[RFC v2 3/6] hw/arm_gic: Add presave/postload hooks

[Peter Maydell <peter.maydell@xxxxxxxxxx>]

Add presave/postload hooks to the ARM GIC common base class.
These will be used by the KVM in-kernel GIC subclass to sync
state between kernel and userspace when migrating.

Signed-off-by: Peter Maydell <peter.maydell@xxxxxxxxxx>
---
 hw/arm_gic_common.c   |   10 ++++++++++
 hw/arm_gic_internal.h |    2 ++
 2 files changed, 12 insertions(+)

diff --git a/hw/arm_gic_common.c b/hw/arm_gic_common.c
index 360e782..d972755 100644
--- a/hw/arm_gic_common.c
+++ b/hw/arm_gic_common.c
@@ -23,9 +23,14 @@
 static void gic_save(QEMUFile *f, void *opaque)
 {
     gic_state *s = (gic_state *)opaque;
+    ARMGICCommonClass *c = ARM_GIC_COMMON_GET_CLASS(s);
     int i;
     int j;
 
+    if (c->pre_save) {
+        c->pre_save(s);
+    }
+
     qemu_put_be32(f, s->enabled);
     for (i = 0; i < s->num_cpu; i++) {
         qemu_put_be32(f, s->cpu_enabled[i]);
@@ -57,6 +62,7 @@ static void gic_save(QEMUFile *f, void *opaque)
 static int gic_load(QEMUFile *f, void *opaque, int version_id)
 {
     gic_state *s = (gic_state *)opaque;
+    ARMGICCommonClass *c = ARM_GIC_COMMON_GET_CLASS(s);
     int i;
     int j;
 
@@ -91,6 +97,10 @@ static int gic_load(QEMUFile *f, void *opaque, int version_id)
         s->irq_state[i].trigger = qemu_get_byte(f);
     }
 
+    if (c->post_load) {
+        c->post_load(s);
+    }
+
     return 0;
 }
 
diff --git a/hw/arm_gic_internal.h b/hw/arm_gic_internal.h
index db4fad5..183dca6 100644
--- a/hw/arm_gic_internal.h
+++ b/hw/arm_gic_internal.h
@@ -118,6 +118,8 @@ void gic_init_irqs_and_distributor(gic_state *s, int num_irq);
 
 typedef struct ARMGICCommonClass {
     SysBusDeviceClass parent_class;
+    void (*pre_save)(gic_state *s);
+    void (*post_load)(gic_state *s);
 } ARMGICCommonClass;
 
 #define TYPE_ARM_GIC "arm_gic"
-- 
1.7.9.5

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