[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] [PATCH] bugfix: vm halt when in reset looping
From: |
Hangaohuai |
Subject: |
Re: [Qemu-devel] [PATCH] bugfix: vm halt when in reset looping |
Date: |
Wed, 14 Dec 2016 13:04:37 +0000 |
Thanks for the review and proposals .
I will think over the suspend and resume of VM.
On 14/12/2016 07:48, hangaohuai wrote:
> 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>
I think this would break S3 resume.
Paolo
> ---
> hw/timer/mc146818rtc.c | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/hw/timer/mc146818rtc.c b/hw/timer/mc146818rtc.c index
> da209d0..67d707d 100644
> --- a/hw/timer/mc146818rtc.c
> +++ b/hw/timer/mc146818rtc.c
> @@ -946,11 +946,19 @@ static Property mc146818rtc_properties[] = {
> DEFINE_PROP_END_OF_LIST(),
> };
>
> +static void rtc_resetdev(DeviceState *d) {
> + RTCState *s = MC146818_RTC(d);
> +
> + 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() */
>