diff --git a/tuner/tuner/candidate_gen.py b/tuner/tuner/candidate_gen.py
index 2a544ef55..ca5d035e9 100644
--- a/tuner/tuner/candidate_gen.py
+++ b/tuner/tuner/candidate_gen.py
@@ -38,7 +38,7 @@
 
 tune_logger = logging.getLogger("tune")
 
-
+# TODO: remove the argument 'workgroup_sizes' and 'reduction_sizes'.
 def apply_configuration(
     template: list[str],
     configuration: Configuration,
diff --git a/tuner/tuner/dispatch_constraints.py b/tuner/tuner/dispatch_constraints.py
index 915e84711..ea5c66f76 100644
--- a/tuner/tuner/dispatch_constraints.py
+++ b/tuner/tuner/dispatch_constraints.py
@@ -222,39 +222,32 @@ def generate_solutions(
 
     int_type = ir.IntegerType.get_signless(64)
 
+    tuner_ctx = TunerContext(ir.Context(), logger)
+
     i = 0
     while solver.check() == z3.sat:
         model = solver.model()
         lookup = lambda var: model[var].as_long()
-        lowering_config_dict = {
-            "mma_kind": getMMAAttr(
-                problem_size.res_type.element_type,
-                lookup(intrinsic_mn),
-                lookup(intrinsic_mn),
-                lookup(intrinsic_k),
-                problem_size.lhs_type.element_type,
-                problem_size.rhs_type.element_type,
-            ),
-            "workgroup": ir.ArrayAttr.get(
-                [
-                    ir.IntegerAttr.get(int_type, lookup(m)),
-                    ir.IntegerAttr.get(int_type, lookup(n)),
-                    ir.IntegerAttr.get(int_type, 0),
-                ]
-            ),
-            "reduction": ir.ArrayAttr.get(
-                [
-                    ir.IntegerAttr.get(int_type, 0),
-                    ir.IntegerAttr.get(int_type, 0),
-                    ir.IntegerAttr.get(int_type, lookup(k)),
-                ]
-            ),  # Placeholder now to be consistent with iree.
-            "subgroup_m_count": ir.IntegerAttr.get(int_type, lookup(sg_m_cnt)),
-            "subgroup_n_count": ir.IntegerAttr.get(int_type, lookup(sg_n_cnt)),
-        }
-
-        lowering_config_attrs = ir.DictAttr.get(lowering_config_dict)
-        lowering_config = iree_gpu.LoweringConfigAttr.get(lowering_config_attrs)
+        mma_attr = getMMAAttr(
+            problem_size.res_type.element_type,
+            lookup(intrinsic_mn),
+            lookup(intrinsic_mn),
+            lookup(intrinsic_k),
+            problem_size.lhs_type.element_type,
+            problem_size.rhs_type.element_type,
+        )
+        lowering_config = get_lowering_config(
+            tuner_ctx=tuner_ctx,
+            mma_kind=mma_attr,
+            workgroup=[lookup(m), lookup(n), 0],
+            reduction=[
+                0,
+                0,
+                lookup(k),
+            ],
+            subgroup_m_count=lookup(sg_m_cnt),
+            subgroup_n_count=lookup(sg_n_cnt),
+        )
         config = Configuration(
             lookup(subgroup_size),
             [lookup(wg_x), lookup(wg_y), lookup(wg_z)],