guest 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
compiler: cc 8.3 [DragonFly] Release/2019-02-22
kernel: X86_64_GENERIC (drm.ko core module present in /boot/kernel but NOT loaded;
        kldstat shows only kernel+ehci+xhci)
radeon presence: NO radeonkms.ko anywhere (/boot/kernel, /boot/modules, /boot/modules.local)
        /dev/dri does not exist; no PCI vendor 1002 (ATI) device (pciconf)
=> the radeon CS ioctl path is not executable on this guest: no ASIC, no driver module.