[libvirt] [PATCH v2 13/17] conf: Factor out vcpus overlapping from virDomainCachetuneDefParse

[bing.niu at intel.com]

From: Bing Niu <bing.niu at intel.com>

Factor out vcpus overlapping detecting part from
virDomainCachetuneDefParse and introduce virDomainResctrlVcpuMatch.
Instead of allocating virResctrlAllocPtr by default, allocating
virResctrlAllocPtr after confirm vcpus not overlap with existing ones.
And virDomainResctrlVcpuMatch can be reused by other resource control
technologies. virDomainResctrlVcpuMatch can clarify old vcpus overlap
error whether an overlap or a redefinition.

Signed-off-by: Bing Niu <bing.niu at intel.com>
---
 src/conf/domain_conf.c | 51 ++++++++++++++++++++++++++++++++++++++------------
 1 file changed, 39 insertions(+), 12 deletions(-)

diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index d6314de..da8681d 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -18983,6 +18983,31 @@ virDomainResctrlParseVcpus(virDomainDefPtr def,
 
 
 static int
+virDomainResctrlVcpuMatch(virDomainDefPtr def,
+                          virBitmapPtr vcpus,
+                          virResctrlAllocPtr *alloc)
+{
+    ssize_t i = 0;
+
+    for (i = 0; i < def->nresctrls; i++) {
+        /* vcpus group has been created, directly use the existing one.
+         * Just updating memory allocation information of that group
+         */
+        if (virBitmapEqual(def->resctrls[i]->vcpus, vcpus)) {
+            *alloc = def->resctrls[i]->alloc;
+            break;
+        }
+        if (virBitmapOverlaps(def->resctrls[i]->vcpus, vcpus)) {
+            virReportError(VIR_ERR_XML_ERROR, "%s",
+                           _("Overlapping vcpus in resctrls"));
+            return -1;
+        }
+    }
+    return 0;
+}
+
+
+static int
 virDomainCachetuneDefParseCache(xmlXPathContextPtr ctxt,
                                 xmlNodePtr node,
                                 virResctrlAllocPtr alloc)
@@ -19065,7 +19090,7 @@ virDomainCachetuneDefParse(virDomainDefPtr def,
     xmlNodePtr oldnode = ctxt->node;
     xmlNodePtr *nodes = NULL;
     virBitmapPtr vcpus = NULL;
-    virResctrlAllocPtr alloc = virResctrlAllocNew();
+    virResctrlAllocPtr alloc = NULL;
     virDomainResctrlDefPtr tmp_resctrl = NULL;
     char *tmp = NULL;
     char *vcpus_str = NULL;
@@ -19076,9 +19101,6 @@ virDomainCachetuneDefParse(virDomainDefPtr def,
 
     ctxt->node = node;
 
-    if (!alloc)
-        goto cleanup;
-
     if (VIR_ALLOC(tmp_resctrl) < 0)
         goto cleanup;
 
@@ -19096,6 +19118,19 @@ virDomainCachetuneDefParse(virDomainDefPtr def,
         goto cleanup;
     }
 
+    if (virDomainResctrlVcpuMatch(def, vcpus, &alloc) < 0)
+        goto cleanup;
+
+    if (!alloc) {
+        alloc = virResctrlAllocNew();
+        if (!alloc)
+            goto cleanup;
+    } else {
+        virReportError(VIR_ERR_XML_ERROR, "%s",
+                       _("Identical vcpus in cachetunes found"));
+        goto cleanup;
+    }
+
     for (i = 0; i < n; i++) {
         if (virDomainCachetuneDefParseCache(ctxt, nodes[i], alloc) < 0)
             goto cleanup;
@@ -19106,14 +19141,6 @@ virDomainCachetuneDefParse(virDomainDefPtr def,
         goto cleanup;
     }
 
-    for (i = 0; i < def->nresctrls; i++) {
-        if (virBitmapOverlaps(def->resctrls[i]->vcpus, vcpus)) {
-            virReportError(VIR_ERR_XML_ERROR, "%s",
-                           _("Overlapping vcpus in cachetunes"));
-            goto cleanup;
-        }
-    }
-
     /* We need to format it back because we need to be consistent in the naming
      * even when users specify some "sub-optimal" string there. */
     VIR_FREE(vcpus_str);
-- 
2.7.4