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qemu-x86: Add tsc_freq option to -cpu 

To let the user configure the desired tsc frequency for the
guest if running in KVM.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Joerg Roedel 2011-07-07 16:13:12 +02:00 committed by Marcelo Tosatti
parent a732e1baa8
commit b862d1fe42
2 changed files with 14 additions and 0 deletions
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1
target-i386/cpu.h
View File

@ -743,6 +743,7 @@ typedef struct CPUX86State {
uint32_t cpuid_kvm_features;
uint32_t cpuid_svm_features;
bool tsc_valid;
int tsc_khz;
/* in order to simplify APIC support, we leave this pointer to the
user */

13
target-i386/cpuid.c
View File

@ -224,6 +224,7 @@ typedef struct x86_def_t {
int family;
int model;
int stepping;
int tsc_khz;
uint32_t features, ext_features, ext2_features, ext3_features;
uint32_t kvm_features, svm_features;
uint32_t xlevel;
@ -704,6 +705,17 @@ static int cpu_x86_find_by_name(x86_def_t *x86_cpu_def, const char *cpu_model)
} else if (!strcmp(featurestr, "model_id")) {
pstrcpy(x86_cpu_def->model_id, sizeof(x86_cpu_def->model_id),
val);
} else if (!strcmp(featurestr, "tsc_freq")) {
int64_t tsc_freq;
char *err;
tsc_freq = strtosz_suffix_unit(val, &err,
STRTOSZ_DEFSUFFIX_B, 1000);
if (!*val || *err) {
fprintf(stderr, "bad numerical value %s\n", val);
goto error;
}
x86_cpu_def->tsc_khz = tsc_freq / 1000;
} else {
fprintf(stderr, "unrecognized feature %s\n", featurestr);
goto error;
@ -872,6 +884,7 @@ int cpu_x86_register (CPUX86State *env, const char *cpu_model)
env->cpuid_svm_features = def->svm_features;
env->cpuid_ext4_features = def->ext4_features;
env->cpuid_xlevel2 = def->xlevel2;
env->tsc_khz = def->tsc_khz;
if (!kvm_enabled()) {
env->cpuid_features &= TCG_FEATURES;
env->cpuid_ext_features &= TCG_EXT_FEATURES;