qemu: domain: Don't re-allocate qemuCaps in post parse callbacks

The domain post parse callback, domain address callback and the domain
device callback (for every single device) would each grab qemuCaps for
the current emulator. This is quite wasteful. Use the new callback to do
this just once.

src/qemu/qemu_domain.c

@@ -2971,14 +2971,6 @@ qemuDomainDefPostParse(virDomainDefPtr def,
             goto cleanup;
     }
 
-    if (qemuCaps) {
-        virObjectRef(qemuCaps);
-    } else {
-        if (!(qemuCaps = virQEMUCapsCacheLookup(driver->qemuCapsCache,
-                                                def->emulator)))
-            goto cleanup;
-    }
-
     if (qemuDomainDefAddDefaultDevices(def, qemuCaps) < 0)
         goto cleanup;
 
@@ -3004,7 +2996,6 @@ qemuDomainDefPostParse(virDomainDefPtr def,
 
     ret = 0;
  cleanup:
-    virObjectUnref(qemuCaps);
     virObjectUnref(cfg);
     return ret;
 }
@@ -3573,13 +3564,6 @@ qemuDomainDeviceDefPostParse(virDomainDeviceDefPtr dev,
     virQEMUDriverConfigPtr cfg = virQEMUDriverGetConfig(driver);
     int ret = -1;
 
-    if (qemuCaps) {
-        virObjectRef(qemuCaps);
-    } else {
-        qemuCaps = virQEMUCapsCacheLookup(driver->qemuCapsCache,
-                                          def->emulator);
-    }
-
     if (dev->type == VIR_DOMAIN_DEVICE_NET &&
         dev->data.net->type != VIR_DOMAIN_NET_TYPE_HOSTDEV &&
         !dev->data.net->model) {
@@ -3688,7 +3672,6 @@ qemuDomainDeviceDefPostParse(virDomainDeviceDefPtr dev,
     ret = 0;
 
  cleanup:
-    virObjectUnref(qemuCaps);
     virObjectUnref(cfg);
     return ret;
 }
@@ -3703,29 +3686,42 @@ qemuDomainDefAssignAddresses(virDomainDef *def,
 {
     virQEMUDriverPtr driver = opaque;
     virQEMUCapsPtr qemuCaps = parseOpaque;
-    int ret = -1;
     bool newDomain = parseFlags & VIR_DOMAIN_DEF_PARSE_ABI_UPDATE;
 
-    if (qemuCaps) {
-        virObjectRef(qemuCaps);
-    } else {
-        if (!(qemuCaps = virQEMUCapsCacheLookup(driver->qemuCapsCache,
+    return qemuDomainAssignAddresses(def, qemuCaps, driver, NULL, newDomain);
+}
+
+
+static int
+qemuDomainPostParseDataAlloc(const virDomainDef *def,
+                             virCapsPtr caps ATTRIBUTE_UNUSED,
+                             unsigned int parseFlags ATTRIBUTE_UNUSED,
+                             void *opaque,
+                             void **parseOpaque)
+{
+    virQEMUDriverPtr driver = opaque;
+
+    if (!(*parseOpaque = virQEMUCapsCacheLookup(driver->qemuCapsCache,
                                                 def->emulator)))
-            goto cleanup;
-    }
+        return -1;
 
-    if (qemuDomainAssignAddresses(def, qemuCaps, driver, NULL, newDomain) < 0)
-        goto cleanup;
+    return 0;
+}
+
+
+static void
+qemuDomainPostParseDataFree(void *parseOpaque)
+{
+    virQEMUCapsPtr qemuCaps = parseOpaque;
 
-    ret = 0;
- cleanup:
     virObjectUnref(qemuCaps);
-    return ret;
 }
 
 
 virDomainDefParserConfig virQEMUDriverDomainDefParserConfig = {
     .domainPostParseBasicCallback = qemuDomainDefPostParseBasic,
+    .domainPostParseDataAlloc = qemuDomainPostParseDataAlloc,
+    .domainPostParseDataFree = qemuDomainPostParseDataFree,
     .devicesPostParseCallback = qemuDomainDeviceDefPostParse,
     .domainPostParseCallback = qemuDomainDefPostParse,
     .assignAddressesCallback = qemuDomainDefAssignAddresses,