documentation: include old vd-interfaces page

In an attempt to avoid many pages with documentation

1 files changed, 33 insertions, 2 deletions

diff --git a/content/pages/documentation.rst b/content/pages/documentation.rst
index a4fc5d1..83d6f31 100644
--- a/content/pages/documentation.rst
+++ b/content/pages/documentation.rst
@@ -60,8 +60,39 @@ Outlines the complete definition of the SPICE client <-> agent protocol |br|
 
 **VD Interfaces**
 
-Includes the VD Interface specifications |br|
-Download `VD interfaces`_
+The following is a clip from VD-Interfaces specification paper.
+
+::
+
+    “Virtual Device Interfaces (VDI) provide a standard way to publish interfaces of
+    virtual devices by a software component. This enables other software components
+    to interact with these devices. Going forward, the first component will be
+    called the back-end and the second component will be called the front-end. An
+    example for using Virtual Device Interfaces is as part of a virtual machine
+    system, where the back-end will be the hardware emulation layer. The back-end
+    will expose interfaces like display port, mouse input etc. The front-end will
+    plug into the display output and will render its output according to it's
+    specific implementation. The front-end will also plug into the mouse input and
+    send mouse events to be processed by the back-end. In addition many other
+    interface types can be exposed by the back-end. Another example of back-end is a
+    remote display system in a physical machine environment. Here, the back-and is
+    implemented using known techniques for interacting with the native OS for the
+    purpose of receiving display updates and pushing inputs. The back-end exposes
+    interfaces like display output, mouse input etc. The front-end can be exactly
+    the same as in the previous example.
+
+    By using VDI one back-end can use many types of front-ends without any special
+    code modification. It is also possible for the back-end to dynamically switch
+    front-ends, and improve back-end usability and flexibility. The use of
+    front-ends by many back-ends allows for a better sharing of development,
+    maintenance, and overall product quality.”
+
+
+Spice server is implemented as a VDI front-end and the Spiced-QEMU provides
+back-end interfaces. The specification is in draft form and requires some minor
+changes. Spice project plans to make an effort to push this specification
+forward in order to benefit all. |br|
+Download the complete specification of `VD interfaces`_
 
 **Spice style**