[RFC PATCH V2 07/10] Qemu: Add post_load_state() to run after restoring CPU state

[Lan Tianyu <tianyu.lan@xxxxxxxxx>]

After migration, Qemu needs to trigger mailbox irq to notify VF driver
in the guest about status change. The irq delivery restarts to work after
restoring CPU state. This patch is to add new callback to run after
restoring CPU state and provide a way to trigger mailbox irq later.

Signed-off-by: Lan Tianyu <tianyu.lan@xxxxxxxxx>
---
 include/migration/vmstate.h |  2 ++
 migration/savevm.c          | 15 +++++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/include/migration/vmstate.h b/include/migration/vmstate.h
index 0695d7c..dc681a6 100644
--- a/include/migration/vmstate.h
+++ b/include/migration/vmstate.h
@@ -56,6 +56,8 @@ typedef struct SaveVMHandlers {
     int (*save_live_setup)(QEMUFile *f, void *opaque);
     uint64_t (*save_live_pending)(QEMUFile *f, void *opaque, uint64_t max_size);
 
+    /* This runs after restoring CPU related state */
+    void (*post_load_state)(void *opaque);
     LoadStateHandler *load_state;
 } SaveVMHandlers;
 
diff --git a/migration/savevm.c b/migration/savevm.c
index 9e0e286..48b6223 100644
--- a/migration/savevm.c
+++ b/migration/savevm.c
@@ -702,6 +702,20 @@ bool qemu_savevm_state_blocked(Error **errp)
     return false;
 }
 
+void qemu_savevm_post_load(void)
+{
+    SaveStateEntry *se;
+
+    QTAILQ_FOREACH(se, &savevm_state.handlers, entry) {
+        if (!se->ops || !se->ops->post_load_state) {
+            continue;
+        }
+    
+        se->ops->post_load_state(se->opaque);
+    }
+}
+
+
 void qemu_savevm_state_header(QEMUFile *f)
 {
     trace_savevm_state_header();
@@ -1140,6 +1154,7 @@ int qemu_loadvm_state(QEMUFile *f)
     }
 
     cpu_synchronize_all_post_init();
+    qemu_savevm_post_load();
 
     ret = 0;
 
-- 
1.9.3

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