CONFIG_VIRTIO_PCI_LIB_LEGACY (not configurable)

modulename: virtio_pci_legacy_dev.ko

configname: CONFIG_VIRTIO_PCI_LIB_LEGACY

Linux Kernel Configuration
└─>Device Drivers
└─>VIRTIO_PCI_LIB_LEGACY
In linux kernel since version 5.2 (release Date: 2019-07-07)  
Legacy PCI device (Virtio PCI Card 0.9.x Draft and older device)
implementation.
This module implements the basic probe and control for devices
which are based on legacy PCI device. Any module that selects this
module must depend on PCI.

source code: