[Qemu-devel] [PATCH v2 4/4] spec/vhost-user: add VHOST_USER_PROTOCOL_F_VERSATILE_SLAVE

[Wei Wang]

The VHOST_USER_PROTOCOL_F_VERSATILE_SLAVE protocol feature indicates
that the slave side implementation supports different types of devices.
The master tells the slave what type of device to create by sending
the VHOST_USER_SET_DEV_INFO message.

Signed-off-by: Wei Wang <address@hidden>
---
 docs/specs/vhost-user.txt | 21 ++++++++++++++++-----
 1 file changed, 16 insertions(+), 5 deletions(-)

diff --git a/docs/specs/vhost-user.txt b/docs/specs/vhost-user.txt
index fdc99ea..da1314d 100644
--- a/docs/specs/vhost-user.txt
+++ b/docs/specs/vhost-user.txt
@@ -264,11 +264,12 @@ restarted.
 Protocol features
 -----------------
 
-#define VHOST_USER_PROTOCOL_F_MQ             0
-#define VHOST_USER_PROTOCOL_F_LOG_SHMFD      1
-#define VHOST_USER_PROTOCOL_F_RARP           2
-#define VHOST_USER_PROTOCOL_F_REPLY_ACK      3
-#define VHOST_USER_PROTOCOL_F_VHOST_PCI      4
+#define VHOST_USER_PROTOCOL_F_MQ               0
+#define VHOST_USER_PROTOCOL_F_LOG_SHMFD        1
+#define VHOST_USER_PROTOCOL_F_RARP             2
+#define VHOST_USER_PROTOCOL_F_REPLY_ACK        3
+#define VHOST_USER_PROTOCOL_F_VHOST_PCI        4
+#define VHOST_USER_PROTOCOL_F_VERSATILE_SLAVE  5
 
 Message types
 -------------
@@ -514,6 +515,16 @@ Message types
       #define VHOST_USER_SET_PEER_CONNECTION_F_CREATE    2
       #define VHOST_USER_SET_PEER_CONNECTION_F_DESTROY   3
 
+ * VHOST_USER_SET_DEV_INFO
+
+      Id: 21
+      Equivalent ioctl: N/A
+      Master payload: u64
+
+      The master sends the device type info to the slave.
+      This request should be sent only when 
VHOST_USER_PROTOCOL_F_VERSATILE_SLAVE
+      has been negotiated.
+
 VHOST_USER_PROTOCOL_F_REPLY_ACK:
 -------------------------------
 The original vhost-user specification only demands replies for certain
-- 
2.7.4