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target-i386: Move features logic that requires CPUState to realize time

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Making x86_cpu_parse_featurestr() a pure convertor
of legacy feature string into global properties, needs
it to be called before a CPU instance is created so
parser shouldn't modify CPUState directly or access
it at all. Hence move current hack that directly pokes
into CPUState, to set/unset +-feats, from parser to
CPU's realize method.

Backports commit dc15c0517b010a9444a2c05794dae980f2a2cbd9 from qemu
This commit is contained in:
Igor Mammedov 2018-02-24 18:44:40 -05:00 committed by Lioncash
parent b9ca5c4d33
commit 800b28483b
No known key found for this signature in database
GPG key ID: 4E3C3CC1031BA9C7
2 changed files with 65 additions and 24 deletions
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84
qemu/target-i386/cpu.c
View file

@ -589,6 +589,31 @@ const char *get_register_name_32(unsigned int reg)
#include <intrin.h>
#endif
/*
* Returns the set of feature flags that are supported and migratable by
* QEMU, for a given FeatureWord.
*/
static uint32_t x86_cpu_get_migratable_flags(FeatureWord w)
{
FeatureWordInfo *wi = &feature_word_info[w];
uint32_t r = 0;
int i;
for (i = 0; i < 32; i++) {
uint32_t f = 1U << i;
/* If the feature name is unknown, it is not supported by QEMU yet */
if (!wi->feat_names[i]) {
continue;
}
/* Skip features known to QEMU, but explicitly marked as unmigratable */
if (wi->unmigratable_flags & f) {
continue;
}
r |= f;
}
return r;
}
void host_cpuid(uint32_t function, uint32_t count,
uint32_t *eax, uint32_t *ebx, uint32_t *ecx, uint32_t *edx)
{
@ -1626,7 +1651,8 @@ static X86CPUDefinition builtin_x86_defs[] = {
},
};
static uint32_t x86_cpu_get_supported_feature_word(struct uc_struct *uc, FeatureWord w);
static uint32_t x86_cpu_get_supported_feature_word(struct uc_struct *uc,
FeatureWord w, bool migratable);
static void report_unavailable_features(FeatureWord w, uint32_t mask)
{
@ -1986,22 +2012,20 @@ static void x86_cpu_parse_featurestr(CPUState *cs, char *features,
{
X86CPU *cpu = X86_CPU(cs->uc, cs);
char *featurestr; /* Single 'key=value" string being parsed */
FeatureWord w;
/* Features to be added */
FeatureWordArray plus_features = { 0 };
/* Features to be removed */
FeatureWordArray minus_features = { 0 };
CPUX86State *env = &cpu->env;
Error *local_err = NULL;
// Unicorn: added for consistent zeroing out
memset(cpu->plus_features, 0, sizeof(cpu->plus_features));
memset(cpu->minus_features, 0, sizeof(cpu->minus_features));
featurestr = features ? strtok(features, ",") : NULL;
while (featurestr) {
char *val;
if (featurestr[0] == '+') {
add_flagname_to_bitmaps(featurestr + 1, plus_features, &local_err);
add_flagname_to_bitmaps(featurestr + 1, cpu->plus_features, &local_err);
} else if (featurestr[0] == '-') {
add_flagname_to_bitmaps(featurestr + 1, minus_features, &local_err);
add_flagname_to_bitmaps(featurestr + 1, cpu->minus_features, &local_err);
} else if ((val = strchr(featurestr, '='))) {
*val = 0; val++;
feat2prop(featurestr);
@ -2030,29 +2054,23 @@ static void x86_cpu_parse_featurestr(CPUState *cs, char *features,
}
featurestr = strtok(NULL, ",");
}
if (cpu->host_features) {
for (w = 0; w < FEATURE_WORDS; w++) {
env->features[w] =
x86_cpu_get_supported_feature_word(env->uc, w);
}
}
for (w = 0; w < FEATURE_WORDS; w++) {
env->features[w] |= plus_features[w];
env->features[w] &= ~minus_features[w];
}
}
static uint32_t x86_cpu_get_supported_feature_word(struct uc_struct *uc, FeatureWord w)
static uint32_t x86_cpu_get_supported_feature_word(struct uc_struct *uc,
FeatureWord w, bool migratable_only)
{
FeatureWordInfo *wi = &feature_word_info[w];
uint32_t r;
if (tcg_enabled(uc)) {
return wi->tcg_features;
r = wi->tcg_features;
} else {
return ~0;
}
if (migratable_only) {
r &= x86_cpu_get_migratable_flags(w);
}
return r;
}
/*
@ -2067,7 +2085,7 @@ static int x86_cpu_filter_features(X86CPU *cpu)
int rv = 0;
for (w = 0; w < FEATURE_WORDS; w++) {
uint32_t host_feat = x86_cpu_get_supported_feature_word(env->uc, w);
uint32_t host_feat = x86_cpu_get_supported_feature_word(env->uc, w, cpu->migratable);
uint32_t requested_features = env->features[w];
env->features[w] &= host_feat;
cpu->filtered_features[w] = requested_features & ~env->features[w];
@ -2814,6 +2832,7 @@ static int x86_cpu_realizefn(struct uc_struct *uc, DeviceState *dev, Error **err
X86CPUClass *xcc = X86_CPU_GET_CLASS(uc, dev);
CPUX86State *env = &cpu->env;
Error *local_err = NULL;
FeatureWord w;
if (cpu->apic_id < 0) {
error_setg(errp, "apic-id property was not initialized properly");
@ -2824,6 +2843,23 @@ static int x86_cpu_realizefn(struct uc_struct *uc, DeviceState *dev, Error **err
env->cpuid_level = 7;
}
/*TODO: cpu->host_features incorrectly overwrites features
* set using "feat=on|off". Once we fix this, we can convert
* plus_features & minus_features to global properties
* inside x86_cpu_parse_featurestr() too.
*/
if (cpu->host_features) {
for (w = 0; w < FEATURE_WORDS; w++) {
env->features[w] =
x86_cpu_get_supported_feature_word(uc, w, cpu->migratable);
}
}
for (w = 0; w < FEATURE_WORDS; w++) {
cpu->env.features[w] |= cpu->plus_features[w];
cpu->env.features[w] &= ~cpu->minus_features[w];
}
/* On AMD CPUs, some CPUID[8000_0001].EDX bits must match the bits on
* CPUID[1].EDX.
*/

5
qemu/target-i386/cpu.h
View file

@ -1172,6 +1172,11 @@ typedef struct X86CPU {
user */
struct DeviceState *apic_state;
struct MemoryRegion *cpu_as_root;
/* Features to be added */
FeatureWordArray plus_features;
/* Features to be removed */
FeatureWordArray minus_features;
} X86CPU;
static inline X86CPU *x86_env_get_cpu(CPUX86State *env)