[V1] port xformers backend to v1 (#21342)

Signed-off-by: Giancarlo Delfin <gdelfin@meta.com>
2025-08-05 10:04:46 -07:00
parent ae87ddd040
commit 469b3ffaaa
6 changed files with 438 additions and 1 deletions
--- a/vllm/engine/arg_utils.py
+++ b/vllm/engine/arg_utils.py
@@ -1469,6 +1469,7 @@ class EngineArgs:
            "TORCH_SDPA_VLLM_V1",
            "FLEX_ATTENTION",
            "TREE_ATTN",
+            "XFORMERS_VLLM_V1",
        ]
        if (envs.is_set("VLLM_ATTENTION_BACKEND")
                and envs.VLLM_ATTENTION_BACKEND not in V1_BACKENDS):