[platforms] restore xpu check for parallel config (#10479)

Signed-off-by: youkaichao <[email protected]>

vllm/platforms/xpu.py

@@ -55,3 +55,13 @@ def check_and_update_config(cls, vllm_config: VllmConfig) -> None:
                 "CUDA graph is not supported on XPU, fallback to the eager "
                 "mode.")
             model_config.enforce_eager = True
+
+        # check and update parallel config
+        parallel_config = vllm_config.parallel_config
+        if (parallel_config.distributed_executor_backend is not None
+                and parallel_config.distributed_executor_backend != "ray"):
+            logger.warning(
+                "%s is not supported on XPU, fallback to ray distributed"
+                " executor backend.",
+                parallel_config.distributed_executor_backend)
+            parallel_config.distributed_executor_backend = "ray"