vmm: generic vhost-user: add support

Add VMM support for generic vhost-user devices.

Signed-off-by: Demi Marie Obenour <demiobenour@gmail.com>

vmm/src/vm_config.rs

@@ -472,6 +472,24 @@ impl ApplyLandlock for FsConfig {
     }
 }
 
+#[derive(Clone, Debug, PartialEq, Eq, Deserialize, Serialize)]
+pub struct GenericVhostUserConfig {
+    pub socket: PathBuf,
+    pub queue_sizes: Vec<u16>,
+    #[serde(default)]
+    pub id: Option<String>,
+    #[serde(default)]
+    pub pci_segment: u16,
+    pub device_type: u32,
+}
+
+impl ApplyLandlock for GenericVhostUserConfig {
+    fn apply_landlock(&self, landlock: &mut Landlock) -> LandlockResult<()> {
+        landlock.add_rule_with_access(&self.socket, "rw")?;
+        Ok(())
+    }
+}
+
 #[derive(Clone, Debug, PartialEq, Eq, Deserialize, Serialize)]
 pub struct PmemConfig {
     pub file: PathBuf,
@@ -924,6 +942,7 @@ pub struct VmConfig {
     #[serde(default)]
     pub rng: RngConfig,
     pub balloon: Option<BalloonConfig>,
+    pub generic_vhost_user: Option<Vec<GenericVhostUserConfig>>,
     pub fs: Option<Vec<FsConfig>>,
     pub pmem: Option<Vec<PmemConfig>>,
     #[serde(default = "default_serial")]
@@ -1000,6 +1019,12 @@ impl VmConfig {
             }
         }
 
+        if let Some(generic_vhost_user_configs) = &self.generic_vhost_user {
+            for generic_vhost_user_config in generic_vhost_user_configs.iter() {
+                generic_vhost_user_config.apply_landlock(&mut landlock)?;
+            }
+        }
+
         if let Some(pmem_configs) = &self.pmem {
             for pmem_config in pmem_configs.iter() {
                 pmem_config.apply_landlock(&mut landlock)?;