[libvirt] [PATCH 1/1] Added check for maximum number of vcpus exceeding topology limit

[Martin Kletzander]

Earlier, when the number of vcpus was greater than the topology allowed,
libvirt didn't raise an error and continued, resulting in running qemu
with parameters making no sense. Even though qemu did not report any
error itself, the number of vcpus was set to maximum allowed by the
topology.
---
 src/conf/domain_conf.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 180dd2b..06ddd02 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -8010,6 +8010,13 @@ static virDomainDefPtr virDomainDefParseXML(virCapsPtr caps,
         if (def->cpu == NULL)
             goto error;

+        if (def->maxvcpus >
+            def->cpu->sockets * def->cpu->cores * def->cpu->threads) {
+            virDomainReportError(VIR_ERR_XML_DETAIL, "%s",
+                                 _("Maximum CPUs greater than topology limit"));
+            goto error;
+        }
+
         if (def->cpu->cells_cpus > def->maxvcpus) {
             virDomainReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                                  _("Number of CPUs in <numa> exceeds the"
-- 
1.7.3.4