devices: pvpanic: add method for DeviceManager

Add method for DeviceManager to invoke.

Signed-off-by: Yi Wang <foxywang@tencent.com>
Signed-off-by: Rob Bradford <rbradford@rivosinc.com>

vmm/src/config.rs

@@ -370,6 +370,7 @@ pub struct VmParams<'a> {
     pub user_devices: Option<Vec<&'a str>>,
     pub vdpa: Option<Vec<&'a str>>,
     pub vsock: Option<&'a str>,
+    pub pvpanic: bool,
     #[cfg(target_arch = "x86_64")]
     pub sgx_epc: Option<Vec<&'a str>>,
     pub numa: Option<Vec<&'a str>>,
@@ -2084,6 +2085,7 @@ impl VmConfig {
             user_devices,
             vdpa,
             vsock,
+            pvpanic: vm_params.pvpanic,
             iommu: false, // updated in VmConfig::validate()
             #[cfg(target_arch = "x86_64")]
             sgx_epc,
@@ -2767,6 +2769,7 @@ mod tests {
             user_devices: None,
             vdpa: None,
             vsock: None,
+            pvpanic: false,
             iommu: false,
             #[cfg(target_arch = "x86_64")]
             sgx_epc: None,

vmm/src/device_manager.rs

@@ -114,6 +114,7 @@ const RNG_DEVICE_NAME: &str = "__rng";
 const IOMMU_DEVICE_NAME: &str = "__iommu";
 const BALLOON_DEVICE_NAME: &str = "__balloon";
 const CONSOLE_DEVICE_NAME: &str = "__console";
+const PVPANIC_DEVICE_NAME: &str = "__pvpanic";
 
 // Devices that the user may name and for which we generate
 // identifiers if the user doesn't give one
@@ -470,6 +471,9 @@ pub enum DeviceManagerError {
 
     /// Failed retrieving device state from snapshot
     RestoreGetState(MigratableError),
+
+    /// Cannot create a PvPanic device
+    PvPanicCreate(devices::pvpanic::PvPanicError),
 }
 pub type DeviceManagerResult<T> = result::Result<T, DeviceManagerError>;
 
@@ -931,6 +935,9 @@ pub struct DeviceManager {
     // GPIO device for AArch64
     gpio_device: Option<Arc<Mutex<devices::legacy::Gpio>>>,
 
+    // pvpanic device
+    pvpanic_device: Option<Arc<Mutex<devices::PvPanicDevice>>>,
+
     // Flag to force setting the iommu on virtio devices
     force_iommu: bool,
 
@@ -1122,6 +1129,7 @@ impl DeviceManager {
             virtio_mem_devices: Vec::new(),
             #[cfg(target_arch = "aarch64")]
             gpio_device: None,
+            pvpanic_device: None,
             force_iommu,
             io_uring_supported: None,
             boot_id_list,
@@ -1245,6 +1253,10 @@ impl DeviceManager {
 
         self.virtio_devices = virtio_devices;
 
+        if self.config.clone().lock().unwrap().pvpanic {
+            self.pvpanic_device = self.add_pvpanic_device()?;
+        }
+
         Ok(())
     }
 
@@ -3604,6 +3616,43 @@ impl DeviceManager {
         Ok(pci_device_bdf)
     }
 
+    fn add_pvpanic_device(
+        &mut self,
+    ) -> DeviceManagerResult<Option<Arc<Mutex<devices::PvPanicDevice>>>> {
+        let id = String::from(PVPANIC_DEVICE_NAME);
+        let pci_segment_id = 0x0_u16;
+
+        info!("Creating pvpanic device {}", id);
+
+        let (pci_segment_id, pci_device_bdf, resources) =
+            self.pci_resources(&id, pci_segment_id)?;
+
+        let snapshot = snapshot_from_id(self.snapshot.as_ref(), id.as_str());
+
+        let pvpanic_device = devices::PvPanicDevice::new(id.clone(), snapshot)
+            .map_err(DeviceManagerError::PvPanicCreate)?;
+
+        let pvpanic_device = Arc::new(Mutex::new(pvpanic_device));
+
+        let new_resources = self.add_pci_device(
+            pvpanic_device.clone(),
+            pvpanic_device.clone(),
+            pci_segment_id,
+            pci_device_bdf,
+            resources,
+        )?;
+
+        let mut node = device_node!(id, pvpanic_device);
+
+        node.resources = new_resources;
+        node.pci_bdf = Some(pci_device_bdf);
+        node.pci_device_handle = None;
+
+        self.device_tree.lock().unwrap().insert(id, node);
+
+        Ok(Some(pvpanic_device))
+    }
+
     fn pci_resources(
         &self,
         id: &str,

vmm/src/lib.rs

@@ -2197,6 +2197,7 @@ mod unit_tests {
             user_devices: None,
             vdpa: None,
             vsock: None,
+            pvpanic: false,
             iommu: false,
             #[cfg(target_arch = "x86_64")]
             sgx_epc: None,

vmm/src/vm_config.rs

@@ -586,6 +586,8 @@ pub struct VmConfig {
     pub vdpa: Option<Vec<VdpaConfig>>,
     pub vsock: Option<VsockConfig>,
     #[serde(default)]
+    pub pvpanic: bool,
+    #[serde(default)]
     pub iommu: bool,
     #[cfg(target_arch = "x86_64")]
     pub sgx_epc: Option<Vec<SgxEpcConfig>>,