June 2012 - Users - libvirt List Archives

[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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[libvirt-users] Libvirt hangs until service is stopped and started again
by Ananth 13 Jun '12

13 Jun '12

Hi, The connection to libvirt seems to be hanging until the service is stopped and started again. But when i checked the status of libvirtd service (on Centos) and libvirt-bin service (on Ubuntu), service is still running. But any new connections and existing connections remain hung.I am using 0.9.4 version of libvirt on both the machines. I also found the following links reporting the same issue. https://bugzilla.redhat.com/show_bug.cgi?id=796451 http://www.redhat.com/archives/libvir-list/2009-June/msg00434.html Is this a known problem or is there a solution for this issue? Kindly let me know if there is a work around to avoid libvirt from hanging. Thank you. -- Regards Ananth

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

12 Jun '12

On Tue, Jun 12, 2012 at 11:35:28AM +0400, Andrey Korolyov wrote: > Just a stupid question: did you pin guest vcpus or NIC` hw queues? > Unpinned vm may seriously affect I/O performance when running on same > core set as NIC(hwraid/fc/etc). Thanks. No question is stupid. Obviously, this shouldn't be so slow at VM I/O so I'm missing something. In my defense, there is no single coherent set of documents on this stuff, unless those are kept in a secret place. It would be a fine thing if a few of the people who know all the "obvious" stuff about libvirt-based KVM configuration would collaborate and document it fully somewhere. When I Google "pinned vcpu" all the top responses are about Xen. I run KVM. I find mention that "KVM uses the linux scheduler for distributing workload rather than actually assigning physical CPUs to VMs," at http://serverfault.com/questions/235143/can-i-provision-half-a-core-as-a-vi…. Is that wrong? Are you suggesting RAID will end up on one CPU core, and if the VM ends up on the same core there's I/O trouble? I can see that for software RAID. But we're running hardware RAID. Isn't that handled in the hardware of the RAID controller? Isn't that the point of hardware RAID, to keep it off the CPU? In any case the slow IO is true of all the VMs, so presumably they're properly spread out over CPU cores (of which there are more than VMs, and each VM is configured to take only one), which would rule out the general problem being the shared use of any one core by other system processes. Whit

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

12 Jun '12

On Tue, Jun 12, 2012 at 11:35:28AM +0400, Andrey Korolyov wrote: > Just a stupid question: did you pin guest vcpus or NIC` hw queues? > Unpinned vm may seriously affect I/O performance when running on same > core set as NIC(hwraid/fc/etc). Thanks. No question is stupid. Obviously, this shouldn't be so slow at VM I/O so I'm missing something. In my defense, there is no single coherent set of documents on this stuff, unless those are kept in a secret place. It would be a fine thing if a few of the people who know all the "obvious" stuff about libvirt-based KVM configuration would collaborate and document it fully somewhere. When I Google "pinned vcpu" all the top responses are about Xen. I run KVM. I find mention that "KVM uses the linux scheduler for distributing workload rather than actually assigning physical CPUs to VMs," at http://serverfault.com/questions/235143/can-i-provision-half-a-core-as-a-vi…. Is that wrong? Are you suggesting RAID will end up on one CPU core, and if the VM ends up on the same core there's I/O trouble? I can see that for software RAID. But we're running hardware RAID. Isn't that handled in the hardware of the RAID controller? Isn't that the point of hardware RAID, to keep it off the CPU? In any case the slow IO is true of all the VMs, so presumably they're properly spread out over CPU cores (of which there are more than VMs, and each VM is configured to take only one), which would rule out the general problem being the shared use of any one core by other system processes. Whit

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[libvirt-users] ruby-libvirt connection stays open
by "Gergely Pál - night[w]" 12 Jun '12

12 Jun '12

Hi, I have a problem regarding the Ruby bindings of Libvirt. The sort summary is that the connection does not closed properly when I have retrieved a domain from it. The small sample code is the following (I use irb for easy reading of return values): The working connection closing (when I do nothing with the connection): 1.9.3p125 :001 > require 'libvirt' => true 1.9.3p125 :002 > conn = Libvirt::open('qemu+ssh://localhost/system') => #<Libvirt::Connect:0x00000001a40c30> 1.9.3p125 :003 > conn.close => nil 1.9.3p125 :004 > conn.closed? => true (Note: I know I should not use ssh for localhost, it's just a test, in general we use different remote hosts for this, so ssh is needed.) In this case there is no connection left open. But look at this code: 1.9.3p125 :001 > require 'libvirt' => true 1.9.3p125 :002 > conn = Libvirt::open('qemu+ssh://localhost/system') => #<Libvirt::Connect:0x00000001af3d80> 1.9.3p125 :003 > domain = conn.lookup_domain_by_name('gomboc18') => #<Libvirt::Domain:0x00000001adf0d8> 1.9.3p125 :004 > conn.close => nil 1.9.3p125 :005 > conn.closed? => true And i run a ps auxww there are the relevant processes: nightw 9241 0.2 0.3 88380 13256 pts/0 Sl+ 11:39 0:00 irb nightw 9248 0.0 0.0 41188 2772 pts/0 S+ 11:39 0:00 ssh localhost sh -c 'nc -q 2>&1 | grep "requires an argument" >/dev/null;if [ $? -eq 0 ] ; then CMD="nc -q 0 -U /var/run/libvirt/libvirt-sock";else CMD="nc -U /var/run/libvirt/libvirt-sock";fi;eval "$CMD";' root 9249 0.0 0.0 85752 3696 ? Ss 11:39 0:00 sshd: nightw [priv] nightw 9402 0.0 0.0 85752 1692 ? S 11:39 0:00 sshd: nightw@notty nightw 9403 0.0 0.0 4272 584 ? Ss 11:39 0:00 sh -c nc -q 2>&1 | grep "requires an argument" >/dev/null;if [ $? -eq 0 ] ; then CMD="nc -q 0 -U /var/run/libvirt/libvirt-sock";else CMD="nc -U /var/run/libvirt/libvirt-sock";fi;eval "$CMD"; nightw 9406 0.0 0.0 14136 472 ? S 11:39 0:00 nc -q 0 -U /var/run/libvirt/libvirt-sock And they remain open until i close irb (or the original ruby application on the real development system) Do you have any suggestions for solving this problem? Thanks, Pal

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[libvirt-users] virsh: migration job: unexpectedly failed
by Xing.x.Gao 12 Jun '12

12 Jun '12

Hi,I am use virsh and test the migration command, on server.example.com: # rpm -qa|grep libvirt libvirt-0.9.10-21.el6.x86_64 libvirt-python-0.9.10-21.el6.x86_64 libvirt-client-0.9.10-21.el6.x86_64 # virsh version Compiled against library: libvir 0.9.10 Using library: libvir 0.9.10 Using API: QEMU 0.9.10 Running hypervisor: QEMU 0.14.1 #cat /etc/libvirt/libvirt.conf uri_aliases = [ "host1=qemu+ssh://root@host1.example.com/system", ] node1.example.com is the same version with server.example.com and on both server has the same storage pool with same path, first step,as use the local storage,i copied the vm win7's disk from server.example.com to node1.example.com's storage pool,and did a pool-refresh. 2nd step: on server.example.com i use this command to do the migration job: #virsh start win7 # virsh migrate win7 host1 --copy-storage-inc --persistent --live --unsafe when the migation process begin ,i can see the win7 appear on the node1.example.com whos status is paused,but just after a few secs,errs come out: (server.example.com) # virsh migrate win7 host1 --copy-storage-inc --persistent --live --unsafe error: operation failed: migration job: unexpectedly failed error: Reconnected to the hypervisor i've tried to solve this problem, but failed. thanks.

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[libvirt-users] How to list and change domain's disk image file
by Ricardo Hillbrecht 12 Jun '12

12 Jun '12

Hi I'm writing a C program using libvirt API and need to list the storage volumes used by each domain. I'm wondering if there is a way to do this better of searching the XML strings of all domains, does anyone can suggest me something ? I also need to create a function to change the img file of a given domain. I intend to do the following: 1. virDomainGetXMLDesc (domain) 2. change the XML to other img file 3. virDomainUndefine (domain) 4. virDomainCreateXML (changed XML) Am i correct doing this ? There is a better method ? Thanks Ricardo

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[libvirt-users] A RFE for libvirt
by Sebastien Douche 08 Jun '12

08 Jun '12

On Thu, Jun 7, 2012 at 12:38 AM, Eric Blake <eblake(a)redhat.com> wrote: > I personally find it easier to use virt-manager or virt-install or > gnome-boxes to create an initial guest template, then to modify that XML > for any final tweaks before using the guest in earnest. Right, but the lack of provisioning is a huge miss. Before to use a remote tool (libvirt), you must 1/ connect on the remote machine, 2/ create a xml file and 3/ define the domain. > how easy it would be to add guest templating directly into libvirt, nor > whether it would be duplicating effort that has already been coded > elsewhere. Integrating virt-install & virt-clone would be imho very good start point. -- Sebastien Douche <sdouche(a)gmail.com> Twitter: @sdouche / G+: +sdouche

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[libvirt-users] A RFE for libvirt
by whuang 08 Jun '12

08 Jun '12

Hi, I am a libvirt user , there is a requirement about libvirt : I need a virsh cmd like "#virsh *create-as* --disk --net " to create a very sample guest I have not xml file and I think it's a little hard for me to create a NEW xml for libvirt , so I need a virsh cmd like "vol-create-as " help me do that. I know there are a lot of options for creating a guest , I just need --disk and --net options , others libvirt can set a defaut value . I just want an easy way to create a guest :> Wenlong -- Best Regards! Wenlong Huang IRC Account: wenlong Phone: 62608117 / 15011214521

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[libvirt-users] Fine grained authorisation
by Sam Wilson 07 Jun '12

07 Jun '12

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Hi List, I am trying to provide a solution using KVM on RHEL for a number of technical staff sharing server resources. We would like to be able to "restrict" a number of guests from certain users to follow the principle of least privilege. So in short, is there a way of defining access to individual guests via libvirt / polkit or is read only / read write the best we can expect for the foreseeable future? Cheers, Sam -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.18 (GNU/Linux) iF4EAREIAAYFAk/QWhsACgkQFdt86iEfl/cYagD9FGktnsqyGkfzXWkUyFtJmQc2 VX6ZG2iXmKD75R7c6IgA/j5WvnsXdBA6jPO9/WnX83CmmorPc9oRN6lpYTxXgkON =38VZ -----END PGP SIGNATURE-----

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Re: [libvirt-users] The default location of vm snapshots
by SimpleCloud 07 Jun '12

07 Jun '12

Thanks a lot for the details. From http://wiki.libvirt.org/page/Snapshots, we have to pause the domain before taking snapshot and resume after. Is there any way to do "live" snapshotting for running domain or reduce pause time? Thanks, Lei ------------------ Original ------------------ From: "Eric Blake"<eblake(a)redhat.com>; Date: Wed, Jun 6, 2012 08:24 PM To: "SimpleCloud"<simplecloud(a)qq.com>; Cc: "libvirt-users"<libvirt-users(a)redhat.com>; Subject: Re: [libvirt-users] The default location of vm snapshots On 06/06/2012 03:20 AM, SimpleCloud wrote: > Hi all, > > > Where could I find the memory dump and disk snapshots for vm after command "virsh snapshot-create <some_running_vm>"? Thanks in advance. This particular form of snapshot is called the 'system checkpoint' snapshot, and the current qemu implementation is that the snapshot creates internal snapshots in your qcow2 files. If you do 'qemu-img info $path_to_img', you will see the disk snapshots listed as internal snapshots for each image associated with the domain, as well as the first qcow2 file also having memory associated with the internal snapshot. > > > I found the xml files in /var/lib/libvirt/qemu/snapshot/, but hava no idea about the raw snapshot file. Looking in /var/lib/libvirt is generally unsupported (that is an internal libvirt detail, and subject to change in future releases). The only way to safely look at the snapshot XML is via the API (virDomainSnapshotGetXMLDesc, which is wrapped by 'virsh snapshot-dumpxml'). I am also hoping to submit a patch that will allow you the option to create an external snapshot rather than using qcow2 internal snapshots, but that's not in the code base yet. -- Eric Blake eblake(a)redhat.com +1-919-301-3266 Libvirt virtualization library http://libvirt.org

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[libvirt-users] qemu-img snapshots with backing stores?
by Sean Abbott 07 Jun '12

07 Jun '12

So, I was attempting to use qemu snapshots with backing stores. The QEMU docs (http://wiki.qemu.org/Documentation/CreateSnapshot) make it sound like you simply point your qemu at the snapshot after it's creation, and you're golden. When attempting this with libvirt, though, it fails. I created a snapshot using the above tutorial. the resulting file is disk.0, and a qmeu-img info on it returns: image: disk.0 file format: qcow2 virtual size: 29G (31457280000 bytes) disk size: 140K cluster_size: 65536 backing file: /var/lib/one/public/lin_client_current.qcow2 (actual path: /var/lib/one/public/lin_client_current.qcow2) So that all looks groovy, right? Then, I created (via opennebula) an xml deployment file like so: http://paste.ubuntu.com/1027145/ When I attempt to do a virsh create, I get the following errors: virsh # create deployment.0 error: Failed to create domain from deployment.0 error: internal error process exited while connecting to monitor: file=/var/lib/one/vm/56/images/disk.0,if=none,id=drive-virtio-disk0,boot=on,format=qcow2,cache=none qemu-kvm: boot=on|off is deprecated and will be ignored. Future versions will reject this parameter. Please update your scripts. qemu-system-x86_64: -drive file=/var/lib/one/vm/56/images/disk.0,if=none,id=drive-virtio-disk0,boot=on,format=qcow2,cache=none,boot=on: could not open disk image /var/lib/one/vm/56/images/disk.0: Invalid argument So...something isn't working. Is it possible to do this, or should I give up on this path? Thanks! sean

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[libvirt-users] The default location of vm snapshots
by SimpleCloud 06 Jun '12

06 Jun '12

Hi all, Where could I find the memory dump and disk snapshots for vm after command "virsh snapshot-create <some_running_vm>"? Thanks in advance. I found the xml files in /var/lib/libvirt/qemu/snapshot/, but hava no idea about the raw snapshot file. Thanks, Lei

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[libvirt-users] [Fwd: error: this function is not supported by the connection driver : virConnectNumOfStoragePool]
by Onkar 06 Jun '12

06 Jun '12

Hello All, Any idea on this issue ? Regards, Onkar -------- Forwarded Message -------- From: Onkar <kernzap(a)gmail.com> To: libvir-list <libvir-list(a)redhat.com> Subject: error: this function is not supported by the connection driver : virConnectNumOfStoragePool Date: Wed, 30 May 2012 21:29:42 +0530 Hello, I configured libvirt like this ./configure --prefix=/ --exec-prefix=/usr/ --libdir=/usr/lib64/ --with-storage-dir --with-storage-dir --with-storage-dir --with-storage-dir --with-storage-dir --with-storage-dir --with-storage-dir --with-storage-dir --with-qemu --with-libvirtd --with-selinux --with-network --with-libblkid and then, make -j4 make install and then # virsh list --all Id Name State ---------------------------------------------------- - vm1 shut off # virsh pool-list --all error: Failed to list active pools error: this function is not supported by the connection driver: virConnectNumOfStoragePools getting this error , any clues on why is this error ? Regards, Onkar

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[libvirt-users] converting save/dump output into physical memory image
by Andrew Tappert 05 Jun '12

05 Jun '12

A lot of people in the security community, myself included, are interested in memory forensics these days. Virtualization is a natural fit with memory forensics because it allows one to get access to a guest's memory without having to introduce any extra software into the guest or otherwise interfere with it. Incident responders are particularly interested in getting memory dumps from systems they're investigating. Virsh has "save" and "dump" commands for storing the state of a guest to a file on disk, but memory of KVM guests doesn't get saved in the "standard" input format for memory forensics tools, which is a raw physical memory image. (This is what you'd get via the classical "dd /dev/mem" approach or the contemporary equivalent using the crash driver; and VMware Server and Workstation produce .vmem files, which are such raw physical memory images, when a guest is paused or snapshotted.) In order to analyze the memory of Libvirt/KVM guests with my Linux memory forensics software, Second Look, I've created a tool for converting Libvirt-QEMU-save files (output of virsh save command) or QEMU-savevm files (output of virsh dump command) to raw physical memory images. I've got a basic working capability, though I'm still tracking down some problems with a guest allocated 8GB RAM--not all the memory seems to be present in the save or dump file. And I haven't tested very extensively yet, version support is limited to what I myself am currently running, etc. I'd like to know if this is a capability that others are interested in. Is this something that would be of interest to the Libvirt project if I were to contribute the code, or to the KVM project, or do you think it best exists as a separate project? I've also got a proof-of-concept tool for converting hibernate images to raw physical memory images. Perhaps a collection of tools for converting various memory dump formats would be a good project. Anyone else interested in this kind of stuff? As an author of commercial memory forensics software I've got a vested interest in availability of good memory acquisition capabilities. But there are a number of people working on FOSS Linux memory analysis tools, too... Andrew

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[libvirt-users] guest fails to start: Error initializing virtio-net-pci
by Ekkard Gerlach 03 Jun '12

03 Jun '12

Hi, squeeze host, winxp guest. guest fails to start: PCI: devfn 24 not available fpr virtio-net-pci, in use by virtio-blk-pci Error initializing virtio-net-pci xml-File: ======== <disk type='file' device='disk'> <driver name='qemu' type='raw'/> <source file='/var/lib/winxp'/> <target dev='hda' bus='ide'/> <address type='drive' controller='0' bus='0' unit='0'/> </disk> this added: <disk type='file' device='disk'> <driver name='qemu' type='raw'/> <source file='/var/lib/winxp-d'/> <target dev='hdb' bus='virtio'/> <address type='drive' controller='0' bus='0' unit='1'/> </disk> root@squeeze64:~# lsmod | grep virt virtio_balloon 2961 0 virtio_net 10573 0 virtio_blk 4225 0 virtio_pci 5511 0 virtio_ring 3258 1 virtio_pci virtio 3309 4 virtio_balloon,virtio_net,virtio_blk,virtio_pci root@squeeze64:~# dpkg -l | egrep "kvm|qemu|virt" ii etherboot-qemu 5.4.4-9 Bootstrapping for various network adapters (qemu) ii gvfs 1.6.4-3 userspace virtual filesystem - server ii kvm 1:0.12.5+dfsg-5+squeeze8 dummy transitional package from kvm to qemu-kvm ii libvirt-bin 0.8.3-5+squeeze2 the programs for the libvirt library ii libvirt0 0.8.3-5+squeeze2 library for interfacing with different virtualization systems ii python-libvirt 0.8.3-5+squeeze2 libvirt Python bindings ii qemu 0.12.5+dfsg-3squeeze1 fast processor emulator ii qemu-keymaps 0.12.5+dfsg-3squeeze1 QEMU keyboard maps ii qemu-kvm 0.12.5+dfsg-5+squeeze8 Full virtualization on x86 hardware ii qemu-system 0.12.5+dfsg-3squeeze1 QEMU full system emulation binaries ii qemu-user 0.12.5+dfsg-3squeeze1 QEMU user mode emulation binaries ii qemu-utils 0.12.5+dfsg-3squeeze1 QEMU utilities ii virt-manager 0.8.4-8 desktop application for managing virtual machines ii virt-viewer 0.2.1-1 Displaying the graphical console of a virtual machine ii virtinst 0.500.3-2 Programs to create and clone virtual machines I sucessfully added a virtio NIC: <interface type='bridge'> <mac address='52:54:00:a6:fb:ab'/> <source bridge='br0'/> <model type='virtio'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface> an I installed the driver from red hat "virtio-win-0.1-22.iso". But adding a virtio disk fails. any ideas? Ekkard

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[libvirt-users] PCI Passthrough, AMD, fails to initialize
by Chris Sanders 03 Jun '12

03 Jun '12

I'm looking for assistance with pci-passthrough on CentOS 6.2. I've installed libvirt version: 0.9.4, package: 23.el6_2.8 from yum. I have a windows XP client setup via virt-manager which boots and runs fine until I attempt to assign a PCI device to it. The error log reads: -----------------/var/log/libvirt/qemu/SageTv.log---------------- 2012-06-02 22:55:07.801: starting up LC_ALL=C PATH=/sbin:/usr/sbin:/bin:/usr/bin QEMU_AUDIO_DRV=spice /usr/libexec/qemu-kvm -S -M rhel6.2.0 -cpu Opteron_G3,+wdt,+skinit,+osvw,+3dnowprefetch,+cr8legacy,+extapic,+cmp_legacy,+pdpe1gb,+fxsr_opt,+mmxext,+aes,+sse4.2,+sse4.1,+ssse3,+ht,+vme -enable-kvm -m 3048 -smp 2,sockets=2,cores=1,threads=1 -name SageTv -uuid bf80f6a5-1471-9415-e502-88c4999319c7 -nodefconfig -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/SageTv.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=localtime,driftfix=slew -no-shutdown -boot order=c,menu=on -device virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x5 -drive file=/dev/vg_hdd/lv_sagetv,if=none,id=drive-virtio-disk0,format=raw,cache=none,aio=native -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x6,drive=drive-virtio-disk0,id=virtio-disk0 -drive if=none,media=cdrom,id=drive-ide0-1-0,readonly=on,format=raw -device ide-drive,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0 -netdev tap,fd=24,id=hostnet0,vhost=on,vhostfd=25 -device virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:b9:bf:b0,bus=pci.0,addr=0x3 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -chardev spicevmc,id=charchannel0,name=vdagent -device virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=com.redhat.spice.0 -usb -device usb-tablet,id=input0 -spice port=5900,addr=127.0.0.1,disable-ticketing -vga std -device intel-hda,id=sound0,bus=pci.0,addr=0x4 -device hda-duplex,id=sound0-codec0,bus=sound0.0,cad=0 -device pci-assign,host=04:07.0,id=hostdev0,configfd=26,bus=pci.0,addr=0x8 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x7 char device redirected to /dev/pts/1 do_spice_init: starting 0.8.3 spice_server_add_interface: SPICE_INTERFACE_MIGRATION spice_server_add_interface: SPICE_INTERFACE_KEYBOARD spice_server_add_interface: SPICE_INTERFACE_MOUSE spice_server_add_interface: SPICE_INTERFACE_PLAYBACK spice_server_add_interface: SPICE_INTERFACE_RECORD Failed to assign device "hostdev0" : Invalid argument qemu-kvm: -device pci-assign,host=04:07.0,id=hostdev0,configfd=26,bus=pci.0,addr=0x8: Device 'pci-assign' could not be initialized 2012-06-02 22:55:08.744: shutting down -----------------/var/log/libvirt/qemu/SageTv.log---------------- After this I find the dmesg shows: -----------------dmesg------------------ pci-stub 0000:04:07.0: PCI INT A -> GSI 21 (level, low) -> IRQ 21 pci-stub 0000:04:07.0: restoring config space at offset 0x1 (was 0x2100000, writing 0x2100002) assign device 4:7.0 failed -----------------dmesg------------------ In case this was an IRQ problem I checked my /proc/interrupts. -----------------interrupts------------------ CPU0 CPU1 CPU2 CPU3 CPU4 CPU5 CPU6 CPU7 0: 130 0 0 0 0 0 0 0 IO-APIC-edge timer 1: 0 0 1 1 0 0 0 0 IO-APIC-edge i8042 8: 0 1 0 0 0 0 0 0 IO-APIC-edge rtc0 9: 0 0 0 0 0 0 0 0 IO-APIC-fasteoi acpi 17: 0 0 0 0 0 0 0 0 IO-APIC-fasteoi ehci_hcd:usb1, ehci_hcd:usb2, ehci_hcd:usb3 18: 0 0 0 0 0 0 0 0 IO-APIC-fasteoi ohci_hcd:usb4, ohci_hcd:usb5, ohci_hcd:usb6, ohci_hcd:usb7 19: 587 2219 1807 588 602 600 687 607 IO-APIC-fasteoi ahci 21: 422 430 7316 402 410 405 429 412 IO-APIC-fasteoi 24: 0 0 0 0 0 0 0 0 PCI-MSI-edge AMD-Vi 25: 12 10 9 20 11 15 15 15 PCI-MSI-edge radeon 26: 7 8 7 10 9 8 10 9 PCI-MSI-edge hda_intel 27: 0 0 0 0 0 0 0 0 PCI-MSI-edge xhci_hcd 28: 7098 36221 19 24 19 20 28 20 PCI-MSI-edge eth0 NMI: 0 0 0 0 0 0 0 0 Non-maskable interrupts LOC: 22088 22355 9472 12483 6371 11086 5211 7987 Local timer interrupts SPU: 0 0 0 0 0 0 0 0 Spurious interrupts PMI: 0 0 0 0 0 0 0 0 Performance monitoring interrupts PND: 0 0 0 0 0 0 0 0 Performance pending work RES: 61166 42503 6683 11920 2681 3534 4120 2460 Rescheduling interrupts CAL: 197 302 301 303 290 300 314 318 Function call interrupts TLB: 1406 1551 464 1749 350 897 485 563 TLB shootdowns TRM: 0 0 0 0 0 0 0 0 Thermal event interrupts THR: 0 0 0 0 0 0 0 0 Threshold APIC interrupts MCE: 0 0 0 0 0 0 0 0 Machine check exceptions MCP: 1 1 1 1 1 1 1 1 Machine check polls ERR: 0 MIS: 0 -----------------interrupts------------------ To get to this point I've confirmed IOMMU is loading on boot. during boot a grep for AMD-Vi returns: -----------------AMD-Vi------------------ AMD-Vi: Enabling IOMMU at 0000:00:00.2 cap 0x40 AMD-Vi: Initialized for Passthrough Mode AMD-Vi: Enabling IOMMU at 0000:00:00.2 cap 0x40 -----------------AMD-Vi------------------ I've set: allow_unsafe_assigned_interrupts. I've set selinux to permissive I've set user and group for qemu to 'root' I've set clear_emulator_capabilites = 0 I've set relaxed_acs_check = 1 Finally, if there's a better forum to ask this question in please let me know. I've already tried #kvm and #virt on IRC with no reply yet. I've tried the CentOS 6.2 forums with no reply. Thanks, Chris P.S. I didn't subscribe, just sent this email. If by some odd chance, I can't see replies w/o subscribing someone please let me know. (sanders.chris(a)gmail.com)

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[libvirt-users] Resize qcow2 disks
by Javi Legido 02 Jun '12

02 Jun '12

Good morning. I already tried: 1. http://michael.orlitzky.com/articles/resizing_a_kvm_or_qemu_disk_image.php Result: OS system can't see the disk space sudo qemu-img resize /var/lib/libvirt/images/mysql-1.qcow2 +8G ls -lath /var/lib/libvirt/images/mysql-1.qcow2 -rw------- 1 libvirt-qemu kvm 10G jun 1 15:35 /var/lib/libvirt/images/mysql-1.qcow2 # pvresize /dev/vda5 Physical volume "/dev/vda5" changed 1 physical volume(s) resized / 0 physical volume(s) not resized # lvextend -L8G /dev/template/root Extending logical volume root to 8.00 GiB Insufficient free space: 1630 extents needed, but only 0 available 2. http://blog.wpkg.org/2010/10/04/resizing-qcow2-images/ Result: OS system can't see the disk space My 3rd option is to install libguestfs-tools package, but I would like to avoid it since it's not part of Debian release. Any good step by step guide to enlarge a qcow2 + LVM virtual disk? Thanks

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