Bionic/Ussuri versions:
ubuntu@cloud6:~$ dpkg -l | grep nova
ii  nova-api-metadata                    2:21.0.0-0ubuntu0.20.04.1~cloud0                            all          OpenStack Compute - metadata API frontend
ii  nova-common                          2:21.0.0-0ubuntu0.20.04.1~cloud0                            all          OpenStack Compute - common files
ii  nova-compute                         2:21.0.0-0ubuntu0.20.04.1~cloud0                            all          OpenStack Compute - compute node base
ii  nova-compute-kvm                     2:21.0.0-0ubuntu0.20.04.1~cloud0                            all          OpenStack Compute - compute node (KVM)
ii  nova-compute-libvirt                 2:21.0.0-0ubuntu0.20.04.1~cloud0                            all          OpenStack Compute - compute node libvirt support
ii  python3-nova                         2:21.0.0-0ubuntu0.20.04.1~cloud0                            all          OpenStack Compute Python 3 libraries
ii  python3-novaclient                   2:17.0.0-0ubuntu1~cloud0                                    all          client library for OpenStack Compute API - 3.x
ubuntu@cloud6:~$ dpkg -l | grep libvirt
ii  libvirt-clients                      6.0.0-0ubuntu8.2~cloud0                                     amd64        Programs for the libvirt library
ii  libvirt-daemon                       6.0.0-0ubuntu8.2~cloud0                                     amd64        Virtualization daemon
ii  libvirt-daemon-driver-qemu           6.0.0-0ubuntu8.2~cloud0                                     amd64        Virtualization daemon QEMU connection driver
ii  libvirt-daemon-driver-storage-rbd    6.0.0-0ubuntu8.2~cloud0                                     amd64        Virtualization daemon RBD storage driver
ii  libvirt-daemon-system                6.0.0-0ubuntu8.2~cloud0                                     amd64        Libvirt daemon configuration files
ii  libvirt-daemon-system-systemd        6.0.0-0ubuntu8.2~cloud0                                     amd64        Libvirt daemon configuration files (systemd)
ii  libvirt0:amd64                       6.0.0-0ubuntu8.2~cloud0                                     amd64        library for interfacing with different virtualization systems
ii  nova-compute-libvirt                 2:21.0.0-0ubuntu0.20.04.1~cloud0                            all          OpenStack Compute - compute node libvirt support
ii  python3-libvirt                      6.1.0-1~cloud0                                              amd64        libvirt Python 3 bindings
ubuntu@cloud6:~$ dpkg -l | grep qemu
ii  ipxe-qemu                            1.0.0+git-20180124.fbe8c52d-0ubuntu2.2                      all          PXE boot firmware - ROM images for qemu
ii  ipxe-qemu-256k-compat-efi-roms       1.0.0+git-20150424.a25a16d-0ubuntu2                         all          PXE boot firmware - Compat EFI ROM images for qemu
ii  libvirt-daemon-driver-qemu           6.0.0-0ubuntu8.2~cloud0                                     amd64        Virtualization daemon QEMU connection driver
ii  qemu-block-extra:amd64               1:4.2-3ubuntu6.3~cloud0                                     amd64        extra block backend modules for qemu-system and qemu-utils
ii  qemu-kvm                             1:4.2-3ubuntu6.3~cloud0                                     amd64        QEMU Full virtualization on x86 hardware
ii  qemu-system-common                   1:4.2-3ubuntu6.3~cloud0                                     amd64        QEMU full system emulation binaries (common files)
ii  qemu-system-data                     1:4.2-3ubuntu6.3~cloud0                                     all          QEMU full system emulation (data files)
ii  qemu-system-gui:amd64                1:4.2-3ubuntu6.3~cloud0                                     amd64        QEMU full system emulation binaries (user interface and audio support)
ii  qemu-system-x86                      1:4.2-3ubuntu6.3~cloud0                                     amd64        QEMU full system emulation binaries (x86)
ii  qemu-utils                           1:4.2-3ubuntu6.3~cloud0                                     amd64        QEMU utilities
ubuntu@cloud6:~$ qemu-system-x86_64 --version
QEMU emulator version 4.2.0 (Debian 1:4.2-3ubuntu6.3~cloud0)
Copyright (c) 2003-2019 Fabrice Bellard and the QEMU Project developers
ubuntu@cloud6:~$ virsh version
Compiled against library: libvirt 6.0.0
Using library: libvirt 6.0.0
Using API: QEMU 6.0.0
Running hypervisor: QEMU 4.2.0