Drivers: hv: Add new message types to enhance KVP

Add additional KVP (Key Value Pair) protocol  messages to
enhance KVP functionality for Linux guests on Hyper-V. As part of this,
patch define an explicit version negoitiation message.

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

1 files changed, 27 insertions, 3 deletions

diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index e57a6c6ee0e8..a2d8c547f91b 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -149,7 +149,11 @@ struct hv_kvp_exchg_msg_value {
         __u32 key_size;
         __u32 value_size;
         __u8 key[HV_KVP_EXCHANGE_MAX_KEY_SIZE];
-        __u8 value[HV_KVP_EXCHANGE_MAX_VALUE_SIZE];
+        union {
+                __u8 value[HV_KVP_EXCHANGE_MAX_VALUE_SIZE];
+                __u32 value_u32;
+                __u64 value_u64;
+        };
 } __attribute__((packed));
 
 struct hv_kvp_msg_enumerate {
@@ -157,11 +161,31 @@ struct hv_kvp_msg_enumerate {
         struct hv_kvp_exchg_msg_value data;
 } __attribute__((packed));
 
+struct hv_kvp_msg_get {
+        struct hv_kvp_exchg_msg_value data;
+};
+
+struct hv_kvp_msg_set {
+        struct hv_kvp_exchg_msg_value data;
+};
+
+struct hv_kvp_msg_delete {
+        __u32 key_size;
+        __u8 key[HV_KVP_EXCHANGE_MAX_KEY_SIZE];
+};
+
+struct hv_kvp_register {
+        __u8 version[HV_KVP_EXCHANGE_MAX_KEY_SIZE];
+};
+
 struct hv_kvp_msg {
         struct hv_kvp_hdr       kvp_hdr;
         union {
-                struct hv_kvp_msg_enumerate     kvp_enum_data;
-                char    kvp_version[HV_KVP_EXCHANGE_MAX_KEY_SIZE];
+                struct hv_kvp_msg_get           kvp_get;
+                struct hv_kvp_msg_set           kvp_set;
+                struct hv_kvp_msg_delete        kvp_delete;
+                struct hv_kvp_msg_enumerate     kvp_enum_data;
+                struct hv_kvp_register          kvp_register;
         } body;
 } __attribute__((packed));