Hyper-V has added VMBus protocol version 5.3.  Allow Linux guests to
negotiate the new version on version of Hyper-V that support it.

Signed-off-by: Andrea Parri (Microsoft) <parri.andrea@gmail.com>
---
 drivers/hv/connection.c | 3 ++-
 include/linux/hyperv.h  | 2 ++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/hv/connection.c b/drivers/hv/connection.c
index 350e8c5cafa8c..dc19d5ae4373c 100644
--- a/drivers/hv/connection.c
+++ b/drivers/hv/connection.c

@@ -45,6 +45,7 @@ EXPORT_SYMBOL_GPL(vmbus_proto_version);
  * Table of VMBus versions listed from newest to oldest.
  */
 static __u32 vmbus_versions[] = {
+	VERSION_WIN10_V5_3,
 	VERSION_WIN10_V5_2,
 	VERSION_WIN10_V5_1,
 	VERSION_WIN10_V5,

@@ -60,7 +61,7 @@ static __u32 vmbus_versions[] = {
  * Maximal VMBus protocol version guests can negotiate.  Useful to cap the
  * VMBus version for testing and debugging purpose.
  */
-static uint max_version = VERSION_WIN10_V5_2;
+static uint max_version = VERSION_WIN10_V5_3;

 module_param(max_version, uint, S_IRUGO);
 MODULE_PARM_DESC(max_version,

diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index 2c18c8e768efe..d6a6f76040b5f 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h

@@ -234,6 +234,7 @@ static inline u32 hv_get_avail_to_write_percent(
  * 5 . 0  (Newer Windows 10)
  * 5 . 1  (Windows 10 RS4)
  * 5 . 2  (Windows Server 2019, RS5)
+ * 5 . 3  (Windows Server 2021) // FIXME: use proper version number/name

  */

 #define VERSION_WS2008  ((0 << 16) | (13))

@@ -245,6 +246,7 @@ static inline u32 hv_get_avail_to_write_percent(
 #define VERSION_WIN10_V5 ((5 << 16) | (0))
 #define VERSION_WIN10_V5_1 ((5 << 16) | (1))
 #define VERSION_WIN10_V5_2 ((5 << 16) | (2))
+#define VERSION_WIN10_V5_3 ((5 << 16) | (3))

 /* Make maximum size of pipe payload of 16K */
 #define MAX_PIPE_DATA_PAYLOAD		(sizeof(u8) * 16384)
--

2.25.1