1 files changed, 7 insertions, 0 deletions

diff --git a/arch/x86_64/kernel/tsc.c b/arch/x86_64/kernel/tsc.c
index 8c92f2fe7e2e..895831865019 100644
--- a/arch/x86_64/kernel/tsc.c
+++ b/arch/x86_64/kernel/tsc.c
@@ -180,6 +180,12 @@ static cycle_t read_tsc(void)
         return ret;
 }
 
+static cycle_t __vsyscall_fn vread_tsc(void)
+{
+        cycle_t ret = (cycle_t)get_cycles_sync();
+        return ret;
+}
+
 static struct clocksource clocksource_tsc = {
         .name                   = "tsc",
         .rating                 = 300,
@@ -188,6 +194,7 @@ static struct clocksource clocksource_tsc = {
         .shift                  = 22,
         .flags                  = CLOCK_SOURCE_IS_CONTINUOUS |
                                   CLOCK_SOURCE_MUST_VERIFY,
+        .vread                  = vread_tsc,
 };
 
 void mark_tsc_unstable(void)