spapr: Don't create ibm,dynamic-reconfiguration-memory w/o DR LMBs

If guest doesn't have any dynamically reconfigurable (DR) logical memory
blocks (LMB), then we shouldn't create ibm,dynamic-reconfiguration-memory
device tree node.

Signed-off-by: Bharata B Rao <bharata@linux.vnet.ibm.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 08da895cbad12c6c7dd09775a0e3da0ed24294c8..0ac636890cdf721464c29ef8ae10078636b9f6b5 100644 (file)
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -763,6 +763,13 @@ static int spapr_populate_drconf_memory(sPAPRMachineState *spapr, void *fdt)
     uint32_t *int_buf, *cur_index, buf_len;
     int nr_nodes = nb_numa_nodes ? nb_numa_nodes : 1;
 
+    /*
+     * Don't create the node if there are no DR LMBs.
+     */
+    if (!nr_lmbs) {
+        return 0;
+    }
+
     /*
      * Allocate enough buffer size to fit in ibm,dynamic-memory
      * or ibm,associativity-lookup-arrays
@@ -869,7 +876,7 @@ int spapr_h_cas_compose_response(sPAPRMachineState *spapr,
         _FDT((spapr_fixup_cpu_dt(fdt, spapr)));
     }
 
-    /* Generate memory nodes or ibm,dynamic-reconfiguration-memory node */
+    /* Generate ibm,dynamic-reconfiguration-memory node if required */
     if (memory_update && smc->dr_lmb_enabled) {
         _FDT((spapr_populate_drconf_memory(spapr, fdt)));
     }