s390x: Fix CSS migration

Commit a55ae46 ("s390: move css_migration_enabled from machine to
css.c") disabled CSS migration globally instead of doing it
per-instance.

CC: Paolo Bonzini <[email protected]>
CC: [email protected] #9.1
Fixes: a55ae46 ("s390: move css_migration_enabled from machine to css.c")
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2704
Reviewed-by: Thomas Huth <[email protected]>
Message-Id: <[email protected]>
Signed-off-by: Fabiano Rosas <[email protected]>
(cherry picked from commit c76ee1f)
Signed-off-by: Michael Tokarev <[email protected]>

Author: Fabiano Rosas

hw/s390x/s390-virtio-ccw.c

@@ -1200,6 +1200,7 @@ static void ccw_machine_2_9_instance_options(MachineState *machine)
     s390_cpudef_featoff_greater(12, 1, S390_FEAT_ZPCI);
     s390_cpudef_featoff_greater(12, 1, S390_FEAT_ADAPTER_INT_SUPPRESSION);
     s390_cpudef_featoff_greater(12, 1, S390_FEAT_ADAPTER_EVENT_NOTIFICATION);
+    css_migration_enabled = false;
 }
 
 static void ccw_machine_2_9_class_options(MachineClass *mc)
@@ -1212,7 +1213,6 @@ static void ccw_machine_2_9_class_options(MachineClass *mc)
     ccw_machine_2_10_class_options(mc);
     compat_props_add(mc->compat_props, hw_compat_2_9, hw_compat_2_9_len);
     compat_props_add(mc->compat_props, compat, G_N_ELEMENTS(compat));
-    css_migration_enabled = false;
 }
 DEFINE_CCW_MACHINE(2, 9);