vbox6: machine power-down support

Use 'StateChange' event to check for machine's 'PowerOff' state, close
Gui connections and submit exit signal to EP which in turns calls exit.

Fixes #4291

repos/ports/src/virtualbox6/main.cc

@@ -232,6 +232,8 @@ struct Main : Event_handler
 			}
 		}
 
+		void destruct_rom() { _rom.destruct(); }
+
 		void update_guest(bool enabled) { _guest = enabled; }
 
 		bool update_from_rom()
@@ -262,6 +264,8 @@ struct Main : Event_handler
 
 	Mouse_shape _mouse_shape { _env };
 
+	Signal_handler<Main> _exit_handler { _env.ep(), *this, &Main::_handle_exit };
+
 	Registry<Registered<Gui::Connection>> _gui_connections { };
 
 	Signal_handler<Main> _input_handler { _env.ep(), *this, &Main::_handle_input };
@@ -324,6 +328,20 @@ struct Main : Event_handler
 		}
 	}
 
+	void _power_down_machine()
+	{
+		_capslock.destruct_rom();
+
+		_gui_connections.for_each([&] (Gui::Connection &gui) {
+			delete &gui;
+		});
+
+		/* signal exit to main entrypoint */
+		_exit_handler.local_submit();
+	}
+
+	void _handle_exit() { _env.parent().exit(0); }
+
 	void handle_vbox_event(VBoxEventType_T, IEvent &) override;
 
 	bool const _vbox_event_handler_installed = ( _install_vbox_event_handler(), true );
@@ -342,6 +360,7 @@ struct Main : Event_handler
 		event_types.push_back(VBoxEventType_OnMouseCapabilityChanged);
 		event_types.push_back(VBoxEventType_OnMousePointerShapeChanged);
 		event_types.push_back(VBoxEventType_OnKeyboardLedsChanged);
+		event_types.push_back(VBoxEventType_OnStateChanged);
 
 		ievent_source->RegisterListener(listener, ComSafeArrayAsInParam(event_types), true);
 	}
@@ -449,6 +468,17 @@ void Main::handle_vbox_event(VBoxEventType_T ev_type, IEvent &ev)
 			_capslock.update_guest(!!capslock);
 		} break;
 
+	case VBoxEventType_OnStateChanged:
+		{
+			ComPtr<IStateChangedEvent> state_change_ev = &ev;
+			MachineState_T machineState;
+			state_change_ev->COMGETTER(State)(&machineState);
+
+			if (machineState == MachineState_PoweredOff)
+				_power_down_machine();
+
+		} break;
+
 	default: /* ignore other events */ break;
 	}
 }

repos/ports/src/virtualbox6/nem.cc

@@ -228,7 +228,7 @@ int nemR3NativeInitCompleted(PVM pVM, VMINITCOMPLETED enmWhat)
 }
 
 
-int nemR3NativeTerm(PVM pVM) STOP
+int nemR3NativeTerm(PVM pVM) TRACE(VINF_SUCCESS)
 
 
 /**

repos/ports/src/virtualbox6/sup.cc

@@ -631,6 +631,15 @@ static void ioctl(SUPCALLVMMR0 &request)
 		rc = vmmr0_vmmr0_init_emt(request.u.In.pVMR0, request.u.In.idCpu);
 		return;
 
+	/* XXX ignore ioctls called during poweroff */
+	case VMMR0_DO_GVMM_DEREGISTER_VMCPU:
+	case VMMR0_DO_VMMR0_TERM:
+	case VMMR0_DO_PGM_FLUSH_HANDY_PAGES:
+	case VMMR0_DO_GMM_BALLOONED_PAGES:
+	case VMMR0_DO_GMM_RESET_SHARED_MODULES:
+		rc = VINF_SUCCESS;
+		return;
+
 	default:
 		error(__func__, " operation=", (int)operation);
 		rc = VERR_NOT_IMPLEMENTED;
@@ -667,6 +676,13 @@ static void ioctl(SUPGETPAGINGMODE &request)
 }
 
 
+static void ioctl(SUPPAGEFREE &request)
+{
+	warning("SUPPAGEFREE called");
+	request.Hdr.rc = VINF_SUCCESS;
+}
+
+
 static void ioctl(SUPPAGEALLOCEX &request)
 {
 	/*
@@ -739,6 +755,7 @@ int suplibOsIOCtl(PSUPLIBDATA pThis, uintptr_t opcode, void *req, size_t len)
 	case SUP_CTL_CODE_NO_SIZE(SUP_IOCTL_GET_PAGING_MODE):      ioctl(*(SUPGETPAGINGMODE *)req); break;
 	case SUP_CTL_CODE_NO_SIZE(SUP_IOCTL_PAGE_ALLOC_EX):        ioctl(*(SUPPAGEALLOCEX   *)req); break;
 	case SUP_CTL_CODE_NO_SIZE(SUP_IOCTL_SET_VM_FOR_FAST):      ioctl(*(SUPSETVMFORFAST  *)req); break;
+	case SUP_CTL_CODE_NO_SIZE(SUP_IOCTL_PAGE_FREE):            ioctl(*(SUPPAGEFREE      *)req); break;
 
 	default: