pci/pcihp: perform unplug via the hotplug handler

Introduce and use the "unplug" callback.

This is a preparation for multi-stage hotplug handlers, whereby the bus
hotplug handler is overwritten by the machine hotplug handler. This handler
will then pass control to the bus hotplug handler. So to get this running
cleanly, we also have to make sure to go via the hotplug handler chain when
actually unplugging a device after an unplug request. Lookup the hotplug
handler and call "unplug".

Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

3 files changed, 18 insertions, 3 deletions

diff --git a/hw/acpi/pcihp.c b/hw/acpi/pcihp.c
index 05e3f8d..7bc7a72 100644
--- a/hw/acpi/pcihp.c
+++ b/hw/acpi/pcihp.c
@@ -154,6 +154,7 @@ static bool acpi_pcihp_pc_no_hotplug(AcpiPciHpState *s, PCIDevice *dev)
 
 static void acpi_pcihp_eject_slot(AcpiPciHpState *s, unsigned bsel, unsigned slots)
 {
+    HotplugHandler *hotplug_ctrl;
     BusChild *kid, *next;
     int slot = ctz32(slots);
     PCIBus *bus = acpi_pcihp_find_hotplug_bus(s, bsel);
@@ -171,7 +172,8 @@ static void acpi_pcihp_eject_slot(AcpiPciHpState *s, unsigned bsel, unsigned slo
         PCIDevice *dev = PCI_DEVICE(qdev);
         if (PCI_SLOT(dev->devfn) == slot) {
             if (!acpi_pcihp_pc_no_hotplug(s, dev)) {
-                object_unparent(OBJECT(qdev));
+                hotplug_ctrl = qdev_get_hotplug_handler(qdev);
+                hotplug_handler_unplug(hotplug_ctrl, qdev, &error_abort);
             }
         }
     }
@@ -267,6 +269,13 @@ void acpi_pcihp_device_plug_cb(HotplugHandler *hotplug_dev, AcpiPciHpState *s,
 void acpi_pcihp_device_unplug_cb(HotplugHandler *hotplug_dev, AcpiPciHpState *s,
                                  DeviceState *dev, Error **errp)
 {
+    object_unparent(OBJECT(dev));
+}
+
+void acpi_pcihp_device_unplug_request_cb(HotplugHandler *hotplug_dev,
+                                         AcpiPciHpState *s, DeviceState *dev,
+                                         Error **errp)
+{
     PCIDevice *pdev = PCI_DEVICE(dev);
     int slot = PCI_SLOT(pdev->devfn);
     int bsel = acpi_pcihp_get_bsel(pci_get_bus(pdev));
diff --git a/hw/acpi/piix4.c b/hw/acpi/piix4.c
index 07dfeb0..88f9a9e 100644
--- a/hw/acpi/piix4.c
+++ b/hw/acpi/piix4.c
@@ -419,8 +419,8 @@ static void piix4_device_unplug_request_cb(HotplugHandler *hotplug_dev,
         acpi_memory_unplug_request_cb(hotplug_dev, &s->acpi_memory_hotplug,
                                       dev, errp);
     } else if (object_dynamic_cast(OBJECT(dev), TYPE_PCI_DEVICE)) {
-        acpi_pcihp_device_unplug_cb(hotplug_dev, &s->acpi_pci_hotplug, dev,
-                                    errp);
+        acpi_pcihp_device_unplug_request_cb(hotplug_dev, &s->acpi_pci_hotplug,
+                                            dev, errp);
     } else if (object_dynamic_cast(OBJECT(dev), TYPE_CPU) &&
                !s->cpu_hotplug_legacy) {
         acpi_cpu_unplug_request_cb(hotplug_dev, &s->cpuhp_state, dev, errp);
@@ -438,6 +438,9 @@ static void piix4_device_unplug_cb(HotplugHandler *hotplug_dev,
     if (s->acpi_memory_hotplug.is_enabled &&
         object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
         acpi_memory_unplug_cb(&s->acpi_memory_hotplug, dev, errp);
+    } else if (object_dynamic_cast(OBJECT(dev), TYPE_PCI_DEVICE)) {
+        acpi_pcihp_device_unplug_cb(hotplug_dev, &s->acpi_pci_hotplug, dev,
+                                    errp);
     } else if (object_dynamic_cast(OBJECT(dev), TYPE_CPU) &&
                !s->cpu_hotplug_legacy) {
         acpi_cpu_unplug_cb(&s->cpuhp_state, dev, errp);
diff --git a/include/hw/acpi/pcihp.h b/include/hw/acpi/pcihp.h
index ce31625..8bc4a4c 100644
--- a/include/hw/acpi/pcihp.h
+++ b/include/hw/acpi/pcihp.h
@@ -62,6 +62,9 @@ void acpi_pcihp_device_plug_cb(HotplugHandler *hotplug_dev, AcpiPciHpState *s,
                                DeviceState *dev, Error **errp);
 void acpi_pcihp_device_unplug_cb(HotplugHandler *hotplug_dev, AcpiPciHpState *s,
                                  DeviceState *dev, Error **errp);
+void acpi_pcihp_device_unplug_request_cb(HotplugHandler *hotplug_dev,
+                                         AcpiPciHpState *s, DeviceState *dev,
+                                         Error **errp);
 
 /* Called on reset */
 void acpi_pcihp_reset(AcpiPciHpState *s);