Re: [Qemu-devel] [PULL 16/16] target-i386: Move KVM default-vendor hack to instance_init

[Andreas Färber]

Am 03.02.2014 17:39, schrieb Paolo Bonzini:
> From: Eduardo Habkost <address@hidden>
> 
> As we will not have a cpu_x86_find_by_name() function anymore,
> move the KVM default-vendor hack to instance_init.
> 
> Unfortunately we can't move that code to class_init because it depends
> on KVM being initialized.
> 
> Signed-off-by: Eduardo Habkost <address@hidden>
> Signed-off-by: Paolo Bonzini <address@hidden>
> ---
>  target-i386/cpu.c | 32 +++++++++++++++++++-------------
>  1 file changed, 19 insertions(+), 13 deletions(-)
> 
> diff --git a/target-i386/cpu.c b/target-i386/cpu.c
> index be54f84..0e8812a 100644
> --- a/target-i386/cpu.c
> +++ b/target-i386/cpu.c
> @@ -1601,18 +1601,6 @@ static int cpu_x86_find_by_name(X86CPU *cpu, x86_def_t 
> *x86_cpu_def,
>          def = &builtin_x86_defs[i];
>          if (strcmp(name, def->name) == 0) {
>              memcpy(x86_cpu_def, def, sizeof(*def));
> -            /* sysenter isn't supported in compatibility mode on AMD,
> -             * syscall isn't supported in compatibility mode on Intel.
> -             * Normally we advertise the actual CPU vendor, but you can
> -             * override this using the 'vendor' property if you want to use
> -             * KVM's sysenter/syscall emulation in compatibility mode and
> -             * when doing cross vendor migration
> -             */
> -            if (kvm_enabled()) {
> -                uint32_t  ebx = 0, ecx = 0, edx = 0;
> -                host_cpuid(0, 0, NULL, &ebx, &ecx, &edx);
> -                x86_cpu_vendor_words2str(x86_cpu_def->vendor, ebx, edx, ecx);
> -            }
>              return 0;
>          }
>      }
> @@ -1841,7 +1829,6 @@ static void cpu_x86_register(X86CPU *cpu, const char 
> *name, Error **errp)
>          return;
>      }
>  
> -    object_property_set_str(OBJECT(cpu), def->vendor, "vendor", errp);
>      object_property_set_int(OBJECT(cpu), def->level, "level", errp);
>      object_property_set_int(OBJECT(cpu), def->family, "family", errp);
>      object_property_set_int(OBJECT(cpu), def->model, "model", errp);
> @@ -1865,6 +1852,25 @@ static void cpu_x86_register(X86CPU *cpu, const char 
> *name, Error **errp)
>          env->features[FEAT_KVM] |= kvm_default_features;
>      }
>      env->features[FEAT_1_ECX] |= CPUID_EXT_HYPERVISOR;
> +
> +    /* sysenter isn't supported in compatibility mode on AMD,
> +     * syscall isn't supported in compatibility mode on Intel.
> +     * Normally we advertise the actual CPU vendor, but you can
> +     * override this using the 'vendor' property if you want to use
> +     * KVM's sysenter/syscall emulation in compatibility mode and
> +     * when doing cross vendor migration
> +     */
> +    const char *vendor = def->vendor;
> +    char host_vendor[CPUID_VENDOR_SZ + 1];

Since when is it OK to declare variables in the middle of the block?
Are you planning to fix that?

Once again I note that a patch to a file under my maintenance was
applied without my review - and promptly a style bug slipped through. It
was not a bug fix, so there was no urgency in applying it.

Andreas

> +    if (kvm_enabled()) {
> +        uint32_t  ebx = 0, ecx = 0, edx = 0;
> +        host_cpuid(0, 0, NULL, &ebx, &ecx, &edx);
> +        x86_cpu_vendor_words2str(host_vendor, ebx, edx, ecx);
> +        vendor = host_vendor;
> +    }
> +
> +    object_property_set_str(OBJECT(cpu), vendor, "vendor", errp);
> +
>  }
>  
>  X86CPU *cpu_x86_create(const char *cpu_model, DeviceState *icc_bridge,

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