guest: DragonFly dfbsd 6.5-DEVELOPMENT #0: Thu Jul 2 06:02:54 UTC 2026 X86_64_GENERIC
GPU: none (QEMU virtio/vga) — amdgpu/cz_ih not instantiable on this guest;
     the wptr source is device-side DMA into the writeback slot, which
     software on the guest cannot produce.