diff --git a/vmm/src/api/openapi/cloud-hypervisor.yaml b/vmm/src/api/openapi/cloud-hypervisor.yaml
index 6bb8e989b..6ef576f43 100644
--- a/vmm/src/api/openapi/cloud-hypervisor.yaml
+++ b/vmm/src/api/openapi/cloud-hypervisor.yaml
@@ -510,6 +510,8 @@ components:
         watchdog:
           type: boolean
           default: false
+        platform:
+          $ref: '#/components/schemas/PlatformConfig'
       description: Virtual machine configuration
 
     CpuAffinity:
@@ -557,6 +559,18 @@ components:
           items:
             $ref: '#/components/schemas/CpuAffinity'
 
+    PlatformConfig:
+      type: object
+      properties:
+        num_pci_segments:
+          type: integer
+          format: int16
+        iommu_segments:
+          type: array
+          items:
+            type: integer
+            format: int16
+
     MemoryZoneConfig:
       required:
       - id