[PATCH RFC 2/4] migration: Introduce migrate_is_precopy()

[Peter Xu <peterx@redhat.com>]

Export a helper globally to check whether we're during a precopy.

Signed-off-by: Peter Xu <peterx@redhat.com>
---
 include/migration/misc.h | 1 +
 migration/migration.c    | 7 +++++++
 2 files changed, 8 insertions(+)

diff --git a/include/migration/misc.h b/include/migration/misc.h
index e338be8c30..b4f6bf7842 100644
--- a/include/migration/misc.h
+++ b/include/migration/misc.h
@@ -61,6 +61,7 @@ void migration_shutdown(void);
 void qemu_start_incoming_migration(const char *uri, Error **errp);
 bool migration_is_idle(void);
 bool migration_is_active(MigrationState *);
+bool migration_is_precopy(void);
 void add_migration_state_change_notifier(Notifier *notify);
 void remove_migration_state_change_notifier(Notifier *notify);
 bool migration_in_setup(MigrationState *);
diff --git a/migration/migration.c b/migration/migration.c
index 187ac0410c..0082880279 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -1795,6 +1795,13 @@ bool migration_is_active(MigrationState *s)
             s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE);
 }
 
+bool migration_is_precopy(void)
+{
+    MigrationState *s = migrate_get_current();
+
+    return s && s->state == MIGRATION_STATUS_ACTIVE;
+}
+
 void migrate_init(MigrationState *s)
 {
     /*
-- 
2.24.1