- Users - libvirt List Archives

[libvirt-users] Passing literal -cpu model string to qemu
by Richard W.M. Jones 11 Aug '14

11 Aug '14

On aarch64 with -M virt, the default CPU model is cortex-a15 (a 32 bit CPU). This is IMHO a stupid default, but there we are. Therefore most users will need to pass the `-cpu cortex-a53' or `-cpu cortex-a57' flag to qemu, depending on a complex formula of their host CPU and if they are using TCG or not. However I cannot work out how to pass this through libvirt. The obvious one would be: <cpu><model>cortex-a57</model></cpu> This passes `-cpu host' which is both wrong and likely to be a bug. I tried adding various flags and studying the source, but it's extremely non-obvious how to do this. Also adding the following into cpu_map.xml didn't make any difference: --- a/src/cpu/cpu_map.xml +++ b/src/cpu/cpu_map.xml @@ -626,6 +626,11 @@ <vendor name='IBM'/> <pvr value='0x004b0100'/> </model> + </arch> +  + <arch name='aarch64'> + <model name='cortex-a53'/> + <model name='cortex-a57'/> </arch> </cpus> Ideas here? Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com virt-df lists disk usage of guests without needing to install any software inside the virtual machine. Supports Linux and Windows. http://people.redhat.com/~rjones/virt-df/

2 1

[libvirt-users] Windows 8 virtualized on a Linux host
by arnaud gaboury 09 Aug '14

09 Aug '14

I plan to dual boot w8 and Archlinux, and virtualize the same w8 machine with libvirt qemu/kvm. I already did the dual boot. I am now starting the virtualization. My plan was to use the w8 partition as a Disk volume pool [1]. Unfortunately, I didn't noticed only FAT32 was a valid format when I installed w8 on NTFS. I need to change my whole setup, but beforethat, I want to be sure libvirt does not accept NTFS. So please, can you confirm? Then, it seems I am in trouble as my readings let me think w8 will not install on FAT32. Am I correct? Now it sounds to me I am in a dead end. Does anyone have any hint to achieve my plan? Thank you for any suggestions. [1]http://libvirt.org/storage.html

2 1

[libvirt-users] Live blockcopy onto storage pool that is an NFS mount?
by Andrew Martin 08 Aug '14

08 Aug '14

Hello, I am running qemu-kvm 1.4.0 and libvirt 1.0.2 on Ubuntu 12.04. I have two NFS mountpoints configured as two separate pools in virsh: <pool type='dir'> <name>nfs1</name> <uuid>419d799c-2493-6ebc-6848-53b0919e7bad</uuid> <capacity unit='bytes'>6836057014272</capacity> <allocation unit='bytes'>0</allocation> <available unit='bytes'>6836057014272</available> <source> </source> <target> <path>/var/lib/libvirt/images/nfs1</path> <permissions> <mode>0711</mode> <owner>0</owner> <group>0</group> </permissions> </target> </pool> The XML for the nfs2 pool is similar, with the mountpoint being /var/lib/libvirt/images/nfs2. I would like to be able to move the VM disk from one of the NFS mountpoints to another (nfs1 --> nfs2) live. I followed the instructions here: http://thr3ads.net/libvirt-users/2013/02/2174486-Migrate-VMs-to-different-s… However when I attempt the blockcopy command, I receive this error: Failed to create file '/var/lib/libvirt/images/nfs2/vm.qcow2': Operation not permitted Is it not possible to blockcopy in this way to an NFS mount? Thanks, Andrew

2 2

[libvirt-users] File permissions on VNC unix sockets
by Landon Gilbert-Bland 07 Aug '14

07 Aug '14

I am using kvm libvirt/qemu, and am trying to get VNC working with unix sockets. I'm using the following in my XML: <graphics type='vnc' socket='/tmp/kvmtest'/> This works, it creates the unix socket and I can use it for VNC. But it creates the socket with 755 permissions, and owned by libvirt-qemu:kvm. Ideally, I would like it to be 770 root:libvirtd, but could also work with 775 libvirt-qemu:kvm. Basically, I would like the group to be read/write/execute, so that anyone in this group can use virt-manager (or whatever) to get into the vm with vnc. I haven't found a way to change this in the settins. It doesn't seem to be honoring the unix socket settings in /etc/libvirt/libvirdd.conf (it looks like those are only for libvirt-sock and libvirt-sock-ro), and I haven't been able to find any documentation about changing these permissions in the XML. I can manually chmod/chown the socket after it is created (manually or with a cron), but that is far from an ideal solution. I don't suppose anyone has run across a configuration option for this that I have missed? I have only tested this in ubuntu 14.04.1 and debian testing, for what it's worth. Thanks, --landon

1 0

[libvirt-users] Understanding Libvirt Java API in order to get CPU usage of a VM
by Restituto Marcus Arevalo 07 Aug '14

07 Aug '14

I'm having a problemin understanding the Libvirt Java API. Here is my sourcein reading some of the classes: http://libvirt.org/sources/java/javadoc/ I have no idea where to start in order for me to get the CPU usage. Can anybody help? Or at least give me some points on where to start in order for me to get the CPU usage of a VM in KVM? Any suggestions will really help. Thanks regards, Marco

2 1

[libvirt-users] [help] Does "virsh blockpull" works on live virtual machine
by chenyanqiu＠keytonecloud.com 07 Aug '14

07 Aug '14

Hi all, I have a kvm virtual machine running (qemu version 2.0), and I had took several external snapshots of the disk( using "virsh snapshot-create-as"). Now, the existed disk files relationship look like: base <- snap1 <-snap2 <- current using disk file. Now I want to remove snap1 and snap2, and let current disk using the base image file as back file directly. Unfortunately, for some reason, I can not shutdown the vm, and exectue the "virsh blockpull" command. Can I execute the "virsh blockpull" while the vm is power on, and the application in the vm is not affected? Thanks very much! Daniel

2 2

[libvirt-users] possible to dynamically set/add network domain name?
by Rich Megginson 06 Aug '14

06 Aug '14

trying to use virsh net-update to add a domain name libvirt-1.1.3.5-2.fc20.x86_64 sudo virsh net-update default add domain "<domain name='test'/>" --live --config error: this function is not supported by the connection driver: can't update 'domain' section of network 'default' is it possible to add a domain using net-update?

2 2

[libvirt-users] username and passwd after create VM from XML dump
by Yuanzhen Gu 06 Aug '14

06 Aug '14

Good afternoon guys, I created the VM from XML dump, # virsh create vm4.xml and # virsh list I can see the VM running, and I know the ip address for the VM, but how can I know the username and password to login the running VM, which is created from XML dump? is there any place to edit and add the username and password in guest domain XML ? thanks a lot!! Best, Yuanzhen

2 6

[libvirt-users] Ubuntu Trusty: failed to create VM due to permission denied
by Jianfeng Tang 06 Aug '14

06 Aug '14

> Hi, libvirt experts, I used libvirt to create a VM and used backing store to a local file. It works fine until I installed my box to Unbuntu Trusty (14.04). I got the following errors when I tried to start the VM: Could not open backing file: Could not open <path to my backing file>: Permission denied However, if I moved my image file (not base image) to default location /var/lib/libvirt/images. It works. It seems something related to selinux. However, my box seems not have selinux installed at all. Anyone knows how to fix this? Thanks, ~Frank >

2 4

[libvirt-users] libvirt external disk-only snapshot will pause the VM?
by Yuanzhen Gu 06 Aug '14

06 Aug '14

Hello folks, If I give command to take external disk-only live snapshot, such as # virsh snapshot-create-as vm1 snapshot_vm1 --disk-only will the guest OS be paused or suspend while the snapshot being taken? Thanks very much! Best, Yuanzhen

2 8