SMMUv3 devices with acceleration may enable CMDQV extensions
after device realize. In that case, additional MMIO regions and
IRQ lines may be registered but not yet mapped to the platform bus.

Ensure SMMUv3 device resources are linked to the platform bus
during machine_done().

This is safe to do unconditionally since the platform bus helpers
skip resources that are already mapped.

Signed-off-by: Shameer Kolothum <skolothumtho@nvidia.com>
---
 hw/arm/virt.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/hw/arm/virt.c b/hw/arm/virt.c
index 292e523664..c75a8d6e9e 100644
--- a/hw/arm/virt.c
+++ b/hw/arm/virt.c
@@ -1833,6 +1833,24 @@ static void virt_build_smbios(VirtMachineState *vms)
     }
 }
 
+/*
+ * SMMUv3 devices with acceleration may enable CMDQV extensions
+ * after device realize. In that case, additional MMIO regions and
+ * IRQ lines may be registered but not yet mapped to the platform bus.
+ *
+ * Ensure all resources are linked to the platform bus before final
+ * machine setup.
+ */
+
+static void virt_smmuv3_dev_link_cmdqv(VirtMachineState *vms)
+{
+    for (int i = 0; i < vms->smmuv3_devices->len; i++) {
+        DeviceState *dev = g_ptr_array_index(vms->smmuv3_devices, i);
+        platform_bus_link_device(PLATFORM_BUS_DEVICE(vms->platform_bus_dev),
+                                 SYS_BUS_DEVICE(dev));
+    }
+}
+
 static
 void virt_machine_done(Notifier *notifier, void *data)
 {
@@ -1849,6 +1867,9 @@ void virt_machine_done(Notifier *notifier, void *data)
     if (vms->cxl_devices_state.is_enabled) {
         cxl_fmws_link_targets(&error_fatal);
     }
+
+    virt_smmuv3_dev_link_cmdqv(vms);
+
     /*
      * If the user provided a dtb, we assume the dynamic sysbus nodes
      * already are integrated there. This corresponds to a use case where
-- 
2.43.0