[fix] Fixed kvcache offload bugs.

nanovllm/utils/context.py

@@ -27,6 +27,8 @@ class Context:
     prev_kv_chunks: List[Tuple[torch.Tensor, torch.Tensor]] = field(default_factory=list)
     # Current sequence being processed (for chunked prefill to load KV)
     chunked_seq: Any = None
+    # Position within block for decode (used for reading from Decode区)
+    decode_pos_in_block: int = 0
 
 
 _CONTEXT = Context()
@@ -50,6 +52,7 @@ def set_context(
     chunk_offset=0,
     offload_engine=None,
     chunked_seq=None,
+    decode_pos_in_block=0,
 ):
     global _CONTEXT
     _CONTEXT = Context(
@@ -66,6 +69,7 @@ def set_context(
         chunk_offset=chunk_offset,
         offload_engine=offload_engine,
         chunked_seq=chunked_seq,
+        decode_pos_in_block=decode_pos_in_block,
     )