Thank,
so that comes down to
operation="file_receive" profile="/usr/sbin/libvirtd" pid=8341 
comm="qemu-system-x86" family="unix" sock_type="stream" requested_mask="send 
receive" denied_mask="send receive" addr=none peer_addr=none 
peer="libvirt-50fea9df-e318-490a-aca6-725c8bcb75e3"

operation="file_receive" profile="/usr/sbin/libvirtd" pid=8341 comm
="qemu-system-x86" family="unix" sock_type="stream" protocol=0
requested_mask="send receive" denied_mask="send receive" addr=none
peer_addr=none peer="libvirt-50fea9df-e318-490a-aca6-725c8bcb75e3"

We have:
apparmor/libvirt-qemu
unix (send, receive) type=stream addr=none peer=(label=/usr/sbin/libvirtd),

That seems to be vice versa to the new virtualization stacks DENIED message.
So instead of the old where qemu contacted libvirt, this is libvirt contacting 
qemu (maybe due to an upstream change).

I tried to reproduce your case, but it doesn't trigger for me (yet - i'm
going on to try differently).

Could you add the following line:
  unix (send, receive) type=stream addr=none 
peer=(label=libvirt-[0-9a-f]*-[0-9a-f]*-[0-9a-f]*-[0-9a-f]*-[0-9a-f]*),
to the file:
  /etc/apparmor.d/local/usr.sbin.libvirtd

Then restart libvirtd (systemctl restart libvirtd) and then try again?
That should allow the connection in said direction.

If the above is not working we could fall back to a simpler pattern like:
  unix (send, receive) type=stream addr=none peer=(label=libvirt-*),

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https://bugs.launchpad.net/bugs/1741617

Title:
  Mouse integration not working

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