diff --git a/backends/cryptodev-builtin.c b/backends/cryptodev-builtin.c
index 22fbe84..fa207da 100644
--- a/backends/cryptodev-builtin.c
+++ b/backends/cryptodev-builtin.c
@@ -282,7 +282,7 @@ static int qcrypto_cryptodev_backend_builtin_sym_operation(
             return -VIRTIO_CRYPTO_ERR;
         }
     }
-    return 0;
+    return VIRTIO_CRYPTO_OK;
 }
 
 static void qcrypto_cryptodev_backend_builtin_cleanup(
diff --git a/backends/cryptodev.c b/backends/cryptodev.c
index 8963019..6c2381d 100644
--- a/backends/cryptodev.c
+++ b/backends/cryptodev.c
@@ -30,6 +30,8 @@
 #include "qapi-visit.h"
 #include "qemu/config-file.h"
 #include "qom/object_interfaces.h"
+#include "hw/virtio/virtio-crypto.h"
+
 
 static QTAILQ_HEAD(, QCryptoCryptoDevBackendClientState) crypto_clients;
 
@@ -104,7 +106,7 @@ int qcrypto_cryptodev_backend_sym_close_session(
     return -1;
 }
 
-int qcrypto_cryptodev_backend_sym_operation(
+static int qcrypto_cryptodev_backend_sym_operation(
                  QCryptoCryptoDevBackend *backend,
                  QCryptoCryptoDevBackendSymOpInfo *op_info,
                  uint32_t queue_index, Error **errp)
@@ -116,7 +118,29 @@ int qcrypto_cryptodev_backend_sym_operation(
         return bc->do_sym_op(backend, op_info, queue_index, errp);
     }
 
-    return -1;
+    return -VIRTIO_CRYPTO_ERR;
+}
+
+int qcrypto_cryptodev_backend_crypto_operation(
+                 QCryptoCryptoDevBackend *backend,
+                 void *opaque,
+                 uint32_t queue_index, Error **errp)
+{
+    VirtIOCryptoReq *req = opaque;
+
+    if (req->flags == QCRYPTO_CRYPTODEV_BACKEND_ALG_SYM) {
+        QCryptoCryptoDevBackendSymOpInfo *op_info;
+        op_info = req->u.sym_op_info;
+
+        return qcrypto_cryptodev_backend_sym_operation(backend,
+                         op_info, queue_index, errp);
+    } else {
+        error_setg(errp, "Unsupported cryptodev alg type: %" PRIu32 "",
+                   req->flags);
+       return -VIRTIO_CRYPTO_NOTSUPP;
+    }
+
+    return -VIRTIO_CRYPTO_ERR;
 }
 
 static void
diff --git a/hw/virtio/virtio-crypto.c b/hw/virtio/virtio-crypto.c
index a35dbcd..6d006c3 100644
--- a/hw/virtio/virtio-crypto.c
+++ b/hw/virtio/virtio-crypto.c
@@ -672,15 +672,15 @@ virtio_crypto_handle_request(VirtIOCryptoReq *request)
         request->flags = QCRYPTO_CRYPTODEV_BACKEND_ALG_SYM;
         request->u.sym_op_info = sym_op_info;
         request->idata_hva = idata_hva;
-        ret = qcrypto_cryptodev_backend_sym_operation(vcrypto->cryptodev,
-                                sym_op_info, queue_index, &local_err);
+        ret = qcrypto_cryptodev_backend_crypto_operation(vcrypto->cryptodev,
+                                request, queue_index, &local_err);
         if (ret < 0) {
-            status = VIRTIO_CRYPTO_ERR;
+            status = -ret;
             if (local_err) {
                 error_report_err(local_err);
             }
-        } else { /* ret >= 0 */
-            status = VIRTIO_CRYPTO_OK;
+        } else { /* ret == VIRTIO_CRYPTO_OK */
+            status = ret;
         }
         virtio_crypto_req_complete(request, status);
         virtio_crypto_free_request(request);
diff --git a/include/sysemu/cryptodev.h b/include/sysemu/cryptodev.h
index ea5e1bb..9ae5b22 100644
--- a/include/sysemu/cryptodev.h
+++ b/include/sysemu/cryptodev.h
@@ -259,20 +259,21 @@ int qcrypto_cryptodev_backend_sym_close_session(
            uint32_t queue_index, Error **errp);
 
 /**
- * qcrypto_cryptodev_backend_sym_operation:
+ * qcrypto_cryptodev_backend_crypto_operation:
  * @backend: the cryptodev backend object
- * @op_info: parameters needed by symmetric crypto operation
+ * @opaque: pointer to a VirtIOCryptoReq object
  * @queue_index: queue index of cryptodev backend client
  * @errp: pointer to a NULL-initialized error object
  *
- * Do symmetric crypto operation, such as encryption and
+ * Do crypto operation, such as encryption and
  * decryption
  *
- * Returns: 0 on success, or Negative on error
+ * Returns: VIRTIO_CRYPTO_OK on success,
+ *         or -VIRTIO_CRYPTO_* on error
  */
-int qcrypto_cryptodev_backend_sym_operation(
+int qcrypto_cryptodev_backend_crypto_operation(
                  QCryptoCryptoDevBackend *backend,
-                 QCryptoCryptoDevBackendSymOpInfo *op_info,
+                 void *opaque,
                  uint32_t queue_index, Error **errp);
 
 #endif /* QCRYPTO_CRYPTODEV_H */
