Re: [Qemu-devel] [PATCH 02/20] target-i386: sanitize AMD's ext2_features at realize time

[Eduardo Habkost]

On Thu, Dec 27, 2012 at 03:59:18PM +0100, Igor Mammedov wrote:
> when CPU properties are implemented, ext2_features may change
> between object_new(CPU) and cpu_realize_fn(). Sanitizing
> ext2_features for AMD based CPU at realize() time will keep
> current behavior after CPU features are converted to properties.
> 
> Signed-off-by: Igor Mammedov <address@hidden>
> Reviewed-by: Eduardo Habkost <address@hidden>

To confirm that this specific submission is OK to me:

Reviewed-by: Eduardo Habkost <address@hidden>


> ---
> v2:
>   - style fix, make line shorter than 80 characters
> ---
>  target-i386/cpu.c |   21 +++++++++++----------
>  1 files changed, 11 insertions(+), 10 deletions(-)
> 
> diff --git a/target-i386/cpu.c b/target-i386/cpu.c
> index 63aae86..64b7637 100644
> --- a/target-i386/cpu.c
> +++ b/target-i386/cpu.c
> @@ -1539,16 +1539,6 @@ int cpu_x86_register(X86CPU *cpu, const char 
> *cpu_model)
>      object_property_set_int(OBJECT(cpu), (int64_t)def->tsc_khz * 1000,
>                              "tsc-frequency", &error);
>  
> -    /* On AMD CPUs, some CPUID[8000_0001].EDX bits must match the bits on
> -     * CPUID[1].EDX.
> -     */
> -    if (env->cpuid_vendor1 == CPUID_VENDOR_AMD_1 &&
> -            env->cpuid_vendor2 == CPUID_VENDOR_AMD_2 &&
> -            env->cpuid_vendor3 == CPUID_VENDOR_AMD_3) {
> -        env->cpuid_ext2_features &= ~CPUID_EXT2_AMD_ALIASES;
> -        env->cpuid_ext2_features |= (def->features & CPUID_EXT2_AMD_ALIASES);
> -    }
> -
>      object_property_set_str(OBJECT(cpu), def->model_id, "model-id", &error);
>      if (error) {
>          fprintf(stderr, "%s\n", error_get_pretty(error));
> @@ -2062,6 +2052,17 @@ void x86_cpu_realize(Object *obj, Error **errp)
>          env->cpuid_level = 7;
>      }
>  
> +    /* On AMD CPUs, some CPUID[8000_0001].EDX bits must match the bits on
> +     * CPUID[1].EDX.
> +     */
> +    if (env->cpuid_vendor1 == CPUID_VENDOR_AMD_1 &&
> +        env->cpuid_vendor2 == CPUID_VENDOR_AMD_2 &&
> +        env->cpuid_vendor3 == CPUID_VENDOR_AMD_3) {
> +        env->cpuid_ext2_features &= ~CPUID_EXT2_AMD_ALIASES;
> +        env->cpuid_ext2_features |= (env->cpuid_features
> +           &  CPUID_EXT2_AMD_ALIASES);
> +    }
> +
>      if (!kvm_enabled()) {
>          env->cpuid_features &= TCG_FEATURES;
>          env->cpuid_ext_features &= TCG_EXT_FEATURES;
> -- 
> 1.7.1
> 

-- 
Eduardo