From 85ef7b627c08157edf80e22e5a38750811de52ee Mon Sep 17 00:00:00 2001
From: Gleb Natapov <gleb@redhat.com>
Date: Thu, 21 Jan 2010 13:15:35 -0200
Subject: [PATCH 2/2] reduce number of reinjects on ACK

RH-Author: Gleb Natapov <gleb@redhat.com>
Message-id: <patch-6505-clone-for-rhel55>
Patchwork-id: 6506
O-Subject: [PATCH kvm 5.5 5.4.z 6.0] reduce number of reinjects on ACK
Bugzilla: 556455
RH-Acked-by: Juan Quintela <quintela@redhat.com>
RH-Acked-by: Dor Laor <dlaor@redhat.com>
RH-Acked-by: Marcelo Tosatti <mtosatti@redhat.com>

Windows 7 BSODs under load with HAL_RTC_IRQF_WILL_NOT_CLEAR error.

It happens here:
hal!HalpRtcUnmaskClock:
8281b93a 8bff            mov     edi,edi
8281b93c 56              push    esi
8281b93d 33f6            xor     esi,esi
8281b93f 6a0c            push    0Ch
8281b941 e8b2ffffff      call    hal!CMOS_READ (8281b8f8)
8281b946 84c0            test    al,al
8281b948 7920            jns     hal!HalpRtcUnmaskClock+0x30 (8281b96a)
8281b94a 6a0a            push    0Ah
8281b94c 46              inc     esi
8281b94d e854c8ffff      call    hal!KeStallExecutionProcessor
(828181a6)
8281b952 83fe64          cmp     esi,64h
8281b955 72e8            jb      hal!HalpRtcUnmaskClock+0x5 (8281b93f)
8281b957 6a00            push    0
8281b959 6a00            push    0
8281b95b 6a00            push    0
8281b95d 680a010000      push    10Ah
8281b962 6a5c            push    5Ch
8281b964 ff1500c38082    call    dword ptr [hal!_imp__KeBugCheckEx
(8280c300)]
8281b96a 5e              pop     esi
8281b96b c3              ret

So it loops for 100(64h) times reading register C before BSOD. Lets
reduce number of immediate reinjection well under this limit.

Upstream status: dd17765b5
BZ: 556455

This is for Z stream and 5.5 and 6.0

Signed-off-by: Gleb Natapov <gleb@redhat.com>
---
Tried to subscribe to new rhvirt-patches list, but got no response from
moderators.

--
			Gleb.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
---
 qemu/hw/mc146818rtc.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/qemu/hw/mc146818rtc.c b/qemu/hw/mc146818rtc.c
index d77ee63..247b56a 100644
--- a/qemu/hw/mc146818rtc.c
+++ b/qemu/hw/mc146818rtc.c
@@ -31,7 +31,7 @@
 
 //#define DEBUG_CMOS
 
-#define RTC_REINJECT_ON_ACK_COUNT 1000
+#define RTC_REINJECT_ON_ACK_COUNT 20
 
 #define RTC_SECONDS             0
 #define RTC_SECONDS_ALARM       1
-- 
1.6.3.rc4.29.g8146