[PATCH v3 2/6] uio: document uio_hv_generic regions

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Describe the regions present with uio_hv_generic in documentation for
driver API.

Signed-off-by: Stephen Hemminger <sthemmin@xxxxxxxxxxxxx>
---
 Documentation/driver-api/uio-howto.rst | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Documentation/driver-api/uio-howto.rst b/Documentation/driver-api/uio-howto.rst
index 3a0d3f5f5c53..968f4c21c733 100644
--- a/Documentation/driver-api/uio-howto.rst
+++ b/Documentation/driver-api/uio-howto.rst
@@ -698,6 +698,11 @@ prevents the device from generating further interrupts until the bit is
 cleared. The userspace driver should clear this bit before blocking and
 waiting for more interrupts.
 
+The vmbus device regions are mapped into uio device resources:
+    0) Channel ring buffers: guest to host and host to guest
+    1) Guest to host interrupt signalling pages
+    2) Guest to host monitor page
+
 Further information
 ===================
 
-- 
2.15.1

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