Drivers: hv: Save and export negotiated vmbus version

Export the negotiated vmbus version as this may be useful for
individual drivers.

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>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/hv/connection.c b/drivers/hv/connection.c
index 2b56a3f47b30..70ea5d1fc16c 100644
--- a/drivers/hv/connection.c
+++ b/drivers/hv/connection.c
@@ -30,6 +30,7 @@
 #include <linux/slab.h>
 #include <linux/vmalloc.h>
 #include <linux/hyperv.h>
+#include <linux/export.h>
 #include <asm/hyperv.h>
 #include "hyperv_vmbus.h"
 
@@ -54,6 +55,12 @@ struct vmbus_connection vmbus_connection = {
 
 #define VERSION_INVAL -1
 
+/*
+ * Negotiated protocol version with the host.
+ */
+__u32 vmbus_proto_version;
+EXPORT_SYMBOL_GPL(vmbus_proto_version);
+
 static __u32 vmbus_get_next_version(__u32 current_version)
 {
         switch (current_version) {
@@ -215,6 +222,8 @@ int vmbus_connect(void)
         if (version == VERSION_INVAL)
                 goto cleanup;
 
+        vmbus_proto_version = version;
+        pr_info("Negotiated host information %d\n", version);
         kfree(msginfo);
         return 0;