connectService); + if (dev->data.udp.bindService) + virBufferVSprintf(&buf, "@%s:%s", + dev->data.udp.bindHost ?: "", + dev->data.udp.bindService); break; case VIR_DOMAIN_CHR_TYPE_TCP: @@ -5302,13 +5307,12 @@ qemuParseCommandLineChr(const char *val) host2 = svc1 ? strchr(svc1, '@') : NULL; svc2 = host2 ? strchr(host2, ':') : NULL; - if (svc1) + if (svc1 && (svc1 != val)) { def->source.data.udp.connectHost = strndup(val, svc1-val); - else - def->source.data.udp.connectHost = strdup(val); - if (!def->source.data.udp.connectHost) - goto no_memory; + if (!def->source.data.udp.connectHost) + goto no_memory; + } if (svc1) { svc1++; @@ -5323,14 +5327,14 @@ qemuParseCommandLineChr(const char *val) if (host2) { host2++; - if (svc2) + if (svc2 && (svc2 != host2)) { def->source.data.udp.bindHost = strndup(host2, svc2-host2); - else - def->source.data.udp.bindHost = strdup(host2); - if (!def->source.data.udp.bindHost) - goto no_memory; + if (!def->source.data.udp.bindHost) + goto no_memory; + } } + if (svc2) { svc2++; def->source.data.udp.bindService = strdup(svc2); diff --git a/tests/qemuxml2argvdata/qemuxml2argv-serial-udp-chardev.args b/tests/qemuxml2argvdata/qemuxml2argv-serial-udp-chardev.args index 7525110..8c6a6d5 100644 --- a/tests/qemuxml2argvdata/qemuxml2argv-serial-udp-chardev.args +++ b/tests/qemuxml2argvdata/qemuxml2argv-serial-udp-chardev.args @@ -2,6 +2,8 @@ LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test /usr/bin/qemu -S -M \ pc -m 214 -smp 1 -nographic -nodefconfig -nodefaults -chardev socket,\ id=charmonitor,path=/tmp/test-monitor,server,nowait -mon chardev=charmonitor,\ id=monitor,mode=readline -no-acpi -boot c -hda /dev/HostVG/QEMUGuest1 -chardev \ -udp,id=charserial0,host=127.0.0.1,port=9998,localaddr=127.0.0.1,localport=9999 \ --device isa-serial,chardev=charserial0,id=serial0 -usb -device \ +udp,id=charserial0,port=9998,host=127.0.0.1,localaddr=127.0.0.1,localport=9999 \ +-device isa-serial,chardev=charserial0,id=serial0 \ +-chardev udp,id=charserial1,port=9999 \ +-device isa-serial,chardev=charserial1,id=serial1 -usb -device \ virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x2 diff --git a/tests/qemuxml2argvdata/qemuxml2argv-serial-udp-chardev.xml b/tests/qemuxml2argvdata/qemuxml2argv-serial-udp-chardev.xml index 12622d4..9627c67 100644 --- a/tests/qemuxml2argvdata/qemuxml2argv-serial-udp-chardev.xml +++ b/tests/qemuxml2argvdata/qemuxml2argv-serial-udp-chardev.xml @@ -25,6 +25,10 @@ <source mode='connect' host='127.0.0.1' service='9998'/> <target port='0'/> </serial> + <serial type='udp'> + <source mode='connect' service='9999'/> + <target port='1'/> + </serial> <console type='udp'> <source mode='bind' host='127.0.0.1' service='9999'/> <source mode='connect' host='127.0.0.1' service='9998'/> diff --git a/tests/qemuxml2argvdata/qemuxml2argv-serial-udp.args b/tests/qemuxml2argvdata/qemuxml2argv-serial-udp.args index 53c69bc..cf25fe0 100644 --- a/tests/qemuxml2argvdata/qemuxml2argv-serial-udp.args +++ b/tests/qemuxml2argvdata/qemuxml2argv-serial-udp.args @@ -1,4 +1,4 @@ LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test /usr/bin/qemu -S -M \ pc -m 214 -smp 1 -nographic -monitor unix:/tmp/test-monitor,server,nowait \ -no-acpi -boot c -hda /dev/HostVG/QEMUGuest1 -net none -serial \ -udp:127.0.0.1:9998@127.0.0.1:9999 -parallel none -usb +udp:127.0.0.1:9998@127.0.0.1:9999 -serial udp::9999 -parallel none -usb diff --git a/tests/qemuxml2argvdata/qemuxml2argv-serial-udp.xml b/tests/qemuxml2argvdata/qemuxml2argv-serial-udp.xml index 8697f5a..f606ea4 100644 --- a/tests/qemuxml2argvdata/qemuxml2argv-serial-udp.xml +++ b/tests/qemuxml2argvdata/qemuxml2argv-serial-udp.xml @@ -25,6 +25,10 @@ <source mode='connect' host='127.0.0.1' service='9998'/> <target port='0'/> </serial> + <serial type='udp'> + <source mode='connect' service='9999'/> + <target port='1'/> + </serial> <console type='udp'> <source mode='bind' host='127.0.0.1' service='9999'/> <source mode='connect' host='127.0.0.1' service='9998'/> -- 1.7.4

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[libvirt] (how much) support for kqemu domain
by John Lumby 06 Jun '11

06 Jun '11

I am wondering about the extent to which "old" qemu-0.11.1 and kqemu-1.4.0 are supported by virt-manager. I see I can specify --virt-type=kqemu on virt-install and it remembers domain type='kqemu', and does things such as refusing to start the vm if the kqemu kernel mod not loaded, but it seems it does not tack on the -enable-kqemu -kernel-kqemu options on to the qemu command line. There is really not much point in trying to start a qemu-based vm with neither hardware kvm nor kqemu ... I can work around it with an override script to intercept the qemu command, but does anyone think virt-manager ought to do this for me? John Lumby _________________________________________________________________

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