From: kaf24@firebug.cl.cam.ac.uk <kaf24@firebug.cl.cam.ac.uk>
Date: Wed, 7 Jun 2006 12:42:21 +0000 (+0100)
Subject: [HVM][PIT] Fix missed_ticks() logic.
X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~15972^2~46
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=e56ed2dc521d9eccbcfb4db7de22ab621705864f;p=xen.git

[HVM][PIT] Fix missed_ticks() logic.
Signed-off-by Xiaowei Yang <xiaowei.yang@intel.com>
---

diff --git a/xen/arch/x86/hvm/intercept.c b/xen/arch/x86/hvm/intercept.c
index 11884399c2..25a715cdfd 100644
--- a/xen/arch/x86/hvm/intercept.c
+++ b/xen/arch/x86/hvm/intercept.c
@@ -216,13 +216,14 @@ void hlt_timer_fn(void *data)
 
 static __inline__ void missed_ticks(struct periodic_time *pt)
 {
-    int missed_ticks;
+    s_time_t missed_ticks;
 
-    missed_ticks = (NOW() - pt->scheduled)/(s_time_t) pt->period;
-    if ( missed_ticks++ >= 0 ) {
+    missed_ticks = NOW() - pt->scheduled;
+    if ( missed_ticks > 0 ) {
+	missed_ticks = missed_ticks / (s_time_t) pt->period + 1;
         if ( missed_ticks > 1000 ) {
             /* TODO: Adjust guest time togther */
-            pt->pending_intr_nr ++;
+            pt->pending_intr_nr++;
         }
         else {
             pt->pending_intr_nr += missed_ticks;
@@ -237,6 +238,9 @@ void pt_timer_fn(void *data)
     struct vcpu *v = data;
     struct periodic_time *pt = &(v->domain->arch.hvm_domain.pl_time.periodic_tm);
 
+    pt->pending_intr_nr++;
+    pt->scheduled += pt->period;
+
     /* pick up missed timer tick */
     missed_ticks(pt);
     if ( test_bit(_VCPUF_running, &v->vcpu_flags) ) {