Re: [Qemu-devel] Re: KVM call minutes for June 8

[Anthony Liguori <anthony@codemonkey.ws>]

On 06/09/2010 10:18 AM, Luiz Capitulino wrote:
>> The big problem is things like the block io error events.  I don't see
>> how we can support that given what we have in 0.13.  Putting errno on
>> the wire is a bad idea.  We need to marshal a QError object using the
>> __class__ memory to identify it as QError and pass that with the event.
>> It could potentially be made to work for 0.13 but it'll be ugly.
>>      
>   Yes, that's the main problem of the whole thing I think.
>
>   From QEMU pov, the best thing to do would be to let this event as it's
> today and wait for the new QError (it's a compatible change, anyway).
>    

I'd prefer that we just send the event with an embedded qerror (using 
__class__).  We can generate it directly instead of using 
qerror_report/qerror_new.  It's ugly but it'll work and be future 
compatible.  For now, let's just support a few types of qerror to 
basically distinguish between an unknown io error and ENOSPC.

>   However, libvirt was counting on this feature and on the snapshot commands
> to switch from the text Monitor. We have two options:
>    

I don't think snapshots are actually usable by libvirt in the current form.

Regards,

Anthony LIguori

>   1. Ask them to wait one more release (not so good for us)
>   2. Try to find a way to have those features in for 0.13
>
>   Daniel has commented to me that making the snapshot commands synchronous
> for 0.13 wouldn't be that bad, what do you think?
>