spapr: fix inheritance chain for default machine options

Rather than machine instances having backward-compatible option
defaults that need to be repeatedly re-enabled for every new machine
type we introduce, we set the defaults appropriate for newer machine
types, then add code to explicitly disable instance options as needed
to maintain compatibility with older machine types.

Currently pseries-2.5 does not inherit from pseries-2.6 in this
fashion, which is okay at the moment since we do not have any
instance compatibility options for pseries-2.6+ currently.

We will make use of this in future patches though, so fix it here.

Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
[dwg: Extended to make 2.7 inherit from 2.8 as well]
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 03e38039e8739087cb5fe9c5cab07dbd7acd9811..fc4c3c98c8ed120bd30a8673853aeb2507f6ac4e 100644 (file)
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -2475,6 +2475,7 @@ DEFINE_SPAPR_MACHINE(2_8, "2.8", true);
 
 static void spapr_machine_2_7_instance_options(MachineState *machine)
 {
+    spapr_machine_2_8_instance_options(machine);
 }
 
 static void spapr_machine_2_7_class_options(MachineClass *mc)
@@ -2501,6 +2502,7 @@ DEFINE_SPAPR_MACHINE(2_7, "2.7", false);
 
 static void spapr_machine_2_6_instance_options(MachineState *machine)
 {
+    spapr_machine_2_7_instance_options(machine);
 }
 
 static void spapr_machine_2_6_class_options(MachineClass *mc)
@@ -2525,6 +2527,7 @@ DEFINE_SPAPR_MACHINE(2_6, "2.6", false);
 
 static void spapr_machine_2_5_instance_options(MachineState *machine)
 {
+    spapr_machine_2_6_instance_options(machine);
 }
 
 static void spapr_machine_2_5_class_options(MachineClass *mc)