qemu: Fetch/save the default SCSI controller model during hotplug

If we're going to add a controller to the domain, let's set the
default SCSI model value if we cannot find another SCSI controller
already present.

NB: Requires updating the live output test data since the model
will now be formatted.

src/qemu/qemu_hotplug.c

@@ -587,6 +587,7 @@ qemuDomainFindOrCreateSCSIDiskController(virQEMUDriverPtr driver,
 {
     size_t i;
     virDomainControllerDefPtr cont;
+    qemuDomainObjPrivatePtr priv = vm->privateData;
     int model = -1;
 
     for (i = 0; i < vm->def->ncontrollers; i++) {
@@ -615,10 +616,13 @@ qemuDomainFindOrCreateSCSIDiskController(virQEMUDriverPtr driver,
         return NULL;
     cont->type = VIR_DOMAIN_CONTROLLER_TYPE_SCSI;
     cont->idx = controller;
+    if (model == -1)
+        cont->model = qemuDomainGetSCSIControllerModel(vm->def, cont, priv->qemuCaps);
+    else
         cont->model = model;
 
     VIR_INFO("No SCSI controller present, hotplugging one model=%s",
-             virDomainControllerModelSCSITypeToString(model));
+             virDomainControllerModelSCSITypeToString(cont->model));
     if (qemuDomainAttachControllerDevice(driver, vm, cont) < 0) {
         VIR_FREE(cont);
         return NULL;

tests/qemuhotplugtestdomains/qemuhotplug-base-with-scsi-controller-live.xml

@@ -26,19 +26,19 @@
     <controller type='pci' index='0' model='pci-root'>
       <alias name='pci'/>
     </controller>
-    <controller type='scsi' index='0'>
+    <controller type='scsi' index='0' model='virtio-scsi'>
       <alias name='scsi0'/>
       <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
     </controller>
-    <controller type='scsi' index='1'>
+    <controller type='scsi' index='1' model='virtio-scsi'>
       <alias name='scsi1'/>
       <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
     </controller>
-    <controller type='scsi' index='2'>
+    <controller type='scsi' index='2' model='virtio-scsi'>
       <alias name='scsi2'/>
       <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
     </controller>
-    <controller type='scsi' index='3'>
+    <controller type='scsi' index='3' model='virtio-scsi'>
       <alias name='scsi3'/>
       <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
     </controller>

tests/qemuhotplugtestdomains/qemuhotplug-base-without-scsi-controller-live+disk-scsi-2.xml

@@ -36,19 +36,19 @@
     <controller type='pci' index='0' model='pci-root'>
       <alias name='pci'/>
     </controller>
-    <controller type='scsi' index='0'>
+    <controller type='scsi' index='0' model='virtio-scsi'>
       <alias name='scsi0'/>
       <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
     </controller>
-    <controller type='scsi' index='1'>
+    <controller type='scsi' index='1' model='virtio-scsi'>
       <alias name='scsi1'/>
       <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
     </controller>
-    <controller type='scsi' index='2'>
+    <controller type='scsi' index='2' model='virtio-scsi'>
       <alias name='scsi2'/>
       <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
     </controller>
-    <controller type='scsi' index='3'>
+    <controller type='scsi' index='3' model='virtio-scsi'>
       <alias name='scsi3'/>
       <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
     </controller>