not working KVM config

<domain type='kvm' id='1'>
  <name>vm1</name>
  <uuid>b74a1e55-2f71-3090-9872-96dacd1d4dc6</uuid>
  <memory>1048576</memory>
  <currentMemory>1048576</currentMemory>
  <vcpu>1</vcpu>
  <os>
    <type arch='x86_64' machine='pc-0.12'>hvm</type>
    <boot dev='hd'/>
  </os>
  <features>
    <acpi/>
    <apic/>
    <pae/>
  </features>
  <clock offset='utc'/>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>restart</on_crash>
  <devices>
    <emulator>/usr/bin/kvm</emulator>
    <disk type='block' device='disk'>
      <driver name='qemu' type='raw'/>
      <source dev='/dev/vg/lv_vm1_boot'/>
      <target dev='sda' bus='scsi'/>
      <alias name='scsi0-0-0'/>
      <address type='drive' controller='0' bus='0' unit='0'/>
    </disk>
    <disk type='block' device='disk'>
      <driver name='qemu' type='raw'/>
      <source dev='/dev/vg/lv_vm1_root'/>
      <target dev='sdb' bus='scsi'/>
      <alias name='scsi0-0-1'/>
      <address type='drive' controller='0' bus='0' unit='1'/>
    </disk>
    <disk type='block' device='disk'>
      <driver name='qemu' type='raw'/>
      <source dev='/dev/vg/lv_vm1_swap'/>
      <target dev='sdc' bus='scsi'/>
      <alias name='scsi0-0-2'/>
      <address type='drive' controller='0' bus='0' unit='2'/>
    </disk>
    <disk type='block' device='disk'>
      <driver name='qemu' type='raw'/>
      <source dev='/dev/vg/lv_vm1_data'/>
      <target dev='sdd' bus='scsi'/>
      <alias name='scsi0-0-3'/>
      <address type='drive' controller='0' bus='0' unit='3'/>
    </disk>
    <controller type='scsi' index='0'>
      <alias name='scsi0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
    </controller>
    <interface type='bridge'>
      <mac address='52:54:00:25:0b:ed'/>
      <source bridge='br34'/>
      <target dev='vnet0'/>
      <alias name='net0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
    </interface>
    <input type='mouse' bus='ps2'/>
    <graphics type='vnc' port='5900' autoport='yes' keymap='de'/>
    <video>
      <model type='cirrus' vram='9216' heads='1'/>
      <alias name='video0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
    </video>
    <memballoon model='virtio'>
      <alias name='balloon0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
    </memballoon>
  </devices>
  <seclabel type='dynamic' model='apparmor'>
    <label>libvirt-b74a1e55-2f71-3090-9872-96dacd1d4dc6</label>
    <imagelabel>libvirt-b74a1e55-2f71-3090-9872-96dacd1d4dc6</imagelabel>
  </seclabel>
</domain>