vsock: default disable qemu vsock device

Signed-off-by: Weikang Guo <guoweikang@kylinos.cn>

Author: guoweikang

.gitignore

@@ -11,3 +11,6 @@
 /.cargo
 /.crates*
 /mnt
+*.swp
+*.swo
+

Makefile

@@ -7,7 +7,7 @@ export MEMTRACK := n
 # QEMU Options
 export BLK := y
 export NET := y
-export VSOCK := y
+export VSOCK := n
 export MEM := 1G
 export ICOUNT := n
 

api/src/socket.rs

@@ -223,12 +223,15 @@ impl SocketAddrExt for VsocketAddr {
     }
 
     fn write_to_user(&self, addr: UserPtr<sockaddr>, addrlen: &mut socklen_t) -> AxResult<()> {
-        let mut buf: Vec<u8> = Vec::with_capacity(16); // size of sockaddr_vm
-        buf.extend_from_slice(&(AF_VSOCK as u16).to_le_bytes()); // family
-        buf.extend_from_slice(&0u16.to_le_bytes()); // reserved1
-        buf.extend_from_slice(&self.port.to_le_bytes());
-        buf.extend_from_slice(&self.cid.to_le_bytes());
-        buf.extend_from_slice(&[0u8; 4]); // padding = 16 - 2 - 2 - 4 - 4 = 4
+        let mut buf = [0u8; 16];
+        // 0-1: family (AF_VSOCK = 40)
+        buf[0..2].copy_from_slice(&(AF_VSOCK as u16).to_le_bytes());
+        // 2-3: reserved1 as 0
+        // 4-7: port
+        buf[4..8].copy_from_slice(&self.port.to_le_bytes());
+        // 8-11: cid
+        buf[8..12].copy_from_slice(&self.cid.to_le_bytes());
+        // 12-15: padding 0
         fill_addr(addr, addrlen, &buf)
     }