Libvirt: error on update qemu from backports

[Enrico Rivarola <henry_thebuilder@yahoo.it>]

Hi,
I'm on 'Debian GNU/Linux 11.1 (bullseye) x86_64',
in my system the latest qemu (1:6.1+dfsg-6~bpo11+1) seam to break libvirt-daemon when try to 
upgrade the packages from backports,

here is the output of 'apt-get -t bullseye-backports dist-upgrade':

----------------------------------------------------------
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Calculating upgrade... Done
The following packages were automatically installed and are no longer required:
  augeas-lenses libaugeas0 libnetcf1 libvirt-daemon-config-network 
libvirt-daemon-config-nwfilter libvirt-daemon-system-systemd mdevctl
Use 'apt autoremove' to remove them.
The following packages will be REMOVED:
  libvirt-daemon libvirt-daemon-driver-lxc libvirt-daemon-driver-vbox libvirt-daemon-driver-xen 
libvirt-daemon-system
The following packages will be upgraded:
  qemu qemu-block-extra qemu-system qemu-system-arm qemu-system-common qemu-system-data 
qemu-system-gui qemu-system-mips qemu-system-misc qemu-system-ppc
  qemu-system-sparc qemu-system-x86 qemu-utils
13 upgraded, 0 newly installed, 5 to remove and 0 not upgraded.
Need to get 83.3 MB of archives.
After this operation, 8749 kB of additional disk space will be used.
Do you want to continue? [Y/n] n
Abort.
-----------------------------------------------------------

the actual qemu installed is '1:5.2+dfsg-11+deb11u1'.

Is there any way to solve this issue in order to use 'libvirt' with the 'qemu' from backports ?

Thanks in advance

Enrico