Drivers: hv: Enable protocol negotiation with win8 hosts

Now that we have implemented all of the Win8 (WS2012) functionality, negotiate
Win8 protocol with the host.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/hv/connection.c

@@ -194,7 +194,7 @@ int vmbus_connect(void)
 	 * version.
 	 */
 
-	version = VERSION_WS2008;
+	version = VERSION_CURRENT;
 
 	do {
 		ret = vmbus_negotiate_version(msginfo, version);

include/linux/hyperv.h

@@ -434,6 +434,7 @@ hv_get_ringbuffer_availbytes(struct hv_ring_buffer_info *rbi,
 
 #define VERSION_INVAL -1
 
+#define VERSION_CURRENT VERSION_WIN8
 
 /* Make maximum size of pipe payload of 16K */
 #define MAX_PIPE_DATA_PAYLOAD		(sizeof(u8) * 16384)