[RFC PATCH v2 29/30] hw/loongarch: Add machine->possible_cpus

[Xiaojuan Yang]

Use possible_cpus for storing possible topology info

Signed-off-by: Xiaojuan Yang <yangxiaojuan@loongson.cn>
Signed-off-by: Song Gao <gaosong@loongson.cn>
---
 hw/loongarch/acpi-build.c    | 16 ++++++++++------
 hw/loongarch/ls3a5000_virt.c | 35 ++++++++++++++++++++++++++++++++++-
 2 files changed, 44 insertions(+), 7 deletions(-)

diff --git a/hw/loongarch/acpi-build.c b/hw/loongarch/acpi-build.c
index fda4d55f2e..5f1d4070d8 100644
--- a/hw/loongarch/acpi-build.c
+++ b/hw/loongarch/acpi-build.c
@@ -107,7 +107,8 @@ build_facs(GArray *table_data)
 static void
 build_madt(GArray *table_data, BIOSLinker *linker, LoongArchMachineState *lams)
 {
-    MachineState *ms = MACHINE(lams);
+    MachineClass *mc = MACHINE_GET_CLASS(lams);
+    const CPUArchIdList *core_ids = mc->possible_cpu_arch_ids(MACHINE(lams));
     int i;
     AcpiTable table = { .sig = "APIC", .rev = 1, .oem_id = lams->oem_id,
                         .oem_table_id = lams->oem_table_id };
@@ -118,13 +119,14 @@ build_madt(GArray *table_data, BIOSLinker *linker, 
LoongArchMachineState *lams)
     build_append_int_noprefix(table_data, 0, 4);
     build_append_int_noprefix(table_data, 1 /* PCAT_COMPAT */, 4); /* Flags */
 
-    for (i = 0; i < ms->smp.cpus; i++) {
+    for (i = 0; i < core_ids->len; i++) {
+        uint32_t core_id = core_ids->cpus[i].arch_id;
         /* Rev 1.0b, Table 5-13 Processor Core Interrupt Controller Structure 
*/
         build_append_int_noprefix(table_data, 17, 1);       /* Type */
         build_append_int_noprefix(table_data, 15, 1);       /* Length */
         build_append_int_noprefix(table_data, 1, 1);       /* Version */
         build_append_int_noprefix(table_data, i + 1, 4);     /* ACPI Processor 
ID */
-        build_append_int_noprefix(table_data, i, 4); /* Core ID */
+        build_append_int_noprefix(table_data, core_id, 4); /* Core ID */
         build_append_int_noprefix(table_data, 1, 4); /* Flags */
     }
 
@@ -164,8 +166,9 @@ static void
 build_srat(GArray *table_data, BIOSLinker *linker, MachineState *machine)
 {
     uint64_t i, mem_len, mem_base;
+    MachineClass *mc = MACHINE_GET_CLASS(machine);
     LoongArchMachineState *lams = LOONGARCH_MACHINE(machine);
-    MachineState *ms = MACHINE(lams);
+    const CPUArchIdList *core_ids = mc->possible_cpu_arch_ids(machine);
     AcpiTable table = { .sig = "SRAT", .rev = 1, .oem_id = lams->oem_id,
                         .oem_table_id = lams->oem_table_id };
 
@@ -173,13 +176,14 @@ build_srat(GArray *table_data, BIOSLinker *linker, 
MachineState *machine)
     build_append_int_noprefix(table_data, 1, 4); /* Reserved */
     build_append_int_noprefix(table_data, 0, 8); /* Reserved */
 
-    for (i = 0; i < ms->smp.cpus; ++i) {
+    for (i = 0; i < core_ids->len; ++i) {
+        uint32_t core_id = cpu_to_le32(core_ids->cpus[i].arch_id);
         /* 5.2.15.1 Processor Local APIC/SAPIC Affinity Structure */
         build_append_int_noprefix(table_data, 0, 1);  /* Type  */
         build_append_int_noprefix(table_data, 16, 1); /* Length */
         /* Proximity Domain [7:0] */
         build_append_int_noprefix(table_data, 0, 1);
-        build_append_int_noprefix(table_data, i, 1); /* APIC ID */
+        build_append_int_noprefix(table_data, core_id, 1); /* APIC ID */
         /* Flags, Table 5-36 */
         build_append_int_noprefix(table_data, 1, 4);
         build_append_int_noprefix(table_data, 0, 1); /* Local SAPIC EID */
diff --git a/hw/loongarch/ls3a5000_virt.c b/hw/loongarch/ls3a5000_virt.c
index 35222f70a4..768af074f4 100644
--- a/hw/loongarch/ls3a5000_virt.c
+++ b/hw/loongarch/ls3a5000_virt.c
@@ -331,6 +331,8 @@ static void ls3a5000_virt_init(MachineState *machine)
     MemoryRegion *bios = g_new(MemoryRegion, 1);
     ram_addr_t offset = 0;
     DeviceState *pch_pic;
+    const CPUArchIdList *possible_cpus;
+    MachineClass *mc = MACHINE_GET_CLASS(machine);
 
     if (!cpu_model) {
         cpu_model = LOONGARCH_CPU_TYPE_NAME("Loongson-3A5000");
@@ -346,15 +348,20 @@ static void ls3a5000_virt_init(MachineState *machine)
     address_space_init(lams->address_space_iocsr, lams->system_iocsr, "IOCSR");
 
     /* Init CPUs */
+    possible_cpus = mc->possible_cpu_arch_ids(machine);
     for (i = 0; i < machine->smp.cpus; i++) {
         Object *cpuobj = NULL;
         CPUState *cs;
 
-        cpuobj = object_new(machine->cpu_type);
+        cpuobj = object_new(possible_cpus->cpus[i].type);
+        object_property_set_uint(cpuobj, "id",
+                                 possible_cpus->cpus[i].arch_id, NULL);
 
         cs = CPU(cpuobj);
         cs->cpu_index = i;
 
+        machine->possible_cpus->cpus[i].cpu = cpuobj;
+
         qdev_realize(DEVICE(cpuobj), NULL, &error_fatal);
         object_unref(cpuobj);
 
@@ -497,12 +504,38 @@ static void loongarch_machine_initfn(Object *obj)
     lams->oem_table_id = g_strndup(ACPI_BUILD_APPNAME8, 8);
 }
 
+static const CPUArchIdList *loongarch_possible_cpu_arch_ids(MachineState *ms)
+{
+    int i;
+    unsigned int max_cpus = ms->smp.max_cpus;
+
+    if (ms->possible_cpus) {
+        /*
+         * make sure that max_cpus hasn't changed since the first use, i.e.
+         * -smp hasn't been parsed after it
+         */
+        assert(ms->possible_cpus->len == max_cpus);
+        return ms->possible_cpus;
+    }
+
+    ms->possible_cpus = g_malloc0(sizeof(CPUArchIdList) +
+                                  sizeof(CPUArchId) * max_cpus);
+    ms->possible_cpus->len = max_cpus;
+    for (i = 0; i < ms->possible_cpus->len; i++) {
+            ms->possible_cpus->cpus[i].type = ms->cpu_type;
+            ms->possible_cpus->cpus[i].vcpus_count = 1;
+            ms->possible_cpus->cpus[i].arch_id = i;
+    }
+    return ms->possible_cpus;
+}
+
 static void loongarch_class_init(ObjectClass *oc, void *data)
 {
     MachineClass *mc = MACHINE_CLASS(oc);
 
     mc->desc = "Loongson-5000 LS7A1000 machine";
     mc->init = ls3a5000_virt_init;
+    mc->possible_cpu_arch_ids = loongarch_possible_cpu_arch_ids;
     mc->default_ram_size = 1 * GiB;
     mc->default_cpu_type = LOONGARCH_CPU_TYPE_NAME("Loongson-3A5000");
     mc->default_ram_id = "loongarch.ram";
-- 
2.27.0