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[libvirt-users] vvirsh memtune
by Zvi Dubitzky 24 Apr '11

24 Apr '11

Hi Does anybody use the 'virsh memtune' command and can he say what combination of libvirt version and libcgroup does he use thanks Zvi Dubitzky Email:dubi@il.ibm.com

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[libvirt-users] 2 hosts, mirrored VM storage, avoiding conflicting VM instances
by Whit Blauvelt 24 Apr '11

24 Apr '11

Hi, Using libvirt for KVM, experimenting with live migration with the VM on storage shared in a mirrored GlusterFS or an active-active DRBD setup where QEMU/KVM runs on the hosts on both sides of the mirror, the live migration works great. What concerns me is finding a way if possible to prevent a situation where a particular VM is running on both hosts at once. Is there any way within libvirt in this sort of setup to start a VM on mirrored storage from a KVM host on one side of the mirror _only if_ the same VM isn't already running on the other side of the mirror? In a scripting context I can see how to do that check before starting, but not how to prevent virsh or virt-manager from being used to create this bad condition when they're being used directly. Is there some way to set up protection from this within virsh and virt-manager? Or am I into feature request territory? Or is there some other layer at which this can be accomplished? In active-passive DRBD this wouldn't be a danger, since only the active system can see the storage to start the VM. But that wouldn't support live migration. Part of the danger can be avoided by using stonith in failover, but it would be nice to find a more fine-grained, subtle approach. Best, Whit

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[libvirt-users] PCI Pass through of atheros card
by Varun Ganesh 24 Apr '11

24 Apr '11

Hi, I am trying to make a PCI passthrough of the atheros card to a VM running over KVM. am following the steps given at http://docs.fedoraproject.org/en-US/Fedora/13/html/Virtualization_Guide/sec…. but am getting the following errors, 1. Error starting domain: operation failed: failed to retrieve chardev info in qemu with 'info chaqdev' 2. Details: 3. Error starting domain: operation failed: failed to retrieve chardev info in qemu with 'info chaqdev' 4. 5. Traceback (most recent call last): 6. File "/usr/share/virt-manager/virtManager/asyncjob.py", line 45, in cb_wrapper 7. callback(asyncjob, *args, **kwargs) 8. File "/usr/share/virt-manager/virtManager/engine.py", line 959, in asyncfunc 9. vm.startup() 10. File "/usr/share/virt-manager/virtManager/domain.py", line 1114, in startup 11. self._backend.create() 12. File "/usr/lib/python2.7/site-packages/libvirt.py", line 333, in create 13. if ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self) 14. libvirtError: operation failed: failed to retrieve chardev info in qemu with 'info chaqdev' I am using a Dell Optiplex XE system which has VT-d enabled and Atheros AR5001X+ Wireless Network Adapter. How do i rectify this. Thanks, sincerely, Varun Ganesh

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[libvirt-users] domain not present after shutdown
by David White 23 Apr '11

23 Apr '11

I hope this is simple I have one kvm host that lists all my domains even after shut down. 'virsh list --all' shows machines in 'running' and 'shut off' states. If I copy those over to another machine and it only shows the virt machines in running state. vmhost2:~$ virsh list --all Id Name State ---------------------------------- 4 mybox4 running vmhost2:~$ virsh version Compiled against library: libvir 0.8.3 Using library: libvir 0.8.3 Using API: QEMU 0.8.3 Running hypervisor: QEMU 0.12.5 vmhost1:~$ virsh list --all Id Name State ---------------------------------- - mybox3 shut off 2 mybox4 running vmhost1:~$ virsh version Compiled against library: libvir 0.7.5 Using library: libvir 0.7.5 Using API: QEMU 0.7.5 Running hypervisor: QEMU 0.12.3 question -- why doesn't mybox3 show up on vmhost2? where should I start looking? hope this isn't too open ended...

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[libvirt-users] [PATCHv11 0/6] libvirt/qemu - persistent modification of devices
by KAMEZAWA Hiroyuki 22 Apr '11

22 Apr '11

Here is v11. Fixed comments/bugs and updated against the latest libvirt.git. Changes v10->v11: - fixed comments on each patches - fixed cgroup handling in patch 3. - fixed MODIFY_CURRENT handling in patch 4. most of diff comes from refactoring qemu/qemu_driver.c -- conf/domain_conf.c | 40 ++ conf/domain_conf.h | 5 libvirt_private.syms | 3 qemu/qemu_driver.c | 727 +++++++++++++++++++++++++++++++-------------------- 4 files changed, 500 insertions(+), 275 deletions(-) Thanks, -Kame

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[libvirt-users] No IOMMU found. Unable to assign device
by Marco van Beek 22 Apr '11

22 Apr '11

Hi, I am playing around with PCI passthrough and came across some posts that said you could not do PCI passthrough unless you had IOMMU hardware. which it would appear I don't Is this the case? Am I flogging a dead horse? Thanks, Marco -- Marco van Beek ========================================== Supporting Role Ltd. Grove Park Studios, 188-192 Sutton Court Rd, London, W4 3HR ========================================== T: 0870 757 2824 F: 0870 757 2826 M: 0788 770 3604 E: mvanbeek(a)supporting-role.co.uk W: http://www.supporting-role.co.uk/ ========================================== Company Registered in England No. 03658568 ==========================================

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[libvirt-users] kvm virtual server boot order
by Yee Ja 21 Apr '11

21 Apr '11

The boot order issue http://osdir.com/ml/libvir-list/2009-08/msg00398.html resolved with the code changes specified by http://www.redhat.com/archives/libvir-list/2009-August/msg00340.html seems to suggest that hard disks, cdroms, floppy devices (since they are all disks) are ordered primarily by virtual bus type as encountered in the domain xml. This indicates that there can exist a conflict between the primary and secondary boot device types. Given the scenario where the disks of a virtual server are defined in the following order harddisk hda harddisk vda cdrom vdb cdrom hdb Boot device type is crdom. Which cdrom device will be boot attempted? >From the above links, I'm guessing that hdb will be boot attempted. Is this the actual behavior? Thanks, Yee -- yja(a)us.ibm.com * 512-286-6793 T/L 363 * Systems Management Software Development * Austin, TX

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[libvirt-users] Undefined interfaces?
by Alex 20 Apr '11

20 Apr '11

Hi, I have a working fc14 install with a few virtual interfaces set up, and just noticed the following in messages: Apr 18 13:07:43 fc14 libvirtd: 13:07:43.155: error : interfaceGetXMLDesc:355 : internal error could not get interface XML description (netcf: NETLINK socket operation failed - couldn't find ifindex for interface `br0:0`) Apr 18 13:07:43 fc14 libvirtd: 13:07:43.165: error : interfaceGetXMLDesc:355 : internal error could not get interface XML description (netcf: NETLINK socket operation failed - couldn't find ifindex for interface `eth0:0`) Apr 18 13:07:43 fc14 libvirtd: 13:07:43.175: error : interfaceGetXMLDesc:355 : internal error could not get interface XML description (netcf: NETLINK socket operation failed - couldn't find ifindex for interface `eth1:0`) Apr 18 13:07:43 fc14 libvirtd: 13:07:43.185: error : interfaceGetXMLDesc:355 : internal error could not get interface XML description (netcf: NETLINK socket operation failed - couldn't find ifindex for interface `eth1:1`) I see several references that indicate this may be a bug. Or have I configured something wrong? I have some interfaces configured to be a bridge and others are configured as a regular network, with the guests being masqueraded. It's certainly possible I've configured something incorrectly. I'm not sure what information to provide to help troubleshoot this. Any information would be greatly appreciated. Thanks, Alex

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[libvirt-users] Accessing a MAC address from inside the VM?
by David Lane 19 Apr '11

19 Apr '11

Greetings, I have a very simple problem, but the resolution is proving rather complex. Bare with me, I will attempt to explain. I have a host machine with no GUI. I attach an existing .img file to the host machine and need to change the MAC address (since the image was created on another machine). Is there a way from with in the guest to do this or do I have muck with the XML? And if I muck with the XML and change it, how do I pass this information up to the guest, or will the guest see it automagically or do I have to write it down and then manually transfer it into the guest's ifcfg? Using the GUI, when you change the NIC, the guest generally does not see the new MAC and grouses until you change it. Thanks. DAVID

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[libvirt-users] USB2 passthrough
by Marco van Beek 19 Apr '11

19 Apr '11

Hi, I am trying to get a USB device working on a Windows 7 virtual machine, and it needs USB2 to work, so the USB passthrough does not work. I have searched for an answer and either the answer is so obvious I am being thick, or too complicated for anyone to address it. Can I simply do a PCI passthrough of a USB host controller? Would that then give me a whole load of USB2 ports I could connect to my computer? I would have to find out which port was connected to which controller, but surely it can't be that simple? Thanks, Marco -- Marco van Beek =================================================== Forget About IT Ltd. Grove Park Studios, 188-192 Sutton Court Rd, London, W4 3HR =================================================== T: 0870 757 2924 F: 0870 757 2926 M: 0788 770 3604 E: mvanbeek(a)forgetaboutit.net W: http://www.forgetaboutit.net/ =================================================== Forget About IT and FABIT are registered trademarks =================================================== Company Registered in England No. 05375739 ===================================================

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