vmm: ivshmem device support

Signed-off-by: Yi Wang <foxywang@tencent.com>
Signed-off-by: Songqian Li <sionli@tencent.com>

vmm/src/vm_config.rs

@@ -650,6 +650,26 @@ impl ApplyLandlock for VsockConfig {
     }
 }
 
+#[cfg(feature = "ivshmem")]
+pub const DEFAULT_IVSHMEM_SIZE: usize = 128;
+
+#[cfg(feature = "ivshmem")]
+#[derive(Clone, Debug, PartialEq, Eq, Deserialize, Serialize)]
+pub struct IvshmemConfig {
+    pub path: PathBuf,
+    pub size: usize,
+}
+
+#[cfg(feature = "ivshmem")]
+impl Default for IvshmemConfig {
+    fn default() -> Self {
+        Self {
+            path: PathBuf::new(),
+            size: DEFAULT_IVSHMEM_SIZE << 20,
+        }
+    }
+}
+
 #[cfg(target_arch = "x86_64")]
 #[derive(Clone, Debug, PartialEq, Eq, Deserialize, Serialize)]
 pub struct SgxEpcConfig {
@@ -896,6 +916,8 @@ pub struct VmConfig {
     #[serde(default)]
     pub landlock_enable: bool,
     pub landlock_rules: Option<Vec<LandlockConfig>>,
+    #[cfg(feature = "ivshmem")]
+    pub ivshmem: Option<IvshmemConfig>,
 }
 
 impl VmConfig {