numa_conf: Introduce virDomainNumaGetMaxCPUID

This function should return the greatest CPU number set in
/domain/cpu/numa/cell/@cpus. The idea is that we should compare
the returned value against /domain/vcpu value. Yes, there exist
users who think the following is a good idea:

  <vcpu placement='static'>4</vcpu>
  <cpu mode='host-model'>
    <model fallback='allow'/>
    <numa>
      <cell id='0' cpus='0-1' memory='1048576' unit='KiB'/>
      <cell id='1' cpus='9-10' memory='2097152' unit='KiB'/>
    </numa>
  </cpu>

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>

src/conf/numa_conf.c

@@ -847,6 +847,23 @@ virDomainNumaGetCPUCountTotal(virDomainNumaPtr numa)
     return ret;
 }
 
+unsigned int
+virDomainNumaGetMaxCPUID(virDomainNumaPtr numa)
+{
+    size_t i;
+    unsigned int ret = 0;
+
+    for (i = 0; i < numa->nmem_nodes; i++) {
+        int bit;
+
+        bit = virBitmapLastSetBit(virDomainNumaGetNodeCpumask(numa, i));
+        if (bit > ret)
+            ret = bit;
+    }
+
+    return ret;
+}
+
 
 virDomainNumaPtr
 virDomainNumaNew(void)

src/conf/numa_conf.h

@@ -99,6 +99,9 @@ unsigned long long virDomainNumaGetNodeMemorySize(virDomainNumaPtr numa,
 unsigned long long virDomainNumaGetMemorySize(virDomainNumaPtr numa)
     ATTRIBUTE_NONNULL(1);
 
+unsigned int
+virDomainNumaGetMaxCPUID(virDomainNumaPtr numa);
+
 /*
  * Formatters
  */

src/libvirt_private.syms

@@ -679,6 +679,7 @@ virNodeDeviceObjUnlock;
 virDomainNumaCheckABIStability;
 virDomainNumaEquals;
 virDomainNumaFree;
+virDomainNumaGetMaxCPUID;
 virDomainNumaGetMemorySize;
 virDomainNumaGetNodeCount;
 virDomainNumaGetNodeCpumask;