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
@@ -1184,7 +1190,6 @@ impl ToQemuParams for DeviceIntelIommu {
 // to create a QMP unix domain manageent socket, e.g.,
 // -qmp unix:fd=SOCKFD,server=on,wait=off.
 #[derive(Debug, Default, PartialEq)]
-#[allow(dead_code)]
 pub enum MonitorProtocol {
     // Socket using a human-friendly text-based protocol.
     Hmp,
@@ -1230,17 +1235,54 @@ 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
+        let mut socket_paths: Vec<(&str, &str)> = vec![("qmp", QMP_SOCKET_FILE)];
+        // If extra monitor needed, HMP socket with qmp-extra.sock will be added.
+        if extra_monitor {
+            socket_paths.push(("hmp", QMP_EXTRA_SOCKET_FILE));
+        }
+
+        let root_path = Path::new(KATA_PATH).join(sid);
+        for (proto, sock_path) in socket_paths {
+            let sock_path = root_path.join(sock_path);
+            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_rawfd = unsafe { File::from_raw_fd(raw_fd) };
+
+            qmp_sockets.push(QmpSocket {
+                protocol: MonitorProtocol::new(proto),
+                fd: sock_rawfd,
+                server: true,
+                nowait: true,
+            });
+        }
         Ok(qmp_sockets)
     }
 }
 
 #[async_trait]
 impl ToQemuParams for QmpSocket {
     async fn qemu_params(&self) -> Result<Vec<String>> {
-        Ok(vec![])
+        let mut params: Vec<String> = Vec::new();
+
+        // -qmp unix:fd=SOCKFD,server=on,wait=off
+        // -monitor unix:fd=SOCKFD,server=on,wait=off
+        let param_qmp = format!("-{}", self.protocol.to_string());
+        params.push(format!("unix:fd={}", self.fd.as_raw_fd()));
+
+        if self.server {
+            params.push("server=on".to_owned());
+            if self.nowait {
+                params.push("wait=off".to_owned());
+            }
+        }
+
+        Ok(vec![param_qmp, params.join(",")])
     }
 }
 
@@ -1297,8 +1339,7 @@ impl<'a> QemuCmdLine<'a> {
             machine: Machine::new(config),
             cpu: Cpu::new(config),
             rtc: Rtc::new(),
-            qmp_sockets: QmpSocket::new()?,
-
+            qmp_sockets: QmpSocket::new(id, false)?,
             knobs: Knobs::new(config),
             devices: Vec::new(),
         };