pc: Eliminate pc_default_machine_options()

The only PC machines that didn't call pc_default_machine_options() were
isaps and xenfv. Both were already overwriting max_cpus, and only isapc
was not overwriting hot_add_cpu.

After making isapc set hot_add_cpu to NULL, we can move the
pc_default_machine_options() code the PC common class_init.
Signed-off-by: NEduardo Habkost <ehabkost@redhat.com>
Reviewed-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>

hw/i386/pc.c

@@ -1939,6 +1939,8 @@ static void pc_machine_class_init(ObjectClass *oc, void *data)
     mc->get_hotplug_handler = pc_get_hotpug_handler;
     mc->cpu_index_to_socket_id = pc_cpu_index_to_socket_id;
     mc->default_boot_order = "cad";
+    mc->hot_add_cpu = pc_hot_add_cpu;
+    mc->max_cpus = 255;
     hc->plug = pc_machine_device_plug_cb;
     hc->unplug_request = pc_machine_device_unplug_request_cb;
     hc->unplug = pc_machine_device_unplug_cb;

hw/i386/pc_piix.c

@@ -449,7 +449,6 @@ static void pc_xen_hvm_init(MachineState *machine)
 
 static void pc_i440fx_machine_options(MachineClass *m)
 {
-    pc_default_machine_options(m);
     m->family = "pc_piix";
     m->desc = "Standard PC (i440FX + PIIX, 1996)";
     m->hot_add_cpu = pc_hot_add_cpu;

hw/i386/pc_q35.c

@@ -363,7 +363,6 @@ static void pc_compat_1_4(MachineState *machine)
 
 static void pc_q35_machine_options(MachineClass *m)
 {
-    pc_default_machine_options(m);
     m->family = "pc_q35";
     m->desc = "Standard PC (Q35 + ICH9, 2009)";
     m->hot_add_cpu = pc_hot_add_cpu;

include/hw/i386/pc.h

@@ -699,12 +699,6 @@ bool e820_get_entry(int, uint32_t, uint64_t *, uint64_t *);
             .value = "off",\
         },
 
-static inline void pc_default_machine_options(MachineClass *m)
-{
-    m->hot_add_cpu = pc_hot_add_cpu;
-    m->max_cpus = 255;
-}
-
 #define DEFINE_PC_MACHINE(suffix, namestr, initfn, optsfn) \
     static void pc_machine_##suffix##_class_init(ObjectClass *oc, void *data) \
     { \