--- features: - | Add new ``hw:locked_memory`` extra spec and ``hw_locked_memory`` image property to lock memory on libvirt guest. Locking memory marks the guest memory allocations as unmovable and unswappable. ``hw:locked_memory`` extra spec and ``hw_locked_memory`` image property accept boolean values in string format like 'Yes' or 'false' value. Exception `LockMemoryForbidden` will raise, if you set lock memory value but not set either flavor extra spec ``hw:mem_page_size`` or image property ``hw_mem_page_size``, so we can ensure that the scheduler can actually account for this correctly and prevent out of memory events.