hw/acpi/cpu: Have build_cpus_aml() take a build_madt_cpu_fn callback

build_cpus_aml() is architecture independent but needs to create architecture-
specific CPU AML. So far this was achieved by using a virtual method from
TYPE_ACPI_DEVICE_IF. However, build_cpus_aml() would resolve this interface from
global (!) state. This makes it quite incomprehensible where this interface
comes from (TYPE_PIIX4_PM?, TYPE_ICH9_LPC_DEVICE?, TYPE_ACPI_GED_X86?) an can
lead to crashes when the generic code is ported to new architectures.

So far, build_cpus_aml() is only called in architecture-specific code -- and
only in x86. We can therefore simply pass pc_madt_cpu_entry() as callback to
build_cpus_aml(). This is the same callback that would be used through
TYPE_ACPI_DEVICE_IF.

Signed-off-by: Bernhard Beschow <shentey@gmail.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20230908084234.17642-3-shentey@gmail.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

hw/acpi/cpu.c

@@ -338,7 +338,7 @@ const VMStateDescription vmstate_cpu_hotplug = {
 #define CPU_FW_EJECT_EVENT "CEJF"
 
 void build_cpus_aml(Aml *table, MachineState *machine, CPUHotplugFeatures opts,
-                    hwaddr io_base,
+                    build_madt_cpu_fn build_madt_cpu, hwaddr io_base,
                     const char *res_root,
                     const char *event_handler_method)
 {
@@ -353,8 +353,6 @@ void build_cpus_aml(Aml *table, MachineState *machine, CPUHotplugFeatures opts,
     MachineClass *mc = MACHINE_GET_CLASS(machine);
     const CPUArchIdList *arch_ids = mc->possible_cpu_arch_ids(machine);
     char *cphp_res_path = g_strdup_printf("%s." CPUHP_RES_DEVICE, res_root);
-    Object *obj = object_resolve_path_type("", TYPE_ACPI_DEVICE_IF, NULL);
-    AcpiDeviceIfClass *adevc = ACPI_DEVICE_IF_GET_CLASS(obj);
 
     cpu_ctrl_dev = aml_device("%s", cphp_res_path);
     {
@@ -664,9 +662,7 @@ void build_cpus_aml(Aml *table, MachineState *machine, CPUHotplugFeatures opts,
             aml_append(dev, method);
 
             /* build _MAT object */
-            assert(adevc && adevc->madt_cpu);
-            adevc->madt_cpu(i, arch_ids, madt_buf,
-                            true); /* set enabled flag */
+            build_madt_cpu(i, arch_ids, madt_buf, true); /* set enabled flag */
             aml_append(dev, aml_name_decl("_MAT",
                 aml_buffer(madt_buf->len, (uint8_t *)madt_buf->data)));
             g_array_free(madt_buf, true);

hw/i386/acpi-build.c

@@ -1550,8 +1550,8 @@ build_dsdt(GArray *table_data, BIOSLinker *linker,
             .smi_path = pm->smi_on_cpuhp ? "\\_SB.PCI0.SMI0.SMIC" : NULL,
             .fw_unplugs_cpu = pm->smi_on_cpu_unplug,
         };
-        build_cpus_aml(dsdt, machine, opts, pm->cpu_hp_io_base,
-                       "\\_SB.PCI0", "\\_GPE._E02");
+        build_cpus_aml(dsdt, machine, opts, pc_madt_cpu_entry,
+                       pm->cpu_hp_io_base, "\\_SB.PCI0", "\\_GPE._E02");
     }
 
     if (pcms->memhp_io_base && nr_mem) {

include/hw/acpi/cpu.h

@@ -15,6 +15,7 @@
 #include "hw/qdev-core.h"
 #include "hw/acpi/acpi.h"
 #include "hw/acpi/aml-build.h"
+#include "hw/boards.h"
 #include "hw/hotplug.h"
 
 typedef struct AcpiCpuStatus {
@@ -55,8 +56,11 @@ typedef struct CPUHotplugFeatures {
     const char *smi_path;
 } CPUHotplugFeatures;
 
+typedef void (*build_madt_cpu_fn)(int uid, const CPUArchIdList *apic_ids,
+                                  GArray *entry, bool force_enabled);
+
 void build_cpus_aml(Aml *table, MachineState *machine, CPUHotplugFeatures opts,
-                    hwaddr io_base,
+                    build_madt_cpu_fn build_madt_cpu, hwaddr io_base,
                     const char *res_root,
                     const char *event_handler_method);