[Qemu-devel] [RFC PATCH v1 5/5] cpu, spapr: Use migration_id from pseries-2.7 onwards

[Bharata B Rao <bharata@linux.vnet.ibm.com>]

Turn on use-migration-id property. Starting from pseries-2.7, prefer the
use of migration_id (cpu_dt_id) over cpu_index for cpu vmstate registration
and in XICS code.

This allows migration to work when CPU cores are not necessarily
unplugged in LIFO order.

TODO: Property use-migration-id is by default turned on, check
if this needs to turned off for older machine type versions of
all archs.

Signed-off-by: Bharata B Rao <bharata@linux.vnet.ibm.com>
---
 hw/ppc/spapr.c | 5 +++++
 qom/cpu.c      | 1 +
 2 files changed, 6 insertions(+)

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 7f33a1b..be9af10 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -2501,6 +2501,11 @@ DEFINE_SPAPR_MACHINE(2_7, "2.7", true);
         .driver   = TYPE_SPAPR_PCI_HOST_BRIDGE,\
         .property = "ddw",\
         .value    = stringify(off),\
+    }, \
+    { \
+        .driver   = TYPE_CPU,\
+        .property = "use-migration-id",\
+        .value    = stringify(off),\
     },
 
 static void spapr_machine_2_6_instance_options(MachineState *machine)
diff --git a/qom/cpu.c b/qom/cpu.c
index 01cf136..e505810 100644
--- a/qom/cpu.c
+++ b/qom/cpu.c
@@ -351,6 +351,7 @@ static void cpu_common_initfn(Object *obj)
     object_property_add_bool(obj, "use-migration-id",
                              cpu_common_get_use_migration_id,
                              cpu_common_set_use_migration_id, NULL);
+    object_property_set_bool(obj, true, "use-migration-id", NULL);
 }
 
 static void cpu_common_finalize(Object *obj)
-- 
2.7.4