Re: [PATCH 05/22] exec/cpu: Call qemu_init_vcpu() once in cpu_common_realize()

[Igor Mammedov <imammedo@redhat.com>]

On Mon, 18 Sep 2023 18:02:38 +0200
Philippe Mathieu-Daudé <philmd@linaro.org> wrote:

> qemu_init_vcpu() is called in each ${target}_cpu_realize() before
> the call to parent_realize(), which is cpu_common_realizefn().
> Call it once there.
> 
> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
> ---
>  hw/core/cpu-common.c    | 3 +++
>  target/alpha/cpu.c      | 2 --
>  target/arm/cpu.c        | 2 --
>  target/avr/cpu.c        | 1 -
>  target/cris/cpu.c       | 2 --
>  target/hexagon/cpu.c    | 1 -
>  target/hppa/cpu.c       | 1 -
>  target/i386/cpu.c       | 4 +---
>  target/loongarch/cpu.c  | 2 --
>  target/m68k/cpu.c       | 2 --
>  target/microblaze/cpu.c | 2 --
>  target/mips/cpu.c       | 2 --
>  target/nios2/cpu.c      | 1 -
>  target/openrisc/cpu.c   | 2 --
>  target/ppc/cpu_init.c   | 1 -
>  target/riscv/cpu.c      | 2 --
>  target/rx/cpu.c         | 2 --
>  target/s390x/cpu.c      | 1 -
>  target/sh4/cpu.c        | 2 --
>  target/sparc/cpu.c      | 2 --
>  target/tricore/cpu.c    | 1 -
>  target/xtensa/cpu.c     | 2 --
>  22 files changed, 4 insertions(+), 36 deletions(-)
> 
> diff --git a/hw/core/cpu-common.c b/hw/core/cpu-common.c
> index ced66c2b34..a3b8de7054 100644
> --- a/hw/core/cpu-common.c
> +++ b/hw/core/cpu-common.c
> @@ -204,6 +204,9 @@ static void cpu_common_realizefn(DeviceState *dev, Error **errp)
>          }
>      }
>  
> +    /* Create CPU address space and vCPU thread */
> +    qemu_init_vcpu(cpu);
> +
>      if (dev->hotplugged) {
>          cpu_synchronize_post_init(cpu);
>          cpu_resume(cpu);
> diff --git a/target/alpha/cpu.c b/target/alpha/cpu.c
> index 270ae787b1..eb78318bb8 100644
> --- a/target/alpha/cpu.c
> +++ b/target/alpha/cpu.c
> @@ -82,8 +82,6 @@ static void alpha_cpu_realizefn(DeviceState *dev, Error **errp)
>          return;
>      }
>  
> -    qemu_init_vcpu(cs);
> -
>      acc->parent_realize(dev, errp);
>  }
>  
> diff --git a/target/arm/cpu.c b/target/arm/cpu.c
> index 6aca036b85..fc3772025c 100644
> --- a/target/arm/cpu.c
> +++ b/target/arm/cpu.c
> @@ -2277,8 +2277,6 @@ static void arm_cpu_realizefn(DeviceState *dev, Error **errp)
>          }
>      }
>  
> -    qemu_init_vcpu(cs);
> -
>      acc->parent_realize(dev, errp);
>      cpu_reset(cs);
>  }
> diff --git a/target/avr/cpu.c b/target/avr/cpu.c
> index 84d353f30e..d3460b3960 100644
> --- a/target/avr/cpu.c
> +++ b/target/avr/cpu.c
> @@ -119,7 +119,6 @@ static void avr_cpu_realizefn(DeviceState *dev, Error **errp)
>          error_propagate(errp, local_err);
>          return;
>      }
> -    qemu_init_vcpu(cs);
>  
>      mcc->parent_realize(dev, errp);
>      cpu_reset(cs);
> diff --git a/target/cris/cpu.c b/target/cris/cpu.c
> index 079872a5cc..671693a362 100644
> --- a/target/cris/cpu.c
> +++ b/target/cris/cpu.c
> @@ -152,8 +152,6 @@ static void cris_cpu_realizefn(DeviceState *dev, Error **errp)
>          return;
>      }
>  
> -    qemu_init_vcpu(cs);
> -
>      ccc->parent_realize(dev, errp);
>      cpu_reset(cs);
>  }
> diff --git a/target/hexagon/cpu.c b/target/hexagon/cpu.c
> index 7edc32701f..5b9bb3fe83 100644
> --- a/target/hexagon/cpu.c
> +++ b/target/hexagon/cpu.c
> @@ -345,7 +345,6 @@ static void hexagon_cpu_realize(DeviceState *dev, Error **errp)
>                               NUM_VREGS + NUM_QREGS,
>                               "hexagon-hvx.xml", 0);
>  
> -    qemu_init_vcpu(cs);
>      mcc->parent_realize(dev, errp);
>      cpu_reset(cs);
>  }
> diff --git a/target/hppa/cpu.c b/target/hppa/cpu.c
> index 11022f9c99..49082bd2ba 100644
> --- a/target/hppa/cpu.c
> +++ b/target/hppa/cpu.c
> @@ -131,7 +131,6 @@ static void hppa_cpu_realizefn(DeviceState *dev, Error **errp)
>          return;
>      }
>  
> -    qemu_init_vcpu(cs);
>      acc->parent_realize(dev, errp);
>  
>  #ifndef CONFIG_USER_ONLY
> diff --git a/target/i386/cpu.c b/target/i386/cpu.c
> index 7faaa6915f..cb41d30aab 100644
> --- a/target/i386/cpu.c
> +++ b/target/i386/cpu.c
> @@ -7425,15 +7425,13 @@ static void x86_cpu_realizefn(DeviceState *dev, Error **errp)
>  
>      mce_init(cpu);
>  
> -    qemu_init_vcpu(cs);
> -
>      /*
>       * Most Intel and certain AMD CPUs support hyperthreading. Even though QEMU
>       * fixes this issue by adjusting CPUID_0000_0001_EBX and CPUID_8000_0008_ECX
>       * based on inputs (sockets,cores,threads), it is still better to give
>       * users a warning.
>       *
> -     * NOTE: the following code has to follow qemu_init_vcpu(). Otherwise
> +     * NOTE: the following code has to follow cpu_common_realize(). Otherwise

Does moving qemu_init_vcpu() past check and altering comment here
makes cs->nr_threads somehow correct for following if()?

>       * cs->nr_threads hasn't be populated yet and the checking is incorrect.
>       */
>      if (IS_AMD_CPU(env) &&

missing context:
       if (IS_AMD_CPU(env) &&
           !(env->features[FEAT_8000_0001_ECX] & CPUID_EXT3_TOPOEXT) &&
           cs->nr_threads > 1 && !ht_warned) {

> diff --git a/target/loongarch/cpu.c b/target/loongarch/cpu.c
> index 8029e70e76..dc0ac39833 100644
> --- a/target/loongarch/cpu.c
> +++ b/target/loongarch/cpu.c
> @@ -565,8 +565,6 @@ static void loongarch_cpu_realizefn(DeviceState *dev, Error **errp)
>  
>      loongarch_cpu_register_gdb_regs_for_features(cs);
>  
> -    qemu_init_vcpu(cs);
> -
>      lacc->parent_realize(dev, errp);
>      cpu_reset(cs);
>  }
> diff --git a/target/m68k/cpu.c b/target/m68k/cpu.c
> index 2bc0a62f0e..3da316bc30 100644
> --- a/target/m68k/cpu.c
> +++ b/target/m68k/cpu.c
> @@ -321,8 +321,6 @@ static void m68k_cpu_realizefn(DeviceState *dev, Error **errp)
>  
>      m68k_cpu_init_gdb(cpu);
>  
> -    qemu_init_vcpu(cs);
> -
>      mcc->parent_realize(dev, errp);
>      cpu_reset(cs);
>  }
> diff --git a/target/microblaze/cpu.c b/target/microblaze/cpu.c
> index 03c2c4db1f..1f19a6e07d 100644
> --- a/target/microblaze/cpu.c
> +++ b/target/microblaze/cpu.c
> @@ -221,8 +221,6 @@ static void mb_cpu_realizefn(DeviceState *dev, Error **errp)
>          return;
>      }
>  
> -    qemu_init_vcpu(cs);
> -
>      version = cpu->cfg.version ? cpu->cfg.version : DEFAULT_CPU_VERSION;
>      for (i = 0; mb_cpu_lookup[i].name && version; i++) {
>          if (strcmp(mb_cpu_lookup[i].name, version) == 0) {
> diff --git a/target/mips/cpu.c b/target/mips/cpu.c
> index 8d6f633f72..0aea69aaf9 100644
> --- a/target/mips/cpu.c
> +++ b/target/mips/cpu.c
> @@ -492,8 +492,6 @@ static void mips_cpu_realizefn(DeviceState *dev, Error **errp)
>      fpu_init(env, env->cpu_model);
>      mvp_init(env);
>  
> -    qemu_init_vcpu(cs);
> -
>      mcc->parent_realize(dev, errp);
>      cpu_reset(cs);
>  }
> diff --git a/target/nios2/cpu.c b/target/nios2/cpu.c
> index 876a6dcad2..7a92fc5f2c 100644
> --- a/target/nios2/cpu.c
> +++ b/target/nios2/cpu.c
> @@ -216,7 +216,6 @@ static void nios2_cpu_realizefn(DeviceState *dev, Error **errp)
>      }
>  
>      realize_cr_status(cs);
> -    qemu_init_vcpu(cs);
>  
>      /* We have reserved storage for cpuid; might as well use it. */
>      cpu->env.ctrl[CR_CPUID] = cs->cpu_index;
> diff --git a/target/openrisc/cpu.c b/target/openrisc/cpu.c
> index cd25f1e9d5..e4ec95ca7f 100644
> --- a/target/openrisc/cpu.c
> +++ b/target/openrisc/cpu.c
> @@ -141,8 +141,6 @@ static void openrisc_cpu_realizefn(DeviceState *dev, Error **errp)
>          return;
>      }
>  
> -    qemu_init_vcpu(cs);
> -
>      occ->parent_realize(dev, errp);
>      cpu_reset(cs);
>  }
> diff --git a/target/ppc/cpu_init.c b/target/ppc/cpu_init.c
> index 7ab5ee92d9..e2c06c1f32 100644
> --- a/target/ppc/cpu_init.c
> +++ b/target/ppc/cpu_init.c
> @@ -6833,7 +6833,6 @@ static void ppc_cpu_realize(DeviceState *dev, Error **errp)
>      init_ppc_proc(cpu);
>  
>      ppc_gdb_init(cs, pcc);
> -    qemu_init_vcpu(cs);
>  
>      pcc->parent_realize(dev, errp);
>  
> diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
> index 7566757346..4f7ae55359 100644
> --- a/target/riscv/cpu.c
> +++ b/target/riscv/cpu.c
> @@ -1531,8 +1531,6 @@ static void riscv_cpu_realize(DeviceState *dev, Error **errp)
>      }
>  #endif
>  
> -    qemu_init_vcpu(cs);
> -
>      mcc->parent_realize(dev, errp);
>      cpu_reset(cs);
>  }
> diff --git a/target/rx/cpu.c b/target/rx/cpu.c
> index c9c8443cbd..089df61790 100644
> --- a/target/rx/cpu.c
> +++ b/target/rx/cpu.c
> @@ -137,8 +137,6 @@ static void rx_cpu_realize(DeviceState *dev, Error **errp)
>          return;
>      }
>  
> -    qemu_init_vcpu(cs);
> -
>      rcc->parent_realize(dev, errp);
>      cpu_reset(cs);
>  }
> diff --git a/target/s390x/cpu.c b/target/s390x/cpu.c
> index 0f0b11fd73..416ac6c4e0 100644
> --- a/target/s390x/cpu.c
> +++ b/target/s390x/cpu.c
> @@ -252,7 +252,6 @@ static void s390_cpu_realizefn(DeviceState *dev, Error **errp)
>      qemu_register_reset(s390_cpu_machine_reset_cb, S390_CPU(dev));
>  #endif
>      s390_cpu_gdb_init(cs);
> -    qemu_init_vcpu(cs);
>  
>      scc->parent_realize(dev, &err);
>      /*
> diff --git a/target/sh4/cpu.c b/target/sh4/cpu.c
> index 656d71f74a..e6690daf9a 100644
> --- a/target/sh4/cpu.c
> +++ b/target/sh4/cpu.c
> @@ -228,8 +228,6 @@ static void superh_cpu_realizefn(DeviceState *dev, Error **errp)
>          return;
>      }
>  
> -    qemu_init_vcpu(cs);
> -
>      scc->parent_realize(dev, errp);
>      cpu_reset(cs);
>  }
> diff --git a/target/sparc/cpu.c b/target/sparc/cpu.c
> index 130ab8f578..2fdc95eda9 100644
> --- a/target/sparc/cpu.c
> +++ b/target/sparc/cpu.c
> @@ -782,8 +782,6 @@ static void sparc_cpu_realizefn(DeviceState *dev, Error **errp)
>          return;
>      }
>  
> -    qemu_init_vcpu(cs);
> -
>      scc->parent_realize(dev, errp);
>  }
>  
> diff --git a/target/tricore/cpu.c b/target/tricore/cpu.c
> index a3610aecca..0142cf556d 100644
> --- a/target/tricore/cpu.c
> +++ b/target/tricore/cpu.c
> @@ -118,7 +118,6 @@ static void tricore_cpu_realizefn(DeviceState *dev, Error **errp)
>      if (tricore_has_feature(env, TRICORE_FEATURE_131)) {
>          set_feature(env, TRICORE_FEATURE_13);
>      }
> -    qemu_init_vcpu(cs);
>  
>      tcc->parent_realize(dev, errp);
>      cpu_reset(cs);
> diff --git a/target/xtensa/cpu.c b/target/xtensa/cpu.c
> index acaf8c905f..300d19d45c 100644
> --- a/target/xtensa/cpu.c
> +++ b/target/xtensa/cpu.c
> @@ -174,8 +174,6 @@ 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);
>  }
>