test: store uffd handler in microvm attribute

So that we can later refer to it in tests, for example to parse its
logs.

Signed-off-by: Patrick Roy <[email protected]>

Author: roypat

tests/framework/microvm.py

@@ -201,6 +201,7 @@ def __init__(
         self.ssh_key = None
         self.initrd_file = None
         self.boot_args = None
+        self.uffd_handler = None
 
         self.fc_binary_path = Path(fc_binary_path)
         assert fc_binary_path.exists()

tests/framework/utils_uffd.py

@@ -89,6 +89,7 @@ def spawn_pf_handler(vm, handler_path, mem_path):
         handler_name, SOCKET_PATH, jailed_mem, vm.chroot(), "uffd.log"
     )
     uffd_handler.spawn(vm.jailer.uid, vm.jailer.gid)
+    vm.uffd_handler = uffd_handler
 
     return uffd_handler