[libvirt] [PATCHv3] conf: Add the cpu duplicate use check for vm numa settings

[Luyao Huang]

https://bugzilla.redhat.com/show_bug.cgi?id=1176020

We had a check for the vcpu count total number in <numa>
before, however this check is not good enough. There are
some examples:

1. one of cpu id is out of maxvcpus, can set success(cpu count = 5 < 10):

<vcpu placement='static'>10</vcpu>
<cell id='0' cpus='0-3,100' memory='512000' unit='KiB'/>

2. use the same cpu in 2 cell, can set success(cpu count = 8 < 10):
<vcpu placement='static'>10</vcpu>
<cell id='0' cpus='0-3' memory='512000' unit='KiB'/>
<cell id='1' cpus='0-3' memory='512000' unit='KiB'/>

3. use the same cpu in 2 cell, cannot set success(cpu count = 11 > 10):
<vcpu placement='static'>10</vcpu>
<cell id='0' cpus='0-6' memory='512000' unit='KiB'/>
<cell id='1' cpus='0-3' memory='512000' unit='KiB'/>

Add a check for numa cpus, check if duplicate use one cpu in more
than one cell.

Signed-off-by: Luyao Huang <lhuang at redhat.com>
---
v3: remove the max vcpu check, just add a check when
parse the numa settings, and change the subject.

 src/conf/numa_conf.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/conf/numa_conf.c b/src/conf/numa_conf.c
index 7ad3f66..e25d7a8 100644
--- a/src/conf/numa_conf.c
+++ b/src/conf/numa_conf.c
@@ -738,6 +738,15 @@ virDomainNumaDefCPUParseXML(virDomainNumaPtr def,
         }
         VIR_FREE(tmp);
 
+        for (j = 0; j < i; j++) {
+            if (virBitmapOverlaps(def->mem_nodes[j].cpumask,
+                                  def->mem_nodes[i].cpumask)) {
+                virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                               _("NUMA cells %zu and %zu have overlapping vCPU ids"), i, j);
+                goto cleanup;
+            }
+        }
+
         ctxt->node = nodes[i];
         if (virDomainParseMemory("./@memory", "./@unit", ctxt,
                                  &def->mem_nodes[cur_cell].mem, true, false) < 0)
-- 
1.8.3.1