[libvirt] [PATCH 2/2] conf: rework the cpu check for vm numa settings
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'/>
Use a new check for numa cpus, check if use a cpu exceeds maxvcpus
and if duplicate use one cpu in more than one cell.
Signed-off-by: Luyao Huang <lhuang(a)redhat.com>
---
src/conf/domain_conf.c | 12 ++++--------
src/conf/numa_conf.c | 37 ++++++++++++++++++++++++++++++-------
src/conf/numa_conf.h | 2 +-
3 files changed, 35 insertions(+), 16 deletions(-)
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 831f033..3a5eb1f 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -13510,7 +13510,10 @@ virDomainThreadSchedParse(xmlNodePtr node,
static int
virDomainDefNewCheck(virDomainDefPtr def)
{
- /*TO DO*/
+ if (def->numa &&
+ (virDomainNumaCheckCPU(def->numa, def->maxvcpus) < 0))
+ return -1;
+
return 0;
}
@@ -14141,13 +14144,6 @@ virDomainDefParseXML(xmlDocPtr xml,
if (virDomainNumaDefCPUParseXML(def->numa, ctxt) < 0)
goto error;
- if (virDomainNumaGetCPUCountTotal(def->numa) > def->maxvcpus) {
- virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
- _("Number of CPUs in <numa> exceeds the"
- " <vcpu> count"));
- goto error;
- }
-
if (virDomainNumatuneParseXML(def->numa,
def->placement_mode ==
VIR_DOMAIN_CPU_PLACEMENT_MODE_STATIC,
diff --git a/src/conf/numa_conf.c b/src/conf/numa_conf.c
index 8a0f686..0191a22 100644
--- a/src/conf/numa_conf.c
+++ b/src/conf/numa_conf.c
@@ -790,16 +790,39 @@ virDomainNumaDefCPUFormat(virBufferPtr buf,
}
-unsigned int
-virDomainNumaGetCPUCountTotal(virDomainNumaPtr numa)
+int
+virDomainNumaCheckCPU(virDomainNumaPtr numa,
+ unsigned short maxvcpus)
{
- size_t i;
- unsigned int ret = 0;
+ size_t i,j;
- for (i = 0; i < numa->nmem_nodes; i++)
- ret += virBitmapCountBits(virDomainNumaGetNodeCpumask(numa, i));
+ for (i = 0; i < numa->nmem_nodes; i++) {
+ virBitmapPtr nodeset = NULL;
+ ssize_t bit = -1;
+
+ nodeset = virDomainNumaGetNodeCpumask(numa, i);
+ for (j = 0; j < i; j++) {
+ if (virBitmapOverlaps(virDomainNumaGetNodeCpumask(numa, j),
+ nodeset)) {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ _("Cannot binding one vCPU in 2 NUMA cell"
+ " %d and %d"), (int) i, (int) j);
+ return -1;
+ }
+ }
- return ret;
+ while ((bit = virBitmapNextSetBit(nodeset, bit)) >= 0) {
+ if (bit <= maxvcpus-1)
+ continue;
+
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ _("vcpu '%d' in <numa> cell '%d'
exceeds the maxvcpus"),
+ (int) bit, (int) i);
+ return -1;
+ }
+ }
+
+ return 0;
}
diff --git a/src/conf/numa_conf.h b/src/conf/numa_conf.h
index ded6e01..d7713c8 100644
--- a/src/conf/numa_conf.h
+++ b/src/conf/numa_conf.h
@@ -149,7 +149,7 @@ bool virDomainNumatuneNodeSpecified(virDomainNumaPtr numatune,
int virDomainNumaDefCPUParseXML(virDomainNumaPtr def, xmlXPathContextPtr ctxt);
int virDomainNumaDefCPUFormat(virBufferPtr buf, virDomainNumaPtr def);
-unsigned int virDomainNumaGetCPUCountTotal(virDomainNumaPtr numa);
+int virDomainNumaCheckCPU(virDomainNumaPtr numa, unsigned short maxvcpus);
#endif /* __NUMA_CONF_H__ */
--
1.8.3.1