- Users - libvirt List Archives

[libvirt-users] caps->nguests == 0?
by Zhihua Che 20 Jun '12

20 Jun '12

hi, I compiled the libvirt-0.9.10 and started the libvirtd with sudo. Unfortunately, I got an Error, saying 'virDomainDefParseXML unknown OS type hvm'. I debugged it and found in function virCapabilitiesSupportsGuestOSType, the parameter caps->nguests is 0. On the other hand, I tried start the libvirtd with common user, and creating domain with virsh, i found the caps->ngusts is 2 and had one value 'hvm', so it didn't complain the error above, instead, it complained could not load PC BIOS bios.bin. I'd say I searched a lot and people say it's caused by without loading kvm and kvm-intel module. So, I checked and it is loaded. Any tips here?

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[libvirt-users] unsupported configuration: Reboot is not supported with this QEMU binary
by Xing.x.Gao 19 Jun '12

19 Jun '12

Hello, when i use virsh to reboot a guest,it report a "unsupported configuration: Reboot is not supported with this QEMU binary" error . my libvirt version 0.9.10 and i've tried 0.9.11/12 ,the debug info is in the attachment libvirtd.log, virsh # version --daemon Compiled against library: libvir 0.9.10 Using library: libvir 0.9.10 Using API: QEMU 0.9.10 Running hypervisor: QEMU 0.14.0 Running against daemon: 0.9.10 virsh # list Id Name State ---------------------------------------------------- 6 win7 running 7 f16 running virsh # reboot f16 error: Failed to reboot domain f16 error: unsupported configuration: Reboot is not supported with this QEMU binary thanks.

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[libvirt-users] How to update the QEMU of libvirt?
by GaoYi 19 Jun '12

19 Jun '12

Hi all, I type "version" and the virsh outputs: Compiling library: libvir 0.6.3 ... Management: QEMU 0.9.1 Now I wanna update the QEMU to qemu-kvm-0.14.0. I don't know how to. Can anybody provide any help? Yi

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[libvirt-users] How to set cpu limits to xen domU in libvirt
by Tony Huang 18 Jun '12

18 Jun '12

Hello, I looked in the the documents. Looks like the <cputune> period and quota will only support qemu driver. Of for xen user, how to set the hard cpu limit? -- Tony

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Re: [libvirt-users] [Qemu-devel] How to management KVM virtual machines via libvirt?
by 陳韋任 (Wei-Ren Chen) 18 Jun '12

18 Jun '12

CC'ed to libvirt-users. On Sat, Jun 16, 2012 at 07:00:59PM +0800, GaoYi wrote: > Hi all, > > I am trying to management the VMs created by KVM commandline. However, I > found the libvirt cannot connect to the VMs or manage it from virsh. Can > anybody provide any help? > Best, Shouldn't this go to libvirt mailing list? http://libvirt.org/contact.html Regards, chenwj -- Wei-Ren Chen (陳韋任) Computer Systems Lab, Institute of Information Science, Academia Sinica, Taiwan (R.O.C.) Tel:886-2-2788-3799 #1667 Homepage: http://people.cs.nctu.edu.tw/~chenwj

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[libvirt-users] question regarding CMPIObjectPath
by Ashish Dalela 15 Jun '12

15 Jun '12

Folks, I'm a new user and I'm trying to build a standalone application using libvirt-cim (rather than use a full-fledged CIMOM). I need some help. While calling the CMPIInstanceMI->ft->enumerateInstances, I need to pass a reference to CMPIObjectPath. My application is crashing because I don't know what is the correct constructor for this. If I do ref = CMPIObjectPath () then all the FT pointers are null. Can someone please guide me on how to construct CMPIObjectPath instance before passing to enumerateInstances? Thanks much Ashish

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[libvirt-users] can not connect hypervisor using libvirt-0.9.11 on windows
by xuteng 14 Jun '12

14 Jun '12

Hi,ALL: I compiled the libvirt-0.9.11 source code with mingw on windows according to the website: https://github.com/photron/msys_setup Then I wrote a simple test case ,as below: #include <stdio.h> #include <stdlib.h> #include "libvirt/libvirt.h" int main(int argc,char **argv) { virConnectPtr conn; conn = virConnectOpen("qemu+tcp://192.168.1.6/system"); if (conn = NULL) { fprintf(stderr,"Failed to open connection to qemu+tcp://192.168.1.6/system"); return 1; } virConnectClose(conn); return 0; } When linked to the dll just compiled , it came out with error : NOTE: you should run 'diskperf -y' to enable the disk statistics libvir: RPC error : Unable to set close-on-exec flag: No such file or directory libvir: error : invalid connection pointer in virConnectClose When using gdb to debug the testcase , break the function virConnectOpen , then step ,the error info was: Program received signal ?,Unknown signal. 0x7c92e4ff in ntdll!LdrAlternateResourcesEnabled () from C:\WINDOWS.0\system32\ntdll.dll Any suggestion would be appreciated ! Best Regards! xuteng via foxmail

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[libvirt-users] Reconnection problem with a USB device
by Dale Amon 14 Jun '12

14 Jun '12

This is going to be a bit off the wall as I doubt many people are using a VM in quite the same manner as I am in this case. I have a new scanner at home, a Mustek A3USB 1200 Pro, which requires a vendor supplied version of libsane to run. That is a pain in the behind just to start with. To use that scanner requires a 32b machine with sufficiently old versions of various libraries. My primary machine, a laptop, is 64b and runs current software. So, in order to use my inexpensive large format scanner, I had to set up a 32b VM on my laptop that is running an old linux. I tunneled the USB device to it: <hostdev mode='subsystem' type='usb' managed='no'> <source> <vendor id='0x055f'/> <product id='0x040b'/> <address bus='3' device='8'/> </source> <alias name='hostdev0'/> </hostdev> That works fine... until I have to go into the office. Once I disconnected the USB go away for 10 hours and come back, it fails to re-engage. The USB seems to get grabbed up by the laptop itself instead of the VM. The only way to get it to work again is to halt the VM and do a cold boot of it. This is annoying to say the least because I lose 'state' when I boot, ie the set of windows and files open that remind me of where I left off on a project before going to work. Any suggestions how to get around this annoying issue?

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[libvirt-users] What's the most recent compatible libvirt and qemu-kvm?
by Whit Blauvelt 14 Jun '12

14 Jun '12

Figured I'd test qemu-kvm-1.0.1 and libvirt-0.9.12, but the result after default compiles is: root@black:/usr/local/sbin# ./libvirtd 2012-06-12 19:53:41.894+0000: 6076: info : libvirt version: 0.9.12 2012-06-12 19:53:41.894+0000: 6076: warning : ebiptablesDriverInit:4084 : Could not find 'ebtables' executable 2012-06-12 19:53:42.675+0000: 6076: error : qemuCapsComputeCmdFlags:1209 : unsupported configuration: this qemu binary requires libvirt to be compiled with yajl 2012-06-12 19:53:42.677+0000: 6076: error : virDomainDefParseXML:8312 : internal error No guest options available for arch 'x86_64' Is it just the "yajl" thing missing, or is this combo just not to be expected to work? Also, should http://libvirt.org/compiling.html mention "yajl"? Thanks, Whit

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[libvirt-users] How can a bridge be optimized?
by Whit Blauvelt 14 Jun '12

14 Jun '12

Hi, Netperf tells me that a KVM VM using a bridged connection to a system across the Gigabit LAN sees on average about 1/10th of the bandwidth the host sees. This is on very lightly loaded hosts, although with multiple low-use VMs. I've tried adjusting the CPU throttling after seeing that mentioned as a possible factor in slowing down a bridge, but it has not much if any effect here. Is there a good guide somewhere to what might make a difference with this? I recall the kernel recently adding a new alternative for handling VM interfaces, but can't recall what it was called. Would that be a marked improvement? Is it supported by libvirt? Thanks, Whit

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