[Model Runner V2][DFlash] Enable dflash attention backend selection (#46770)

Signed-off-by: Giancarlo Delfin <gdelfin@inferact.ai>

Giancarlo Delfin committed Jun 25, 2026 at 21:29 UTC 5314665badcb93f798e117aacad8ce02f148cd73
1 file changed +3 -1
vllm/v1/worker/gpu/spec_decode/dflash/utils.py
+3 -1
@@ -26,7 +26,9 @@ def load_dflash_model(target_model: nn.Module, vllm_config: VllmConfig) -> nn.Mo
26 draft_vllm_config = replace(
27 vllm_config,
28 attention_config=replace(
29 - vllm_config.attention_config, use_non_causal=not causal
29 + vllm_config.attention_config,
30 + use_non_causal=not causal,
31 + backend=speculative_config.attention_backend,
32 ),
33 )
34 with set_model_tag("dflash_head"):