[libvirt-users] Snapshots

lukass.vacek at seznam.cz lukass.vacek at seznam.cz
Wed Apr 16 20:55:11 UTC 2014

I would like to ask what I am doing  wrong and what is the best approach to 
resolve this situation:

First of all I start virtual machine by virDomainCreateXML. In my 
application I use libvncclient library that sends mouse events to this 
running domain. I had some troubles with coordinates of mouse cursor but all
problem was solved when I added <input type='tablet' bus='usb'/> to xml 
So now I have a running domain and I want to create snapshot and then after 
some operations I want to restore this snapshot. I use virDomainSave and 
virDomainRestore that work fine. The only problem is, that after creating 
and restoring snapshot I have the same problem with coordinates of mouse. I 
need  to create and restore snapshot also with <input type='tablet' bus=
'usb'/> somewhere specified. I also tried methods  virDomainSaveFlags with 
xml configuration string(see below) as parameter  *dxml, but method fails 
with: libvir: Domain Config error : XML error: domainsnapshot.Unable to 
create snapshot.

What should I add to xml configuration? I look at http://libvirt.org/
formatsnapshot.html on example but I dont know what paths I should use in my
program. I dont understand much snapshots and similar stuff so could you 
give me example how could I edit my xml configuration? Or what I should do 
to make virDomainSave and virDomainRestore work?

xml configuration:

<domain type='kvm'>
                <memory unit='KiB'>524288</memory>
                  <currentMemory unit='KiB'>524288</currentMemory>
                   <type arch='x86_64' machine='pc'>hvm</type>
                   <boot dev='hd'/>
                    <input type='tablet' bus='usb'/>
                    <disk type='file' device='disk'>
                          <source file='/home/lukas/Desktop/Image.img'/>
                          <target dev='hda'/>
                    <interface type='network'>
                          <source network='default'/>
                    <graphics type='vnc' port='5901'>
                        <listen type='address' address=''/>
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