machine: introduce MachineInitPhase

Generalize the qdev_hotplug variable to the different phases of
machine initialization.  We would like to allow different
monitor commands depending on the phase.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

6 files changed, 23 insertions, 13 deletions

diff --git a/hw/core/machine-qmp-cmds.c b/hw/core/machine-qmp-cmds.c
index cb9387c..87f1414 100644
--- a/hw/core/machine-qmp-cmds.c
+++ b/hw/core/machine-qmp-cmds.c
@@ -286,9 +286,9 @@ HotpluggableCPUList *qmp_query_hotpluggable_cpus(Error **errp)
 
 void qmp_set_numa_node(NumaOptions *cmd, Error **errp)
 {
-    if (qdev_hotplug) {
-         error_setg(errp, "The command is permitted only before the machine has been created");
-         return;
+    if (phase_check(PHASE_MACHINE_INITIALIZED)) {
+        error_setg(errp, "The command is permitted only before the machine has been created");
+        return;
     }
 
     set_numa_options(MACHINE(qdev_get_machine()), cmd, errp);
diff --git a/hw/core/machine.c b/hw/core/machine.c
index 07268af..607eb88 100644
--- a/hw/core/machine.c
+++ b/hw/core/machine.c
@@ -1174,17 +1174,16 @@ void machine_run_board_init(MachineState *machine)
     }
 
     machine_class->init(machine);
+    phase_advance(PHASE_MACHINE_INITIALIZED);
 }
 
 static NotifierList machine_init_done_notifiers =
     NOTIFIER_LIST_INITIALIZER(machine_init_done_notifiers);
 
-static bool machine_init_done;
-
 void qemu_add_machine_init_done_notifier(Notifier *notify)
 {
     notifier_list_add(&machine_init_done_notifiers, notify);
-    if (machine_init_done) {
+    if (phase_check(PHASE_MACHINE_READY)) {
         notify->notify(notify, NULL);
     }
 }
@@ -1207,7 +1206,7 @@ void qdev_machine_creation_done(void)
      * ok, initial machine setup is done, starting from now we can
      * only create hotpluggable devices
      */
-    qdev_hotplug = true;
+    phase_advance(PHASE_MACHINE_READY);
     qdev_assert_realized_properly();
 
     /* TODO: once all bus devices are qdevified, this should be done
@@ -1222,7 +1221,6 @@ void qdev_machine_creation_done(void)
      */
     qemu_register_reset(resettable_cold_reset_fn, sysbus_get_default());
 
-    machine_init_done = true;
     notifier_list_notify(&machine_init_done_notifiers, NULL);
 
     if (rom_check_and_register_reset() != 0) {
diff --git a/hw/core/qdev.c b/hw/core/qdev.c
index dddb0b2..cefc5ea 100644
--- a/hw/core/qdev.c
+++ b/hw/core/qdev.c
@@ -41,7 +41,6 @@
 #include "migration/vmstate.h"
 #include "trace.h"
 
-bool qdev_hotplug = false;
 static bool qdev_hot_added = false;
 bool qdev_hot_removed = false;
 
@@ -905,7 +904,7 @@ static void device_initfn(Object *obj)
 {
     DeviceState *dev = DEVICE(obj);
 
-    if (qdev_hotplug) {
+    if (phase_check(PHASE_MACHINE_READY)) {
         dev->hotplugged = 1;
         qdev_hot_added = true;
     }
@@ -1138,6 +1137,19 @@ Object *qdev_get_machine(void)
     return dev;
 }
 
+static MachineInitPhase machine_phase;
+
+bool phase_check(MachineInitPhase phase)
+{
+    return machine_phase >= phase;
+}
+
+void phase_advance(MachineInitPhase phase)
+{
+    assert(machine_phase == phase - 1);
+    machine_phase = phase;
+}
+
 static const TypeInfo device_type_info = {
     .name = TYPE_DEVICE,
     .parent = TYPE_OBJECT,
diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index 9424231..d4349ea 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -1062,7 +1062,7 @@ static PCIDevice *do_pci_register_device(PCIDevice *pci_dev,
     address_space_init(&pci_dev->bus_master_as,
                        &pci_dev->bus_master_container_region, pci_dev->name);
 
-    if (qdev_hotplug) {
+    if (phase_check(PHASE_MACHINE_READY)) {
         pci_init_bus_master(pci_dev);
     }
     pci_dev->irq_state = 0;
diff --git a/hw/usb/core.c b/hw/usb/core.c
index 5234dcc..e960036 100644
--- a/hw/usb/core.c
+++ b/hw/usb/core.c
@@ -97,7 +97,7 @@ void usb_wakeup(USBEndpoint *ep, unsigned int stream)
     USBDevice *dev = ep->dev;
     USBBus *bus = usb_bus_from_device(dev);
 
-    if (!qdev_hotplug) {
+    if (!phase_check(PHASE_MACHINE_READY)) {
         /*
          * This is machine init cold plug.  No need to wakeup anyone,
          * all devices will be reset anyway.  And trying to wakeup can
diff --git a/hw/virtio/virtio-iommu.c b/hw/virtio/virtio-iommu.c
index cea8811..6b9ef7f 100644
--- a/hw/virtio/virtio-iommu.c
+++ b/hw/virtio/virtio-iommu.c
@@ -930,7 +930,7 @@ static int virtio_iommu_set_page_size_mask(IOMMUMemoryRegion *mr,
      * accept it. Having a different masks is possible but the guest will use
      * sub-optimal block sizes, so warn about it.
      */
-    if (qdev_hotplug) {
+    if (phase_check(PHASE_MACHINE_READY)) {
         int new_granule = ctz64(new_mask);
         int cur_granule = ctz64(cur_mask);