qemu: Tweak index number checking

Moving the check and rewriting it this way doesn't alter
the current behavior, but will allow us to special-case
pci-root down the line.
Signed-off-by: NAndrea Bolognani <abologna@redhat.com>
Reviewed-by: NLaine Stump <laine@laine.org>

src/qemu/qemu_command.c

@@ -2717,6 +2717,26 @@ qemuBuildControllerDevStr(const virDomainDef *domainDef,
         break;
 
     case VIR_DOMAIN_CONTROLLER_TYPE_PCI:
+        switch ((virDomainControllerModelPCI) def->model) {
+        case VIR_DOMAIN_CONTROLLER_MODEL_PCI_BRIDGE:
+        case VIR_DOMAIN_CONTROLLER_MODEL_DMI_TO_PCI_BRIDGE:
+        case VIR_DOMAIN_CONTROLLER_MODEL_PCIE_ROOT_PORT:
+        case VIR_DOMAIN_CONTROLLER_MODEL_PCIE_SWITCH_UPSTREAM_PORT:
+        case VIR_DOMAIN_CONTROLLER_MODEL_PCIE_SWITCH_DOWNSTREAM_PORT:
+        case VIR_DOMAIN_CONTROLLER_MODEL_PCI_EXPANDER_BUS:
+        case VIR_DOMAIN_CONTROLLER_MODEL_PCIE_EXPANDER_BUS:
+            if (def->idx == 0) {
+                virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                               _("index for pci controllers of model '%s' must be > 0"),
+                               virDomainControllerModelPCITypeToString(def->model));
+                goto error;
+            }
+            break;
+        case VIR_DOMAIN_CONTROLLER_MODEL_PCI_ROOT:
+        case VIR_DOMAIN_CONTROLLER_MODEL_PCIE_ROOT:
+        case VIR_DOMAIN_CONTROLLER_MODEL_PCI_LAST:
+            break;
+        }
         switch ((virDomainControllerModelPCI) def->model) {
         case VIR_DOMAIN_CONTROLLER_MODEL_PCI_BRIDGE:
             if (def->opts.pciopts.modelName
@@ -2977,12 +2997,6 @@ qemuBuildControllerDevStr(const virDomainDef *domainDef,
                            _("wrong function called"));
             goto error;
         }
-        if (def->idx == 0) {
-            virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
-                           _("index for pci controllers of model '%s' must be > 0"),
-                           virDomainControllerModelPCITypeToString(def->model));
-            goto error;
-        }
         break;
 
     case VIR_DOMAIN_CONTROLLER_TYPE_IDE: