target-i386: Defer MCE init

Commit de024815e3b523addf58f1f79846b7fe74643678 (target-i386: QOM'ify
CPU init) moved mce_init() call from helper.c:cpu_x86_init() into
X86CPU's cpu.c:x86_cpu_initfn().
mce_init() checks for a family >= 6 though, so we could end up with a
sequence such as for -cpu somecpu,family=6:

  x86_cpu_initfn => X86CPU::family == 5
    mce_init => no-op
  cpu_x86_register => X86CPU::family = 6
  => MCE unexpectedly not init'ed

or for -cpu someothercpu,family=5:

  x86_cpu_initfn => X86CPU::family == 6
    mce_init => init'ed
  cpu_x86_register => X86CPU::family = 5
  => MCE unexpectedly init'ed

Therefore partially revert the above commit. To avoid moving
mce_init() back into helper.c, foresightedly move it into a
new x86_cpu_realize() function and, in lack of ObjectClass::realize,
call it directly from cpu_x86_init().

While at it, move the qemu_init_vcpu() call that used to follow
mce_init() in cpu_x86_init() into the new realizefn as well.

Reported-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>

1 files changed, 8 insertions, 1 deletions

diff --git a/target-i386/cpu.c b/target-i386/cpu.c
index 65d9af6..89b4ac7 100644
--- a/target-i386/cpu.c
+++ b/target-i386/cpu.c
@@ -1722,6 +1722,14 @@ static void mce_init(X86CPU *cpu)
     }
 }
 
+void x86_cpu_realize(Object *obj, Error **errp)
+{
+    X86CPU *cpu = X86_CPU(obj);
+
+    mce_init(cpu);
+    qemu_init_vcpu(&cpu->env);
+}
+
 static void x86_cpu_initfn(Object *obj)
 {
     X86CPU *cpu = X86_CPU(obj);
@@ -1755,7 +1763,6 @@ static void x86_cpu_initfn(Object *obj)
                         x86_cpuid_set_tsc_freq, NULL, NULL, NULL);
 
     env->cpuid_apic_id = env->cpu_index;
-    mce_init(cpu);
 }
 
 static void x86_cpu_common_class_init(ObjectClass *oc, void *data)