pc: Update rtc_cmos in pc_cpu_plug

Update rtc_cmos in pc_cpu_plug() directly, instead of the notifier.
Reviewed-by: NIgor Mammedov <imammedo@redhat.com>
Signed-off-by: NGu Zheng <guz.fnst@cn.fujitsu.com>
Acked-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
Reviewed-by: NIgor Mammedov <imammedo@redhat.com>

hw/i386/pc.c

@@ -355,30 +355,15 @@ static void pc_cmos_init_late(void *opaque)
     qemu_unregister_reset(pc_cmos_init_late, opaque);
 }
 
-typedef struct RTCCPUHotplugArg {
-    Notifier cpu_added_notifier;
-    ISADevice *rtc_state;
-} RTCCPUHotplugArg;
-
-static void rtc_notify_cpu_added(Notifier *notifier, void *data)
-{
-    RTCCPUHotplugArg *arg = container_of(notifier, RTCCPUHotplugArg,
-                                         cpu_added_notifier);
-    ISADevice *s = arg->rtc_state;
-
-    /* increment the number of CPUs */
-    rtc_set_memory(s, 0x5f, rtc_get_memory(s, 0x5f) + 1);
-}
-
 void pc_cmos_init(ram_addr_t ram_size, ram_addr_t above_4g_mem_size,
-                  const char *boot_device,
+                  const char *boot_device, MachineState *machine,
                   ISADevice *floppy, BusState *idebus0, BusState *idebus1,
                   ISADevice *s)
 {
     int val, nb, i;
     FDriveType fd_type[2] = { FDRIVE_DRV_NONE, FDRIVE_DRV_NONE };
     static pc_cmos_init_late_arg arg;
-    static RTCCPUHotplugArg cpu_hotplug_cb;
+    PCMachineState *pc_machine = PC_MACHINE(machine);
 
     /* various important CMOS locations needed by PC/Bochs bios */
 
@@ -417,10 +402,14 @@ void pc_cmos_init(ram_addr_t ram_size, ram_addr_t above_4g_mem_size,
 
     /* set the number of CPU */
     rtc_set_memory(s, 0x5f, smp_cpus - 1);
-    /* init CPU hotplug notifier */
-    cpu_hotplug_cb.rtc_state = s;
-    cpu_hotplug_cb.cpu_added_notifier.notify = rtc_notify_cpu_added;
-    qemu_register_cpu_added_notifier(&cpu_hotplug_cb.cpu_added_notifier);
+
+    object_property_add_link(OBJECT(machine), "rtc_state",
+                             TYPE_ISA_DEVICE,
+                             (Object **)&pc_machine->rtc,
+                             object_property_allow_set_link,
+                             OBJ_PROP_LINK_UNREF_ON_RELEASE, &error_abort);
+    object_property_set_link(OBJECT(machine), OBJECT(s),
+                             "rtc_state", &error_abort);
 
     if (set_boot_dev(s, boot_device)) {
         exit(1);
@@ -1637,6 +1626,12 @@ static void pc_cpu_plug(HotplugHandler *hotplug_dev,
 
     hhc = HOTPLUG_HANDLER_GET_CLASS(pcms->acpi_dev);
     hhc->plug(HOTPLUG_HANDLER(pcms->acpi_dev), dev, &local_err);
+    if (local_err) {
+        goto out;
+    }
+
+    /* increment the number of CPUs */
+    rtc_set_memory(pcms->rtc, 0x5f, rtc_get_memory(pcms->rtc, 0x5f) + 1);
 out:
     error_propagate(errp, local_err);
 }

hw/i386/pc_piix.c

@@ -266,7 +266,7 @@ static void pc_init1(MachineState *machine,
     }
 
     pc_cmos_init(below_4g_mem_size, above_4g_mem_size, machine->boot_order,
-                 floppy, idebus[0], idebus[1], rtc_state);
+                 machine, floppy, idebus[0], idebus[1], rtc_state);
 
     if (pci_enabled && usb_enabled(false)) {
         pci_create_simple(pci_bus, piix3_devfn + 2, "piix3-usb-uhci");

hw/i386/pc_q35.c

@@ -270,7 +270,7 @@ static void pc_q35_init(MachineState *machine)
                       8, NULL, 0);
 
     pc_cmos_init(below_4g_mem_size, above_4g_mem_size, machine->boot_order,
-                 floppy, idebus[0], idebus[1], rtc_state);
+                 machine, floppy, idebus[0], idebus[1], rtc_state);
 
     /* the rest devices to which pci devfn is automatically assigned */
     pc_vga_init(isa_bus, host_bus);

include/hw/i386/pc.h

@@ -34,6 +34,7 @@ struct PCMachineState {
     MemoryRegion hotplug_memory;
 
     HotplugHandler *acpi_dev;
+    ISADevice *rtc;
 
     uint64_t max_ram_below_4g;
 };
@@ -211,7 +212,7 @@ void pc_basic_device_init(ISABus *isa_bus, qemu_irq *gsi,
                           uint32 hpet_irqs);
 void pc_init_ne2k_isa(ISABus *bus, NICInfo *nd);
 void pc_cmos_init(ram_addr_t ram_size, ram_addr_t above_4g_mem_size,
-                  const char *boot_device,
+                  const char *boot_device, MachineState *machine,
                   ISADevice *floppy, BusState *ide0, BusState *ide1,
                   ISADevice *s);
 void pc_nic_init(ISABus *isa_bus, PCIBus *pci_bus);