[RFC 37/41] hw/i386: Allow i386 to create new CPUs from QOM topology

[Zhao Liu <zhao1.liu@xxxxxxxxxxxxxxx>]

From: Zhao Liu <zhao1.liu@xxxxxxxxx>

For QOM topology, maximum number of CPUs and the number of plugged CPUs
are configured in core level.

Iterate through all the cpu-cores to determine how many CPUs should be
created in each cpu-core.

Signed-off-by: Zhao Liu <zhao1.liu@xxxxxxxxx>
---
 hw/i386/x86.c | 32 +++++++++++++++++++++++++++++---
 1 file changed, 29 insertions(+), 3 deletions(-)

diff --git a/hw/i386/x86.c b/hw/i386/x86.c
index 3c99f4c3ab51..febffed92a83 100644
--- a/hw/i386/x86.c
+++ b/hw/i386/x86.c
@@ -152,9 +152,35 @@ void x86_cpus_init(X86MachineState *x86ms, int default_cpu_version)
     }
 
     possible_cpus = mc->possible_cpu_arch_ids(ms);
-    for (i = 0; i < ms->smp.cpus; i++) {
-        x86_cpu_new(x86ms, possible_cpus->cpus[i].arch_id,
-                    NULL, i, &error_fatal);
+
+    /*
+     * possible_cpus_qom_granu means the QOM topology support.
+     *
+     * TODO: Drop the "!mc->smp_props.possible_cpus_qom_granu" case when
+     * i386 completes QOM topology support.
+     */
+    if (mc->smp_props.possible_cpus_qom_granu) {
+        CPUCore *core;
+        int cpu_index = 0;
+        int core_idx = 0;
+
+        MACHINE_CORE_FOREACH(ms, core) {
+            for (i = 0; i < core->plugged_threads; i++) {
+                x86_cpu_new(x86ms, possible_cpus->cpus[cpu_index].arch_id,
+                            OBJECT(core), cpu_index, &error_fatal);
+                cpu_index++;
+            }
+
+            if (core->plugged_threads < core->nr_threads) {
+                cpu_index += core->nr_threads - core->plugged_threads;
+            }
+            core_idx++;
+        }
+    } else {
+        for (i = 0; i < ms->smp.cpus; i++) {
+            x86_cpu_new(x86ms, possible_cpus->cpus[i].arch_id,
+                        NULL, i, &error_fatal);
+        }
     }
 }
 
-- 
2.34.1