[Platform] Move env check function to platform interface

vllm/engine/arg_utils.py

@@ -2051,7 +2051,7 @@ def create_engine_config(
 
         device_config = DeviceConfig(device=cast(Device, current_platform.device_type))
 
-        envs.validate_environ(self.fail_on_environ_validation)
+        current_platform.validate_environ(self.fail_on_environ_validation)
 
         # Check if the model is a speculator and override model/tokenizer/config
         # BEFORE creating ModelConfig, so the config is created with the target model

vllm/envs.py

@@ -2249,15 +2249,6 @@ def is_set(name: str):
     raise AttributeError(f"module {__name__!r} has no attribute {name!r}")
 
 
-def validate_environ(hard_fail: bool) -> None:
-    for env in os.environ:
-        if env.startswith("VLLM_") and env not in environment_variables:
-            if hard_fail:
-                raise ValueError(f"Unknown vLLM environment variable detected: {env}")
-            else:
-                logger.warning("Unknown vLLM environment variable detected: %s", env)
-
-
 def compile_factors() -> dict[str, object]:
     """Return env vars used for torch.compile cache keys.
 

vllm/platforms/interface.py

@@ -1334,6 +1334,24 @@ def is_arch_support_pdl(cls) -> bool:
         """
         return False
 
+    @classmethod
+    def validate_environ(cls, hard_fail: bool) -> None:
+        """
+        Validate environment variables for the current platform.
+        """
+        from vllm import envs
+
+        for env in os.environ:
+            if env.startswith("VLLM_") and env not in envs.environment_variables:
+                if hard_fail:
+                    raise ValueError(
+                        f"Unknown vLLM environment variable detected: {env}"
+                    )
+                else:
+                    logger.warning(
+                        "Unknown vLLM environment variable detected: %s", env
+                    )
+
 
 class UnspecifiedPlatform(Platform):
     _enum = PlatformEnum.UNSPECIFIED