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Re: [libvirt] [Qemu-devel] [PATCH qom-cpu 5/9] target-i386: Add ECX information to FeatureWordInfo



Am 22.04.2013 21:00, schrieb Eduardo Habkost:
> FEAT_7_0_EBX uses ECX as input, so we have to take that into account
> when reporting feature word values.
> 
> Signed-off-by: Eduardo Habkost <ehabkost redhat com>
> ---
>  target-i386/cpu.c | 10 +++++++---
>  1 file changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/target-i386/cpu.c b/target-i386/cpu.c
> index 110ef98..314931e 100644
> --- a/target-i386/cpu.c
> +++ b/target-i386/cpu.c
> @@ -151,8 +151,10 @@ static const char *cpuid_7_0_ebx_feature_name[] = {
>  
>  typedef struct FeatureWordInfo {
>      const char **feat_names;
> -    uint32_t cpuid_eax; /* Input EAX for CPUID */
> -    int cpuid_reg;      /* R_* register constant */
> +    uint32_t cpuid_eax;   /* Input EAX for CPUID */

> +    bool cpuid_needs_ecx; /* CPUID instruction uses ECX as input */

Why do we need this needs_ field here? eax and reg just seem to be
reindented and the comment reworded for reg.

It just seems to be passed through to has_cpuid_input_ecx, which I
neither see defined nor checked - that data structure already existed
elsewhere as such?

Andreas

> +    uint32_t cpuid_ecx;   /* Input ECX value for CPUID */
> +    int cpuid_reg;        /* output register (R_* constant) */
>  } FeatureWordInfo;
>  
>  static FeatureWordInfo feature_word_info[FEATURE_WORDS] = {
> @@ -186,7 +188,9 @@ static FeatureWordInfo feature_word_info[FEATURE_WORDS] = {
>      },
>      [FEAT_7_0_EBX] = {
>          .feat_names = cpuid_7_0_ebx_feature_name,
> -        .cpuid_eax = 7, .cpuid_reg = R_EBX,
> +        .cpuid_eax = 7,
> +        .cpuid_needs_ecx = true, .cpuid_ecx = 0,
> +        .cpuid_reg = R_EBX,
>      },
>  };
>  
> 


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