diff --git a/Documentation/00-INDEX b/Documentation/00-INDEX
index 2754fe83f0d4..9959affab599 100644
--- a/Documentation/00-INDEX
+++ b/Documentation/00-INDEX
@@ -410,6 +410,8 @@ vm/
 	- directory with info on the Linux vm code.
 w1/
 	- directory with documents regarding the 1-wire (w1) subsystem.
+warpdrive/
+	- directory with documents about WarpDrive accelerator framework.
 watchdog/
 	- how to auto-reboot Linux if it has "fallen and can't get up". ;-)
 wimax/
diff --git a/Documentation/warpdrive/warpdrive.rst b/Documentation/warpdrive/warpdrive.rst
new file mode 100644
index 000000000000..3792b2780ea6
--- /dev/null
+++ b/Documentation/warpdrive/warpdrive.rst
@@ -0,0 +1,153 @@
+Introduction of WarpDrive
+=========================
+
+*WarpDrive* is a general accelerator framework built on top of vfio.
+It can be taken as a light weight virtual function, which you can use without
+*SR-IOV* like facility and can be shared among multiple processes.
+
+It can be used as the quick channel for accelerators, network adaptors or
+other hardware in user space. It can make some implementation simpler.  E.g.
+you can reuse most of the *netdev* driver and just share some ring buffer to
+the user space driver for *DPDK* or *ODP*. Or you can combine the RSA
+accelerator with the *netdev* in the user space as a Web reversed proxy, etc.
+
+The name *WarpDrive* is simply a cool and general name meaning the framework
+makes the application faster. In kernel, the framework is called SPIMDEV,
+namely "Share Parent IOMMU Mediated Device".
+
+
+How does it work
+================
+
+*WarpDrive* takes the Hardware Accelerator as a heterogeneous processor which
+can share some load for the CPU:
+
+.. image:: wd.svg
+        :alt: This is a .svg image, if your browser cannot show it,
+                try to download and view it locally
+
+So it provides the capability to the user application to:
+
+1. Send request to the hardware
+2. Share memory with the application and other accelerators
+
+These requirements can be fulfilled by VFIO if the accelerator can serve each
+application with a separated Virtual Function. But a *SR-IOV* like VF (we will
+call it *HVF* hereinafter) design is too heavy for the accelerator which
+service thousands of processes.
+
+And the *HVF* is not good for the scenario that a device keep most of its
+resource but share partial of the function to the user space. E.g. a *NIC*
+works as a *netdev* but share some hardware queues to the user application to
+send packets direct to the hardware.
+
+*VFIO-mdev* can solve some of the problem here. But *VFIO-mdev* has two problem:
+
+1. it cannot make use of its parent device's IOMMU.
+2. it is assumed to be openned only once.
+
+So it will need some add-on for better resource control and let the VFIO
+driver be aware of this.
+
+
+Architecture
+------------
+
+The full *WarpDrive* architecture is represented in the following class
+diagram:
+
+.. image:: wd-arch.svg
+        :alt: This is a .svg image, if your browser cannot show it,
+                try to download and view it locally
+
+The idea is: when a device is probed, it can be registered to the general
+framework, e.g. *netdev* or *crypto*, and the *SPIMDEV* at the same time.
+
+If *SPIMDEV* is registered. A *mdev* creation interface is created. Then the
+system administrator can create a *mdev* in the user space and set its
+parameters via its sysfs interfacev. But not like the other mdev
+implementation, hardware resource will not be allocated until it is opened by
+an application.
+
+With this strategy, the hardware resource can be easily scheduled among
+multiple processes.
+
+
+The user API
+------------
+
+We adopt a polling style interface in the user space: ::
+
+        int wd_request_queue(int container, struct wd_queue *q,
+                             const char *mdev)
+        void wd_release_queue(struct wd_queue *q);
+
+        int wd_send(struct wd_queue *q, void *req);
+        int wd_recv(struct wd_queue *q, void **req);
+        int wd_recv_sync(struct wd_queue *q, void **req);
+
+the ..._sync() interface is a wrapper to the non sync version. They wait on the
+device until the queue become available.
+
+Memory can be done by VFIO DMA API. Or the following helper function can be
+adopted: ::
+
+        int wd_mem_share(struct wd_queue *q, const void *addr,
+                         size_t size, int flags);
+        void wd_mem_unshare(struct wd_queue *q, const void *addr, size_t size);
+
+Todo: if the IOMMU support *ATS* or *SMMU* stall mode. mem share is not
+necessary. This can be check with SPImdev sysfs interface.
+
+The user API is not mandatory. It is simply a suggestion and hint what the
+kernel interface is supposed to support.
+
+
+The user driver
+---------------
+
+*WarpDrive* expose the hardware IO space to the user process (via *mmap*). So
+it will require user driver for implementing the user API. The following API
+is suggested for a user driver: ::
+
+        int open(struct wd_queue *q);
+        int close(struct wd_queue *q);
+        int send(struct wd_queue *q, void *req);
+        int recv(struct wd_queue *q, void **req);
+
+These callback enable the communication between the user application and the
+device. You will still need the hardware-depend algorithm driver to access the
+algorithm functionality of the accelerator itself.
+
+
+Multiple processes support
+==========================
+
+In the latest mainline kernel (4.18) when this document is written.
+Multi-process is not supported in VFIO yet.
+
+*JPB* has a patchset to enable this[2]_. We have tested it with our hardware
+(which is known as *D06*). It works well. *WarpDrive* rely on them to support
+multiple processes. If it is not enabled, *WarpDrive* can still work, but it
+support only one process, which will share the same io map table with kernel
+(but the user application cannot access the kernel address, So it is not going
+to be a security problem)
+
+
+Legacy Mode Support
+===================
+For the hardware on which IOMMU is not support, WarpDrive can run on *NOIOMMU*
+mode.
+
+
+References
+==========
+.. [1] Accroding to the comment in in mm/gup.c, The *gup* is only safe within
+       a syscall.  Because it can only keep the physical memory in place
+       without making sure the VMA will always point to it. Maybe we should
+       raise the VM_PINNED patchset (see
+       https://lists.gt.net/linux/kernel/1931993) again to solve this problem.
+.. [2] https://patchwork.kernel.org/patch/10394851/
+.. [3] https://zhuanlan.zhihu.com/p/35489035
+
+.. vim: tw=78
diff --git a/Documentation/warpdrive/wd-arch.svg b/Documentation/warpdrive/wd-arch.svg
new file mode 100644
index 000000000000..1b3d1817c4ba
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new file mode 100644
index 000000000000..87ab92ebfbc6
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