numatune: setting --mode does not work well

When trying to set numatune mode directly using virsh numatune command,
correct error is raised, however numatune structure was not deallocated,
thus resulting in creating an empty numatune element in the guest XML,
if none was present before. Running the same command aftewards results
in a successful change with broken XML structure. Patch fixes the
deallocation problem as well as checking for invalid attribute
combination VIR_DOMAIN_NUMATUNE_PLACEMENT_AUTO + a nonempty nodeset.

Resolves https://bugzilla.redhat.com/show_bug.cgi?id=1129998

src/conf/numatune_conf.c

@@ -437,14 +437,27 @@ virDomainNumatuneSet(virDomainNumatunePtr *numatunePtr,
                      int mode,
                      virBitmapPtr nodeset)
 {
-    bool create = !*numatunePtr;  /* Whether we are creating new struct */
+    bool created = false;
     int ret = -1;
-    virDomainNumatunePtr numatune = NULL;
+    virDomainNumatunePtr numatune;
 
     /* No need to do anything in this case */
     if (mode == -1 && placement == -1 && !nodeset)
         return 0;
 
+    if (!(*numatunePtr)) {
+        if (VIR_ALLOC(*numatunePtr) < 0)
+            goto cleanup;
+
+        created = true;
+        if (mode == -1)
+            mode = VIR_DOMAIN_NUMATUNE_MEM_STRICT;
+        if (placement == -1)
+            placement = VIR_DOMAIN_NUMATUNE_PLACEMENT_DEFAULT;
+    }
+
+    numatune = *numatunePtr;
+
     /* Range checks */
     if (mode != -1 &&
         (mode < 0 || mode >= VIR_DOMAIN_NUMATUNE_MEM_LAST)) {
@@ -453,6 +466,7 @@ virDomainNumatuneSet(virDomainNumatunePtr *numatunePtr,
                        mode);
         goto cleanup;
     }
+
     if (placement != -1 &&
         (placement < 0 || placement >= VIR_DOMAIN_NUMATUNE_PLACEMENT_LAST)) {
         virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
@@ -461,21 +475,9 @@ virDomainNumatuneSet(virDomainNumatunePtr *numatunePtr,
         goto cleanup;
     }
 
-    if (create && VIR_ALLOC(*numatunePtr) < 0)
-        goto cleanup;
-    numatune = *numatunePtr;
-
-    if (create) {
-        /* Defaults for new struct */
-        if (mode == -1)
-            mode = VIR_DOMAIN_NUMATUNE_MEM_STRICT;
-
-        if (placement == -1)
-            placement = VIR_DOMAIN_NUMATUNE_PLACEMENT_DEFAULT;
-    }
-
     if (mode != -1)
         numatune->memory.mode = mode;
+
     if (nodeset) {
         virBitmapFree(numatune->memory.nodeset);
         numatune->memory.nodeset = virBitmapNewCopy(nodeset);
@@ -500,13 +502,26 @@ virDomainNumatuneSet(virDomainNumatunePtr *numatunePtr,
         goto cleanup;
     }
 
+    /* setting nodeset when placement auto is invalid */
+    if (placement == VIR_DOMAIN_NUMATUNE_PLACEMENT_AUTO &&
+        numatune->memory.nodeset) {
+        virBitmapFree(numatune->memory.nodeset);
+        numatune->memory.nodeset = NULL;
+    }
+
     if (placement != -1)
         numatune->memory.placement = placement;
 
     numatune->memory.specified = true;
 
     ret = 0;
+
  cleanup:
+    if (ret < 0 && created) {
+        virDomainNumatuneFree(*numatunePtr);
+        *numatunePtr = NULL;
+    }
+
     return ret;
 }
 

tests/qemuxml2argvdata/qemuxml2argv-numad-auto-vcpu-static-numatune-no-nodeset.xml

+<domain type='qemu'>
+  <name>QEMUGuest1</name>
+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+  <memory unit='KiB'>219136</memory>
+  <currentMemory unit='KiB'>219136</currentMemory>
+  <vcpu placement='auto'>2</vcpu>
+  <numatune>
+    <memory mode='interleave' placement='static'/>
+  </numatune>
+  <os>
+    <type arch='i686' machine='pc'>hvm</type>
+    <boot dev='hd'/>
+  </os>
+  <cpu>
+    <topology sockets='2' cores='1' threads='1'/>
+  </cpu>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+    <emulator>/usr/bin/qemu</emulator>
+    <disk type='block' device='disk'>
+      <source dev='/dev/HostVG/QEMUGuest1'/>
+      <target dev='hda' bus='ide'/>
+      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
+    </disk>
+    <controller type='ide' index='0'/>
+    <memballoon model='virtio'/>
+  </devices>
+</domain>

tests/qemuxml2argvtest.c

@@ -1223,6 +1223,7 @@ mymain(void)
     DO_TEST_PARSE_ERROR("numatune-memnodes-problematic", NONE);
     DO_TEST("numad", NONE);
     DO_TEST("numad-auto-vcpu-static-numatune", NONE);
+    DO_TEST_PARSE_ERROR("numad-auto-vcpu-static-numatune-no-nodeset", NONE);
     DO_TEST("numad-auto-memory-vcpu-cpuset", NONE);
     DO_TEST("numad-auto-memory-vcpu-no-cpuset-and-placement", NONE);
     DO_TEST("numad-static-memory-auto-vcpu", NONE);