[Qemu-devel] [PATCH 07/16] cpu: introduce get_arch_id() method and override it for target-i386

[Igor Mammedov <imammedo@redhat.com>]

get_arch_id() adds possibility for generic code to get guest visible
CPU ID without accessing CPUArchState. If target doesn't override it,
it will return cpu_index.

Override it on target-i386 to return APIC ID.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
---
 * it will be used later by new cpu_exists() generic function and
   acpi_piix.
 * s/cpu_firmware_id/cpu_arch_id/
---
 include/qom/cpu.h |  2 ++
 qom/cpu.c         |  6 ++++++
 target-i386/cpu.c | 10 ++++++++++
 3 files changed, 18 insertions(+)

diff --git a/include/qom/cpu.h b/include/qom/cpu.h
index 6ce6f10..428aaf0 100644
--- a/include/qom/cpu.h
+++ b/include/qom/cpu.h
@@ -45,6 +45,7 @@ typedef struct CPUState CPUState;
  * instantiatable CPU type.
  * @reset: Callback to reset the #CPUState to its initial state.
  * @do_interrupt: Callback for interrupt handling.
+ * @get_arch_id: Callback for getting architecture depended CPU ID
  * @vmsd: State description for migration.
  *
  * Represents a CPU family or model.
@@ -58,6 +59,7 @@ typedef struct CPUClass {
 
     void (*reset)(CPUState *cpu);
     void (*do_interrupt)(CPUState *cpu);
+    int64_t (*get_arch_id)(CPUState *cpu);
 
     const struct VMStateDescription *vmsd;
 } CPUClass;
diff --git a/qom/cpu.c b/qom/cpu.c
index 819986e..a13ddda 100644
--- a/qom/cpu.c
+++ b/qom/cpu.c
@@ -76,6 +76,11 @@ static void cpu_common_realizefn(DeviceState *dev, Error **errp)
     }
 }
 
+static int64_t cpu_common_get_arch_id(CPUState *cpu)
+{
+    return cpu->cpu_index;
+}
+
 static void cpu_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
@@ -83,6 +88,7 @@ static void cpu_class_init(ObjectClass *klass, void *data)
 
     k->class_by_name = cpu_common_class_by_name;
     k->reset = cpu_common_reset;
+    k->get_arch_id = cpu_common_get_arch_id;
     dc->realize = cpu_common_realizefn;
     dc->no_user = 1;
 }
diff --git a/target-i386/cpu.c b/target-i386/cpu.c
index e2302d8..a415fa3 100644
--- a/target-i386/cpu.c
+++ b/target-i386/cpu.c
@@ -2272,6 +2272,14 @@ static void x86_cpu_initfn(Object *obj)
     }
 }
 
+static int64_t x86_cpu_get_arch_id(CPUState *cpu)
+{
+    X86CPU *x86cpu = X86_CPU(cpu);
+    CPUX86State *env = &x86cpu->env;
+
+    return env->cpuid_apic_id;
+}
+
 static void x86_cpu_common_class_init(ObjectClass *oc, void *data)
 {
     X86CPUClass *xcc = X86_CPU_CLASS(oc);
@@ -2286,6 +2294,8 @@ static void x86_cpu_common_class_init(ObjectClass *oc, void *data)
 
     cc->do_interrupt = x86_cpu_do_interrupt;
     cpu_class_set_vmsd(cc, &vmstate_x86_cpu);
+
+    cc->get_arch_id = x86_cpu_get_arch_id;
 }
 
 static const TypeInfo x86_cpu_type_info = {
-- 
1.8.2