pc: Move acpi_data_size global to PCMachineClass

This way we don't need code in pc_compat_*() functions to set the legacy
acpi_data_size value.
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>
Reviewed-by: NMarcel Apfelbaum <marcel@redhat.com>

hw/i386/pc.c

@@ -77,15 +77,6 @@
 #define DPRINTF(fmt, ...)
 #endif
 
-/* Leave a chunk of memory at the top of RAM for the BIOS ACPI tables
- * (128K) and other BIOS datastructures (less than 4K reported to be used at
- * the moment, 32K should be enough for a while).  */
-static unsigned acpi_data_size = 0x20000 + 0x8000;
-void pc_set_legacy_acpi_data_size(void)
-{
-    acpi_data_size = 0x10000;
-}
-
 #define BIOS_CFG_IOPORT 0x510
 #define FW_CFG_ACPI_TABLES (FW_CFG_ARCH_LOCAL + 0)
 #define FW_CFG_SMBIOS_ENTRIES (FW_CFG_ARCH_LOCAL + 1)
@@ -841,6 +832,7 @@ static void load_linux(PCMachineState *pcms,
     FILE *f;
     char *vmode;
     MachineState *machine = MACHINE(pcms);
+    PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms);
     const char *kernel_filename = machine->kernel_filename;
     const char *initrd_filename = machine->initrd_filename;
     const char *kernel_cmdline = machine->kernel_cmdline;
@@ -908,8 +900,8 @@ static void load_linux(PCMachineState *pcms,
         initrd_max = 0x37ffffff;
     }
 
-    if (initrd_max >= pcms->below_4g_mem_size - acpi_data_size) {
-        initrd_max = pcms->below_4g_mem_size - acpi_data_size - 1;
+    if (initrd_max >= pcms->below_4g_mem_size - pcmc->acpi_data_size) {
+        initrd_max = pcms->below_4g_mem_size - pcmc->acpi_data_size - 1;
     }
 
     fw_cfg_add_i32(fw_cfg, FW_CFG_CMDLINE_ADDR, cmdline_addr);
@@ -1961,6 +1953,9 @@ static void pc_machine_class_init(ObjectClass *oc, void *data)
     pcmc->gigabyte_align = true;
     pcmc->has_reserved_memory = true;
     pcmc->kvmclock_enabled = true;
+    /* BIOS ACPI tables: 128K. Other BIOS datastructures: less than 4K reported
+     * to be used at the moment, 32K should be enough for a while.  */
+    pcmc->acpi_data_size = 0x20000 + 0x8000;
     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";

hw/i386/pc_piix.c

@@ -318,7 +318,6 @@ static void pc_compat_2_1(MachineState *machine)
 static void pc_compat_2_0(MachineState *machine)
 {
     pc_compat_2_1(machine);
-    pc_set_legacy_acpi_data_size();
 }
 
 static void pc_compat_1_7(MachineState *machine)
@@ -517,6 +516,7 @@ static void pc_i440fx_2_0_machine_options(MachineClass *m)
      * QEMU 1.7 it is 6414.  For RHEL/CentOS 7.0 it is 6418.
      */
     pcmc->legacy_acpi_table_size = 6652;
+    pcmc->acpi_data_size = 0x10000;
 }
 
 DEFINE_I440FX_MACHINE(v2_0, "pc-i440fx-2.0", pc_compat_2_0,

hw/i386/pc_q35.c

@@ -302,7 +302,6 @@ static void pc_compat_2_1(MachineState *machine)
 static void pc_compat_2_0(MachineState *machine)
 {
     pc_compat_2_1(machine);
-    pc_set_legacy_acpi_data_size();
 }
 
 static void pc_compat_1_7(MachineState *machine)
@@ -424,6 +423,7 @@ static void pc_q35_2_0_machine_options(MachineClass *m)
     SET_MACHINE_COMPAT(m, PC_COMPAT_2_0);
     pcmc->has_reserved_memory = false;
     pcmc->smbios_legacy_mode = true;
+    pcmc->acpi_data_size = 0x10000;
 }
 
 DEFINE_Q35_MACHINE(v2_0, "pc-q35-2.0", pc_compat_2_0,

include/hw/i386/pc.h

@@ -90,6 +90,10 @@ struct PCMachineClass {
     bool has_reserved_memory;
     bool kvmclock_enabled;
     int legacy_acpi_table_size;
+    /* Leave a chunk of memory at the top of RAM for the BIOS ACPI tables
+     * and other BIOS datastructures.
+     */
+    unsigned acpi_data_size;
 };
 
 #define TYPE_PC_MACHINE "generic-pc-machine"
@@ -201,8 +205,6 @@ void pc_acpi_init(const char *default_dsdt);
 
 PcGuestInfo *pc_guest_info_init(PCMachineState *pcms);
 
-void pc_set_legacy_acpi_data_size(void);
-
 #define PCI_HOST_PROP_PCI_HOLE_START   "pci-hole-start"
 #define PCI_HOST_PROP_PCI_HOLE_END     "pci-hole-end"
 #define PCI_HOST_PROP_PCI_HOLE64_START "pci-hole64-start"