[Qemu-devel] [PATCH v3 1/7] x86: add x86_cpu_unrealizefn() for cpu apic remove

[Zhu Guihua]

From: Chen Fan <address@hidden>

Implement x86_cpu_unrealizefn() for corresponding x86_cpu_realizefn(),
which is mostly used to clean the apic related allocation and vmstates
at here.

Signed-off-by: Chen Fan <address@hidden>
Signed-off-by: Gu Zheng <address@hidden>
Signed-off-by: Zhu Guihua <address@hidden>
---
 hw/i386/kvm/apic.c              |  5 +++++
 hw/intc/apic.c                  |  9 ++++++++
 hw/intc/apic_common.c           | 21 ++++++++++++-------
 include/hw/i386/apic_internal.h |  1 +
 target-i386/cpu.c               | 46 +++++++++++++++++++++++++++++++++++++++++
 5 files changed, 74 insertions(+), 8 deletions(-)

diff --git a/hw/i386/kvm/apic.c b/hw/i386/kvm/apic.c
index 4b7ce57..45abfe9 100644
--- a/hw/i386/kvm/apic.c
+++ b/hw/i386/kvm/apic.c
@@ -195,11 +195,16 @@ static void kvm_apic_realize(DeviceState *dev, Error 
**errp)
     }
 }
 
+static void kvm_apic_unrealize(DeviceState *dev, Error **errp)
+{
+}
+
 static void kvm_apic_class_init(ObjectClass *klass, void *data)
 {
     APICCommonClass *k = APIC_COMMON_CLASS(klass);
 
     k->realize = kvm_apic_realize;
+    k->unrealize = kvm_apic_unrealize;
     k->reset = kvm_apic_reset;
     k->set_base = kvm_apic_set_base;
     k->set_tpr = kvm_apic_set_tpr;
diff --git a/hw/intc/apic.c b/hw/intc/apic.c
index e48974f..f260cdf 100644
--- a/hw/intc/apic.c
+++ b/hw/intc/apic.c
@@ -895,11 +895,20 @@ static void apic_realize(DeviceState *dev, Error **errp)
     msi_supported = true;
 }
 
+static void apic_unrealize(DeviceState *dev, Error **errp)
+{
+    APICCommonState *s = APIC_COMMON(dev);
+
+    timer_free(s->timer);
+    local_apics[s->idx] = NULL;
+}
+
 static void apic_class_init(ObjectClass *klass, void *data)
 {
     APICCommonClass *k = APIC_COMMON_CLASS(klass);
 
     k->realize = apic_realize;
+    k->unrealize = apic_unrealize;
     k->set_base = apic_set_base;
     k->set_tpr = apic_set_tpr;
     k->get_tpr = apic_get_tpr;
diff --git a/hw/intc/apic_common.c b/hw/intc/apic_common.c
index 52b933d..657ffa0 100644
--- a/hw/intc/apic_common.c
+++ b/hw/intc/apic_common.c
@@ -302,17 +302,9 @@ static void apic_common_realize(DeviceState *dev, Error 
**errp)
     APICCommonState *s = APIC_COMMON(dev);
     APICCommonClass *info;
     static DeviceState *vapic;
-    static int apic_no;
     PCMachineState *pcms = PC_MACHINE(qdev_get_machine());
     static bool mmio_registered;
 
-    if (apic_no >= MAX_APICS) {
-        error_setg(errp, "%s initialization failed.",
-                   object_get_typename(OBJECT(dev)));
-        return;
-    }
-    s->idx = apic_no++;
-
     info = APIC_COMMON_GET_CLASS(s);
     info->realize(dev, errp);
 
@@ -335,6 +327,18 @@ static void apic_common_realize(DeviceState *dev, Error 
**errp)
 
 }
 
+static void apic_common_unrealize(DeviceState *dev, Error **errp)
+{
+    APICCommonState *s = APIC_COMMON(dev);
+    APICCommonClass *info = APIC_COMMON_GET_CLASS(s);
+
+    info->unrealize(dev, errp);
+
+    if (apic_report_tpr_access && info->enable_tpr_reporting) {
+        info->enable_tpr_reporting(s, false);
+    }
+}
+
 static int apic_pre_load(void *opaque)
 {
     APICCommonState *s = APIC_COMMON(opaque);
@@ -442,6 +446,7 @@ static void apic_common_class_init(ObjectClass *klass, void 
*data)
     dc->reset = apic_reset_common;
     dc->props = apic_properties_common;
     dc->realize = apic_common_realize;
+    dc->unrealize = apic_common_unrealize;
     /*
      * Reason: APIC and CPU need to be wired up by
      * x86_cpu_apic_create()
diff --git a/include/hw/i386/apic_internal.h b/include/hw/i386/apic_internal.h
index 578a616..3432a78 100644
--- a/include/hw/i386/apic_internal.h
+++ b/include/hw/i386/apic_internal.h
@@ -81,6 +81,7 @@ typedef struct APICCommonClass
     DeviceClass parent_class;
 
     DeviceRealize realize;
+    DeviceUnrealize unrealize;
     void (*set_base)(APICCommonState *s, uint64_t val);
     void (*set_tpr)(APICCommonState *s, uint8_t val);
     uint8_t (*get_tpr)(APICCommonState *s);
diff --git a/target-i386/cpu.c b/target-i386/cpu.c
index fc0e4a6..84c88fe 100644
--- a/target-i386/cpu.c
+++ b/target-i386/cpu.c
@@ -2775,6 +2775,8 @@ static void x86_cpu_apic_create(X86CPU *cpu, Error **errp)
 
     /* TODO: convert to link<> */
     apic = APIC_COMMON(cpu->apic_state);
+    g_assert(apic_id < MAX_APICS);
+    apic->idx = apic_id;
     apic->cpu = cpu;
 }
 
@@ -2798,10 +2800,32 @@ static void x86_cpu_apic_realize(X86CPU *cpu, Error 
**errp)
         return;
     }
 }
+
+static void x86_cpu_apic_unrealize(X86CPU *cpu, Error **errp)
+{
+    Error *local_err = NULL;
+
+    if (cpu->apic_state == NULL) {
+        return;
+    }
+
+    object_property_set_bool(OBJECT(cpu->apic_state),
+                             false, "realized", &local_err);
+    if (local_err != NULL) {
+        error_propagate(errp, local_err);
+        return;
+    }
+
+    vmstate_unregister(NULL, &vmstate_apic_common, cpu->apic_state);
+    object_unparent(OBJECT(cpu->apic_state));
+}
 #else
 static void x86_cpu_apic_realize(X86CPU *cpu, Error **errp)
 {
 }
+static void x86_cpu_apic_unrealize(X86CPU *cpu, Error **errp)
+{
+}
 #endif
 
 
@@ -2884,6 +2908,27 @@ out:
     }
 }
 
+static void x86_cpu_unrealizefn(DeviceState *dev, Error **errp)
+{
+    X86CPU *cpu = X86_CPU(dev);
+    CPUClass *cc = CPU_GET_CLASS(dev);
+    Error *local_err = NULL;
+
+    if (qdev_get_vmsd(DEVICE(cpu)) == NULL) {
+        vmstate_unregister(NULL, &vmstate_cpu_common, cpu);
+    }
+
+    if (cc->vmsd != NULL) {
+        vmstate_unregister(NULL, cc->vmsd, cpu);
+    }
+
+    x86_cpu_apic_unrealize(cpu, &local_err);
+    if (local_err != NULL) {
+        error_propagate(errp, local_err);
+        return;
+    }
+}
+
 /* Enables contiguous-apic-ID mode, for compatibility */
 static bool compat_apic_id_mode;
 
@@ -3059,6 +3104,7 @@ static void x86_cpu_common_class_init(ObjectClass *oc, 
void *data)
 
     xcc->parent_realize = dc->realize;
     dc->realize = x86_cpu_realizefn;
+    dc->unrealize = x86_cpu_unrealizefn;
     dc->props = x86_cpu_properties;
 
     xcc->parent_reset = cc->reset;
-- 
1.9.3