hw: Move the default NIC machine class setting from the x86 to the generic one

We are going to re-use this setting for other targets, so let's
move this to the main MachineClass.

Message-Id: <20230512124033.502654-4-thuth@redhat.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

hw/i386/pc.c

@@ -1364,12 +1364,13 @@ void pc_basic_device_init(struct PCMachineState *pcms,
 
 void pc_nic_init(PCMachineClass *pcmc, ISABus *isa_bus, PCIBus *pci_bus)
 {
+    MachineClass *mc = MACHINE_CLASS(pcmc);
     int i;
 
     rom_set_order_override(FW_CFG_ORDER_OVERRIDE_NIC);
     for (i = 0; i < nb_nics; i++) {
         NICInfo *nd = &nd_table[i];
-        const char *model = nd->model ? nd->model : pcmc->default_nic_model;
+        const char *model = nd->model ? nd->model : mc->default_nic;
 
         if (g_str_equal(model, "ne2k_isa")) {
             pc_init_ne2k_isa(isa_bus, nd);

hw/i386/pc_piix.c

@@ -450,7 +450,6 @@ static void pc_xen_hvm_init(MachineState *machine)
 static void pc_i440fx_machine_options(MachineClass *m)
 {
     PCMachineClass *pcmc = PC_MACHINE_CLASS(m);
-    pcmc->default_nic_model = "e1000";
     pcmc->pci_root_uid = 0;
     pcmc->default_cpu_version = 1;
 
@@ -458,6 +457,7 @@ static void pc_i440fx_machine_options(MachineClass *m)
     m->desc = "Standard PC (i440FX + PIIX, 1996)";
     m->default_machine_opts = "firmware=bios-256k.bin";
     m->default_display = "std";
+    m->default_nic = "e1000";
     machine_class_allow_dynamic_sysbus_dev(m, TYPE_RAMFB_DEVICE);
     machine_class_allow_dynamic_sysbus_dev(m, TYPE_VMBUS_BRIDGE);
 }
@@ -884,7 +884,7 @@ static void isapc_machine_options(MachineClass *m)
     pcmc->gigabyte_align = false;
     pcmc->smbios_legacy_mode = true;
     pcmc->has_reserved_memory = false;
-    pcmc->default_nic_model = "ne2k_isa";
+    m->default_nic = "ne2k_isa";
     m->default_cpu_type = X86_CPU_TYPE_NAME("486");
 }
 

hw/i386/pc_q35.c

@@ -356,7 +356,6 @@ static void pc_q35_init(MachineState *machine)
 static void pc_q35_machine_options(MachineClass *m)
 {
     PCMachineClass *pcmc = PC_MACHINE_CLASS(m);
-    pcmc->default_nic_model = "e1000e";
     pcmc->pci_root_uid = 0;
     pcmc->default_cpu_version = 1;
 
@@ -365,6 +364,7 @@ static void pc_q35_machine_options(MachineClass *m)
     m->units_per_default_bus = 1;
     m->default_machine_opts = "firmware=bios-256k.bin";
     m->default_display = "std";
+    m->default_nic = "e1000e";
     m->default_kernel_irqchip_split = false;
     m->no_floppy = 1;
     machine_class_allow_dynamic_sysbus_dev(m, TYPE_AMD_IOMMU_DEVICE);
@@ -577,10 +577,8 @@ DEFINE_Q35_MACHINE(v2_12, "pc-q35-2.12", NULL,
 
 static void pc_q35_2_11_machine_options(MachineClass *m)
 {
-    PCMachineClass *pcmc = PC_MACHINE_CLASS(m);
-
     pc_q35_2_12_machine_options(m);
-    pcmc->default_nic_model = "e1000";
+    m->default_nic = "e1000";
     compat_props_add(m->compat_props, hw_compat_2_11, hw_compat_2_11_len);
     compat_props_add(m->compat_props, pc_compat_2_11, pc_compat_2_11_len);
 }

include/hw/boards.h

@@ -253,6 +253,7 @@ struct MachineClass {
     const char *default_machine_opts;
     const char *default_boot_order;
     const char *default_display;
+    const char *default_nic;
     GPtrArray *compat_props;
     const char *hw_version;
     ram_addr_t default_ram_size;

include/hw/i386/pc.h

@@ -93,7 +93,6 @@ struct PCMachineClass {
     /* Device configuration: */
     bool pci_enabled;
     bool kvmclock_enabled;
-    const char *default_nic_model;
 
     /* Compat options: */