migration: migration_file_set_error

Define and export migration_file_set_error to eliminate a dependency
on MigrationState.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Link: https://lore.kernel.org/r/1710179338-294359-9-git-send-email-steven.sistare@oracle.com
Signed-off-by: Peter Xu <peterx@redhat.com>

hw/vfio/common.c

@@ -39,7 +39,6 @@
 #include "sysemu/runstate.h"
 #include "trace.h"
 #include "qapi/error.h"
-#include "migration/migration.h"
 #include "migration/misc.h"
 #include "migration/blocker.h"
 #include "migration/qemu-file.h"
@@ -150,14 +149,8 @@ bool vfio_viommu_preset(VFIODevice *vbasedev)
 
 static void vfio_set_migration_error(int err)
 {
-    MigrationState *ms = migrate_get_current();
-
     if (migration_is_setup_or_active()) {
-        WITH_QEMU_LOCK_GUARD(&ms->qemu_file_lock) {
-            if (ms->to_dst_file) {
-                qemu_file_set_error(ms->to_dst_file, err);
-            }
-        }
+        migration_file_set_error(err);
     }
 }
 

hw/vfio/migration.c

@@ -17,13 +17,12 @@
 
 #include "sysemu/runstate.h"
 #include "hw/vfio/vfio-common.h"
-#include "migration/migration.h"
+#include "migration/misc.h"
 #include "migration/savevm.h"
 #include "migration/vmstate.h"
 #include "migration/qemu-file.h"
 #include "migration/register.h"
 #include "migration/blocker.h"
-#include "migration/misc.h"
 #include "qapi/error.h"
 #include "exec/ramlist.h"
 #include "exec/ram_addr.h"
@@ -714,9 +713,7 @@ static void vfio_vmstate_change_prepare(void *opaque, bool running,
          * Migration should be aborted in this case, but vm_state_notify()
          * currently does not support reporting failures.
          */
-        if (migrate_get_current()->to_dst_file) {
-            qemu_file_set_error(migrate_get_current()->to_dst_file, ret);
-        }
+        migration_file_set_error(ret);
     }
 
     trace_vfio_vmstate_change_prepare(vbasedev->name, running,
@@ -746,9 +743,7 @@ static void vfio_vmstate_change(void *opaque, bool running, RunState state)
          * Migration should be aborted in this case, but vm_state_notify()
          * currently does not support reporting failures.
          */
-        if (migrate_get_current()->to_dst_file) {
-            qemu_file_set_error(migrate_get_current()->to_dst_file, ret);
-        }
+        migration_file_set_error(ret);
     }
 
     trace_vfio_vmstate_change(vbasedev->name, running, RunState_str(state),

include/migration/misc.h

@@ -109,6 +109,8 @@ bool migration_in_setup(MigrationState *);
 bool migration_has_finished(MigrationState *);
 bool migration_has_failed(MigrationState *);
 bool migration_is_running(void);
+void migration_file_set_error(int err);
+
 /* ...and after the device transmission */
 /* True if incoming migration entered POSTCOPY_INCOMING_DISCARD */
 bool migration_in_incoming_postcopy(void);

migration/migration.c

@@ -3038,6 +3038,17 @@ static MigThrError postcopy_pause(MigrationState *s)
     }
 }
 
+void migration_file_set_error(int err)
+{
+    MigrationState *s = current_migration;
+
+    WITH_QEMU_LOCK_GUARD(&s->qemu_file_lock) {
+        if (s->to_dst_file) {
+            qemu_file_set_error(s->to_dst_file, err);
+        }
+    }
+}
+
 static MigThrError migration_detect_error(MigrationState *s)
 {
     int ret;