conf: Add helper function to look up disk controller model

src/conf/domain_conf.c

@@ -2502,6 +2502,23 @@ virDomainParseLegacyDeviceAddress(char *devaddr,
     return 0;
 }
 
+int
+virDomainDiskFindControllerModel(virDomainDefPtr def,
+                                 virDomainDiskDefPtr disk,
+                                 int controllerType)
+{
+    int model = -1;
+    int i;
+
+    for (i = 0; i < def->ncontrollers; i++) {
+        if (def->controllers[i]->type == controllerType &&
+            def->controllers[i]->idx == disk->info.addr.drive.controller)
+            model = def->controllers[i]->model;
+    }
+
+    return model;
+}
+
 int
 virDomainDiskDefAssignAddress(virCapsPtr caps, virDomainDiskDefPtr def)
 {

src/conf/domain_conf.h

@@ -1729,6 +1729,9 @@ void virDomainGraphicsDefFree(virDomainGraphicsDefPtr def);
 void virDomainInputDefFree(virDomainInputDefPtr def);
 void virDomainDiskDefFree(virDomainDiskDefPtr def);
 void virDomainDiskHostDefFree(virDomainDiskHostDefPtr def);
+int virDomainDiskFindControllerModel(virDomainDefPtr def,
+                                     virDomainDiskDefPtr disk,
+                                     int controllerType);
 void virDomainControllerDefFree(virDomainControllerDefPtr def);
 void virDomainFSDefFree(virDomainFSDefPtr def);
 void virDomainActualNetDefFree(virDomainActualNetDefPtr def);

src/libvirt_private.syms

@@ -302,6 +302,7 @@ virDomainDiskDefFree;
 virDomainDiskDeviceTypeToString;
 virDomainDiskErrorPolicyTypeFromString;
 virDomainDiskErrorPolicyTypeToString;
+virDomainDiskFindControllerModel;
 virDomainDiskIndexByName;
 virDomainDiskInsert;
 virDomainDiskInsertPreAlloced;