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target-i386: kvm_check_features_against_host(): Use feature_word_info

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Instead of carrying the CPUID leaf/register and feature name array on
the model_features_t struct, move that information into
feature_word_info so it can be reused by other functions.

The goal is to eventually kill model_features_t entirely, but to do that
we have to either convert x86_def_t.features to an array or use
offsetof() inside FeatureWordInfo (to replace the pointers inside
model_features_t). So by now just move most of the model_features_t
fields to FeatureWordInfo except for the two pointers to local
arguments.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
This commit is contained in:
Eduardo Habkost 2013-01-07 16:20:46 -02:00 committed by Andreas Färber
parent 5ef5787627
commit bffd67b01d
1 changed files with 49 additions and 24 deletions
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69
target-i386/cpu.c
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@ -126,16 +126,39 @@ 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 */
} FeatureWordInfo;
static FeatureWordInfo feature_word_info[FEATURE_WORDS] = {
[FEAT_1_EDX] = { .feat_names = feature_name },
[FEAT_1_ECX] = { .feat_names = ext_feature_name },
[FEAT_8000_0001_EDX] = { .feat_names = ext2_feature_name },
[FEAT_8000_0001_ECX] = { .feat_names = ext3_feature_name },
[FEAT_KVM] = { .feat_names = kvm_feature_name },
[FEAT_SVM] = { .feat_names = svm_feature_name },
[FEAT_7_0_EBX] = { .feat_names = cpuid_7_0_ebx_feature_name },
[FEAT_1_EDX] = {
.feat_names = feature_name,
.cpuid_eax = 1, .cpuid_reg = R_EDX,
},
[FEAT_1_ECX] = {
.feat_names = ext_feature_name,
.cpuid_eax = 1, .cpuid_reg = R_ECX,
},
[FEAT_8000_0001_EDX] = {
.feat_names = ext2_feature_name,
.cpuid_eax = 0x80000001, .cpuid_reg = R_EDX,
},
[FEAT_8000_0001_ECX] = {
.feat_names = ext3_feature_name,
.cpuid_eax = 0x80000001, .cpuid_reg = R_ECX,
},
[FEAT_KVM] = {
.feat_names = kvm_feature_name,
.cpuid_eax = KVM_CPUID_FEATURES, .cpuid_reg = R_EAX,
},
[FEAT_SVM] = {
.feat_names = svm_feature_name,
.cpuid_eax = 0x8000000A, .cpuid_reg = R_EDX,
},
[FEAT_7_0_EBX] = {
.feat_names = cpuid_7_0_ebx_feature_name,
.cpuid_eax = 7, .cpuid_reg = R_EBX,
},
};
const char *get_register_name_32(unsigned int reg)
@ -162,9 +185,7 @@ const char *get_register_name_32(unsigned int reg)
typedef struct model_features_t {
uint32_t *guest_feat;
uint32_t *host_feat;
const char **flag_names;
uint32_t cpuid;
int reg;
FeatureWord feat_word;
} model_features_t;
int check_cpuid = 0;
@ -962,19 +983,19 @@ static void kvm_cpu_fill_host(x86_def_t *x86_cpu_def)
#endif /* CONFIG_KVM */
}
static int unavailable_host_feature(struct model_features_t *f, uint32_t mask)
static int unavailable_host_feature(FeatureWordInfo *f, uint32_t mask)
{
int i;
for (i = 0; i < 32; ++i)
if (1 << i & mask) {
const char *reg = get_register_name_32(f->reg);
const char *reg = get_register_name_32(f->cpuid_reg);
assert(reg);
fprintf(stderr, "warning: host doesn't support requested feature: "
"CPUID.%02XH:%s%s%s [bit %d]\n",
f->cpuid, reg,
f->flag_names[i] ? "." : "",
f->flag_names[i] ? f->flag_names[i] : "", i);
f->cpuid_eax, reg,
f->feat_names[i] ? "." : "",
f->feat_names[i] ? f->feat_names[i] : "", i);
break;
}
return 0;
@ -992,25 +1013,29 @@ static int kvm_check_features_against_host(x86_def_t *guest_def)
int rv, i;
struct model_features_t ft[] = {
{&guest_def->features, &host_def.features,
feature_name, 0x00000001, R_EDX},
FEAT_1_EDX },
{&guest_def->ext_features, &host_def.ext_features,
ext_feature_name, 0x00000001, R_ECX},
FEAT_1_ECX },
{&guest_def->ext2_features, &host_def.ext2_features,
ext2_feature_name, 0x80000001, R_EDX},
FEAT_8000_0001_EDX },
{&guest_def->ext3_features, &host_def.ext3_features,
ext3_feature_name, 0x80000001, R_ECX}
FEAT_8000_0001_ECX },
};
assert(kvm_enabled());
kvm_cpu_fill_host(&host_def);
for (rv = 0, i = 0; i < ARRAY_SIZE(ft); ++i)
for (mask = 1; mask; mask <<= 1)
for (rv = 0, i = 0; i < ARRAY_SIZE(ft); ++i) {
FeatureWord w = ft[i].feat_word;
FeatureWordInfo *wi = &feature_word_info[w];
for (mask = 1; mask; mask <<= 1) {
if (*ft[i].guest_feat & mask &&
!(*ft[i].host_feat & mask)) {
unavailable_host_feature(&ft[i], mask);
unavailable_host_feature(wi, mask);
rv = 1;
}
}
}
return rv;
}