[Xen-devel] [PATCH] schedule: mask out XEN_RUNSTATE_UPDATE from state entry time

[Andrii Anisov <andrii.anisov@xxxxxxxxx>]

From: Andrii Anisov <andrii_anisov@xxxxxxxx>

Using XEN_RUNSTATE_UPDATE mask during the process of copying runstate
values to guest causes runstate entry time to be eventually considered
negative on a calculation of the time delta. So the XEN_RUNSTATE_UPDATE
should be masked out during the calculation of the time spent in the
particular runstate.

Signed-off-by: Andrii Anisov <andrii_anisov@xxxxxxxx>
---
 xen/common/schedule.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/xen/common/schedule.c b/xen/common/schedule.c
index 25f6ab3..f4f1a81 100644
--- a/xen/common/schedule.c
+++ b/xen/common/schedule.c
@@ -182,7 +182,9 @@ static inline void vcpu_runstate_change(
 
     trace_runstate_change(v, new_state);
 
-    delta = new_entry_time - v->runstate.state_entry_time;
+    delta = new_entry_time -
+            (v->runstate.state_entry_time & ~XEN_RUNSTATE_UPDATE);
+
     if ( delta > 0 )
     {
         v->runstate.time[v->runstate.state] += delta;
-- 
2.7.4


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