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[libvirt] [PATCH 02/15] conf: Refactor virCPUDefParseXML



Signed-off-by: Jiri Denemark <jdenemar redhat com>
---
 src/conf/cpu_conf.c    | 105 +++++++++++++++++++++++++++----------------------
 src/conf/cpu_conf.h    |   9 +++--
 src/conf/domain_conf.c |  12 +-----
 src/cpu/cpu.c          |   5 +--
 tests/cputest.c        |   5 +--
 5 files changed, 68 insertions(+), 68 deletions(-)

diff --git a/src/conf/cpu_conf.c b/src/conf/cpu_conf.c
index 79ed5e646..f7f726761 100644
--- a/src/conf/cpu_conf.c
+++ b/src/conf/cpu_conf.c
@@ -245,12 +245,21 @@ virCPUDefCopy(const virCPUDef *cpu)
 }
 
 
-virCPUDefPtr
-virCPUDefParseXML(xmlNodePtr node,
-                  xmlXPathContextPtr ctxt,
-                  virCPUType type)
+/*
+ * Parses CPU definition XML from a node pointed to by @xpath. If @xpath is
+ * NULL, the current node of @ctxt is used (i.e., it is a shortcut to ".").
+ *
+ * Returns  0 on success,
+ *          1 when @xpath element cannot be found in @ctxt,
+ *         -1 on error.
+ */
+int
+virCPUDefParseXML(xmlXPathContextPtr ctxt,
+                  const char *xpath,
+                  virCPUType type,
+                  virCPUDefPtr *cpu)
 {
-    virCPUDefPtr def;
+    virCPUDefPtr def = NULL;
     xmlNodePtr *nodes = NULL;
     xmlNodePtr oldnode = ctxt->node;
     int n;
@@ -258,15 +267,23 @@ virCPUDefParseXML(xmlNodePtr node,
     char *cpuMode;
     char *fallback = NULL;
     char *vendor_id = NULL;
+    int ret = -1;
 
-    if (!xmlStrEqual(node->name, BAD_CAST "cpu")) {
+    *cpu = NULL;
+
+    if (xpath && !(ctxt->node = virXPathNode(xpath, ctxt))) {
+        ret = 1;
+        goto cleanup;
+    }
+
+    if (!xmlStrEqual(ctxt->node->name, BAD_CAST "cpu")) {
         virReportError(VIR_ERR_XML_ERROR, "%s",
                        _("XML does not contain expected 'cpu' element"));
-        return NULL;
+        goto cleanup;
     }
 
     if (VIR_ALLOC(def) < 0)
-        return NULL;
+        goto cleanup;
 
     if (type == VIR_CPU_TYPE_AUTO) {
         if (virXPathBoolean("boolean(./arch)", ctxt)) {
@@ -274,7 +291,7 @@ virCPUDefParseXML(xmlNodePtr node,
                 virReportError(VIR_ERR_XML_ERROR, "%s",
                                _("'arch' element cannot be used inside 'cpu'"
                                  " element with 'match' attribute'"));
-                goto error;
+                goto cleanup;
             }
             def->type = VIR_CPU_TYPE_HOST;
         } else {
@@ -284,12 +301,12 @@ virCPUDefParseXML(xmlNodePtr node,
         def->type = type;
     }
 
-    if ((cpuMode = virXMLPropString(node, "mode"))) {
+    if ((cpuMode = virXMLPropString(ctxt->node, "mode"))) {
         if (def->type == VIR_CPU_TYPE_HOST) {
             VIR_FREE(cpuMode);
             virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
                            _("Attribute mode is only allowed for guest CPU"));
-            goto error;
+            goto cleanup;
         } else {
             def->mode = virCPUModeTypeFromString(cpuMode);
 
@@ -298,7 +315,7 @@ virCPUDefParseXML(xmlNodePtr node,
                                _("Invalid mode attribute '%s'"),
                                cpuMode);
                 VIR_FREE(cpuMode);
-                goto error;
+                goto cleanup;
             }
             VIR_FREE(cpuMode);
         }
@@ -310,7 +327,7 @@ virCPUDefParseXML(xmlNodePtr node,
     }
 
     if (def->type == VIR_CPU_TYPE_GUEST) {
-        char *match = virXMLPropString(node, "match");
+        char *match = virXMLPropString(ctxt->node, "match");
         char *check;
 
         if (!match) {
@@ -326,11 +343,11 @@ virCPUDefParseXML(xmlNodePtr node,
                 virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
                                _("Invalid match attribute for CPU "
                                  "specification"));
-                goto error;
+                goto cleanup;
             }
         }
 
-        if ((check = virXMLPropString(node, "check"))) {
+        if ((check = virXMLPropString(ctxt->node, "check"))) {
             int value = virCPUCheckTypeFromString(check);
             VIR_FREE(check);
 
@@ -338,7 +355,7 @@ virCPUDefParseXML(xmlNodePtr node,
                 virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
                                _("Invalid check attribute for CPU "
                                  "specification"));
-                goto error;
+                goto cleanup;
             }
             def->check = value;
         }
@@ -349,13 +366,13 @@ virCPUDefParseXML(xmlNodePtr node,
         if (!arch) {
             virReportError(VIR_ERR_XML_ERROR, "%s",
                            _("Missing CPU architecture"));
-            goto error;
+            goto cleanup;
         }
         if ((def->arch = virArchFromString(arch)) == VIR_ARCH_NONE) {
             virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                            _("Unknown architecture %s"), arch);
             VIR_FREE(arch);
-            goto error;
+            goto cleanup;
         }
         VIR_FREE(arch);
     }
@@ -364,7 +381,7 @@ virCPUDefParseXML(xmlNodePtr node,
         def->type == VIR_CPU_TYPE_HOST) {
         virReportError(VIR_ERR_XML_ERROR, "%s",
                         _("Missing CPU model name"));
-        goto error;
+        goto cleanup;
     }
 
     if (def->type == VIR_CPU_TYPE_GUEST &&
@@ -374,7 +391,7 @@ virCPUDefParseXML(xmlNodePtr node,
             if ((def->fallback = virCPUFallbackTypeFromString(fallback)) < 0) {
                 virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
                                _("Invalid fallback attribute"));
-                goto error;
+                goto cleanup;
             }
         }
 
@@ -384,14 +401,14 @@ virCPUDefParseXML(xmlNodePtr node,
                 virReportError(VIR_ERR_XML_ERROR,
                                _("vendor_id must be exactly %d characters long"),
                                VIR_CPU_VENDOR_ID_LENGTH);
-                goto error;
+                goto cleanup;
             }
 
             /* ensure that the string can be passed to qemu*/
             if (strchr(vendor_id, ',')) {
                     virReportError(VIR_ERR_XML_ERROR, "%s",
                                    _("vendor id is invalid"));
-                    goto error;
+                    goto cleanup;
             }
 
             def->vendor_id = vendor_id;
@@ -403,61 +420,54 @@ virCPUDefParseXML(xmlNodePtr node,
     if (def->vendor && !def->model) {
         virReportError(VIR_ERR_XML_ERROR, "%s",
                        _("CPU vendor specified without CPU model"));
-        goto error;
+        goto cleanup;
     }
 
     if (virXPathNode("./topology[1]", ctxt)) {
-        int ret;
         unsigned long ul;
 
-        ret = virXPathULong("string(./topology[1]/@sockets)",
-                            ctxt, &ul);
-        if (ret < 0) {
+        if (virXPathULong("string(./topology[1]/@sockets)", ctxt, &ul) < 0) {
             virReportError(VIR_ERR_XML_ERROR, "%s",
                            _("Missing 'sockets' attribute in CPU topology"));
-            goto error;
+            goto cleanup;
         }
         def->sockets = (unsigned int) ul;
 
-        ret = virXPathULong("string(./topology[1]/@cores)",
-                            ctxt, &ul);
-        if (ret < 0) {
+        if (virXPathULong("string(./topology[1]/@cores)", ctxt, &ul) < 0) {
             virReportError(VIR_ERR_XML_ERROR, "%s",
                            _("Missing 'cores' attribute in CPU topology"));
-            goto error;
+            goto cleanup;
         }
         def->cores = (unsigned int) ul;
 
-        ret = virXPathULong("string(./topology[1]/@threads)",
-                            ctxt, &ul);
-        if (ret < 0) {
+        if (virXPathULong("string(./topology[1]/@threads)", ctxt, &ul) < 0) {
             virReportError(VIR_ERR_XML_ERROR, "%s",
                            _("Missing 'threads' attribute in CPU topology"));
-            goto error;
+            goto cleanup;
         }
         def->threads = (unsigned int) ul;
 
         if (!def->sockets || !def->cores || !def->threads) {
             virReportError(VIR_ERR_XML_ERROR, "%s",
                            _("Invalid CPU topology"));
-            goto error;
+            goto cleanup;
         }
     }
 
     if ((n = virXPathNodeSet("./feature", ctxt, &nodes)) < 0)
-        goto error;
+        goto cleanup;
 
     if (n > 0) {
         if (!def->model && def->mode == VIR_CPU_MODE_CUSTOM) {
             virReportError(VIR_ERR_XML_ERROR, "%s",
                            _("Non-empty feature list specified without "
                              "CPU model"));
-            goto error;
+            goto cleanup;
         }
 
         if (VIR_RESIZE_N(def->features, def->nfeatures_max,
                          def->nfeatures, n) < 0)
-            goto error;
+            goto cleanup;
 
         def->nfeatures = n;
     }
@@ -480,7 +490,7 @@ virCPUDefParseXML(xmlNodePtr node,
             if (policy < 0) {
                 virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
                                _("Invalid CPU feature policy"));
-                goto error;
+                goto cleanup;
             }
         } else {
             policy = -1;
@@ -490,7 +500,7 @@ virCPUDefParseXML(xmlNodePtr node,
             VIR_FREE(name);
             virReportError(VIR_ERR_XML_ERROR, "%s",
                            _("Invalid CPU feature name"));
-            goto error;
+            goto cleanup;
         }
 
         for (j = 0; j < i; j++) {
@@ -499,7 +509,7 @@ virCPUDefParseXML(xmlNodePtr node,
                                _("CPU feature '%s' specified more than once"),
                                name);
                 VIR_FREE(name);
-                goto error;
+                goto cleanup;
             }
         }
 
@@ -542,17 +552,16 @@ virCPUDefParseXML(xmlNodePtr node,
         def->cache->mode = mode;
     }
 
+    VIR_STEAL_PTR(*cpu, def);
+    ret = 0;
+
  cleanup:
     ctxt->node = oldnode;
     VIR_FREE(fallback);
     VIR_FREE(vendor_id);
     VIR_FREE(nodes);
-    return def;
-
- error:
     virCPUDefFree(def);
-    def = NULL;
-    goto cleanup;
+    return ret;
 }
 
 
diff --git a/src/conf/cpu_conf.h b/src/conf/cpu_conf.h
index b0d891552..b44974f47 100644
--- a/src/conf/cpu_conf.h
+++ b/src/conf/cpu_conf.h
@@ -182,10 +182,11 @@ virCPUDefCopy(const virCPUDef *cpu);
 virCPUDefPtr
 virCPUDefCopyWithoutModel(const virCPUDef *cpu);
 
-virCPUDefPtr
-virCPUDefParseXML(xmlNodePtr node,
-                  xmlXPathContextPtr ctxt,
-                  virCPUType mode);
+int
+virCPUDefParseXML(xmlXPathContextPtr ctxt,
+                  const char *xpath,
+                  virCPUType mode,
+                  virCPUDefPtr *cpu);
 
 bool
 virCPUDefIsEqual(virCPUDefPtr src,
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index a61d293c9..7144914cf 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -17444,16 +17444,8 @@ virDomainDefParseXML(xmlDocPtr xml,
     }
     VIR_FREE(nodes);
 
-    /* analysis of cpu handling */
-    if ((node = virXPathNode("./cpu[1]", ctxt)) != NULL) {
-        xmlNodePtr oldnode = ctxt->node;
-        ctxt->node = node;
-        def->cpu = virCPUDefParseXML(node, ctxt, VIR_CPU_TYPE_GUEST);
-        ctxt->node = oldnode;
-
-        if (def->cpu == NULL)
-            goto error;
-    }
+    if (virCPUDefParseXML(ctxt, "./cpu[1]", VIR_CPU_TYPE_GUEST, &def->cpu) < 0)
+        goto error;
 
     if (virDomainNumaDefCPUParseXML(def->numa, ctxt) < 0)
         goto error;
diff --git a/src/cpu/cpu.c b/src/cpu/cpu.c
index 702b14dbb..96160901e 100644
--- a/src/cpu/cpu.c
+++ b/src/cpu/cpu.c
@@ -130,7 +130,7 @@ virCPUCompareXML(virArch arch,
     if (!(doc = virXMLParseStringCtxt(xml, _("(CPU_definition)"), &ctxt)))
         goto cleanup;
 
-    if (!(cpu = virCPUDefParseXML(ctxt->node, ctxt, VIR_CPU_TYPE_AUTO)))
+    if (virCPUDefParseXML(ctxt, NULL, VIR_CPU_TYPE_AUTO, &cpu) < 0)
         goto cleanup;
 
     ret = virCPUCompare(arch, host, cpu, failIncompatible);
@@ -562,8 +562,7 @@ cpuBaselineXML(const char **xmlCPUs,
         if (!(doc = virXMLParseStringCtxt(xmlCPUs[i], _("(CPU_definition)"), &ctxt)))
             goto error;
 
-        cpus[i] = virCPUDefParseXML(ctxt->node, ctxt, VIR_CPU_TYPE_HOST);
-        if (cpus[i] == NULL)
+        if (virCPUDefParseXML(ctxt, NULL, VIR_CPU_TYPE_HOST, &cpus[i]) < 0)
             goto error;
 
         xmlXPathFreeContext(ctxt);
diff --git a/tests/cputest.c b/tests/cputest.c
index d5e023c40..89c645e64 100644
--- a/tests/cputest.c
+++ b/tests/cputest.c
@@ -88,7 +88,7 @@ cpuTestLoadXML(virArch arch, const char *name)
     if (!(doc = virXMLParseFileCtxt(xml, &ctxt)))
         goto cleanup;
 
-    cpu = virCPUDefParseXML(ctxt->node, ctxt, VIR_CPU_TYPE_AUTO);
+    virCPUDefParseXML(ctxt, NULL, VIR_CPU_TYPE_AUTO, &cpu);
 
  cleanup:
     xmlXPathFreeContext(ctxt);
@@ -126,8 +126,7 @@ cpuTestLoadMultiXML(virArch arch,
 
     for (i = 0; i < n; i++) {
         ctxt->node = nodes[i];
-        cpus[i] = virCPUDefParseXML(nodes[i], ctxt, VIR_CPU_TYPE_HOST);
-        if (!cpus[i])
+        if (virCPUDefParseXML(ctxt, NULL, VIR_CPU_TYPE_HOST, &cpus[i]) < 0)
             goto cleanup_cpus;
     }
 
-- 
2.13.0


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