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-rw-r--r--qemu/target-i386/kvm.c45
-rw-r--r--qemu/target-i386/kvm_i386.h1
2 files changed, 46 insertions, 0 deletions
diff --git a/qemu/target-i386/kvm.c b/qemu/target-i386/kvm.c
index 066d03d99..721c580ed 100644
--- a/qemu/target-i386/kvm.c
+++ b/qemu/target-i386/kvm.c
@@ -96,6 +96,51 @@ bool kvm_allows_irq0_override(void)
return !kvm_irqchip_in_kernel() || kvm_has_gsi_routing();
}
+static int kvm_get_tsc(CPUState *cs)
+{
+ X86CPU *cpu = X86_CPU(cs);
+ CPUX86State *env = &cpu->env;
+ struct {
+ struct kvm_msrs info;
+ struct kvm_msr_entry entries[1];
+ } msr_data;
+ int ret;
+
+ if (env->tsc_valid) {
+ return 0;
+ }
+
+ msr_data.info.nmsrs = 1;
+ msr_data.entries[0].index = MSR_IA32_TSC;
+ env->tsc_valid = !runstate_is_running();
+
+ ret = kvm_vcpu_ioctl(CPU(cpu), KVM_GET_MSRS, &msr_data);
+ if (ret < 0) {
+ return ret;
+ }
+
+ env->tsc = msr_data.entries[0].data;
+ return 0;
+}
+
+static inline void do_kvm_synchronize_tsc(void *arg)
+{
+ CPUState *cpu = arg;
+
+ kvm_get_tsc(cpu);
+}
+
+void kvm_synchronize_all_tsc(void)
+{
+ CPUState *cpu;
+
+ if (kvm_enabled()) {
+ CPU_FOREACH(cpu) {
+ run_on_cpu(cpu, do_kvm_synchronize_tsc, cpu);
+ }
+ }
+}
+
static struct kvm_cpuid2 *try_get_cpuid(KVMState *s, int max)
{
struct kvm_cpuid2 *cpuid;
diff --git a/qemu/target-i386/kvm_i386.h b/qemu/target-i386/kvm_i386.h
index e557e94f4..c1b312ba2 100644
--- a/qemu/target-i386/kvm_i386.h
+++ b/qemu/target-i386/kvm_i386.h
@@ -15,6 +15,7 @@
bool kvm_allows_irq0_override(void);
bool kvm_has_smm(void);
+void kvm_synchronize_all_tsc(void);
void kvm_arch_reset_vcpu(X86CPU *cs);
void kvm_arch_do_init_vcpu(X86CPU *cs);