kvmclock: add a new function to update env->tsc.

The commit 317b0a6d8 fixed an issue which caused by the outdated
env->tsc value, but the fix lead to 'cpu_synchronize_all_states()'
called twice during live migration. The 'cpu_synchronize_all_states()'
takes about 130us for a VM which has 4 vcpus, it's a bit expensive.

Synchronize the whole CPU context just for updating env->tsc is too
wasting, this patch use a new function to update the env->tsc.
Comparing to 'cpu_synchronize_all_states()', it only takes about 20us.

Signed-off-by: Liang Li <liang.z.li@intel.com>
Message-Id: <1446695464-27116-2-git-send-email-liang.z.li@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

2 files changed, 46 insertions, 0 deletions

diff --git a/target-i386/kvm.c b/target-i386/kvm.c
index 64046cb69d..2a9953b2d4 100644
--- a/target-i386/kvm.c
+++ b/target-i386/kvm.c
@@ -111,6 +111,51 @@ 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/target-i386/kvm_i386.h b/target-i386/kvm_i386.h
index e557e94f44..c1b312ba2a 100644
--- a/target-i386/kvm_i386.h
+++ b/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);