[Qemu-devel] [PATCH for-1.1] target-i386: Defer MCE init

["Andreas Färber" <afaerber@suse.de>]

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>
Cc: Anthony Liguori <anthony@codemonkey.ws>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Michael Roth <mdroth@linux.vnet.ibm.com>
---
 target-i386/cpu-qom.h |    4 ++++
 target-i386/cpu.c     |    9 ++++++++-
 target-i386/helper.c  |    2 +-
 3 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/target-i386/cpu-qom.h b/target-i386/cpu-qom.h
index 40635c4..5901140 100644
--- a/target-i386/cpu-qom.h
+++ b/target-i386/cpu-qom.h
@@ -22,6 +22,7 @@
 
 #include "qemu/cpu.h"
 #include "cpu.h"
+#include "error.h"
 
 #ifdef TARGET_X86_64
 #define TYPE_X86_CPU "x86_64-cpu"
@@ -71,5 +72,8 @@ static inline X86CPU *x86_env_get_cpu(CPUX86State *env)
 
 #define ENV_GET_CPU(e) CPU(x86_env_get_cpu(e))
 
+/* TODO Drop once ObjectClass::realize is available */
+void x86_cpu_realize(Object *obj, Error **errp);
+
 
 #endif
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)
diff --git a/target-i386/helper.c b/target-i386/helper.c
index 0b22582..3421be2 100644
--- a/target-i386/helper.c
+++ b/target-i386/helper.c
@@ -1181,7 +1181,7 @@ CPUX86State *cpu_x86_init(const char *cpu_model)
         return NULL;
     }
 
-    qemu_init_vcpu(env);
+    x86_cpu_realize(OBJECT(cpu), NULL);
 
     return env;
 }
-- 
1.7.7