Maintainers for libvirt are Debian Libvirt Maintainers <pkg-libvirt-maintainers@lists.alioth.debian.org>.
You may want to refer to the following individual bug pages: libnss-libvirt, libvirt-clients, libvirt-clients-qemu, libvirt-daemon, libvirt-daemon-config-network, libvirt-daemon-config-nwfilter, libvirt-daemon-driver-lxc, libvirt-daemon-driver-qemu, libvirt-daemon-driver-storage-gluster, libvirt-daemon-driver-storage-iscsi-direct, libvirt-daemon-driver-storage-rbd, libvirt-daemon-driver-storage-zfs, libvirt-daemon-driver-vbox, libvirt-daemon-driver-xen, libvirt-daemon-system, libvirt-daemon-system-systemd, libvirt-daemon-system-sysv, libvirt-dev, libvirt-doc, libvirt-l10n, libvirt-login-shell, libvirt-sanlock, libvirt-wireshark, libvirt0.
You might like to refer to the libvirt package page, or to the Package Tracking System.
If you find a bug not listed here, please report it.