1 files changed, 12 insertions, 0 deletions

diff --git a/arch/x86/kernel/pvclock.c b/arch/x86/kernel/pvclock.c
index 05fbe9a0325a..4f9c55f3a7c0 100644
--- a/arch/x86/kernel/pvclock.c
+++ b/arch/x86/kernel/pvclock.c
@@ -97,6 +97,18 @@ static unsigned pvclock_get_time_values(struct pvclock_shadow_time *dst,
         return dst->version;
 }
 
+unsigned long pvclock_tsc_khz(struct pvclock_vcpu_time_info *src)
+{
+        u64 pv_tsc_khz = 1000000ULL << 32;
+
+        do_div(pv_tsc_khz, src->tsc_to_system_mul);
+        if (src->tsc_shift < 0)
+                pv_tsc_khz <<= -src->tsc_shift;
+        else
+                pv_tsc_khz >>= src->tsc_shift;
+        return pv_tsc_khz;
+}
+
 cycle_t pvclock_clocksource_read(struct pvclock_vcpu_time_info *src)
 {
         struct pvclock_shadow_time shadow;