diff --git a/vllm/attention/selector.py b/vllm/attention/selector.py
index 3f0e29c7..8b07fb2d 100644
--- a/vllm/attention/selector.py
+++ b/vllm/attention/selector.py
@@ -58,6 +58,9 @@ def get_attn_backend(
             ROCmFlashAttentionBackend)
         return ROCmFlashAttentionBackend
     elif backend == _Backend.TORCH_SDPA:
+        # TODO: make XPU backend available here.
+        assert is_cpu(), RuntimeError(
+            "Torch SDPA backend is only used for the CPU device.")
         logger.info("Using Torch SDPA backend.")
         from vllm.attention.backends.torch_sdpa import TorchSDPABackend
         return TorchSDPABackend