Add device passthrough support for libvirt platform

Implement device passthrough for libvirt platform
Use device pool and extend the functionality for libvirt platform
Schema change to configure device pool from runbook
Set each node context based on requirement for device pass-through

Signed-off-by: Smit Gardhariya <[email protected]>

lisa/sut_orchestrator/libvirt/ch_platform.py

@@ -118,6 +118,11 @@ def _create_node_domain_xml(
         os_kernel.text = node_context.firmware_path
 
         devices = ET.SubElement(domain, "devices")
+        if len(node_context.passthrough_devices) > 0:
+            devices = self.device_pool._add_device_passthrough_xml(
+                devices,
+                node_context,
+            )
 
         console = ET.SubElement(devices, "console")
         console.attrib["type"] = "pty"
@@ -171,6 +176,14 @@ def _create_domain_and_attach_logger(
             node_context.domain, node_context.console_log_file_path
         )
 
+        if len(node_context.passthrough_devices) > 0:
+            # Once libvirt domain is created, check if driver attached to device
+            # on the host is vfio-pci for PCI device passthrough to make sure if
+            # pass-through for PCI device is happened properly or not
+            self.device_pool._verify_device_passthrough_post_boot(
+                node_context=node_context,
+            )
+
     # Create the OS disk.
     def _create_node_os_disk(
         self, environment: Environment, log: Logger, node: Node

lisa/sut_orchestrator/libvirt/context.py

@@ -5,9 +5,10 @@
 
 from lisa.environment import Environment
 from lisa.node import Node
+from lisa.sut_orchestrator.util.schema import HostDevicePoolType
 
 from .console_logger import QemuConsoleLogger
-from .schema import DiskImageFormat
+from .schema import DeviceAddressSchema, DiskImageFormat
 
 
 @dataclass
@@ -33,6 +34,15 @@ class InitSystem:
     IGNITION: str = "ignition"
 
 
+@dataclass
+class DevicePassthroughContext:
+    pool_type: HostDevicePoolType = HostDevicePoolType.PCI_NIC
+    device_list: List[DeviceAddressSchema] = field(
+        default_factory=list,
+    )
+    managed: str = ""
+
+
 @dataclass
 class NodeContext:
     vm_name: str = ""
@@ -57,6 +67,11 @@ class NodeContext:
     console_logger: Optional[QemuConsoleLogger] = None
     domain: Optional[libvirt.virDomain] = None
 
+    # Device pass through configuration
+    passthrough_devices: List[DevicePassthroughContext] = field(
+        default_factory=list,
+    )
+
 
 def get_environment_context(environment: Environment) -> EnvironmentContext:
     return environment.get_context(EnvironmentContext)