hw/intc/arm_gicv3_common: Move post_load hooks to top-level VMSD

Contrary to the the impression given in docs/devel/migration.rst,
the migration code does not run the pre_load hook for a
subsection unless the subsection appears on the wire, and so
this is not a place where you can set the default value for
state for the "subsection not present" case. Instead this needs
to be done in a pre_load hook for whatever is the parent VMSD
of the subsection.

We got this wrong in two of the subsection definitions in
the GICv3 migration structs; fix this.
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
Reviewed-by: NRichard Henderson <richard.henderson@linaro.org>
Reviewed-by: NDr. David Alan Gilbert <dgilbert@redhat.com>
Message-id: 20180806123445.1459-5-peter.maydell@linaro.org

hw/intc/arm_gicv3_common.c

@@ -73,7 +73,7 @@ static const VMStateDescription vmstate_gicv3_cpu_virt = {
     }
 };
 
-static int icc_sre_el1_reg_pre_load(void *opaque)
+static int vmstate_gicv3_cpu_pre_load(void *opaque)
 {
     GICv3CPUState *cs = opaque;
 
@@ -97,7 +97,6 @@ const VMStateDescription vmstate_gicv3_cpu_sre_el1 = {
     .name = "arm_gicv3_cpu/sre_el1",
     .version_id = 1,
     .minimum_version_id = 1,
-    .pre_load = icc_sre_el1_reg_pre_load,
     .needed = icc_sre_el1_reg_needed,
     .fields = (VMStateField[]) {
         VMSTATE_UINT64(icc_sre_el1, GICv3CPUState),
@@ -109,6 +108,7 @@ static const VMStateDescription vmstate_gicv3_cpu = {
     .name = "arm_gicv3_cpu",
     .version_id = 1,
     .minimum_version_id = 1,
+    .pre_load = vmstate_gicv3_cpu_pre_load,
     .fields = (VMStateField[]) {
         VMSTATE_UINT32(level, GICv3CPUState),
         VMSTATE_UINT32(gicr_ctlr, GICv3CPUState),
@@ -139,7 +139,7 @@ static const VMStateDescription vmstate_gicv3_cpu = {
     }
 };
 
-static int gicv3_gicd_no_migration_shift_bug_pre_load(void *opaque)
+static int gicv3_pre_load(void *opaque)
 {
     GICv3State *cs = opaque;
 
@@ -210,7 +210,6 @@ const VMStateDescription vmstate_gicv3_gicd_no_migration_shift_bug = {
     .version_id = 1,
     .minimum_version_id = 1,
     .needed = needed_always,
-    .pre_load = gicv3_gicd_no_migration_shift_bug_pre_load,
     .post_load = gicv3_gicd_no_migration_shift_bug_post_load,
     .fields = (VMStateField[]) {
         VMSTATE_BOOL(gicd_no_migration_shift_bug, GICv3State),
@@ -222,6 +221,7 @@ static const VMStateDescription vmstate_gicv3 = {
     .name = "arm_gicv3",
     .version_id = 1,
     .minimum_version_id = 1,
+    .pre_load = gicv3_pre_load,
     .pre_save = gicv3_pre_save,
     .post_load = gicv3_post_load,
     .priority = MIG_PRI_GICV3,