[Qemu-devel] [PATCH 21/22] target-i386: expose all possible CPUs as /machine/icc-bridge/cpu[0..N] links

[Igor Mammedov <imammedo@redhat.com>]

... and leave links for not present CPUs empty

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
---
 hw/i386/pc.c |  9 +++++++--
 hw/icc_bus.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 hw/icc_bus.h |  2 ++
 3 files changed, 55 insertions(+), 2 deletions(-)

diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index 6f043a2..86e5365 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -870,7 +870,8 @@ void pc_acpi_smi_interrupt(void *opaque, int irq, int level)
     }
 }
 
-static X86CPU *pc_new_cpu(const char *cpu_model, int64_t apic_id, Error **errp)
+static X86CPU *pc_new_cpu(const char *cpu_model, int64_t apic_id,
+                          SysBusDevice *icc_bridge, Error **errp)
 {
     X86CPU *cpu;
 
@@ -882,6 +883,10 @@ static X86CPU *pc_new_cpu(const char *cpu_model, int64_t apic_id, Error **errp)
     object_property_set_int(OBJECT(cpu), apic_id, "apic-id", errp);
     object_property_set_bool(OBJECT(cpu), true, "realized", errp);
 
+    if (icc_bridge != NULL) {
+        icc_bridge_set_cpu_link(OBJECT(icc_bridge), OBJECT(cpu));
+    }
+
     if (error_is_set(errp)) {
         if (cpu != NULL) {
             object_unref(OBJECT(cpu));
@@ -911,7 +916,7 @@ void pc_cpus_init(const char *cpu_model)
                                                  TYPE_ICC_BRIDGE, NULL));
 
     for (i = 0; i < smp_cpus; i++) {
-        cpu = pc_new_cpu(cpu_model, x86_cpu_apic_id_from_index(i), &error);
+        cpu = pc_new_cpu(cpu_model, x86_cpu_apic_id_from_index(i), ib, &error);
         if (error) {
             fprintf(stderr, "%s\n", error_get_pretty(error));
             error_free(error);
diff --git a/hw/icc_bus.c b/hw/icc_bus.c
index fdf9504..fd4b237 100644
--- a/hw/icc_bus.c
+++ b/hw/icc_bus.c
@@ -18,6 +18,7 @@
  */
 #include "icc_bus.h"
 #include "sysbus.h"
+#include "sysemu/sysemu.h"
 
 static void icc_bus_initfn(Object *obj)
 {
@@ -61,6 +62,8 @@ typedef struct ICCBridgeState {
     SysBusDevice busdev;
     MemoryRegion apic_container;
     MemoryRegion ioapic_container;
+    Notifier cpu_add_notifier;
+    Object **links;
 } ICCBridgeState;
 #define ICC_BRIGDE(obj) OBJECT_CHECK(ICCBridgeState, (obj), TYPE_ICC_BRIDGE)
 
@@ -77,11 +80,33 @@ static void icc_bridge_prop_set_ioapic_type(Object *obj, const char *value,
     }
 }
 
+void icc_bridge_set_cpu_link(Object *bridge, Object *cpu_obj)
+{
+    gchar *name;
+    Error *error = NULL;
+    CPUState *cpu = CPU(cpu_obj);
+    int64_t id = CPU_GET_CLASS(cpu)->get_firmware_id(cpu);
+
+    name = g_strdup_printf("cpu[%" PRIu32 "]", x86_cpu_apic_id_from_index(id));
+    object_property_set_link(bridge, cpu_obj, name, &error);
+    g_free(name);
+
+    g_assert(error == NULL);
+}
+
+static void icc_bridge_cpu_add_req(Notifier *n, void *opaque)
+{
+    ICCBridgeState *s = container_of(n, ICCBridgeState, cpu_add_notifier);
+
+    icc_bridge_set_cpu_link(OBJECT(s), OBJECT(opaque));
+}
+
 static void icc_bridge_initfn(Object *obj)
 {
     ICCBridgeState *s = ICC_BRIGDE(obj);
     SysBusDevice *sb = SYS_BUS_DEVICE(obj);
     ICCBus *ibus;
+    int i;
 
     object_property_add_str(obj, "ioapic-type",
                              NULL,
@@ -102,12 +127,33 @@ static void icc_bridge_initfn(Object *obj)
     memory_region_init(&s->ioapic_container, "icc-ioapic-container", 0x1000);
     sysbus_init_mmio(sb, &s->ioapic_container);
     ibus->ioapic_address_space = &s->ioapic_container;
+
+    s->links = g_malloc0(sizeof(Object *) * max_cpus);
+    for (i = 0; i < max_cpus; i++) {
+        gchar *cpu_name;
+
+        cpu_name = g_strdup_printf("cpu[%" PRIu32 "]",
+                                   x86_cpu_apic_id_from_index(i));
+        object_property_add_link(obj, cpu_name, TYPE_CPU, &s->links[i], NULL);
+        g_free(cpu_name);
+    }
+
+    s->cpu_add_notifier.notify = icc_bridge_cpu_add_req;
+    qemu_register_cpu_added_notifier(&s->cpu_add_notifier);
+}
+
+static void icc_bridge_fini(Object *obj)
+{
+    ICCBridgeState *s = ICC_BRIGDE(obj);
+
+    g_free(s->links);
 }
 
 static const TypeInfo icc_bridge_info = {
     .name  = "icc-bridge",
     .parent = TYPE_SYS_BUS_DEVICE,
     .instance_init  = icc_bridge_initfn,
+    .instance_finalize  = icc_bridge_fini,
     .instance_size  = sizeof(ICCBridgeState),
 };
 
diff --git a/hw/icc_bus.h b/hw/icc_bus.h
index 69a0278..bc31cd9 100644
--- a/hw/icc_bus.h
+++ b/hw/icc_bus.h
@@ -49,5 +49,7 @@ typedef struct ICCDeviceClass {
 
 #define TYPE_ICC_BRIDGE "icc-bridge"
 
+void icc_bridge_set_cpu_link(Object *bridge, Object *cpu);
+
 #endif /* CONFIG_USER_ONLY */
 #endif
-- 
1.8.1.4