Define and export migration_is_device to eliminate a dependency
on MigrationState.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
---
 hw/vfio/common.c         | 4 +---
 include/migration/misc.h | 1 +
 migration/migration.c    | 7 +++++++
 3 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index 2dbbf62..de01068 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -180,10 +180,8 @@ bool vfio_device_state_is_precopy(VFIODevice *vbasedev)
 static bool vfio_devices_all_dirty_tracking(VFIOContainerBase *bcontainer)
 {
     VFIODevice *vbasedev;
-    MigrationState *ms = migrate_get_current();
 
-    if (!migration_is_active() &&
-        ms->state != MIGRATION_STATUS_DEVICE) {
+    if (!migration_is_active() && !migration_is_device()) {
         return false;
     }
 
diff --git a/include/migration/misc.h b/include/migration/misc.h
index c4b5416..28cfaed 100644
--- a/include/migration/misc.h
+++ b/include/migration/misc.h
@@ -61,6 +61,7 @@ void migration_object_init(void);
 void migration_shutdown(void);
 bool migration_is_idle(void);
 bool migration_is_active(void);
+bool migration_is_device(void);
 bool migration_thread_is_self(void);
 bool migration_is_setup_or_active(void);
 bool migrate_mode_is_cpr(MigrationState *);
diff --git a/migration/migration.c b/migration/migration.c
index 27af48c..6b386af 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -1614,6 +1614,13 @@ bool migration_is_active(void)
             s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE);
 }
 
+bool migration_is_device(void)
+{
+    MigrationState *s = current_migration;
+
+    return s->state == MIGRATION_STATUS_DEVICE;
+}
+
 bool migration_thread_is_self(void)
 {
     MigrationState *s = current_migration;
-- 
1.8.3.1