$ bitbake-getvar DISTRO_FEATURES -r virtual/kernel
DISTRO_FEATURES=" systemd usrmerge acl argp ext2 ipv4 ipv6 largefile minidebuginfo pci manpages usbhost vfat virtualization xattr"

recipes-kernel/linux/linux-%.bbappend:

include ${@bb.utils.contains('DISTRO_FEATURES', 'virtualization', 'linux-${KERNEL_META_TYPE}_${LINUX_MAJOR}.${LINUX_MINOR}_virtualization.inc', '', d)}
# ^- does not include (I changed it to require, and if I add something to the else path it errors out)

python __anonymous () {
    # Gather the variables
    virt_enabled = bb.utils.contains('DISTRO_FEATURES', 'virtualization', 'True', '', d )
    # ^- is true
}