[Qemu-devel] [PULL v6 06/12] numa: Introduce MachineClass::auto_enable_numa for implicit NUMA node

[Eduardo Habkost <ehabkost@redhat.com>]

From: Tao Xu <tao3.xu@intel.com>

Add MachineClass::auto_enable_numa field. When it is true, a NUMA node
is expected to be created implicitly.

Acked-by: David Gibson <david@gibson.dropbear.id.au>
Suggested-by: Igor Mammedov <imammedo@redhat.com>
Suggested-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Tao Xu <tao3.xu@intel.com>
Message-Id: <20190805071302.6260-1-tao3.xu@intel.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
---
 include/hw/boards.h | 1 +
 hw/core/numa.c      | 9 +++++++--
 hw/ppc/spapr.c      | 9 +--------
 3 files changed, 9 insertions(+), 10 deletions(-)

diff --git a/include/hw/boards.h b/include/hw/boards.h
index 2289536e48..481e69388e 100644
--- a/include/hw/boards.h
+++ b/include/hw/boards.h
@@ -221,6 +221,7 @@ struct MachineClass {
     bool smbus_no_migration_support;
     bool nvdimm_supported;
     bool numa_mem_supported;
+    bool auto_enable_numa;
 
     HotplugHandler *(*get_hotplug_handler)(MachineState *machine,
                                            DeviceState *dev);
diff --git a/hw/core/numa.c b/hw/core/numa.c
index 4dfec5c95b..1cbaf590af 100644
--- a/hw/core/numa.c
+++ b/hw/core/numa.c
@@ -378,9 +378,14 @@ void numa_complete_configuration(MachineState *ms)
      *   guest tries to use it with that drivers.
      *
      * Enable NUMA implicitly by adding a new NUMA node automatically.
+     *
+     * Or if MachineClass::auto_enable_numa is true and no NUMA nodes,
+     * assume there is just one node with whole RAM.
      */
-    if (ms->ram_slots > 0 && ms->numa_state->num_nodes == 0 &&
-        mc->auto_enable_numa_with_memhp) {
+    if (ms->numa_state->num_nodes == 0 &&
+        ((ms->ram_slots > 0 &&
+        mc->auto_enable_numa_with_memhp) ||
+        mc->auto_enable_numa)) {
             NumaNodeOptions node = { };
             parse_numa_node(ms, &node, &error_abort);
     }
diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index a9cd350f0d..9e1768a095 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -405,14 +405,6 @@ static int spapr_populate_memory(SpaprMachineState *spapr, void *fdt)
     hwaddr mem_start, node_size;
     int i, nb_nodes = machine->numa_state->num_nodes;
     NodeInfo *nodes = machine->numa_state->nodes;
-    NodeInfo ramnode;
-
-    /* No NUMA nodes, assume there is just one node with whole RAM */
-    if (!nb_nodes) {
-        nb_nodes = 1;
-        ramnode.node_mem = machine->ram_size;
-        nodes = &ramnode;
-    }
 
     for (i = 0, mem_start = 0; i < nb_nodes; ++i) {
         if (!nodes[i].node_mem) {
@@ -4457,6 +4449,7 @@ static void spapr_machine_class_init(ObjectClass *oc, void *data)
      */
     mc->numa_mem_align_shift = 28;
     mc->numa_mem_supported = true;
+    mc->auto_enable_numa = true;
 
     smc->default_caps.caps[SPAPR_CAP_HTM] = SPAPR_CAP_OFF;
     smc->default_caps.caps[SPAPR_CAP_VSX] = SPAPR_CAP_ON;
-- 
2.21.0