diff --git a/tests/v1/kv_connector/nixl_integration/config_sweep_accuracy_test.sh b/tests/v1/kv_connector/nixl_integration/config_sweep_accuracy_test.sh
index 040632249d34..d0a56304f2a6 100755
--- a/tests/v1/kv_connector/nixl_integration/config_sweep_accuracy_test.sh
+++ b/tests/v1/kv_connector/nixl_integration/config_sweep_accuracy_test.sh
@@ -21,19 +21,20 @@ dp_ep_configs=(
 "DP_EP=1 GPU_MEMORY_UTILIZATION=0.8 PREFILLER_TP_SIZE=1 DECODER_TP_SIZE=2 MODEL_NAMES=deepseek-ai/deepseek-vl2-tiny" # MLA+P-TP1, D-DPEP=2 (TP=1)
 "DP_EP=1 GPU_MEMORY_UTILIZATION=0.8 PREFILLER_TP_SIZE=2 DECODER_TP_SIZE=2 MODEL_NAMES=deepseek-ai/deepseek-vl2-tiny" # MLA+P-TP2, D-DPEP=2 (TP=1)
 )
+# We assume HMA enabled by default.
 hybrid_ssm_configs=(
-  "VLLM_SSM_CONV_STATE_LAYOUT=DS ENABLE_HMA_FLAG=1 GPU_MEMORY_UTILIZATION=0.8 MODEL_NAMES=ibm-granite/granite-4.0-h-tiny VLLM_SERVE_EXTRA_ARGS=--max-model-len,8192,--trust-remote-code"
+  "VLLM_SSM_CONV_STATE_LAYOUT=DS GPU_MEMORY_UTILIZATION=0.8 MODEL_NAMES=ibm-granite/granite-4.0-h-tiny VLLM_SERVE_EXTRA_ARGS=--max-model-len,8192,--trust-remote-code"
   # TODO: (NickLucche) Address async scheduling issue with TP>1 separately as this may impact other models.
-  "VLLM_SSM_CONV_STATE_LAYOUT=DS ENABLE_HMA_FLAG=1 PREFILLER_TP_SIZE=2 DECODER_TP_SIZE=2 GPU_MEMORY_UTILIZATION=0.8 MODEL_NAMES=ibm-granite/granite-4.0-h-tiny VLLM_SERVE_EXTRA_ARGS=--max-model-len,8192,--trust-remote-code,--no-async-scheduling"
+  "VLLM_SSM_CONV_STATE_LAYOUT=DS PREFILLER_TP_SIZE=2 DECODER_TP_SIZE=2 GPU_MEMORY_UTILIZATION=0.8 MODEL_NAMES=ibm-granite/granite-4.0-h-tiny VLLM_SERVE_EXTRA_ARGS=--max-model-len,8192,--trust-remote-code,--no-async-scheduling"
   # GDN (Qwen3.5)
-  "VLLM_SSM_CONV_STATE_LAYOUT=DS ENABLE_HMA_FLAG=1 GPU_MEMORY_UTILIZATION=0.8 MODEL_NAMES=Qwen/Qwen3.5-0.8B"
-  "VLLM_SSM_CONV_STATE_LAYOUT=DS ENABLE_HMA_FLAG=1 PREFILLER_TP_SIZE=1 DECODER_TP_SIZE=2 GPU_MEMORY_UTILIZATION=0.8 MODEL_NAMES=Qwen/Qwen3.5-0.8B VLLM_SERVE_EXTRA_ARGS=--no-async-scheduling"
+  "VLLM_SSM_CONV_STATE_LAYOUT=DS GPU_MEMORY_UTILIZATION=0.8 MODEL_NAMES=Qwen/Qwen3.5-0.8B"
+  "VLLM_SSM_CONV_STATE_LAYOUT=DS PREFILLER_TP_SIZE=1 DECODER_TP_SIZE=2 GPU_MEMORY_UTILIZATION=0.8 MODEL_NAMES=Qwen/Qwen3.5-0.8B VLLM_SERVE_EXTRA_ARGS=--no-async-scheduling"
 )
 sw_attn_configs=(
   # NOTE: gemma3 does not work with FlashInfer
   "GPU_MEMORY_UTILIZATION=0.8 MODEL_NAMES=google/gemma-3-4b-it VLLM_SERVE_EXTRA_ARGS=--max-model-len,8192" # SW model
-  "ENABLE_HMA_FLAG=1 GPU_MEMORY_UTILIZATION=0.8 MODEL_NAMES=google/gemma-3-4b-it PREFILLER_TP_SIZE=1 DECODER_TP_SIZE=2 VLLM_SERVE_EXTRA_ARGS=--max-model-len,8192"
-  "ENABLE_HMA_FLAG=1 GPU_MEMORY_UTILIZATION=0.8 MODEL_NAMES=google/gemma-3-4b-it PREFILLER_TP_SIZE=2 DECODER_TP_SIZE=1 VLLM_SERVE_EXTRA_ARGS=--max-model-len,8192"
+  "GPU_MEMORY_UTILIZATION=0.8 MODEL_NAMES=google/gemma-3-4b-it PREFILLER_TP_SIZE=1 DECODER_TP_SIZE=2 VLLM_SERVE_EXTRA_ARGS=--max-model-len,8192"
+  "GPU_MEMORY_UTILIZATION=0.8 MODEL_NAMES=google/gemma-3-4b-it PREFILLER_TP_SIZE=2 DECODER_TP_SIZE=1 VLLM_SERVE_EXTRA_ARGS=--max-model-len,8192"
 )
 
 # Select config array based on DP_EP env var
@@ -50,14 +51,6 @@ else
   configs=("${tp_configs[@]}")
 fi
 
-if [[ -n "${ENABLE_HMA_FLAG:-}" ]]; then
-  # Append ENABLE_HMA_FLAG=1 to each config in the selected array
-  echo "ENABLE_HMA_FLAG is set, appending ENABLE_HMA_FLAG=1 to each config"
-  for i in "${!configs[@]}"; do
-    configs[$i]="ENABLE_HMA_FLAG=1 ${configs[$i]}"
-  done
-fi
-
 run_tests() {
   local label=$1
   local extra_args=$2
diff --git a/tests/v1/kv_connector/nixl_integration/config_sweep_spec_decode_test.sh b/tests/v1/kv_connector/nixl_integration/config_sweep_spec_decode_test.sh
index 313efc3968dd..f55bd308a0a6 100755
--- a/tests/v1/kv_connector/nixl_integration/config_sweep_spec_decode_test.sh
+++ b/tests/v1/kv_connector/nixl_integration/config_sweep_spec_decode_test.sh
@@ -11,7 +11,7 @@ SCRIPT="v1/kv_connector/nixl_integration/spec_decode_acceptance_test.sh"
 eagle3_config="SD_METHOD=eagle3 MODEL_NAME=meta-llama/Llama-3.1-8B-Instruct SD_MODEL=RedHatAI/Llama-3.1-8B-Instruct-speculator.eagle3 NUM_SPEC_TOKENS=3"
 
 # MTP: Qwen3.5-0.8B-Base with hybrid SSM flags.
-mtp_config="SD_METHOD=mtp MODEL_NAME=Qwen/Qwen3.5-0.8B-Base SD_MODEL=Qwen/Qwen3.5-0.8B-Base NUM_SPEC_TOKENS=1 BLOCK_SIZE=32 MAX_MODEL_LEN=4096 VLLM_SSM_CONV_STATE_LAYOUT=DS ENABLE_HMA_FLAG=1 KV_BUFFER_DEVICES=cuda"
+mtp_config="SD_METHOD=mtp MODEL_NAME=Qwen/Qwen3.5-0.8B-Base SD_MODEL=Qwen/Qwen3.5-0.8B-Base NUM_SPEC_TOKENS=1 BLOCK_SIZE=32 MAX_MODEL_LEN=4096 VLLM_SSM_CONV_STATE_LAYOUT=DS KV_BUFFER_DEVICES=cuda"
 
 configs=(
   "$eagle3_config"
diff --git a/tests/v1/kv_connector/nixl_integration/run_accuracy_test.sh b/tests/v1/kv_connector/nixl_integration/run_accuracy_test.sh
index fc446a0e7658..bde246c9b661 100755
--- a/tests/v1/kv_connector/nixl_integration/run_accuracy_test.sh
+++ b/tests/v1/kv_connector/nixl_integration/run_accuracy_test.sh
@@ -5,11 +5,6 @@ set -xe
 KV_BUFFER_DEVICE="cuda"  # Default to cuda
 ATTENTION_BACKEND=""  # Default to empty (use vllm default)
 CROSS_LAYERS_BLOCKS="False"
-ENABLE_HMA_VAR=""  # Default to empty (HMA disabled by default for kv connector)
-# Check for ENABLE_HMA_FLAG environment variable
-if [[ -n "${ENABLE_HMA_FLAG:-}" ]]; then
-  ENABLE_HMA_VAR="--no-disable-hybrid-kv-cache-manager"
-fi
 
 while [[ $# -gt 0 ]]; do
   case $1 in
@@ -37,9 +32,6 @@ echo "Running accuracy tests with kv_buffer_device=$KV_BUFFER_DEVICE"
 if [[ -n "$ATTENTION_BACKEND" ]]; then
   echo "Using attention backend: $ATTENTION_BACKEND"
 fi
-if [[ -n "$ENABLE_HMA_VAR" ]]; then
-  echo "HMA (Hybrid KV Cache Manager) enabled"
-fi
 if [[ -n "$VLLM_SERVE_EXTRA_ARGS" ]]; then
   echo "vLLM serve extra args: $VLLM_SERVE_EXTRA_ARGS"
 fi
@@ -180,10 +172,6 @@ run_tests_for_model() {
       BASE_CMD="${BASE_CMD} --attention-backend=$ATTENTION_BACKEND"
     fi
 
-    # Add HMA flag if specified
-    if [[ -n "$ENABLE_HMA_VAR" ]]; then
-      BASE_CMD="${BASE_CMD} $ENABLE_HMA_VAR"
-    fi
     
     FULL_CMD="$BASE_CMD"
     eval "$FULL_CMD &"
@@ -232,10 +220,6 @@ run_tests_for_model() {
       BASE_CMD="${BASE_CMD} --attention-backend=$ATTENTION_BACKEND"
     fi
 
-    # Add HMA flag if specified
-    if [[ -n "$ENABLE_HMA_VAR" ]]; then
-      BASE_CMD="${BASE_CMD} $ENABLE_HMA_VAR"
-    fi
 
   # DP-EP attention mode
   if [[ -z "$DP_EP" ]]; then
diff --git a/tests/v1/kv_connector/nixl_integration/spec_decode_acceptance_test.sh b/tests/v1/kv_connector/nixl_integration/spec_decode_acceptance_test.sh
index 2c5622a2f0e1..bc90680a5334 100755
--- a/tests/v1/kv_connector/nixl_integration/spec_decode_acceptance_test.sh
+++ b/tests/v1/kv_connector/nixl_integration/spec_decode_acceptance_test.sh
@@ -27,7 +27,6 @@
 #                                       ROCM_AITER_UNIFIED_ATTN
 #                         NVIDIA options: FLASH_ATTN, FLASHINFER
 #   VLLM_SSM_CONV_STATE_LAYOUT - SSM conv state layout (e.g. "DS" required for Mamba models)
-#   ENABLE_HMA_FLAG     - set to 1 to enable hybrid KV cache manager
 #   VLLM_SERVE_EXTRA_ARGS - comma-separated extra args for vllm serve
 set -ex
 
@@ -85,13 +84,7 @@ if [[ -z "${ATTENTION_BACKEND:-}" ]]; then
 fi
 echo "Using attention backend: ${ATTENTION_BACKEND}"
 
-# ── HMA & extra serve args ────────────────────────────────────────────
-
-ENABLE_HMA_VAR=""
-if [[ -n "${ENABLE_HMA_FLAG:-}" ]]; then
-  ENABLE_HMA_VAR="--no-disable-hybrid-kv-cache-manager"
-  echo "HMA (Hybrid KV Cache Manager) enabled"
-fi
+# ── Extra serve args ─────────────────────────────────────────────────
 
 EXTRA_SERVE_ARGS=()
 if [[ -n "${VLLM_SERVE_EXTRA_ARGS:-}" ]]; then
@@ -258,7 +251,6 @@ run_test_for_device() {
       --kv-transfer-config "$kv_config" \
       --speculative-config "$PREFILL_SPEC_CONFIG" \
       --attention-backend $ATTENTION_BACKEND \
-      ${ENABLE_HMA_VAR} \
       ${EXTRA_SERVE_ARGS[@]+"${EXTRA_SERVE_ARGS[@]}"} &
     local SERVER_PID=$!
 
@@ -298,7 +290,6 @@ run_test_for_device() {
       --kv-transfer-config "$kv_config" \
       --speculative-config "$DECODE_SPEC_CONFIG" \
       --attention-backend $ATTENTION_BACKEND \
-      ${ENABLE_HMA_VAR} \
       ${EXTRA_SERVE_ARGS[@]+"${EXTRA_SERVE_ARGS[@]}"} &
     local SERVER_PID=$!
 
diff --git a/tests/v1/kv_connector/unit/test_nixl_connector_hma.py b/tests/v1/kv_connector/unit/test_nixl_connector_hma.py
index 6d4e6565e373..8d54353f82a8 100644
--- a/tests/v1/kv_connector/unit/test_nixl_connector_hma.py
+++ b/tests/v1/kv_connector/unit/test_nixl_connector_hma.py
@@ -386,8 +386,6 @@ def test_fewer_blocks_with_hma(monkeypatch, model_name, sw_size):
         "kv_transfer_config": kv_transfer_config,
         "max_model_len": 2048,
         "max_num_seqs": 1,
-        # NOTE: Make sure HMA is enabled
-        "disable_hybrid_kv_cache_manager": False,
         "max_num_batched_tokens": 2048,
         "enable_prefix_caching": False,
         "block_size": block_size,