target/loongarch: cpu: Implement get_arch_id callback

Implement the callback for getting the architecture-dependent CPU
ID, the cpu ID is physical id described in ACPI MADT table, this
will be used for cpu hotplug.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Reviewed-by: Song Gao <gaosong@loongson.cn>
Message-Id: <20230824005007.2000525-1-maobibo@loongson.cn>
Signed-off-by: Song Gao <gaosong@loongson.cn>

hw/loongarch/virt.c

@@ -810,6 +810,8 @@ static void loongarch_init(MachineState *machine)
         cpu = cpu_create(machine->cpu_type);
         cpu->cpu_index = i;
         machine->possible_cpus->cpus[i].cpu = OBJECT(cpu);
+        lacpu = LOONGARCH_CPU(cpu);
+        lacpu->phy_id = machine->possible_cpus->cpus[i].arch_id;
     }
     fdt_add_cpu_nodes(lams);
 

target/loongarch/cpu.c

@@ -722,6 +722,13 @@ static struct TCGCPUOps loongarch_tcg_ops = {
 static const struct SysemuCPUOps loongarch_sysemu_ops = {
     .get_phys_page_debug = loongarch_cpu_get_phys_page_debug,
 };
+
+static int64_t loongarch_cpu_get_arch_id(CPUState *cs)
+{
+    LoongArchCPU *cpu = LOONGARCH_CPU(cs);
+
+    return cpu->phy_id;
+}
 #endif
 
 static void loongarch_cpu_class_init(ObjectClass *c, void *data)
@@ -742,6 +749,7 @@ static void loongarch_cpu_class_init(ObjectClass *c, void *data)
     cc->set_pc = loongarch_cpu_set_pc;
     cc->get_pc = loongarch_cpu_get_pc;
 #ifndef CONFIG_USER_ONLY
+    cc->get_arch_id = loongarch_cpu_get_arch_id;
     dc->vmsd = &vmstate_loongarch_cpu;
     cc->sysemu_ops = &loongarch_sysemu_ops;
 #endif

target/loongarch/cpu.h

@@ -376,6 +376,7 @@ struct ArchCPU {
     CPUNegativeOffsetState neg;
     CPULoongArchState env;
     QEMUTimer timer;
+    uint32_t  phy_id;
 
     /* 'compatible' string for this CPU for Linux device trees */
     const char *dtb_compatible;