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target-i386: Introduce generic CPUID feature compat function

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Introduce x86_cpu_compat_set_features(), that can be used to set/unset
feature bits on specific CPU models for machine-type compatibility.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
This commit is contained in:
Eduardo Habkost 2013-04-25 15:43:00 -03:00 committed by Andreas Färber
parent b2a856d992
commit 0668af542f
2 changed files with 30 additions and 0 deletions
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26
target-i386/cpu.c
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@ -971,6 +971,32 @@ static x86_def_t builtin_x86_defs[] = {
}, },
}; };
/**
* x86_cpu_compat_set_features:
* @cpu_model: CPU model name to be changed. If NULL, all CPU models are changed
* @w: Identifies the feature word to be changed.
* @feat_add: Feature bits to be added to feature word
* @feat_remove: Feature bits to be removed from feature word
*
* Change CPU model feature bits for compatibility.
*
* This function may be used by machine-type compatibility functions
* to enable or disable feature bits on specific CPU models.
*/
void x86_cpu_compat_set_features(const char *cpu_model, FeatureWord w,
uint32_t feat_add, uint32_t feat_remove)
{
x86_def_t *def;
int i;
for (i = 0; i < ARRAY_SIZE(builtin_x86_defs); i++) {
def = &builtin_x86_defs[i];
if (!cpu_model || !strcmp(cpu_model, def->name)) {
def->features[w] |= feat_add;
def->features[w] &= ~feat_remove;
}
}
}
#ifdef CONFIG_KVM #ifdef CONFIG_KVM
static int cpu_x86_fill_model_id(char *str) static int cpu_x86_fill_model_id(char *str)
{ {

4
target-i386/cpu.h
View File

@ -1255,6 +1255,10 @@ void cpu_report_tpr_access(CPUX86State *env, TPRAccess access);
void disable_kvm_pv_eoi(void); void disable_kvm_pv_eoi(void);
void x86_cpu_compat_set_features(const char *cpu_model, FeatureWord w,
uint32_t feat_add, uint32_t feat_remove);
/* Return name of 32-bit register, from a R_* constant */ /* Return name of 32-bit register, from a R_* constant */
const char *get_register_name_32(unsigned int reg); const char *get_register_name_32(unsigned int reg);