Re: [Qemu-devel] [RFC 2/6] i386: kill cpudef config section support

[Igor Mammedov <imammedo@redhat.com>]

On Fri, 17 Aug 2012 14:53:38 -0300
Eduardo Habkost <ehabkost@redhat.com> wrote:

> It's nice to have a flexible system to maintain CPU models as data, but
> this is holding us from making improvements in the CPU code because it's
> not using the common infra-structure, and because the machine-type data
> is still inside C code.
> 
> Users who want to configure CPU features directly may simply use the
> "-cpu" command-line option (and maybe an equivalent -device option in
> the future) to set CPU features.
>
Have I missed a patch that moves CPU definitions from cpus-x86_64.conf into
the code?
Perhaps they should be added to builtin_x86_defs in this patch.

> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
> ---
>  target-i386/cpu.c | 101
> ++---------------------------------------------------- 1 file changed, 2
> insertions(+), 99 deletions(-)
> 
> diff --git a/target-i386/cpu.c b/target-i386/cpu.c
> index 519a104..71c2ee7 100644
> --- a/target-i386/cpu.c
> +++ b/target-i386/cpu.c
> @@ -237,7 +237,6 @@ typedef struct x86_def_t {
>      uint32_t xlevel;
>      char model_id[48];
>      int vendor_override;
> -    uint32_t flags;
>      /* Store the results of Centaur's CPUID instructions */
>      uint32_t ext4_features;
>      uint32_t xlevel2;
> @@ -1286,7 +1285,7 @@ void x86_cpu_list(FILE *f, fprintf_function
> cpu_fprintf) char buf[256];
>  
>      for (def = x86_defs; def; def = def->next) {
> -        snprintf(buf, sizeof (buf), def->flags ? "[%s]": "%s", def->name);
> +        snprintf(buf, sizeof(buf), "%s", def->name);
>          (*cpu_fprintf)(f, "x86 %16s  %-48s\n", buf, def->model_id);
>      }
>      if (kvm_enabled()) {
> @@ -1380,16 +1379,6 @@ int cpu_x86_register(X86CPU *cpu, const char
> *cpu_model) }
>  
>  #if !defined(CONFIG_USER_ONLY)
> -/* copy vendor id string to 32 bit register, nul pad as needed
> - */
> -static void cpyid(const char *s, uint32_t *id)
> -{
> -    char *d = (char *)id;
> -    char i;
> -
> -    for (i = sizeof (*id); i--; )
> -        *d++ = *s ? *s++ : '\0';
> -}
>  
>  /* interpret radix and convert from string to arbitrary scalar,
>   * otherwise flag failure
> @@ -1403,87 +1392,6 @@ static void cpyid(const char *s, uint32_t *id)
>      *str && !*pend ? (*pval = ul) : (*perr = 1);        \
>  }
>  
> -/* map cpuid options to feature bits, otherwise return failure
> - * (option tags in *str are delimited by whitespace)
> - */
> -static void setfeatures(uint32_t *pval, const char *str,
> -    const char **featureset, int *perr)
> -{
> -    const char *p, *q;
> -
> -    for (q = p = str; *p || *q; q = p) {
> -        while (iswhite(*p))
> -            q = ++p;
> -        while (*p && !iswhite(*p))
> -            ++p;
> -        if (!*q && !*p)
> -            return;
> -        if (!lookup_feature(pval, q, p, featureset)) {
> -            fprintf(stderr, "error: feature \"%.*s\" not available in
> set\n",
> -                (int)(p - q), q);
> -            *perr = 1;
> -            return;
> -        }
> -    }
> -}
> -
> -/* map config file options to x86_def_t form
> - */
> -static int cpudef_setfield(const char *name, const char *str, void *opaque)
> -{
> -    x86_def_t *def = opaque;
> -    int err = 0;
> -
> -    if (!strcmp(name, "name")) {
> -        g_free((void *)def->name);
> -        def->name = g_strdup(str);
> -    } else if (!strcmp(name, "model_id")) {
> -        strncpy(def->model_id, str, sizeof (def->model_id));
> -    } else if (!strcmp(name, "level")) {
> -        setscalar(&def->level, str, &err)
> -    } else if (!strcmp(name, "vendor")) {
> -        cpyid(&str[0], &def->vendor1);
> -        cpyid(&str[4], &def->vendor2);
> -        cpyid(&str[8], &def->vendor3);
> -    } else if (!strcmp(name, "family")) {
> -        setscalar(&def->family, str, &err)
> -    } else if (!strcmp(name, "model")) {
> -        setscalar(&def->model, str, &err)
> -    } else if (!strcmp(name, "stepping")) {
> -        setscalar(&def->stepping, str, &err)
> -    } else if (!strcmp(name, "feature_edx")) {
> -        setfeatures(&def->features, str, feature_name, &err);
> -    } else if (!strcmp(name, "feature_ecx")) {
> -        setfeatures(&def->ext_features, str, ext_feature_name, &err);
> -    } else if (!strcmp(name, "extfeature_edx")) {
> -        setfeatures(&def->ext2_features, str, ext2_feature_name, &err);
> -    } else if (!strcmp(name, "extfeature_ecx")) {
> -        setfeatures(&def->ext3_features, str, ext3_feature_name, &err);
> -    } else if (!strcmp(name, "xlevel")) {
> -        setscalar(&def->xlevel, str, &err)
> -    } else {
> -        fprintf(stderr, "error: unknown option [%s = %s]\n", name, str);
> -        return (1);
> -    }
> -    if (err) {
> -        fprintf(stderr, "error: bad option value [%s = %s]\n", name, str);
> -        return (1);
> -    }
> -    return (0);
> -}
> -
> -/* register config file entry as x86_def_t
> - */
> -static int cpudef_register(QemuOpts *opts, void *opaque)
> -{
> -    x86_def_t *def = g_malloc0(sizeof (x86_def_t));
> -
> -    qemu_opt_foreach(opts, cpudef_setfield, def, 1);
> -    def->next = x86_defs;
> -    x86_defs = def;
> -    return (0);
> -}
> -
>  void cpu_clear_apic_feature(CPUX86State *env)
>  {
>      env->cpuid_features &= ~CPUID_APIC;
> @@ -1491,8 +1399,7 @@ void cpu_clear_apic_feature(CPUX86State *env)
>  
>  #endif /* !CONFIG_USER_ONLY */
>  
> -/* register "cpudef" models defined in configuration file.  Here we first
> - * preload any built-in definitions
> +/* Initialize list of CPU models, filling some non-static fields if
> necessary */
>  void x86_cpudef_setup(void)
>  {
> @@ -1502,7 +1409,6 @@ void x86_cpudef_setup(void)
>      for (i = 0; i < ARRAY_SIZE(builtin_x86_defs); ++i) {
>          x86_def_t *def = &builtin_x86_defs[i];
>          def->next = x86_defs;
> -        def->flags = 1;
>  
>          /* Look for specific "cpudef" models that */
>          /* have the QEMU version in .model_id */
> @@ -1518,9 +1424,6 @@ void x86_cpudef_setup(void)
>  
>          x86_defs = def;
>      }
> -#if !defined(CONFIG_USER_ONLY)
> -    qemu_opts_foreach(qemu_find_opts("cpudef"), cpudef_register, NULL, 0);
> -#endif
>  }
>  
>  static void get_cpuid_vendor(CPUX86State *env, uint32_t *ebx,