hw/arm_gic: Add presave/postload hooks

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@linaro.org>
Reviewed-by: Andreas Färber <afaerber@suse.de>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>

hw/arm_gic_common.c

diff --git a/hw/arm_gic_common.c b/hw/arm_gic_common.c
index 40e8dd7..2947622 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)
 {
     GICState *s = (GICState *)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 int gic_load(QEMUFile *f, void *opaque, int version_id)
 {
     GICState *s = (GICState *)opaque;
+    ARMGICCommonClass *c = ARM_GIC_COMMON_GET_CLASS(s);
     int i;
     int j;
 
@@ -91,6 +97,10 @@
         s->irq_state[i].trigger = qemu_get_byte(f);
     }
 
+    if (c->post_load) {
+        c->post_load(s);
+    }
+
     return 0;
 }
 

hw/arm_gic_internal.h

diff --git a/hw/arm_gic_internal.h b/hw/arm_gic_internal.h
index 699352c..3640be0 100644
--- a/hw/arm_gic_internal.h
+++ b/hw/arm_gic_internal.h
@@ -118,6 +118,8 @@
 
 typedef struct ARMGICCommonClass {
     SysBusDeviceClass parent_class;
+    void (*pre_save)(GICState *s);
+    void (*post_load)(GICState *s);
 } ARMGICCommonClass;
 
 #define TYPE_ARM_GIC "arm_gic"