[libvirt] Crash state and QEMU

[Anthony Liguori]

On 05/10/2011 02:04 PM, Richard W.M. Jones wrote:
> On Tue, May 10, 2011 at 01:26:39PM -0500, Anthony Liguori wrote:
>> As far as I can tell, if QEMU exits abruptly or with a non-zero
>> status code, libvirt treats this as a domain destruction given no
>> real indication to the user that something bad happened.
>
> libvirtd raises an event.

But that event is no different than the event fired for a normal guest 
shutdown, no?

> There is (was?) a "reason" argument
> (eg. "reason" == "watchdog fired").  I've a vague recollection this
> was discussed but never added.  I can't find it in the code right now,
> but I might be looking for the wrong thing ...
>
>> But libvirt does have a crashed state for domains, it's just not
>> used for QEMU guests.
>
> I'll just make a historical note that the crashed state corresponded
> to a state in Xen.  Essentially the states in libvirt are directly
> mapped to the ones listed in the Xen xm man page here:
>
> http://linux.die.net/man/1/xm

I'm well aware of that :-)

That's why I asked whether not using the crash state was intentional (if 
it's deprecated as a general API).

Regards,

Anthony Liguori

>
>> I was wondering how intention of a design decision this was.  Right
>> now there's no good way for a management tool to detect a crashed
>> guest/QEMU.  Is there something I'm overlooking?
>
> Rich.
>