[libvirt] [PATCH 3/3] conf: numa: Check ABI stability of NUMA configuration

[Peter Krempa]

Add helper to compare initial sizes of indivitual NUMA nodes and the map
of belonging vCPUs. Other configuration is not ABI.
---
 src/conf/domain_conf.c   |  3 +++
 src/conf/numa_conf.c     | 37 +++++++++++++++++++++++++++++++++++++
 src/conf/numa_conf.h     |  3 +++
 src/libvirt_private.syms |  1 +
 4 files changed, 44 insertions(+)

diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index eee01b6..15d4fe0 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -15964,6 +15964,9 @@ virDomainDefCheckABIStability(virDomainDefPtr src,
         goto error;
     }

+    if (!virDomainNumaCheckABIStability(src->numa, dst->numa))
+        goto error;
+
     if (src->vcpus != dst->vcpus) {
         virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                        _("Target domain vCPU count %d does not match source %d"),
diff --git a/src/conf/numa_conf.c b/src/conf/numa_conf.c
index 0a6f902..70044d5 100644
--- a/src/conf/numa_conf.c
+++ b/src/conf/numa_conf.c
@@ -814,6 +814,43 @@ virDomainNumaNew(void)
 }


+bool
+virDomainNumaCheckABIStability(virDomainNumaPtr src,
+                               virDomainNumaPtr tgt)
+{
+    size_t i;
+
+    if (virDomainNumaGetNodeCount(src) != virDomainNumaGetNodeCount(tgt)) {
+        virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                       _("Target NUMA node count '%zu' doesn't match "
+                         "source '%zu'"),
+                       virDomainNumaGetNodeCount(tgt),
+                       virDomainNumaGetNodeCount(src));
+        return false;
+    }
+
+    for (i = 0; i < virDomainNumaGetNodeCount(src); i++) {
+        if (src->mem_nodes[i].mem != tgt->mem_nodes[i].mem) {
+            virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                           _("Size of target NUMA node %zu (%llu) doesn't "
+                             "match source (%llu)"), i,
+                           tgt->mem_nodes[i].mem, src->mem_nodes[i].mem);
+            return false;
+        }
+
+        if (!virBitmapEqual(src->mem_nodes[i].cpumask,
+                            tgt->mem_nodes[i].cpumask)) {
+            virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                           _("Processor mask of target NUMA node %zu doesn't "
+                             "match source"), i);
+            return false;
+        }
+    }
+
+    return true;
+}
+
+
 size_t
 virDomainNumaGetNodeCount(virDomainNumaPtr numa)
 {
diff --git a/src/conf/numa_conf.h b/src/conf/numa_conf.h
index 8b3c437..23265af 100644
--- a/src/conf/numa_conf.h
+++ b/src/conf/numa_conf.h
@@ -125,6 +125,9 @@ void virDomainNumaSetNodeMemorySize(virDomainNumaPtr numa,
 bool virDomainNumaEquals(virDomainNumaPtr n1,
                          virDomainNumaPtr n2);

+bool virDomainNumaCheckABIStability(virDomainNumaPtr src,
+                                    virDomainNumaPtr tgt);
+
 bool virDomainNumatuneHasPlacementAuto(virDomainNumaPtr numatune);

 bool virDomainNumatuneHasPerNodeBinding(virDomainNumaPtr numatune);
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 8988b61..c02e089 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -627,6 +627,7 @@ virNodeDeviceObjUnlock;


 # conf/numa_conf.h
+virDomainNumaCheckABIStability;
 virDomainNumaEquals;
 virDomainNumaFree;
 virDomainNumaGetNodeCount;
-- 
2.2.2