On 08/16/2013 08:43 PM, Konrad Rzeszutek Wilk wrote:
> On Fri, Aug 16, 2013 at 04:10:56PM +0800, Vaughan Cao wrote:
>> kernel use callback linked in panic_notifier_list to notice others when panic
>> happens.
>> NORET_TYPE void panic(const char * fmt, ...){
>> ...
>> atomic_notifier_call_chain(&panic_notifier_list, 0, buf);
>> }
>> When xen aware this, it will call xen_reboot(SHUTDOWN_crash) to send out an
> ^^^^^^^^^^^^^^^^^^^-> "When Xen becomes aware of this"
>
>> event with reason code - SHUTDOWN_crash.
>> xen_panic_handler_init() is defined to register on panic_notifier_list but
>> we only call it in xen_arch_setup which only be called by pvm, this patch is
> ^^^^^^^-> "is only"
>> necessary for pvhvm.
> Could you tell me what has been happening without this patch?
Setting 'on_crash=coredump-restart' in PVHVM guest config file can't
lead a vmcore to be generate when the guest panics. It can be reproduced
with 'echo c > /proc/sysrq-trigger'.
>From the xend.log, we find the reason code gotten by dominfo is not as
expected:
[2013-07-29 08:55:37 19378] INFO (XendDomainInfo:2148) Domain has
shutdown: name=oakDom1 id=15 reason=reboot.
While log from a guest who can capture the crash is as below:
[2013-07-29 08:13:42 19378] WARNING (XendDomainInfo:2131) Domain has
crashed: name=oakDom1 id=14.
Thanks,
Vaughan
>
> Thank you.
>
>> Signed-off-by: Vaughan Cao <vaughan.cao@xxxxxxxxxx>
>> ---
>> arch/x86/xen/enlighten.c | 2 ++
>> 1 file changed, 2 insertions(+)
>>
>> diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
>> index 4aec5ed..53e5726 100644
>> --- a/arch/x86/xen/enlighten.c
>> +++ b/arch/x86/xen/enlighten.c
>> @@ -1713,6 +1713,8 @@ static void __init xen_hvm_guest_init(void)
>>
>> xen_hvm_init_shared_info();
>>
>> + xen_panic_handler_init();
>> +
>> if (xen_feature(XENFEAT_hvm_callback_vector))
>> xen_have_vector_callback = 1;
>> xen_hvm_smp_init();
>> --
>> 1.7.11.7
>>
_______________________________________________
Virtualization mailing list
Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx
https://lists.linuxfoundation.org/mailman/listinfo/virtualization
