diff --git a/include/migration/qemu-file.h b/include/migration/qemu-file.h
index d843c0010c..a923cec2a6 100644
--- a/include/migration/qemu-file.h
+++ b/include/migration/qemu-file.h
@@ -121,6 +121,7 @@ QEMUFile *qemu_bufopen(const char *mode, QEMUSizedBuffer *input);
 int qemu_get_fd(QEMUFile *f);
 int qemu_fclose(QEMUFile *f);
 int64_t qemu_ftell(QEMUFile *f);
+int64_t qemu_ftell_fast(QEMUFile *f);
 void qemu_put_buffer(QEMUFile *f, const uint8_t *buf, int size);
 void qemu_put_byte(QEMUFile *f, int v);
 /*
diff --git a/migration/qemu-file.c b/migration/qemu-file.c
index edc283073a..e66e55712f 100644
--- a/migration/qemu-file.c
+++ b/migration/qemu-file.c
@@ -452,6 +452,22 @@ int qemu_get_byte(QEMUFile *f)
     return result;
 }
 
+int64_t qemu_ftell_fast(QEMUFile *f)
+{
+    int64_t ret = f->pos;
+    int i;
+
+    if (f->ops->writev_buffer) {
+        for (i = 0; i < f->iovcnt; i++) {
+            ret += f->iov[i].iov_len;
+        }
+    } else {
+        ret += f->buf_index;
+    }
+
+    return ret;
+}
+
 int64_t qemu_ftell(QEMUFile *f)
 {
     qemu_fflush(f);