failover: fix unplug pending detection

Failover needs to detect the end of the PCI unplug to start migration
after the VFIO card has been unplugged.

To do that, a flag is set in pcie_cap_slot_unplug_request_cb() and reset in
pcie_unplug_device().

But since
    17858a1 ("hw/acpi/ich9: Set ACPI PCI hot-plug as default on Q35")
we have switched to ACPI unplug and these functions are not called anymore
and the flag not set. So failover migration is not able to detect if card
is really unplugged and acts as it's done as soon as it's started. So it
doesn't wait the end of the unplug to start the migration. We don't see any
problem when we test that because ACPI unplug is faster than PCIe native
hotplug and when the migration really starts the unplug operation is
already done.

See c000a9b ("pci: mark device having guest unplug request pending")
    a99c4da ("pci: mark devices partially unplugged")

Signed-off-by: Laurent Vivier <[email protected]>
Reviewed-by: Ani Sinha <[email protected]>
Message-Id: <[email protected]>
Reviewed-by: Michael S. Tsirkin <[email protected]>
Signed-off-by: Michael S. Tsirkin <[email protected]>

hw/acpi/pcihp.c

@@ -222,9 +222,27 @@ 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)) {
-                hotplug_ctrl = qdev_get_hotplug_handler(qdev);
-                hotplug_handler_unplug(hotplug_ctrl, qdev, &error_abort);
-                object_unparent(OBJECT(qdev));
+                /*
+                 * partially_hotplugged is used by virtio-net failover:
+                 * failover has asked the guest OS to unplug the device
+                 * but we need to keep some references to the device
+                 * to be able to plug it back in case of failure so
+                 * we don't execute hotplug_handler_unplug().
+                 */
+                if (dev->partially_hotplugged) {
+                    /*
+                     * pending_deleted_event is set to true when
+                     * virtio-net failover asks to unplug the device,
+                     * and set to false here when the operation is done
+                     * This is used by the migration loop to detect the
+                     * end of the operation and really start the migration.
+                     */
+                    qdev->pending_deleted_event = false;
+                } else {
+                    hotplug_ctrl = qdev_get_hotplug_handler(qdev);
+                    hotplug_handler_unplug(hotplug_ctrl, qdev, &error_abort);
+                    object_unparent(OBJECT(qdev));
+                }
             }
         }
     }
@@ -396,6 +414,12 @@ void acpi_pcihp_device_unplug_request_cb(HotplugHandler *hotplug_dev,
         return;
     }
 
+    /*
+     * pending_deleted_event is used by virtio-net failover to detect the
+     * end of the unplug operation, the flag is set to false in
+     * acpi_pcihp_eject_slot() when the operation is completed.
+     */
+    pdev->qdev.pending_deleted_event = true;
     s->acpi_pcihp_pci_status[bsel].down |= (1U << slot);
     acpi_send_event(DEVICE(hotplug_dev), ACPI_PCI_HOTPLUG_STATUS);
 }