runtime-rs: build qemu params for QmpSocket and refine new method

Fixies: kata-containers#9603

Signed-off-by: Alex Lyn <alex.lyn@antgroup.com>

src/runtime-rs/crates/hypervisor/src/qemu/cmdline_generator.rs

@@ -8,17 +8,23 @@ use crate::{kernel_param::KernelParams, Address, HypervisorConfig};
 
 use anyhow::{anyhow, Context, Result};
 use async_trait::async_trait;
+use kata_types::config::KATA_PATH;
 use std::collections::HashMap;
 use std::fmt::Display;
 use std::fs::{read_to_string, File};
-use std::os::fd::AsRawFd;
+use std::os::fd::{AsRawFd, FromRawFd, IntoRawFd};
+use std::os::unix::net::UnixListener;
+use std::path::Path;
 use tokio;
 
 // These should have been called MiB and GiB for better readability but the
 // more fitting names unfortunately generate linter warnings.
 const MI_B: u64 = 1024 * 1024;
 const GI_B: u64 = 1024 * MI_B;
 
+const QMP_SOCKET_FILE: &str = "qmp.sock";
+const QMP_EXTRA_SOCKET_FILE: &str = "qmp-extra.sock";
+
 // The approach taken here is inspired by govmm.  We build structs, each
 // corresponding to a qemu command line parameter, like Kernel, or a device,
 // for instance MemoryBackendFile.  Members of these structs mostly directly
@@ -1232,19 +1238,66 @@ pub struct QmpSocket {
 }
 
 impl QmpSocket {
-    fn new() -> Result<Vec<Self>> {
-        let qmp_sockets: Vec<QmpSocket> = Vec::new();
-        let _proto = MonitorProtocol::new("qmp");
+    fn new(sid: &str, extra_monitor: bool) -> Result<Vec<Self>> {
+        let mut qmp_sockets: Vec<QmpSocket> = Vec::new();
+
+        // The default QMP socket or called base socket is qmp.sock, its fd will be passed.
+        let root_path = Path::new(KATA_PATH).join(sid);
+        let sock_path = root_path.join(QMP_SOCKET_FILE);
+        let listener = UnixListener::bind(sock_path).context("unix listener bind failed.")?;
+        let raw_fd = listener.into_raw_fd();
+        clear_cloexec(raw_fd).context("clearing unix listenser O_CLOEXEC failed")?;
+        let sock_file = unsafe { File::from_raw_fd(raw_fd) };
+
+        // The default QMP socket or called base socket is qmp.sock.
+        qmp_sockets.push(QmpSocket {
+            protocol: MonitorProtocol::new("qmp"),
+            fd: Some(sock_file),
+            name: QMP_SOCKET_FILE.to_owned(),
+            server: true,
+            nowait: true,
+        });
+
+        // If extra monitor needed, HMP socket with qmp-extra.sock will be added.
+        if extra_monitor {
+            qmp_sockets.push(QmpSocket {
+                protocol: MonitorProtocol::new("hmp"),
+                fd: None,
+                name: root_path.join(QMP_EXTRA_SOCKET_FILE).display().to_string(),
+                server: true,
+                nowait: true,
+            });
+        }
+
         Ok(qmp_sockets)
     }
 }
 
 #[async_trait]
 impl ToQemuParams for QmpSocket {
     async fn qemu_params(&self) -> Result<Vec<String>> {
-        let params: Vec<String> = Vec::new();
+        let mut params: Vec<String> = Vec::new();
+
+        let param_qmp = format!("-{}", self.protocol.to_string());
+        match self.protocol {
+            // -qmp unix:fd=SOCK_FD,server=on,wait=off
+            MonitorProtocol::Qmp | MonitorProtocol::QmpPretty => {
+                params.push(format!("unix:fd={}", self.fd.as_ref().unwrap().as_raw_fd()));
+            }
+            // -monitor unix:path=SOCK_PATH,server=on,wait=off
+            MonitorProtocol::Hmp => {
+                params.push(format!("unix:path={}", &self.name));
+            }
+        }
+
+        if self.server {
+            params.push("server=on".to_owned());
+            if self.nowait {
+                params.push("wait=off".to_owned());
+            }
+        }
 
-        Ok(vec![params.join(",")])
+        Ok(vec![param_qmp, params.join(",")])
     }
 }
 
@@ -1299,7 +1352,7 @@ impl<'a> QemuCmdLine<'a> {
             smp: Smp::new(config),
             machine: Machine::new(config),
             cpu: Cpu::new(config),
-            qmp_sockets: QmpSocket::new()?,
+            qmp_sockets: QmpSocket::new(id, false)?,
             knobs: Knobs::new(config),
             devices: Vec::new(),
         };