Re: [Xen-devel] problem about changing state to XenbusStateClosed resulting in vbd entry removed from xenstore

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 19 May 2006, at 00:00, Ewan Mellor wrote:

> > + This doesn't seem correct since vbd's are created and destroyed from
> > Dom0 as part of domain creation 'xm create' or explicitly by executing
> > 'xm block-attach'. Therefore, it would seem that devices should be
> > removed either when a domU terminates or the device is explicitly
> > removed from dom0 by 'xm block-detach'.
> You could argue that you ought to be able to remove the frontend driver
> module, and then load that module again and have all the devices 
> reconnect.
> I've no idea whether that would have knock-on consequences though.
I think we really ought to be able to support this, but it hardly 
sounds a priority. OTOH if it's simply a case of stopping the hotplug 
scripts from zapping the xenstore entries, and instead do that in the 
domain-destruction and vbd-remove paths of xend, then maybe it's not so 
hard to fix. Anyway, I'd certainly consider the current behaviour to be 
a bug, albeit perhaps a minor one.
 -- Keir


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