numa_conf.c: add helper functions for cpumap operations

These helpers will be used in an auto-fill feature for incomplete
NUMA topologies in the next patch.
Signed-off-by: NDaniel Henrique Barboza <danielhb413@gmail.com>
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
Reviewed-by: NMichal Privoznik <mprivozn@redhat.com>

src/conf/numa_conf.c

@@ -1372,3 +1372,34 @@ virDomainNumaGetMemorySize(virDomainNumaPtr numa)
 
     return ret;
 }
+
+
+int
+virDomainNumaFillCPUsInNode(virDomainNumaPtr numa,
+                            size_t node,
+                            unsigned int maxCpus)
+{
+    g_autoptr(virBitmap) maxCPUsBitmap = virBitmapNew(maxCpus);
+    size_t i;
+
+    if (node >= virDomainNumaGetNodeCount(numa))
+        return -1;
+
+    virBitmapSetAll(maxCPUsBitmap);
+
+    for (i = 0; i < numa->nmem_nodes; i++) {
+        virBitmapPtr nodeCpus = virDomainNumaGetNodeCpumask(numa, i);
+
+        if (i == node)
+            continue;
+
+        virBitmapSubtract(maxCPUsBitmap, nodeCpus);
+    }
+
+    if (!virBitmapEqual(numa->mem_nodes[node].cpumask, maxCPUsBitmap)) {
+        virBitmapFree(numa->mem_nodes[node].cpumask);
+        numa->mem_nodes[node].cpumask = g_steal_pointer(&maxCPUsBitmap);
+    }
+
+    return 0;
+}

src/conf/numa_conf.h

@@ -185,3 +185,6 @@ int virDomainNumaDefCPUParseXML(virDomainNumaPtr def, xmlXPathContextPtr ctxt);
 int virDomainNumaDefCPUFormatXML(virBufferPtr buf, virDomainNumaPtr def);
 
 unsigned int virDomainNumaGetCPUCountTotal(virDomainNumaPtr numa);
+
+int virDomainNumaFillCPUsInNode(virDomainNumaPtr numa, size_t node,
+                                unsigned int maxCpus);

src/libvirt_private.syms

@@ -834,6 +834,7 @@ virDomainMemoryAccessTypeFromString;
 virDomainMemoryAccessTypeToString;
 virDomainNumaCheckABIStability;
 virDomainNumaEquals;
+virDomainNumaFillCPUsInNode;
 virDomainNumaFree;
 virDomainNumaGetCPUCountTotal;
 virDomainNumaGetMaxCPUID;