[Qemu-devel] [PATCH 4/6] Create MigrationIncomingState

["Dr. David Alan Gilbert (git)" <dgilbert@redhat.com>]

From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>

There are currently lots of pieces of incoming migration state scattered
around, and postcopy is adding more, and it seems better to try and keep
it together.

allocate MIS in process_incoming_migration_co

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Amit Shah <amit.shah@redhat.com>
---
 include/migration/migration.h |  9 +++++++++
 include/qemu/typedefs.h       |  1 +
 migration/migration.c         | 28 ++++++++++++++++++++++++++++
 savevm.c                      |  2 ++
 4 files changed, 40 insertions(+)

diff --git a/include/migration/migration.h b/include/migration/migration.h
index a6e025a..00fb6a0 100644
--- a/include/migration/migration.h
+++ b/include/migration/migration.h
@@ -42,6 +42,15 @@ struct MigrationParams {
 
 typedef struct MigrationState MigrationState;
 
+/* State for the incoming migration */
+struct MigrationIncomingState {
+    QEMUFile *file;
+};
+
+MigrationIncomingState *migration_incoming_get_current(void);
+MigrationIncomingState *migration_incoming_state_new(QEMUFile *f);
+void migration_incoming_state_destroy(void);
+
 struct MigrationState
 {
     int64_t bandwidth_limit;
diff --git a/include/qemu/typedefs.h b/include/qemu/typedefs.h
index cde3314..74dfad3 100644
--- a/include/qemu/typedefs.h
+++ b/include/qemu/typedefs.h
@@ -38,6 +38,7 @@ typedef struct MemoryListener MemoryListener;
 typedef struct MemoryMappingList MemoryMappingList;
 typedef struct MemoryRegion MemoryRegion;
 typedef struct MemoryRegionSection MemoryRegionSection;
+typedef struct MigrationIncomingState MigrationIncomingState;
 typedef struct MigrationParams MigrationParams;
 typedef struct Monitor Monitor;
 typedef struct MouseTransformInfo MouseTransformInfo;
diff --git a/migration/migration.c b/migration/migration.c
index 1660d74..9cf4743 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -53,6 +53,7 @@ static bool deferred_incoming;
    migrations at once.  For now we don't need to add
    dynamic creation of migration */
 
+/* For outgoing */
 MigrationState *migrate_get_current(void)
 {
     static MigrationState current_migration = {
@@ -71,6 +72,28 @@ MigrationState *migrate_get_current(void)
     return &current_migration;
 }
 
+/* For incoming */
+static MigrationIncomingState *mis_current;
+
+MigrationIncomingState *migration_incoming_get_current(void)
+{
+    return mis_current;
+}
+
+MigrationIncomingState *migration_incoming_state_new(QEMUFile* f)
+{
+    mis_current = g_malloc0(sizeof(MigrationIncomingState));
+    mis_current->file = f;
+
+    return mis_current;
+}
+
+void migration_incoming_state_destroy(void)
+{
+    g_free(mis_current);
+    mis_current = NULL;
+}
+
 /*
  * Called on -incoming with a defer: uri.
  * The migration can be started later after any parameters have been
@@ -115,9 +138,14 @@ static void process_incoming_migration_co(void *opaque)
     Error *local_err = NULL;
     int ret;
 
+    migration_incoming_state_new(f);
+
     ret = qemu_loadvm_state(f);
+
     qemu_fclose(f);
     free_xbzrle_decoded_buf();
+    migration_incoming_state_destroy();
+
     if (ret < 0) {
         error_report("load of migration failed: %s", strerror(-ret));
         migrate_decompress_threads_join();
diff --git a/savevm.c b/savevm.c
index d9f0cca..2aa2d19 100644
--- a/savevm.c
+++ b/savevm.c
@@ -1320,9 +1320,11 @@ int load_vmstate(const char *name)
     }
 
     qemu_system_reset(VMRESET_SILENT);
+    migration_incoming_state_new(f);
     ret = qemu_loadvm_state(f);
 
     qemu_fclose(f);
+    migration_incoming_state_destroy();
     if (ret < 0) {
         error_report("Error %d while loading VM state", ret);
         return ret;
-- 
2.4.1