diff --git a/backends/cryptodev-builtin.c b/backends/cryptodev-builtin.c
index c45b5906c5..39d0455280 100644
--- a/backends/cryptodev-builtin.c
+++ b/backends/cryptodev-builtin.c
@@ -539,10 +539,7 @@ static int cryptodev_builtin_asym_operation(
 
 static int cryptodev_builtin_operation(
                  CryptoDevBackend *backend,
-                 CryptoDevBackendOpInfo *op_info,
-                 uint32_t queue_index,
-                 CryptoDevCompletionFunc cb,
-                 void *opaque)
+                 CryptoDevBackendOpInfo *op_info)
 {
     CryptoDevBackendBuiltin *builtin =
                       CRYPTODEV_BACKEND_BUILTIN(backend);
@@ -574,8 +571,8 @@ static int cryptodev_builtin_operation(
     if (local_error) {
         error_report_err(local_error);
     }
-    if (cb) {
-        cb(opaque, status);
+    if (op_info->cb) {
+        op_info->cb(op_info->opaque, status);
     }
     return 0;
 }
diff --git a/backends/cryptodev-lkcf.c b/backends/cryptodev-lkcf.c
index edec99f104..45aba1ff67 100644
--- a/backends/cryptodev-lkcf.c
+++ b/backends/cryptodev-lkcf.c
@@ -469,10 +469,7 @@ static void *cryptodev_lkcf_worker(void *arg)
 
 static int cryptodev_lkcf_operation(
     CryptoDevBackend *backend,
-    CryptoDevBackendOpInfo *op_info,
-    uint32_t queue_index,
-    CryptoDevCompletionFunc cb,
-    void *opaque)
+    CryptoDevBackendOpInfo *op_info)
 {
     CryptoDevBackendLKCF *lkcf =
         CRYPTODEV_BACKEND_LKCF(backend);
@@ -495,8 +492,8 @@ static int cryptodev_lkcf_operation(
 
     task = g_new0(CryptoDevLKCFTask, 1);
     task->op_info = op_info;
-    task->cb = cb;
-    task->opaque = opaque;
+    task->cb = op_info->cb;
+    task->opaque = op_info->opaque;
     task->sess = sess;
     task->lkcf = lkcf;
     task->status = -VIRTIO_CRYPTO_ERR;
diff --git a/backends/cryptodev.c b/backends/cryptodev.c
index 3a45d19823..ba7b0bc770 100644
--- a/backends/cryptodev.c
+++ b/backends/cryptodev.c
@@ -143,29 +143,22 @@ int cryptodev_backend_close_session(
 
 static int cryptodev_backend_operation(
                  CryptoDevBackend *backend,
-                 CryptoDevBackendOpInfo *op_info,
-                 uint32_t queue_index,
-                 CryptoDevCompletionFunc cb,
-                 void *opaque)
+                 CryptoDevBackendOpInfo *op_info)
 {
     CryptoDevBackendClass *bc =
                       CRYPTODEV_BACKEND_GET_CLASS(backend);
 
     if (bc->do_op) {
-        return bc->do_op(backend, op_info, queue_index, cb, opaque);
+        return bc->do_op(backend, op_info);
     }
     return -VIRTIO_CRYPTO_NOTSUPP;
 }
 
 int cryptodev_backend_crypto_operation(
                  CryptoDevBackend *backend,
-                 void *opaque1,
-                 uint32_t queue_index,
-                 CryptoDevCompletionFunc cb, void *opaque2)
+                 CryptoDevBackendOpInfo *op_info)
 {
-    VirtIOCryptoReq *req = opaque1;
-    CryptoDevBackendOpInfo *op_info = &req->op_info;
-    QCryptodevBackendAlgType algtype = req->flags;
+    QCryptodevBackendAlgType algtype = op_info->algtype;
 
     if ((algtype != QCRYPTODEV_BACKEND_ALG_SYM)
         && (algtype != QCRYPTODEV_BACKEND_ALG_ASYM)) {
@@ -173,8 +166,7 @@ int cryptodev_backend_crypto_operation(
         return -VIRTIO_CRYPTO_NOTSUPP;
     }
 
-    return cryptodev_backend_operation(backend, op_info, queue_index,
-                                       cb, opaque2);
+    return cryptodev_backend_operation(backend, op_info);
 }
 
 static void
diff --git a/hw/virtio/virtio-crypto.c b/hw/virtio/virtio-crypto.c
index e4f0de4d1c..802e1b9659 100644
--- a/hw/virtio/virtio-crypto.c
+++ b/hw/virtio/virtio-crypto.c
@@ -871,6 +871,9 @@ virtio_crypto_handle_request(VirtIOCryptoReq *request)
     opcode = ldl_le_p(&req.header.opcode);
     op_info->session_id = ldq_le_p(&req.header.session_id);
     op_info->op_code = opcode;
+    op_info->queue_index = queue_index;
+    op_info->cb = virtio_crypto_req_complete;
+    op_info->opaque = request;
 
     switch (opcode) {
     case VIRTIO_CRYPTO_CIPHER_ENCRYPT:
@@ -898,9 +901,7 @@ check_result:
             virtio_crypto_req_complete(request, -VIRTIO_CRYPTO_NOTSUPP);
         } else {
             ret = cryptodev_backend_crypto_operation(vcrypto->cryptodev,
-                                    request, queue_index,
-                                    virtio_crypto_req_complete,
-                                    request);
+                                    op_info);
             if (ret < 0) {
                 virtio_crypto_req_complete(request, ret);
             }
diff --git a/include/sysemu/cryptodev.h b/include/sysemu/cryptodev.h
index 16f01dd48a..048a627035 100644
--- a/include/sysemu/cryptodev.h
+++ b/include/sysemu/cryptodev.h
@@ -174,9 +174,14 @@ typedef struct CryptoDevBackendAsymOpInfo {
     uint8_t *dst;
 } CryptoDevBackendAsymOpInfo;
 
+typedef void (*CryptoDevCompletionFunc) (void *opaque, int ret);
+
 typedef struct CryptoDevBackendOpInfo {
     QCryptodevBackendAlgType algtype;
     uint32_t op_code;
+    uint32_t queue_index;
+    CryptoDevCompletionFunc cb;
+    void *opaque; /* argument for cb */
     uint64_t session_id;
     union {
         CryptoDevBackendSymOpInfo *sym_op_info;
@@ -184,7 +189,6 @@ typedef struct CryptoDevBackendOpInfo {
     } u;
 } CryptoDevBackendOpInfo;
 
-typedef void (*CryptoDevCompletionFunc) (void *opaque, int ret);
 struct CryptoDevBackendClass {
     ObjectClass parent_class;
 
@@ -204,10 +208,7 @@ struct CryptoDevBackendClass {
                          void *opaque);
 
     int (*do_op)(CryptoDevBackend *backend,
-                 CryptoDevBackendOpInfo *op_info,
-                 uint32_t queue_index,
-                 CryptoDevCompletionFunc cb,
-                 void *opaque);
+                 CryptoDevBackendOpInfo *op_info);
 };
 
 struct CryptoDevBackendClient {
@@ -335,24 +336,17 @@ int cryptodev_backend_close_session(
 /**
  * cryptodev_backend_crypto_operation:
  * @backend: the cryptodev backend object
- * @opaque1: pointer to a VirtIOCryptoReq object
- * @queue_index: queue index of cryptodev backend client
- * @errp: pointer to a NULL-initialized error object
- * @cb: callbacks when operation is completed
- * @opaque2: parameter passed to cb
+ * @op_info: pointer to a CryptoDevBackendOpInfo object
  *
- * Do crypto operation, such as encryption and
- * decryption
+ * Do crypto operation, such as encryption, decryption, signature and
+ * verification
  *
  * Returns: 0 for success and cb will be called when creation is completed,
  * negative value for error, and cb will not be called.
  */
 int cryptodev_backend_crypto_operation(
                  CryptoDevBackend *backend,
-                 void *opaque1,
-                 uint32_t queue_index,
-                 CryptoDevCompletionFunc cb,
-                 void *opaque2);
+                 CryptoDevBackendOpInfo *op_info);
 
 /**
  * cryptodev_backend_set_used: