Guest environment (audit QEMU/KVM target, 2026-09-25):

$ uname -a
DragonFly dfbsd 6.5-DEVELOPMENT DragonFly 6.5-DEVELOPMENT #0: Thu Jul  2 06:02:54 UTC 2026  root@dfbsd:/usr/obj/usr/src/sys/X86_64_GENERIC  x86_64

$ pciconf -l
hostb0@pci0:0:0:0:    class=0x060000 card=0x11001af4 chip=0x12378086 rev=0x02 hdr=0x00
isab1@pci0:0:1:0:     class=0x060100 card=0x11001af4 chip=0x70008086 rev=0x00 hdr=0x00
atapci0@pci0:0:1:1:   class=0x010180 card=0x11001af4 chip=0x70108086 rev=0x00 hdr=0x00
none0@pci0:0:1:3:     class=0x068000 card=0x11001af4 chip=0x71138086 rev=0x03 hdr=0x00
vgapci0@pci0:0:2:0:   class=0x030000 card=0x11001af4 chip=0x11111234 rev=0x02 hdr=0x00
virtio_pci0@pci0:0:3:0: class=0x020000 card=0x00011af4 chip=0x10001af4 rev=0x00 hdr=0x00
virtio_pci1@pci0:0:4:0: class=0x010000 card=0x00021af4 chip=0x10011af4 rev=0x00 hdr=0x00

-> NO CardBus (cbb) bridge present. The cardbus/cardbus-cis drivers are compiled
   into the kernel (kldstat -v excerpts):
	16 isa/cbb
	17 pci/cbb
	18 cbb/cardbus
	31 pccard/ata
	73 cardbus/fwohci
	78 cardbus/if_fxp
	154 pccard/if_sn
	165 pccard/wi
	168 pccard/xe
	189 cbb/pccard
	190 pcic/pccard
	198 cardbus/if_dc
	202 cardbus/if_re
	205 cardbus/if_rl
	221 cardbus/if_vge
	228 cardbus/if_xl
	322 pccard/sio
   ...but with zero cbb parent devices there is no cardbus bus instance, so
   cardbus_attach_card / cardbus_detach_card cannot execute on this guest.