conf: Add helper to retrieve bitmap of active vcpus for a definition

In some cases it may be better to have a bitmap representing state of
individual vcpus rather than iterating the definition. The new helper
creates a bitmap representing the state from the domain definition.

src/conf/domain_conf.c

@@ -1374,6 +1374,30 @@ virDomainDefGetVcpus(const virDomainDef *def)
 }
 
 
+/**
+ * virDomainDefGetOnlineVcpumap:
+ * @def: domain definition
+ *
+ * Returns a bitmap representing state of individual vcpus.
+ */
+virBitmapPtr
+virDomainDefGetOnlineVcpumap(const virDomainDef *def)
+{
+    virBitmapPtr ret = NULL;
+    size_t i;
+
+    if (!(ret = virBitmapNew(def->maxvcpus)))
+        return NULL;
+
+    for (i = 0; i < def->maxvcpus; i++) {
+        if (def->vcpus[i].online)
+            ignore_value(virBitmapSetBit(ret, i));
+    }
+
+    return ret;
+}
+
+
 virDomainVcpuInfoPtr
 virDomainDefGetVcpu(virDomainDefPtr def,
                     unsigned int vcpu)

src/conf/domain_conf.h

@@ -2358,6 +2358,7 @@ bool virDomainDefHasVcpusOffline(const virDomainDef *def);
 unsigned int virDomainDefGetVcpusMax(const virDomainDef *def);
 int virDomainDefSetVcpus(virDomainDefPtr def, unsigned int vcpus);
 unsigned int virDomainDefGetVcpus(const virDomainDef *def);
+virBitmapPtr virDomainDefGetOnlineVcpumap(const virDomainDef *def);
 virDomainVcpuInfoPtr virDomainDefGetVcpu(virDomainDefPtr def, unsigned int vcpu)
     ATTRIBUTE_RETURN_CHECK;
 

src/libvirt_private.syms

@@ -217,6 +217,7 @@ virDomainDefFree;
 virDomainDefGetDefaultEmulator;
 virDomainDefGetMemoryActual;
 virDomainDefGetMemoryInitial;
+virDomainDefGetOnlineVcpumap;
 virDomainDefGetSecurityLabelDef;
 virDomainDefGetVcpu;
 virDomainDefGetVcpus;