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Date: Wed, 12 Dec 2007 06:36:44 -0800 (PST)
From: TeLeMan <geleman@gmail.com>
Subject: [Qemu-devel] [RFC PATCH] ACPI timer fix
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To: qemu-devel@nongnu.org


tmr_overflow_time is updated only once on guest Windows, so ACPI timer
interrupt is raised only twice.  My solution is that tmr_overflow_time is
updated every time after setting expired_time. I tested it on Windows XP,
not sure on other guest OS .

acpi.patch:

--- qemu.orig/hw/acpi.c	Wed Dec 12 22:12:56 2007
+++ qemu/hw/acpi.c	Wed Dec 12 22:14:00 2007
@@ -102,6 +102,7 @@ static void pm_update_sci(PIIX4PMState *
     if ((s->pmen & TMROF_EN) && !(pmsts & TMROF_EN)) {
         expire_time = muldiv64(s->tmr_overflow_time, ticks_per_sec,
PM_FREQ);
         qemu_mod_timer(s->tmr_timer, expire_time);
+	s->tmr_overflow_time+=0x800000LL;
     } else {
         qemu_del_timer(s->tmr_timer);
     }


http://www.nabble.com/file/p14296430/acpi.patch acpi.patch 
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