diff --git a/backends/Makefile.objs b/backends/Makefile.objs
index 31a3a89..55bd43d 100644
--- a/backends/Makefile.objs
+++ b/backends/Makefile.objs
@@ -9,3 +9,5 @@ common-obj-$(CONFIG_TPM) += tpm.o
 
 common-obj-y += hostmem.o hostmem-ram.o
 common-obj-$(CONFIG_LINUX) += hostmem-file.o
+
+common-obj-y += cryptodev.o
diff --git a/backends/cryptodev.c b/backends/cryptodev.c
new file mode 100644
index 0000000..20ab456
--- /dev/null
+++ b/backends/cryptodev.c
@@ -0,0 +1,176 @@
+/*
+ * QEMU Crypto Device Implementation
+ *
+ * Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD.
+ *
+ * Authors:
+ *    Gonglei <arei.gonglei@huawei.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "qemu/osdep.h"
+#include "sysemu/cryptodev.h"
+#include "hw/boards.h"
+#include "qapi/error.h"
+#include "qapi/visitor.h"
+#include "qapi-types.h"
+#include "qapi-visit.h"
+#include "qemu/config-file.h"
+#include "qom/object_interfaces.h"
+
+static QTAILQ_HEAD(, QCryptoCryptoDevBackendClientState) crypto_clients;
+
+
+QCryptoCryptoDevBackendClientState *
+qcrypto_cryptodev_backend_new_client(const char *model,
+                                    const char *name)
+{
+    QCryptoCryptoDevBackendClientState *cc;
+
+    cc = g_malloc0(sizeof(QCryptoCryptoDevBackendClientState));
+    cc->model = g_strdup(model);
+    if (name) {
+        cc->name = g_strdup(name);
+    }
+
+    QTAILQ_INSERT_TAIL(&crypto_clients, cc, next);
+
+    return cc;
+}
+
+void qcrypto_cryptodev_backend_free_client(
+                  QCryptoCryptoDevBackendClientState *cc)
+{
+    QTAILQ_REMOVE(&crypto_clients, cc, next);
+    g_free(cc->name);
+    g_free(cc->model);
+    g_free(cc->info_str);
+    g_free(cc);
+}
+
+void qcrypto_cryptodev_backend_cleanup(
+             QCryptoCryptoDevBackend *backend,
+             Error **errp)
+{
+    QCryptoCryptoDevBackendClass *bc =
+                  QCRYPTO_CRYPTODEV_BACKEND_GET_CLASS(backend);
+
+    if (bc->cleanup) {
+        bc->cleanup(backend, errp);
+    }
+
+    backend->ready = false;
+}
+
+static void
+qcrypto_cryptodev_backend_get_queues(Object *obj, Visitor *v, const char *name,
+                             void *opaque, Error **errp)
+{
+    QCryptoCryptoDevBackend *backend = QCRYPTO_CRYPTODEV_BACKEND(obj);
+    uint32_t value = backend->conf.peers.queues;
+
+    visit_type_uint32(v, name, &value, errp);
+}
+
+static void
+qcrypto_cryptodev_backend_set_queues(Object *obj, Visitor *v, const char *name,
+                             void *opaque, Error **errp)
+{
+    QCryptoCryptoDevBackend *backend = QCRYPTO_CRYPTODEV_BACKEND(obj);
+    Error *local_err = NULL;
+    uint32_t value;
+
+    visit_type_uint32(v, name, &value, &local_err);
+    if (local_err) {
+        goto out;
+    }
+    if (!value) {
+        error_setg(&local_err, "Property '%s.%s' doesn't take value '%"
+                   PRIu32 "'", object_get_typename(obj), name, value);
+        goto out;
+    }
+    backend->conf.peers.queues = value;
+out:
+    error_propagate(errp, local_err);
+}
+
+static void
+qcrypto_cryptodev_backend_complete(UserCreatable *uc, Error **errp)
+{
+    QCryptoCryptoDevBackend *backend = QCRYPTO_CRYPTODEV_BACKEND(uc);
+    QCryptoCryptoDevBackendClass *bc = QCRYPTO_CRYPTODEV_BACKEND_GET_CLASS(uc);
+    Error *local_err = NULL;
+
+    if (bc->init) {
+        bc->init(backend, &local_err);
+        if (local_err) {
+            goto out;
+        }
+    }
+    backend->ready = true;
+    return;
+
+out:
+    backend->ready = false;
+    error_propagate(errp, local_err);
+}
+
+static void qcrypto_cryptodev_backend_instance_init(Object *obj)
+{
+    object_property_add(obj, "queues", "int",
+                          qcrypto_cryptodev_backend_get_queues,
+                          qcrypto_cryptodev_backend_set_queues,
+                          NULL, NULL, NULL);
+    /* Initialize devices' queues property to 1 */
+    object_property_set_int(obj, 1, "queues", NULL);
+}
+
+static void qcrypto_cryptodev_backend_finalize(Object *obj)
+{
+
+}
+
+static void
+qcrypto_cryptodev_backend_class_init(ObjectClass *oc, void *data)
+{
+    UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);
+
+    ucc->complete = qcrypto_cryptodev_backend_complete;
+
+    QTAILQ_INIT(&crypto_clients);
+}
+
+static const TypeInfo qcrypto_cryptodev_backend_info = {
+    .name = TYPE_QCRYPTO_CRYPTODEV_BACKEND,
+    .parent = TYPE_OBJECT,
+    .instance_size = sizeof(QCryptoCryptoDevBackend),
+    .instance_init = qcrypto_cryptodev_backend_instance_init,
+    .instance_finalize = qcrypto_cryptodev_backend_finalize,
+    .class_size = sizeof(QCryptoCryptoDevBackendClass),
+    .class_init = qcrypto_cryptodev_backend_class_init,
+    .interfaces = (InterfaceInfo[]) {
+        { TYPE_USER_CREATABLE },
+        { }
+    }
+};
+
+static void
+qcrypto_cryptodev_backend_register_types(void)
+{
+    type_register_static(&qcrypto_cryptodev_backend_info);
+}
+
+type_init(qcrypto_cryptodev_backend_register_types);
diff --git a/include/sysemu/cryptodev.h b/include/sysemu/cryptodev.h
new file mode 100644
index 0000000..d43cbb4
--- /dev/null
+++ b/include/sysemu/cryptodev.h
@@ -0,0 +1,145 @@
+/*
+ * QEMU Crypto Device Implementation
+ *
+ * Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD.
+ *
+ * Authors:
+ *    Gonglei <arei.gonglei@huawei.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+#ifndef QCRYPTO_CRYPTODEV_H
+#define QCRYPTO_CRYPTODEV_H
+
+#include "qom/object.h"
+#include "qemu-common.h"
+
+/**
+ * QCryptoCryptoDevBackend:
+ *
+ * The QCryptoCryptoDevBackend object is an interface
+ * for different cryptodev backends, which provides crypto
+ * operation wrapper.
+ *
+ */
+
+#define TYPE_QCRYPTO_CRYPTODEV_BACKEND "cryptodev-backend"
+
+#define QCRYPTO_CRYPTODEV_BACKEND(obj) \
+    OBJECT_CHECK(QCryptoCryptoDevBackend, \
+                 (obj), TYPE_QCRYPTO_CRYPTODEV_BACKEND)
+#define QCRYPTO_CRYPTODEV_BACKEND_GET_CLASS(obj) \
+    OBJECT_GET_CLASS(QCryptoCryptoDevBackendClass, \
+                 (obj), TYPE_QCRYPTO_CRYPTODEV_BACKEND)
+#define QCRYPTO_CRYPTODEV_BACKEND_CLASS(klass) \
+    OBJECT_CLASS_CHECK(QCryptoCryptoDevBackendClass, \
+                (klass), TYPE_QCRYPTO_CRYPTODEV_BACKEND)
+
+
+#define MAX_CRYPTO_QUEUE_NUM  64
+
+typedef struct QCryptoCryptoDevBackendConf QCryptoCryptoDevBackendConf;
+typedef struct QCryptoCryptoDevBackendPeers QCryptoCryptoDevBackendPeers;
+typedef struct QCryptoCryptoDevBackendClientState
+                     QCryptoCryptoDevBackendClientState;
+typedef struct QCryptoCryptoDevBackend QCryptoCryptoDevBackend;
+
+
+typedef struct QCryptoCryptoDevBackendClass {
+    ObjectClass parent_class;
+
+    void (*init)(QCryptoCryptoDevBackend *backend, Error **errp);
+    void (*cleanup)(QCryptoCryptoDevBackend *backend, Error **errp);
+} QCryptoCryptoDevBackendClass;
+
+
+struct QCryptoCryptoDevBackendClientState {
+    char *model;
+    char *name;
+    char *info_str;
+    unsigned int queue_index;
+    QTAILQ_ENTRY(QCryptoCryptoDevBackendClientState) next;
+};
+
+struct QCryptoCryptoDevBackendPeers {
+    QCryptoCryptoDevBackendClientState *ccs[MAX_CRYPTO_QUEUE_NUM];
+    uint32_t queues;
+};
+
+struct QCryptoCryptoDevBackendConf {
+    QCryptoCryptoDevBackendPeers peers;
+
+    /* Supported service mask */
+    uint32_t crypto_services;
+
+    /* Detailed algorithms mask */
+    uint32_t cipher_algo_l;
+    uint32_t cipher_algo_h;
+    uint32_t hash_algo;
+    uint32_t mac_algo_l;
+    uint32_t mac_algo_h;
+    uint32_t asym_algo;
+    uint32_t kdf_algo;
+    uint32_t aead_algo;
+    uint32_t primitive_algo;
+};
+
+struct QCryptoCryptoDevBackend {
+    Object parent_obj;
+
+    bool ready;
+    QCryptoCryptoDevBackendConf conf;
+};
+
+/**
+ * qcrypto_cryptodev_backend_new_client:
+ * @model: the cryptodev backend model
+ * @name: the cryptodev backend name, can be NULL
+ *
+ * Creates a new cryptodev backend client object
+ * with the @name in the model @model.
+ *
+ * The returned object must be released with
+ * qcrypto_cryptodev_backend_free_client() when no
+ * longer required
+ *
+ * Returns: a new cryptodev backend client object
+ */
+QCryptoCryptoDevBackendClientState *
+qcrypto_cryptodev_backend_new_client(const char *model,
+                                    const char *name);
+/**
+ * qcrypto_cryptodev_backend_free_client:
+ * @cc: the cryptodev backend client object
+ *
+ * Release the memory associated with @cc that
+ * was previously allocated by qcrypto_cryptodev_backend_new_client()
+ */
+void qcrypto_cryptodev_backend_free_client(
+                  QCryptoCryptoDevBackendClientState *cc);
+
+/**
+ * qcrypto_cryptodev_backend_cleanup:
+ * @backend: the cryptodev backend object
+ * @errp: pointer to a NULL-initialized error object
+ *
+ * Clean the resouce associated with @backend that realizaed
+ * by the specific backend's init() callback
+ */
+void qcrypto_cryptodev_backend_cleanup(
+           QCryptoCryptoDevBackend *backend,
+           Error **errp);
+
+#endif /* QCRYPTO_CRYPTODEV_H */
