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[Qemu-devel] [PATCH v3] bugfix: vm halt when in reset looping
From: |
hangaohuai |
Subject: |
[Qemu-devel] [PATCH v3] bugfix: vm halt when in reset looping |
Date: |
Fri, 16 Dec 2016 16:23:22 +0800 |
reset mc146818rtc device when RESET event happens.
Fix the problem:
1. Guest boot the second cpu, set CMOS_RESET_CODE 0x0a to protect selfboot;
2. VM being reset by others, hmp_system_reset;
3. seabios resume check the CMOS_RESET_CODE, if 0x0a, jump to the BDA
resume execution by jump via 40h:0067h;
4. Guest halt;
Signed-off-by: hangaohuai <address@hidden>
---
hw/timer/mc146818rtc.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/hw/timer/mc146818rtc.c b/hw/timer/mc146818rtc.c
index da209d0..341b233 100644
--- a/hw/timer/mc146818rtc.c
+++ b/hw/timer/mc146818rtc.c
@@ -946,11 +946,22 @@ static Property mc146818rtc_properties[] = {
DEFINE_PROP_END_OF_LIST(),
};
+static void rtc_resetdev(DeviceState *d)
+{
+ RTCState *s = MC146818_RTC(d);
+
+ /* Reason: VM do suspend self will set 0xfe
+ * Only handle the VM boot case */
+ if (s->cmos_data[0x0f] == 0x0a)
+ s->cmos_data[0x0f] = 0x00;
+}
+
static void rtc_class_initfn(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->realize = rtc_realizefn;
+ dc->reset = rtc_resetdev;
dc->vmsd = &vmstate_rtc;
dc->props = mc146818rtc_properties;
/* Reason: needs to be wired up by rtc_init() */
--
1.8.3.1
- [Qemu-devel] [PATCH v3] bugfix: vm halt when in reset looping,
hangaohuai <=