migration: Unify migration_cancel and migrate_fd_cancel

There's no need for two separate functions and this _fd_ is a historic
artifact that makes little sense nowadays.

Reviewed-by: Peter Xu <peterx@redhat.com>
Message-ID: <20250213175927.19642-3-farosas@suse.de>
Signed-off-by: Fabiano Rosas <farosas@suse.de>

migration/migration.c

@@ -106,7 +106,6 @@ static GSList *migration_blockers[MIG_MODE__MAX];
 
 static bool migration_object_check(MigrationState *ms, Error **errp);
 static bool migration_switchover_start(MigrationState *s, Error **errp);
-static void migrate_fd_cancel(MigrationState *s);
 static bool close_return_path_on_source(MigrationState *s);
 static void migration_completion_end(MigrationState *s);
 static void migrate_hup_delete(MigrationState *s);
@@ -342,14 +341,6 @@ void migration_bh_schedule(QEMUBHFunc *cb, void *opaque)
     qemu_bh_schedule(bh);
 }
 
-void migration_cancel()
-{
-    if (migrate_dirty_limit()) {
-        qmp_cancel_vcpu_dirty_limit(false, -1, NULL);
-    }
-    migrate_fd_cancel(current_migration);
-}
-
 void migration_shutdown(void)
 {
     /*
@@ -1555,12 +1546,17 @@ static void migrate_fd_error(MigrationState *s, const Error *error)
     migrate_set_error(s, error);
 }
 
-static void migrate_fd_cancel(MigrationState *s)
+void migration_cancel(void)
 {
+    MigrationState *s = migrate_get_current();
     int old_state ;
     bool setup = (s->state == MIGRATION_STATUS_SETUP);
 
-    trace_migrate_fd_cancel();
+    trace_migration_cancel();
+
+    if (migrate_dirty_limit()) {
+        qmp_cancel_vcpu_dirty_limit(false, -1, NULL);
+    }
 
     WITH_QEMU_LOCK_GUARD(&s->qemu_file_lock) {
         if (s->rp_state.from_dst_file) {

migration/trace-events

@@ -156,7 +156,7 @@ multifd_set_outgoing_channel(void *ioc, const char *ioctype, const char *hostnam
 migrate_set_state(const char *new_state) "new state %s"
 migrate_fd_cleanup(void) ""
 migrate_error(const char *error_desc) "error=%s"
-migrate_fd_cancel(void) ""
+migration_cancel(void) ""
 migrate_handle_rp_req_pages(const char *rbname, size_t start, size_t len) "in %s at 0x%zx len 0x%zx"
 migrate_pending_exact(uint64_t size, uint64_t pre, uint64_t post) "exact pending size %" PRIu64 " (pre = %" PRIu64 " post=%" PRIu64 ")"
 migrate_pending_estimate(uint64_t size, uint64_t pre, uint64_t post) "estimate pending size %" PRIu64 " (pre = %" PRIu64 " post=%" PRIu64 ")"