cpu/apic: drop icc bus/bridge

After CPU hotplug has been converted to BUS-less hot-plug infrastructure,
the only function ICC bus performs is to propagate reset to LAPICs. However
LAPIC could be reset by registering its reset handler after all device are
initialized.
Do so and drop ~30LOC of not needed anymore ICCBus related code.

Signed-off-by: Chen Fan <chen.fan.fnst@cn.fujitsu.com>
Signed-off-by: Zhu Guihua <zhugh.fnst@cn.fujitsu.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>

7 files changed, 14 insertions, 46 deletions

diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index 02e0b427ac..9275297adc 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -59,7 +59,6 @@
 #include "qemu/error-report.h"
 #include "hw/acpi/acpi.h"
 #include "hw/acpi/cpu_hotplug.h"
-#include "hw/cpu/icc_bus.h"
 #include "hw/boards.h"
 #include "hw/pci/pci_host.h"
 #include "acpi-build.h"
@@ -1052,23 +1051,16 @@ void pc_acpi_smi_interrupt(void *opaque, int irq, int level)
 }
 
 static X86CPU *pc_new_cpu(const char *cpu_model, int64_t apic_id,
-                          DeviceState *icc_bridge, Error **errp)
+                          Error **errp)
 {
     X86CPU *cpu = NULL;
     Error *local_err = NULL;
 
-    if (icc_bridge == NULL) {
-        error_setg(&local_err, "Invalid icc-bridge value");
-        goto out;
-    }
-
     cpu = cpu_x86_create(cpu_model, &local_err);
     if (local_err != NULL) {
         goto out;
     }
 
-    qdev_set_parent_bus(DEVICE(cpu), qdev_get_child_bus(icc_bridge, "icc"));
-
     object_property_set_int(OBJECT(cpu), apic_id, "apic-id", &local_err);
     object_property_set_bool(OBJECT(cpu), true, "realized", &local_err);
 
@@ -1085,7 +1077,6 @@ static const char *current_cpu_model;
 
 void pc_hot_add_cpu(const int64_t id, Error **errp)
 {
-    DeviceState *icc_bridge;
     X86CPU *cpu;
     int64_t apic_id = x86_cpu_apic_id_from_index(id);
     Error *local_err = NULL;
@@ -1114,9 +1105,7 @@ void pc_hot_add_cpu(const int64_t id, Error **errp)
         return;
     }
 
-    icc_bridge = DEVICE(object_resolve_path_type("icc-bridge",
-                                                 TYPE_ICC_BRIDGE, NULL));
-    cpu = pc_new_cpu(current_cpu_model, apic_id, icc_bridge, &local_err);
+    cpu = pc_new_cpu(current_cpu_model, apic_id, &local_err);
     if (local_err) {
         error_propagate(errp, local_err);
         return;
@@ -1124,7 +1113,7 @@ void pc_hot_add_cpu(const int64_t id, Error **errp)
     object_unref(OBJECT(cpu));
 }
 
-void pc_cpus_init(const char *cpu_model, DeviceState *icc_bridge)
+void pc_cpus_init(const char *cpu_model)
 {
     int i;
     X86CPU *cpu = NULL;
@@ -1150,7 +1139,7 @@ void pc_cpus_init(const char *cpu_model, DeviceState *icc_bridge)
 
     for (i = 0; i < smp_cpus; i++) {
         cpu = pc_new_cpu(cpu_model, x86_cpu_apic_id_from_index(i),
-                         icc_bridge, &error);
+                         &error);
         if (error) {
             error_report_err(error);
             exit(1);
diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index f6c7a4ab83..ae7bbebd0f 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -39,7 +39,6 @@
 #include "hw/kvm/clock.h"
 #include "sysemu/sysemu.h"
 #include "hw/sysbus.h"
-#include "hw/cpu/icc_bus.h"
 #include "sysemu/arch_init.h"
 #include "sysemu/block-backend.h"
 #include "hw/i2c/smbus.h"
@@ -98,7 +97,6 @@ static void pc_init1(MachineState *machine,
     MemoryRegion *ram_memory;
     MemoryRegion *pci_memory;
     MemoryRegion *rom_memory;
-    DeviceState *icc_bridge;
     PcGuestInfo *guest_info;
     ram_addr_t lowmem;
 
@@ -141,11 +139,7 @@ static void pc_init1(MachineState *machine,
         exit(1);
     }
 
-    icc_bridge = qdev_create(NULL, TYPE_ICC_BRIDGE);
-    object_property_add_child(qdev_get_machine(), "icc-bridge",
-                              OBJECT(icc_bridge), NULL);
-
-    pc_cpus_init(machine->cpu_model, icc_bridge);
+    pc_cpus_init(machine->cpu_model);
 
     if (kvm_enabled() && kvmclock_enabled) {
         kvmclock_create();
@@ -226,7 +220,6 @@ static void pc_init1(MachineState *machine,
     if (pci_enabled) {
         ioapic_init_gsi(gsi_state, "i440fx");
     }
-    qdev_init_nofail(icc_bridge);
 
     pc_register_ferr_irq(gsi[13]);
 
diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
index 4356728d18..19e66702e0 100644
--- a/hw/i386/pc_q35.c
+++ b/hw/i386/pc_q35.c
@@ -43,7 +43,6 @@
 #include "hw/ide/pci.h"
 #include "hw/ide/ahci.h"
 #include "hw/usb.h"
-#include "hw/cpu/icc_bus.h"
 #include "qemu/error-report.h"
 #include "migration/migration.h"
 
@@ -83,7 +82,6 @@ static void pc_q35_init(MachineState *machine)
     int i;
     ICH9LPCState *ich9_lpc;
     PCIDevice *ahci;
-    DeviceState *icc_bridge;
     PcGuestInfo *guest_info;
     ram_addr_t lowmem;
     DriveInfo *hd[MAX_SATA_PORTS];
@@ -130,11 +128,7 @@ static void pc_q35_init(MachineState *machine)
         exit(1);
     }
 
-    icc_bridge = qdev_create(NULL, TYPE_ICC_BRIDGE);
-    object_property_add_child(qdev_get_machine(), "icc-bridge",
-                              OBJECT(icc_bridge), NULL);
-
-    pc_cpus_init(machine->cpu_model, icc_bridge);
+    pc_cpus_init(machine->cpu_model);
     pc_acpi_init("q35-acpi-dsdt.aml");
 
     kvmclock_create();
@@ -236,7 +230,6 @@ static void pc_q35_init(MachineState *machine)
     if (pci_enabled) {
         ioapic_init_gsi(gsi_state, "q35");
     }
-    qdev_init_nofail(icc_bridge);
 
     pc_register_ferr_irq(gsi[13]);
 
diff --git a/hw/intc/apic_common.c b/hw/intc/apic_common.c
index c0b32eb8eb..ad959c4e77 100644
--- a/hw/intc/apic_common.c
+++ b/hw/intc/apic_common.c
@@ -419,13 +419,12 @@ static Property apic_properties_common[] = {
 
 static void apic_common_class_init(ObjectClass *klass, void *data)
 {
-    ICCDeviceClass *idc = ICC_DEVICE_CLASS(klass);
     DeviceClass *dc = DEVICE_CLASS(klass);
 
     dc->vmsd = &vmstate_apic_common;
     dc->reset = apic_reset_common;
     dc->props = apic_properties_common;
-    idc->realize = apic_common_realize;
+    dc->realize = apic_common_realize;
     /*
      * Reason: APIC and CPU need to be wired up by
      * x86_cpu_apic_create()
@@ -435,7 +434,7 @@ static void apic_common_class_init(ObjectClass *klass, void *data)
 
 static const TypeInfo apic_common_type = {
     .name = TYPE_APIC_COMMON,
-    .parent = TYPE_ICC_DEVICE,
+    .parent = TYPE_DEVICE,
     .instance_size = sizeof(APICCommonState),
     .class_size = sizeof(APICCommonClass),
     .class_init = apic_common_class_init,
diff --git a/include/hw/i386/apic_internal.h b/include/hw/i386/apic_internal.h
index 7813396e49..74fe935e8e 100644
--- a/include/hw/i386/apic_internal.h
+++ b/include/hw/i386/apic_internal.h
@@ -22,7 +22,6 @@
 
 #include "cpu.h"
 #include "exec/memory.h"
-#include "hw/cpu/icc_bus.h"
 #include "qemu/timer.h"
 
 /* APIC Local Vector Table */
@@ -135,7 +134,7 @@ typedef struct APICCommonState APICCommonState;
 
 typedef struct APICCommonClass
 {
-    ICCDeviceClass parent_class;
+    DeviceClass parent_class;
 
     DeviceRealize realize;
     void (*set_base)(APICCommonState *s, uint64_t val);
@@ -150,7 +149,9 @@ typedef struct APICCommonClass
 } APICCommonClass;
 
 struct APICCommonState {
-    ICCDevice busdev;
+    /*< private >*/
+    DeviceState parent_obj;
+    /*< public >*/
 
     MemoryRegion io_memory;
     X86CPU *cpu;
diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
index 8662a298f4..0503485cd0 100644
--- a/include/hw/i386/pc.h
+++ b/include/hw/i386/pc.h
@@ -168,7 +168,7 @@ bool pc_machine_is_smm_enabled(PCMachineState *pcms);
 void pc_register_ferr_irq(qemu_irq irq);
 void pc_acpi_smi_interrupt(void *opaque, int irq, int level);
 
-void pc_cpus_init(const char *cpu_model, DeviceState *icc_bridge);
+void pc_cpus_init(const char *cpu_model);
 void pc_hot_add_cpu(const int64_t id, Error **errp);
 void pc_acpi_init(const char *default_dsdt);
 
diff --git a/target-i386/cpu.c b/target-i386/cpu.c
index dba77d3eac..c793812cc2 100644
--- a/target-i386/cpu.c
+++ b/target-i386/cpu.c
@@ -43,7 +43,6 @@
 
 #include "sysemu/sysemu.h"
 #include "hw/qdev-properties.h"
-#include "hw/cpu/icc_bus.h"
 #ifndef CONFIG_USER_ONLY
 #include "exec/address-spaces.h"
 #include "hw/xen/xen.h"
@@ -2736,7 +2735,6 @@ static void mce_init(X86CPU *cpu)
 #ifndef CONFIG_USER_ONLY
 static void x86_cpu_apic_create(X86CPU *cpu, Error **errp)
 {
-    DeviceState *dev = DEVICE(cpu);
     APICCommonState *apic;
     const char *apic_type = "apic";
 
@@ -2746,11 +2744,7 @@ static void x86_cpu_apic_create(X86CPU *cpu, Error **errp)
         apic_type = "xen-apic";
     }
 
-    cpu->apic_state = qdev_try_create(qdev_get_parent_bus(dev), apic_type);
-    if (cpu->apic_state == NULL) {
-        error_setg(errp, "APIC device '%s' could not be created", apic_type);
-        return;
-    }
+    cpu->apic_state = DEVICE(object_new(apic_type));
 
     object_property_add_child(OBJECT(cpu), "apic",
                               OBJECT(cpu->apic_state), NULL);
@@ -3161,7 +3155,6 @@ static void x86_cpu_common_class_init(ObjectClass *oc, void *data)
 
     xcc->parent_realize = dc->realize;
     dc->realize = x86_cpu_realizefn;
-    dc->bus_type = TYPE_ICC_BUS;
     dc->props = x86_cpu_properties;
 
     xcc->parent_reset = cc->reset;