diff --git a/lib/models/qemuhck_device.rb b/lib/models/qemuhck_device.rb
index 30cb7806..4f9501dc 100644
--- a/lib/models/qemuhck_device.rb
+++ b/lib/models/qemuhck_device.rb
@@ -16,6 +16,7 @@ class QemuHCKDevice < T::Struct
       const :post_stop_commands, T::Array[String], default: []
       const :machine_options, T::Array[String], default: []
       const :pluggable_memory_gb, Integer, default: 0
+      const :iommu_device_param, T.nilable(String)
     end
   end
 end
diff --git a/lib/setupmanagers/qemuhck/qemu_machine.rb b/lib/setupmanagers/qemuhck/qemu_machine.rb
index b98b56ed..658bc997 100644
--- a/lib/setupmanagers/qemuhck/qemu_machine.rb
+++ b/lib/setupmanagers/qemuhck/qemu_machine.rb
@@ -183,7 +183,6 @@ def define_local_variables
       @device_commands = []
       @machine_options = %w[@machine_name@]
       @device_extra_param = []
-      @iommu_device_param = []
       @cpu_options = %w[@cpu@ +x2apic +fsgsbase model=@cpu_model@]
       @drive_cache_options = []
       @define_variables = {}
@@ -322,7 +321,7 @@ def options_replacement_map
       {
         '@machine_options@' => (@machine_options + device_machine_options).join(','),
         '@device_extra_param@' => @device_extra_param.join,
-        '@iommu_device_param@' => @iommu_device_param.join,
+        '@iommu_device_param@' => device_iommu_device_param.join,
         '@cpu_options@' => @cpu_options.join(','),
         '@drive_cache_options@' => @drive_cache_options.join
       }
@@ -353,6 +352,11 @@ def device_machine_options
       @device_infos.map(&:machine_options).flatten.compact
     end
 
+    sig { returns(T::Array[String]) }
+    def device_iommu_device_param
+      @device_infos.map(&:iommu_device_param).compact
+    end
+
     def full_replacement_map
       ReplacementMap.new({
                            '@run_id@' => @id,
@@ -400,7 +404,7 @@ def read_device(device)
     end
 
     def normalize_lists
-      [@device_commands, @machine_options, @device_extra_param, @iommu_device_param,
+      [@device_commands, @machine_options, @device_extra_param,
        @cpu_options, @drive_cache_options].each do |arr|
         arr.flatten!
         arr.compact!