Few fixes and improvements requested by UI team:

 - Add image details
 - virt.global.config event
 - make sure "autostart" is always a boolean

src/middlewared/middlewared/api/v25_04_0/virt.py

@@ -155,6 +155,16 @@ class VirtInstanceAlias(BaseModel):
 InstanceType: TypeAlias = Literal['CONTAINER', 'VM']
 
 
+class Image(BaseModel):
+    architecture: str | None
+    description: str | None
+    os: str | None
+    release: str | None
+    serial: str | None
+    type: str | None
+    variant: str | None
+
+
 class VirtInstanceEntry(BaseModel):
     id: str
     name: Annotated[NonEmptyString, StringConstraints(max_length=200)]
@@ -165,6 +175,7 @@ class VirtInstanceEntry(BaseModel):
     autostart: bool
     environment: dict[str, str]
     aliases: List[VirtInstanceAlias]
+    image: Image
     raw: dict
 
 
@@ -174,19 +185,19 @@ class VirtInstanceCreateArgs(BaseModel):
     image: Annotated[NonEmptyString, StringConstraints(max_length=200)]
     remote: REMOTE_CHOICES = 'LINUX_CONTAINERS'
     instance_type: InstanceType = 'CONTAINER'
-    environment: dict | None = None
-    autostart: bool | None = None
+    environment: dict[str, str] | None = None
+    autostart: bool | None = True
     cpu: str | None = None
     memory: int | None = None
     devices: List[DeviceType] = None
 
 
 class VirtInstanceCreateResult(BaseModel):
-    result: dict
+    result: VirtInstanceEntry
 
 
 class VirtInstanceUpdate(BaseModel, metaclass=ForUpdateMetaclass):
-    environment: dict | None = None
+    environment: dict[str, str] | None = None
     autostart: bool | None = None
     cpu: str | None = None
     memory: int | None = None

src/middlewared/middlewared/plugins/virt/global.py

@@ -212,6 +212,8 @@ async def setup(self, job):
             raise
         else:
             await self.middleware.call('cache.put', 'VIRT_STATE', Status.INITIALIZED.value)
+        finally:
+            self.middleware.send_event('virt.global.config', 'CHANGED', fields=await self.config())
 
     async def _setup_impl(self, job):
         config = await self.config()
@@ -395,6 +397,11 @@ async def _event_system_ready(middleware: 'Middleware', event_type, args):
 
 
 async def setup(middleware: 'Middleware'):
+    middleware.event_register(
+        'virt.global.config',
+        'Sent on virtualziation configuration changes.',
+        roles=['VIRT_GLOBAL_READ']
+    )
     middleware.event_subscribe('system.ready', _event_system_ready)
     # Should only happen if middlewared crashes or during development
     failover_licensed = await middleware.call('failover.licensed')

src/middlewared/middlewared/plugins/virt/instance.py

@@ -51,11 +51,21 @@ async def query(self, filters, options):
                 'type': 'CONTAINER' if i['type'] == 'container' else 'VM',
                 'status': i['state']['status'].upper(),
                 'cpu': i['config'].get('limits.cpu'),
-                'autostart': i['config'].get('boot.autostart') or False,
+                'autostart': bool(i['config'].get('boot.autostart')) or False,
                 'environment': {},
                 'aliases': [],
+                'image': {
+                    'architecture': i['config'].get('image.architecture'),
+                    'description': i['config'].get('image.description'),
+                    'os': i['config'].get('image.os'),
+                    'release': i['config'].get('image.release'),
+                    'serial': i['config'].get('image.serial'),
+                    'type': i['config'].get('image.type'),
+                    'variant': i['config'].get('image.variant'),
+                }
             }
 
+
             if options.get('extra').get('raw'):
                 entry['raw'] = i
 
@@ -195,7 +205,7 @@ async def do_update(self, job, id, data):
         instance = await self.middleware.call('virt.instance.get_instance', id, {'extra': {'raw': True}})
 
         verrors = ValidationErrors()
-        await self.validate(data, 'virt_instance_create', verrors, old=instance)
+        await self.validate(data, 'virt_instance_update', verrors, old=instance)
         verrors.check()
 
         instance['raw']['config'].update(self.__data_to_config(data))