diff --git a/optimum/exporters/ipex/modeling_utils.py b/optimum/exporters/ipex/modeling_utils.py
index f84c1cd54..336b3871b 100755
--- a/optimum/exporters/ipex/modeling_utils.py
+++ b/optimum/exporters/ipex/modeling_utils.py
@@ -181,7 +181,7 @@ def _llama_model_forward(
         position_ids = torch.arange(
             past_key_values_length, seq_length + past_key_values_length, dtype=torch.long, device=device
         )
-        position_ids = position_ids.unsqueeze(0)
+        position_ids = position_ids.unsqueeze(0).repeat_interleave(input_ids.shape[0], 0)
 
     if inputs_embeds is None:
         inputs_embeds = self.embed_tokens(input_ids)
@@ -195,7 +195,7 @@ def _llama_model_forward(
     next_decoder_cache = () if use_cache else None
 
     position_embeddings = self.rotary_emb(hidden_states, position_ids)
-    if past_key_values_length == 0:
+    if past_key_values_length == 0 and past_key_values is not None:
         # first token, remove the padding from hidden_states, varlen do not accept attention mask
         hidden_states_copy = hidden_states
         index = attention_mask.view(-1) != 0
@@ -298,7 +298,7 @@ def _falcon_model_forward(
         )
 
     if position_ids is None:
-        position_ids = cache_position.unsqueeze(0)
+        position_ids = cache_position.unsqueeze(0).repeat_interleave(input_ids.shape[0], 0)
 
     # Prepare head mask if needed
     # 1.0 in head_mask indicate we keep the head
@@ -310,7 +310,7 @@ def _falcon_model_forward(
     # create position embeddings to be shared across the decoder layers
     position_embeddings = self.rotary_emb(hidden_states, position_ids)
 
-    if past_key_values_length == 0:
+    if past_key_values_length == 0 and past_key_values is not None:
         # first token, remove the padding from hidden_states, varlen do not accept attention mask
         hidden_states_copy = hidden_states
         index = attention_mask.view(-1) != 0
@@ -420,7 +420,7 @@ def _gpt2_model_forward(
     past_length = past_key_values.get_seq_length() if past_key_values is not None else 0
     if position_ids is None:
         position_ids = torch.arange(past_length, input_shape[-1] + past_length, dtype=torch.long, device=device)
-        position_ids = position_ids.unsqueeze(0)
+        position_ids = position_ids.unsqueeze(0).repeat_interleave(input_ids.shape[0], 0)
 
     if inputs_embeds is None:
         inputs_embeds = self.wte(input_ids)
@@ -437,7 +437,7 @@ def _gpt2_model_forward(
 
     hidden_states = self.drop(hidden_states)
 
-    if past_length == 0:
+    if past_length == 0 and past_key_values is not None:
         # first token, remove the padding from hidden_states, varlen do not accept attention mask
         hidden_states_copy = hidden_states
         index = attention_mask.view(-1) != 0
@@ -636,9 +636,9 @@ def forward(
             # prefill
             if past_key_value is None or is_ipex_version("<", _IPEX_MINIMUM_VERSION_FOR_FLASH_VARLEN_ATTN):
                 attn_output = torch.nn.functional.scaled_dot_product_attention(
-                    query,
-                    key,
-                    value,
+                    query.reshape(input_lens.shape[0], -1, query.shape[-1]),
+                    key.reshape(input_lens.shape[0], -1, key.shape[-1]),
+                    value.reshape(input_lens.shape[0], -1, value.shape[-1]),
                     attn_mask=None,
                     is_causal=True,
                 )
diff --git a/optimum/intel/ipex/modeling_base.py b/optimum/intel/ipex/modeling_base.py
index 8611bddd2..d8f830e51 100644
--- a/optimum/intel/ipex/modeling_base.py
+++ b/optimum/intel/ipex/modeling_base.py
@@ -276,6 +276,8 @@ def forward(
         attention_mask: Optional[torch.FloatTensor] = None,
         **kwargs,
     ) -> CausalLMOutputWithPast:
+        if self.add_patch and input_ids is not None and attention_mask is None:
+            attention_mask = torch.ones_like(input_ids)
         return self.model(input_ids=input_ids, attention_mask=attention_mask, **kwargs)
 
     def _prepare_generation_config(