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[Xen-devel] [PATCH, v3] x86/HVM: RTC periodic timer emulation adjustments


  • To: "xen-devel" <xen-devel@xxxxxxxxxxxxx>
  • From: "Jan Beulich" <JBeulich@xxxxxxxx>
  • Date: Fri, 31 Aug 2012 17:01:14 +0100
  • Delivery-date: Fri, 31 Aug 2012 16:01:35 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xen.org>

- don't call rtc_timer_update() on REG_A writes when the value didn't
  change (doing the call always was reported to cause wall clock time
  lagging with the JVM running on Windows)
- don't call rtc_timer_update() on REG_B writes when RTC_PIE didn't
  change

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

---
v3: Break out just this change from the previously submitted much
    larger patch. The rest of that one is now planned to go in only
    after 4.2.

--- a/xen/arch/x86/hvm/rtc.c
+++ b/xen/arch/x86/hvm/rtc.c
@@ -365,6 +365,7 @@ static int rtc_ioport_write(void *opaque
 {
     RTCState *s = opaque;
     struct domain *d = vrtc_domain(s);
+    uint32_t orig;
 
     spin_lock(&s->lock);
 
@@ -382,6 +383,7 @@ static int rtc_ioport_write(void *opaque
         return 0;
     }
 
+    orig = s->hw.cmos_data[s->hw.cmos_index];
     switch ( s->hw.cmos_index )
     {
     case RTC_SECONDS_ALARM:
@@ -405,9 +407,9 @@ static int rtc_ioport_write(void *opaque
         break;
     case RTC_REG_A:
         /* UIP bit is read only */
-        s->hw.cmos_data[RTC_REG_A] = (data & ~RTC_UIP) |
-            (s->hw.cmos_data[RTC_REG_A] & RTC_UIP);
-        rtc_timer_update(s);
+        s->hw.cmos_data[RTC_REG_A] = (data & ~RTC_UIP) | (orig & RTC_UIP);
+        if ( (data ^ orig) & (RTC_RATE_SELECT | RTC_DIV_CTL) )
+            rtc_timer_update(s);
         break;
     case RTC_REG_B:
         if ( data & RTC_SET )
@@ -436,7 +438,8 @@ static int rtc_ioport_write(void *opaque
                 hvm_isa_irq_assert(d, RTC_IRQ);
             }
         s->hw.cmos_data[RTC_REG_B] = data;
-        rtc_timer_update(s);
+        if ( (data ^ orig) & RTC_PIE )
+            rtc_timer_update(s);
         check_update_timer(s);
         alarm_timer_update(s);
         break;



Attachment: x86-hvm-rtc-periodic.patch
Description: Text document

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