libvirt users - Sep 2020 - Problem with xen hvm DomU

Hi

can someone say me whats wrong in this config:

<domain type='xen'>
   <name>fenrir.chao5.int</name>
   <uuid>7aedcd03-54e8-4055-8d1b-37dd34194859</uuid>
   <memory unit='KiB'>2097152</memory>
   <currentMemory unit='KiB'>2097152</currentMemory>
   <vcpu placement='static'>2</vcpu>
   <os>
     <type arch='x86_64' machine='xenfv'>hvm</type>
     <loader type='rom'>/usr/lib/xen/boot/hvmloader</loader>
     <kernel>/usr/lib64/xen/boot/hvmloader</kernel>
     <boot dev='hd'/>
   </os>
   <features>
     <acpi/>
     <apic/>
     <pae/>
   </features>
   <clock offset='variable' adjustment='0'
basis='localtime'/>
   <on_poweroff>destroy</on_poweroff>
   <on_reboot>restart</on_reboot>
   <on_crash>restart</on_crash>
   <devices>
     <disk type='file' device='disk'>
       <driver name='qemu' type='raw'/>
       <source file='/dev/vg_astarte/lv_fenrir_root'/>
       <target dev='hda' bus='ide'/>
       <address type='drive' controller='0' bus='0'
target='0' unit='0'/>
     </disk>
     <disk type='file' device='disk'>
       <driver name='qemu' type='raw'/>
       <source file='/dev/vg_astarte/lv_fenrir_swap'/>
       <target dev='hdb' bus='ide'/>
       <address type='drive' controller='0' bus='0'
target='0' unit='1'/>
     </disk>
     <controller type='xenbus' index='0'/>
     <controller type='ide' index='0'/>
     <interface type='bridge'>
       <mac address='00:16:3e:05:30:04'/>
       <source bridge='xenbr5'/>
       <script path='vif-bridge'/>
       <model type='netfront'/>
     </interface>
     <interface type='bridge'>
       <mac address='00:16:3e:04:30:04'/>
       <source bridge='xenbr4'/>
       <script path='vif-bridge'/>
       <model type='netfront'/>
     </interface>
     <interface type='bridge'>
       <mac address='00:16:3e:15:30:04'/>
       <source bridge='xenbr15'/>
       <script path='vif-bridge'/>
       <model type='netfront'/>
     </interface>
     <interface type='bridge'>
       <mac address='00:16:3e:14:30:04'/>
       <source bridge='xenbr14'/>
       <script path='vif-bridge'/>
       <model type='netfront'/>
     </interface>
     <input type='mouse' bus='ps2'/>
     <input type='keyboard' bus='ps2'/>
     <graphics type='vnc' port='6000' autoport='no'
listen='0.0.0.0'>
       <listen type='address' address='0.0.0.0'/>
     </graphics>
     <video>
       <model type='cirrus' vram='8192' heads='1'
primary='yes'/>
     </video>
     <memballoon model='xen'/>
   </devices>
</domain>

If I try to start it with virsh create... then I see only:

error: Failed to create domain from
/etc/libvirt/libxl/fenrir.chao5.int.xml
error: internal error: libxenlight failed to create new domain
'fenrir.chao5.int'

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Greetz