For loongarch virt machine, add powerdown notification callback
and send ACPI_POWER_DOWN_STATUS event by acpi ged. Also add
acpi dsdt table for ACPI_POWER_BUTTON_DEVICE device in this
patch.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Song Gao <gaosong@loongson.cn>
---
 hw/loongarch/acpi-build.c   |  1 +
 hw/loongarch/virt.c         | 12 ++++++++++++
 include/hw/loongarch/virt.h |  1 +
 3 files changed, 14 insertions(+)

diff --git a/hw/loongarch/acpi-build.c b/hw/loongarch/acpi-build.c
index 8aed50e858..6cb2472d33 100644
--- a/hw/loongarch/acpi-build.c
+++ b/hw/loongarch/acpi-build.c
@@ -260,6 +260,7 @@ build_la_ged_aml(Aml *dsdt, MachineState *machine)
                                  AML_SYSTEM_MEMORY,
                                  VIRT_GED_MEM_ADDR);
     }
+    acpi_dsdt_add_power_button(dsdt);
 }
 
 static void build_pci_device_aml(Aml *scope, LoongArchMachineState *lams)
diff --git a/hw/loongarch/virt.c b/hw/loongarch/virt.c
index 49d25059f8..38ef7cc49f 100644
--- a/hw/loongarch/virt.c
+++ b/hw/loongarch/virt.c
@@ -316,6 +316,14 @@ static void virt_machine_done(Notifier *notifier, void *data)
     loongarch_acpi_setup(lams);
 }
 
+static void virt_powerdown_req(Notifier *notifier, void *opaque)
+{
+    LoongArchMachineState *s = container_of(notifier,
+                                   LoongArchMachineState, powerdown_notifier);
+
+    acpi_send_event(s->acpi_ged, ACPI_POWER_DOWN_STATUS);
+}
+
 struct memmap_entry {
     uint64_t address;
     uint64_t length;
@@ -859,6 +867,10 @@ static void loongarch_init(MachineState *machine)
                                    VIRT_PLATFORM_BUS_IRQ);
     lams->machine_done.notify = virt_machine_done;
     qemu_add_machine_init_done_notifier(&lams->machine_done);
+     /* connect powerdown request */
+    lams->powerdown_notifier.notify = virt_powerdown_req;
+    qemu_register_powerdown_notifier(&lams->powerdown_notifier);
+
     fdt_add_pcie_node(lams);
     /*
      * Since lowmem region starts from 0 and Linux kernel legacy start address
diff --git a/include/hw/loongarch/virt.h b/include/hw/loongarch/virt.h
index f5f818894e..7ae8a91229 100644
--- a/include/hw/loongarch/virt.h
+++ b/include/hw/loongarch/virt.h
@@ -45,6 +45,7 @@ struct LoongArchMachineState {
     /* State for other subsystems/APIs: */
     FWCfgState  *fw_cfg;
     Notifier     machine_done;
+    Notifier     powerdown_notifier;
     OnOffAuto    acpi;
     char         *oem_id;
     char         *oem_table_id;
-- 
2.31.1