CONFIG_VIRTIO_PCI_ADMIN_LEGACY (not configurable)

configname: CONFIG_VIRTIO_PCI_ADMIN_LEGACY

Linux Kernel Configuration
└─>Device Drivers
└─>Virtio drivers
└─>VIRTIO_PCI_ADMIN_LEGACY
In linux kernel since version 6.8 (release Date: 2024-03-10)  
depends
CONFIG_VIRTIO_MENU
CONFIG_VIRTIO_PCI
CONFIG_COMPILE_TEST or CONFIG_X86

is selected by
CONFIG_VIRTIO_VFIO_PCI