cpu: Partially revert "cpu: Change qemu_init_vcpu() argument to CPUState"

Commit c643bed99 moved qemu_init_vcpu() calls to common CPUState code.
This causes x86 cpu-add to fail with "KVM: setting VAPIC address failed".

The reason for the failure is that CPUClass::kvm_fd is not yet
initialized in the following call graph:
->x86_cpu_realizefn
 ->x86_cpu_apic_realize
  ->qdev_init
   ->device_set_realized
    ->device_reset (hotplugged == 1)
     ->apic_reset_common
      ->vapic_base_update
       ->kvm_apic_vapic_base_update
This causes attempted KVM vCPU ioctls to fail.

By contrast, in the non-hotplug case the APIC is reset much later, when
the vCPU is already initialized.

As a quick and safe solution, move the qemu_init_vcpu() call back into
the targets' realize functions.

Reported-by: Chen Fan <chen.fan.fnst@cn.fujitsu.com>
Acked-by: Igor Mammedov <imammedo@redhat.com> (for i386)
Tested-by: Jia Liu <proljc@gmail.com> (for openrisc)
Signed-off-by: Andreas Färber <afaerber@suse.de>

qom/cpu.c

@@ -228,8 +228,6 @@ static void cpu_common_realizefn(DeviceState *dev, Error **errp)
 {
     CPUState *cpu = CPU(dev);
 
-    qemu_init_vcpu(cpu);
-
     if (dev->hotplugged) {
         cpu_synchronize_post_init(cpu);
         notifier_list_notify(&cpu_added_notifiers, dev);

target-alpha/cpu.c

@@ -33,8 +33,11 @@ static void alpha_cpu_set_pc(CPUState *cs, vaddr value)
 
 static void alpha_cpu_realizefn(DeviceState *dev, Error **errp)
 {
+    CPUState *cs = CPU(dev);
     AlphaCPUClass *acc = ALPHA_CPU_GET_CLASS(dev);
 
+    qemu_init_vcpu(cs);
+
     acc->parent_realize(dev, errp);
 }
 

target-arm/cpu.c

@@ -159,6 +159,7 @@ static void arm_cpu_finalizefn(Object *obj)
 
 static void arm_cpu_realizefn(DeviceState *dev, Error **errp)
 {
+    CPUState *cs = CPU(dev);
     ARMCPU *cpu = ARM_CPU(dev);
     ARMCPUClass *acc = ARM_CPU_GET_CLASS(dev);
     CPUARMState *env = &cpu->env;
@@ -214,7 +215,8 @@ static void arm_cpu_realizefn(DeviceState *dev, Error **errp)
 
     init_cpreg_list(cpu);
 
-    cpu_reset(CPU(cpu));
+    cpu_reset(cs);
+    qemu_init_vcpu(cs);
 
     acc->parent_realize(dev, errp);
 }

target-cris/cpu.c

@@ -137,10 +137,11 @@ void cris_cpu_list(FILE *f, fprintf_function cpu_fprintf)
 
 static void cris_cpu_realizefn(DeviceState *dev, Error **errp)
 {
-    CRISCPU *cpu = CRIS_CPU(dev);
+    CPUState *cs = CPU(dev);
     CRISCPUClass *ccc = CRIS_CPU_GET_CLASS(dev);
 
-    cpu_reset(CPU(cpu));
+    cpu_reset(cs);
+    qemu_init_vcpu(cs);
 
     ccc->parent_realize(dev, errp);
 }

target-i386/cpu.c

@@ -2333,6 +2333,7 @@ static void x86_cpu_apic_realize(X86CPU *cpu, Error **errp)
 
 static void x86_cpu_realizefn(DeviceState *dev, Error **errp)
 {
+    CPUState *cs = CPU(dev);
     X86CPU *cpu = X86_CPU(dev);
     X86CPUClass *xcc = X86_CPU_GET_CLASS(dev);
     CPUX86State *env = &cpu->env;
@@ -2387,12 +2388,13 @@ static void x86_cpu_realizefn(DeviceState *dev, Error **errp)
 #endif
 
     mce_init(cpu);
+    qemu_init_vcpu(cs);
 
     x86_cpu_apic_realize(cpu, &local_err);
     if (local_err != NULL) {
         goto out;
     }
-    cpu_reset(CPU(cpu));
+    cpu_reset(cs);
 
     xcc->parent_realize(dev, &local_err);
 out:

target-lm32/cpu.c

@@ -46,10 +46,12 @@ static void lm32_cpu_reset(CPUState *s)
 
 static void lm32_cpu_realizefn(DeviceState *dev, Error **errp)
 {
-    LM32CPU *cpu = LM32_CPU(dev);
+    CPUState *cs = CPU(dev);
     LM32CPUClass *lcc = LM32_CPU_GET_CLASS(dev);
 
-    cpu_reset(CPU(cpu));
+    cpu_reset(cs);
+
+    qemu_init_vcpu(cs);
 
     lcc->parent_realize(dev, errp);
 }

target-m68k/cpu.c

@@ -143,12 +143,14 @@ static const M68kCPUInfo m68k_cpus[] = {
 
 static void m68k_cpu_realizefn(DeviceState *dev, Error **errp)
 {
+    CPUState *cs = CPU(dev);
     M68kCPU *cpu = M68K_CPU(dev);
     M68kCPUClass *mcc = M68K_CPU_GET_CLASS(dev);
 
     m68k_cpu_init_gdb(cpu);
 
-    cpu_reset(CPU(cpu));
+    cpu_reset(cs);
+    qemu_init_vcpu(cs);
 
     mcc->parent_realize(dev, errp);
 }

target-microblaze/cpu.c

@@ -90,10 +90,11 @@ static void mb_cpu_reset(CPUState *s)
 
 static void mb_cpu_realizefn(DeviceState *dev, Error **errp)
 {
-    MicroBlazeCPU *cpu = MICROBLAZE_CPU(dev);
+    CPUState *cs = CPU(dev);
     MicroBlazeCPUClass *mcc = MICROBLAZE_CPU_GET_CLASS(dev);
 
-    cpu_reset(CPU(cpu));
+    cpu_reset(cs);
+    qemu_init_vcpu(cs);
 
     mcc->parent_realize(dev, errp);
 }

target-mips/cpu.c

@@ -62,10 +62,11 @@ static void mips_cpu_reset(CPUState *s)
 
 static void mips_cpu_realizefn(DeviceState *dev, Error **errp)
 {
-    MIPSCPU *cpu = MIPS_CPU(dev);
+    CPUState *cs = CPU(dev);
     MIPSCPUClass *mcc = MIPS_CPU_GET_CLASS(dev);
 
-    cpu_reset(CPU(cpu));
+    cpu_reset(cs);
+    qemu_init_vcpu(cs);
 
     mcc->parent_realize(dev, errp);
 }

target-moxie/cpu.c

@@ -45,10 +45,11 @@ static void moxie_cpu_reset(CPUState *s)
 
 static void moxie_cpu_realizefn(DeviceState *dev, Error **errp)
 {
-    MoxieCPU *cpu = MOXIE_CPU(dev);
+    CPUState *cs = CPU(dev);
     MoxieCPUClass *mcc = MOXIE_CPU_GET_CLASS(dev);
 
-    cpu_reset(CPU(cpu));
+    qemu_init_vcpu(cs);
+    cpu_reset(cs);
 
     mcc->parent_realize(dev, errp);
 }

target-openrisc/cpu.c

@@ -66,10 +66,11 @@ static inline void set_feature(OpenRISCCPU *cpu, int feature)
 
 static void openrisc_cpu_realizefn(DeviceState *dev, Error **errp)
 {
-    OpenRISCCPU *cpu = OPENRISC_CPU(dev);
+    CPUState *cs = CPU(dev);
     OpenRISCCPUClass *occ = OPENRISC_CPU_GET_CLASS(dev);
 
-    cpu_reset(CPU(cpu));
+    qemu_init_vcpu(cs);
+    cpu_reset(cs);
 
     occ->parent_realize(dev, errp);
 }

target-ppc/translate_init.c

@@ -7861,6 +7861,8 @@ static void ppc_cpu_realizefn(DeviceState *dev, Error **errp)
                                  34, "power-spe.xml", 0);
     }
 
+    qemu_init_vcpu(cs);
+
     pcc->parent_realize(dev, errp);
 
 #if defined(PPC_DUMP_CPU)

target-s390x/cpu.c

@@ -101,10 +101,11 @@ static void s390_cpu_machine_reset_cb(void *opaque)
 
 static void s390_cpu_realizefn(DeviceState *dev, Error **errp)
 {
-    S390CPU *cpu = S390_CPU(dev);
+    CPUState *cs = CPU(dev);
     S390CPUClass *scc = S390_CPU_GET_CLASS(dev);
 
-    cpu_reset(CPU(cpu));
+    qemu_init_vcpu(cs);
+    cpu_reset(cs);
 
     scc->parent_realize(dev, errp);
 }

target-sh4/cpu.c

@@ -240,10 +240,11 @@ static const TypeInfo sh7785_type_info = {
 
 static void superh_cpu_realizefn(DeviceState *dev, Error **errp)
 {
-    SuperHCPU *cpu = SUPERH_CPU(dev);
+    CPUState *cs = CPU(dev);
     SuperHCPUClass *scc = SUPERH_CPU_GET_CLASS(dev);
 
-    cpu_reset(CPU(cpu));
+    cpu_reset(cs);
+    qemu_init_vcpu(cs);
 
     scc->parent_realize(dev, errp);
 }

target-sparc/cpu.c

@@ -743,6 +743,8 @@ static void sparc_cpu_realizefn(DeviceState *dev, Error **errp)
 {
     SPARCCPUClass *scc = SPARC_CPU_GET_CLASS(dev);
 
+    qemu_init_vcpu(CPU(dev));
+
     scc->parent_realize(dev, errp);
 }
 

target-unicore32/cpu.c

@@ -92,6 +92,8 @@ static void uc32_cpu_realizefn(DeviceState *dev, Error **errp)
 {
     UniCore32CPUClass *ucc = UNICORE32_CPU_GET_CLASS(dev);
 
+    qemu_init_vcpu(CPU(dev));
+
     ucc->parent_realize(dev, errp);
 }
 

target-xtensa/cpu.c

@@ -90,6 +90,8 @@ static void xtensa_cpu_realizefn(DeviceState *dev, Error **errp)
 
     cs->gdb_num_regs = xcc->config->gdb_regmap.num_regs;
 
+    qemu_init_vcpu(cs);
+
     xcc->parent_realize(dev, errp);
 }