TPM needs to know its own base address in order to generate its DSDT
device entry.

Signed-off-by: Joelle van Dyne <j@getutm.app>
---
 hw/loongarch/virt.c | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/hw/loongarch/virt.c b/hw/loongarch/virt.c
index e19b042ce8..9c536c52bc 100644
--- a/hw/loongarch/virt.c
+++ b/hw/loongarch/virt.c
@@ -1040,6 +1040,37 @@ static void virt_mem_plug(HotplugHandler *hotplug_dev,
                          dev, &error_abort);
 }
 
+#ifdef CONFIG_TPM
+static void virt_tpm_plug(LoongArchMachineState *lams, TPMIf *tpmif)
+{
+    PlatformBusDevice *pbus = PLATFORM_BUS_DEVICE(lams->platform_bus_dev);
+    hwaddr pbus_base = VIRT_PLATFORM_BUS_BASEADDRESS;
+    SysBusDevice *sbdev = SYS_BUS_DEVICE(tpmif);
+    MemoryRegion *sbdev_mr;
+    hwaddr tpm_base;
+    uint64_t tpm_size;
+
+    if (!sbdev || !object_dynamic_cast(OBJECT(sbdev), TYPE_SYS_BUS_DEVICE)) {
+        return;
+    }
+
+    tpm_base = platform_bus_get_mmio_addr(pbus, sbdev, 0);
+    assert(tpm_base != -1);
+
+    tpm_base += pbus_base;
+
+    sbdev_mr = sysbus_mmio_get_region(sbdev, 0);
+    tpm_size = memory_region_size(sbdev_mr);
+
+    if (object_property_find(OBJECT(sbdev), "baseaddr")) {
+        object_property_set_uint(OBJECT(sbdev), "baseaddr", tpm_base, NULL);
+    }
+    if (object_property_find(OBJECT(sbdev), "size")) {
+        object_property_set_uint(OBJECT(sbdev), "size", tpm_size, NULL);
+    }
+}
+#endif
+
 static void loongarch_machine_device_plug_cb(HotplugHandler *hotplug_dev,
                                         DeviceState *dev, Error **errp)
 {
@@ -1054,6 +1085,12 @@ static void loongarch_machine_device_plug_cb(HotplugHandler *hotplug_dev,
     } else if (memhp_type_supported(dev)) {
         virt_mem_plug(hotplug_dev, dev, errp);
     }
+
+#ifdef CONFIG_TPM
+    if (object_dynamic_cast(OBJECT(dev), TYPE_TPM_IF)) {
+        virt_tpm_plug(lams, TPM_IF(dev));
+    }
+#endif
 }
 
 static HotplugHandler *virt_machine_get_hotplug_handler(MachineState *machine,
-- 
2.39.2 (Apple Git-143)