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[Qemu-devel] [PATCH 1/2] qemu-x86: Add tsc_khz option to -cpu
From: |
Joerg Roedel |
Subject: |
[Qemu-devel] [PATCH 1/2] qemu-x86: Add tsc_khz option to -cpu |
Date: |
Fri, 17 Jun 2011 16:00:13 +0200 |
To let the user configure the desired tsc frequency for the
guest if running in KVM.
Signed-off-by: Joerg Roedel <address@hidden>
---
target-i386/cpu.h | 1 +
target-i386/cpuid.c | 10 ++++++++++
2 files changed, 11 insertions(+), 0 deletions(-)
diff --git a/target-i386/cpu.h b/target-i386/cpu.h
index 0b039d4..a381c34 100644
--- a/target-i386/cpu.h
+++ b/target-i386/cpu.h
@@ -753,6 +753,7 @@ 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 */
diff --git a/target-i386/cpuid.c b/target-i386/cpuid.c
index 79e7580..2b59e66 100644
--- a/target-i386/cpuid.c
+++ b/target-i386/cpuid.c
@@ -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 +705,14 @@ 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_khz")) {
+ char *err;
+ numvalue = strtoul(val, &err, 0);
+ if (!*val || *err) {
+ fprintf(stderr, "bad numerical value %s\n", val);
+ goto error;
+ }
+ x86_cpu_def->tsc_khz = numvalue;
} else {
fprintf(stderr, "unrecognized feature %s\n", featurestr);
goto error;
@@ -872,6 +881,7 @@ 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;
--
1.7.4.1