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diff --git a/hw/rdma/rdma_backend_defs.h b/hw/rdma/rdma_backend_defs.h
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+++ b/hw/rdma/rdma_backend_defs.h
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+/*
+ *  RDMA device: Definitions of Backend Device structures
+ *
+ * Copyright (C) 2018 Oracle
+ * Copyright (C) 2018 Red Hat Inc
+ *
+ * Authors:
+ *     Yuval Shaia <yuval.shaia@oracle.com>
+ *     Marcel Apfelbaum <marcel@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ */
+
+#ifndef RDMA_BACKEND_DEFS_H
+#define RDMA_BACKEND_DEFS_H
+
+#include <infiniband/verbs.h>
+#include <qemu/thread.h>
+
+typedef struct RdmaDeviceResources RdmaDeviceResources;
+
+typedef struct RdmaBackendThread {
+    QemuThread thread;
+    QemuMutex mutex;
+    bool run;
+} RdmaBackendThread;
+
+typedef struct RdmaBackendDev {
+    struct ibv_device_attr dev_attr;
+    RdmaBackendThread comp_thread;
+    union ibv_gid gid;
+    PCIDevice *dev;
+    RdmaDeviceResources *rdma_dev_res;
+    struct ibv_device *ib_dev;
+    struct ibv_context *context;
+    struct ibv_comp_channel *channel;
+    uint8_t port_num;
+    uint8_t backend_gid_idx;
+} RdmaBackendDev;
+
+typedef struct RdmaBackendPD {
+    struct ibv_pd *ibpd;
+} RdmaBackendPD;
+
+typedef struct RdmaBackendMR {
+    struct ibv_pd *ibpd;
+    struct ibv_mr *ibmr;
+} RdmaBackendMR;
+
+typedef struct RdmaBackendCQ {
+    RdmaBackendDev *backend_dev;
+    struct ibv_cq *ibcq;
+} RdmaBackendCQ;
+
+typedef struct RdmaBackendQP {
+    struct ibv_pd *ibpd;
+    struct ibv_qp *ibqp;
+} RdmaBackendQP;
+
+#endif