[Xen-changelog] [xen-unstable] x86 hvm: fix missing ticks bug of c/s 20218

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1253602836 -3600
# Node ID 6c178ba4d86a0380ee1a07f8c8632421b5539514
# Parent  3a71e070e3c5681d4394c943b6b0a17e8dab1720
x86 hvm: fix missing ticks bug of c/s 20218

With c/s 20218, timer ticks might be missed when IRQs of a timer are
queued. "Next scheduled time" is accumulated wrongly.

Thanks to Christoph for the report.

Signed-off-by: Kouya Shimura <kouya@xxxxxxxxxxxxxx>
Reported-by: Christoph Egger <Christoph.Egger@xxxxxxx>
---
 xen/arch/x86/hvm/vpt.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletion(-)

diff -r 3a71e070e3c5 -r 6c178ba4d86a xen/arch/x86/hvm/vpt.c
--- a/xen/arch/x86/hvm/vpt.c    Fri Sep 18 14:45:40 2009 +0100
+++ b/xen/arch/x86/hvm/vpt.c    Tue Sep 22 08:00:36 2009 +0100
@@ -309,7 +309,6 @@ void pt_intr_post(struct vcpu *v, struct
     else
     {
         pt->scheduled += pt->period;
-        pt_process_missed_ticks(pt);
 
         if ( mode_is(v->domain, one_missed_tick_pending) ||
              mode_is(v->domain, no_missed_ticks_pending) )
@@ -324,7 +323,11 @@ void pt_intr_post(struct vcpu *v, struct
         }
 
         if ( pt->pending_intr_nr == 0 )
+        {
+            pt_process_missed_ticks(pt);
+            pt->do_not_freeze = 0;
             set_timer(&pt->timer, pt->scheduled);
+        }
     }
 
     if ( mode_is(v->domain, delay_for_missed_ticks) &&

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