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target/i386: handle filtered_features in a new function mark_unavailable_features 

The next patch will add a different reason for filtering features, unrelated
to host feature support.  Extract a new function that takes care of disabling
the features and optionally reporting them.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2019-07-02 15:32:41 +02:00
parent 9e5ef16491
commit 245edd0cfb
1 changed files with 48 additions and 39 deletions
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87
target/i386/cpu.c
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@ -3096,17 +3096,41 @@ static char *feature_word_description(FeatureWordInfo *f, uint32_t bit)
return NULL;
}
static void report_unavailable_features(FeatureWord w, uint32_t mask)
static bool x86_cpu_have_filtered_features(X86CPU *cpu)
{
FeatureWord w;
for (w = 0; w < FEATURE_WORDS; w++) {
if (cpu->filtered_features[w]) {
return true;
}
}
return false;
}
static void mark_unavailable_features(X86CPU *cpu, FeatureWord w, uint32_t mask,
const char *verbose_prefix)
{
CPUX86State *env = &cpu->env;
FeatureWordInfo *f = &feature_word_info[w];
int i;
char *feat_word_str;
if (!cpu->force_features) {
env->features[w] &= ~mask;
}
cpu->filtered_features[w] |= mask;
if (!verbose_prefix) {
return;
}
for (i = 0; i < 32; ++i) {
if ((1UL << i) & mask) {
feat_word_str = feature_word_description(f, i);
warn_report("%s doesn't support requested feature: %s%s%s [bit %d]",
accel_uses_host_cpuid() ? "host" : "TCG",
warn_report("%s: %s%s%s [bit %d]",
verbose_prefix,
feat_word_str,
f->feat_names[i] ? "." : "",
f->feat_names[i] ? f->feat_names[i] : "", i);
@ -3511,7 +3535,7 @@ static void x86_cpu_parse_featurestr(const char *typename, char *features,
}
static void x86_cpu_expand_features(X86CPU *cpu, Error **errp);
static int x86_cpu_filter_features(X86CPU *cpu);
static void x86_cpu_filter_features(X86CPU *cpu, bool verbose);
/* Build a list with the name of all features on a feature word array */
static void x86_cpu_list_feature_names(FeatureWordArray features,
@ -3576,7 +3600,7 @@ static void x86_cpu_class_check_missing_features(X86CPUClass *xcc,
next = &new->next;
}
x86_cpu_filter_features(xc);
x86_cpu_filter_features(xc, false);
x86_cpu_list_feature_names(xc->filtered_features, next);
@ -3784,15 +3808,6 @@ static uint32_t x86_cpu_get_supported_feature_word(FeatureWord w,
return r;
}
static void x86_cpu_report_filtered_features(X86CPU *cpu)
{
FeatureWord w;
for (w = 0; w < FEATURE_WORDS; w++) {
report_unavailable_features(w, cpu->filtered_features[w]);
}
}
static void x86_cpu_apply_props(X86CPU *cpu, PropValue *props)
{
PropValue *pv;
@ -5154,24 +5169,24 @@ out:
*
* Returns: 0 if all flags are supported by the host, non-zero otherwise.
*/
static int x86_cpu_filter_features(X86CPU *cpu)
static void x86_cpu_filter_features(X86CPU *cpu, bool verbose)
{
CPUX86State *env = &cpu->env;
FeatureWord w;
int rv = 0;
const char *prefix = NULL;
if (verbose) {
prefix = accel_uses_host_cpuid()
? "host doesn't support requested feature"
: "TCG doesn't support requested feature";
}
for (w = 0; w < FEATURE_WORDS; w++) {
uint32_t host_feat =
x86_cpu_get_supported_feature_word(w, false);
uint32_t requested_features = env->features[w];
uint32_t available_features = requested_features & host_feat;
if (!cpu->force_features) {
env->features[w] = available_features;
}
cpu->filtered_features[w] = requested_features & ~available_features;
if (cpu->filtered_features[w]) {
rv = 1;
}
uint32_t unavailable_features = requested_features & ~host_feat;
mark_unavailable_features(cpu, w, unavailable_features, prefix);
}
if ((env->features[FEAT_7_0_EBX] & CPUID_7_0_EBX_INTEL_PT) &&
@ -5197,13 +5212,9 @@ static int x86_cpu_filter_features(X86CPU *cpu)
* host can't emulate the capabilities we report on
* cpu_x86_cpuid(), intel-pt can't be enabled on the current host.
*/
env->features[FEAT_7_0_EBX] &= ~CPUID_7_0_EBX_INTEL_PT;
cpu->filtered_features[FEAT_7_0_EBX] |= CPUID_7_0_EBX_INTEL_PT;
rv = 1;
mark_unavailable_features(cpu, FEAT_7_0_EBX, CPUID_7_0_EBX_INTEL_PT, prefix);
}
}
return rv;
}
static void x86_cpu_realizefn(DeviceState *dev, Error **errp)
@ -5244,16 +5255,14 @@ static void x86_cpu_realizefn(DeviceState *dev, Error **errp)
goto out;
}
if (x86_cpu_filter_features(cpu) &&
(cpu->check_cpuid || cpu->enforce_cpuid)) {
x86_cpu_report_filtered_features(cpu);
if (cpu->enforce_cpuid) {
error_setg(&local_err,
accel_uses_host_cpuid() ?
"Host doesn't support requested features" :
"TCG doesn't support requested features");
goto out;
}
x86_cpu_filter_features(cpu, cpu->check_cpuid || cpu->enforce_cpuid);
if (cpu->enforce_cpuid && x86_cpu_have_filtered_features(cpu)) {
error_setg(&local_err,
accel_uses_host_cpuid() ?
"Host doesn't support requested features" :
"TCG doesn't support requested features");
goto out;
}
/* On AMD CPUs, some CPUID[8000_0001].EDX bits must match the bits on