---
features:
  - |
    Qemu>=5.0.0 bumped the default tb-cache size to 1GiB(from 32MiB) and this
    made it difficult to run multiple guest VMs on systems running with lower
    memory. With Libvirt>=8.0.0 it's possible to configure lower tb-cache
    size. A new config option is introduced:

    ``[libvirt]tb_cache_size``

    This config option can be used to configure tb_cache size
    for guest VMs, it's only applicable with ``virt_type=qemu``.