Move loadvm_handlers into MigrationIncomingState

In postcopy we need the loadvm_handlers to be used in a couple
of different instances of the loadvm loop/routine, and thus
it can't be local any more.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>

include/migration/migration.h

@@ -42,9 +42,14 @@ struct MigrationParams {
 
 typedef struct MigrationState MigrationState;
 
+typedef QLIST_HEAD(, LoadStateEntry) LoadStateEntry_Head;
+
 /* State for the incoming migration */
 struct MigrationIncomingState {
     QEMUFile *file;
+
+    /* See savevm.c */
+    LoadStateEntry_Head loadvm_handlers;
 };
 
 MigrationIncomingState *migration_incoming_get_current(void);

include/migration/vmstate.h

@@ -808,6 +808,8 @@ extern const VMStateInfo vmstate_info_bitmap;
 
 #define SELF_ANNOUNCE_ROUNDS 5
 
+void loadvm_free_handlers(MigrationIncomingState *mis);
+
 int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
                        void *opaque, int version_id);
 void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,

include/qemu/typedefs.h

@@ -31,6 +31,7 @@ typedef struct I2CBus I2CBus;
 typedef struct I2SCodec I2SCodec;
 typedef struct ISABus ISABus;
 typedef struct ISADevice ISADevice;
+typedef struct LoadStateEntry LoadStateEntry;
 typedef struct MACAddr MACAddr;
 typedef struct MachineClass MachineClass;
 typedef struct MachineState MachineState;

migration/migration.c

@@ -84,12 +84,14 @@ MigrationIncomingState *migration_incoming_state_new(QEMUFile* f)
 {
     mis_current = g_malloc0(sizeof(MigrationIncomingState));
     mis_current->file = f;
+    QLIST_INIT(&mis_current->loadvm_handlers);
 
     return mis_current;
 }
 
 void migration_incoming_state_destroy(void)
 {
+    loadvm_free_handlers(mis_current);
     g_free(mis_current);
     mis_current = NULL;
 }

migration/savevm.c

@@ -936,18 +936,26 @@ static SaveStateEntry *find_se(const char *idstr, int instance_id)
     return NULL;
 }
 
-typedef struct LoadStateEntry {
+struct LoadStateEntry {
     QLIST_ENTRY(LoadStateEntry) entry;
     SaveStateEntry *se;
     int section_id;
     int version_id;
-} LoadStateEntry;
+};
+
+void loadvm_free_handlers(MigrationIncomingState *mis)
+{
+    LoadStateEntry *le, *new_le;
+
+    QLIST_FOREACH_SAFE(le, &mis->loadvm_handlers, entry, new_le) {
+        QLIST_REMOVE(le, entry);
+        g_free(le);
+    }
+}
 
 int qemu_loadvm_state(QEMUFile *f)
 {
-    QLIST_HEAD(, LoadStateEntry) loadvm_handlers =
+    MigrationIncomingState *mis = migration_incoming_get_current();
-        QLIST_HEAD_INITIALIZER(loadvm_handlers);
-    LoadStateEntry *le, *new_le;
     Error *local_err = NULL;
     uint8_t section_type;
     unsigned int v;
@@ -978,6 +986,7 @@ int qemu_loadvm_state(QEMUFile *f)
     while ((section_type = qemu_get_byte(f)) != QEMU_VM_EOF) {
         uint32_t instance_id, version_id, section_id;
         SaveStateEntry *se;
+        LoadStateEntry *le;
         char idstr[256];
 
         trace_qemu_loadvm_state_section(section_type);
@@ -1019,7 +1028,7 @@ int qemu_loadvm_state(QEMUFile *f)
             le->se = se;
             le->section_id = section_id;
             le->version_id = version_id;
-            QLIST_INSERT_HEAD(&loadvm_handlers, le, entry);
+            QLIST_INSERT_HEAD(&mis->loadvm_handlers, le, entry);
 
             ret = vmstate_load(f, le->se, le->version_id);
             if (ret < 0) {
@@ -1033,7 +1042,7 @@ int qemu_loadvm_state(QEMUFile *f)
             section_id = qemu_get_be32(f);
 
             trace_qemu_loadvm_state_section_partend(section_id);
-            QLIST_FOREACH(le, &loadvm_handlers, entry) {
+            QLIST_FOREACH(le, &mis->loadvm_handlers, entry) {
                 if (le->section_id == section_id) {
                     break;
                 }
@@ -1081,11 +1090,6 @@ int qemu_loadvm_state(QEMUFile *f)
     ret = 0;
 
 out:
-    QLIST_FOREACH_SAFE(le, &loadvm_handlers, entry, new_le) {
-        QLIST_REMOVE(le, entry);
-        g_free(le);
-    }
-
     if (ret == 0) {
         /* We may not have a VMDESC section, so ignore relative errors */
         ret = file_error_after_eof;