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Re: [libvirt] [Xen-devel] [PATCH] libxl: support domainReset



On Tue, Aug 05, 2014 at 04:30:47PM +0100, Ian Campbell wrote:
> On Tue, 2014-08-05 at 09:10 -0600, Jim Fehlig wrote:
> > Ian Campbell wrote:
> > > On Tue, 2014-08-05 at 08:06 -0600, Jim Fehlig wrote:
> > >   
> > >> Ian Campbell wrote:
> > >>     
> > >>> On Tue, 2014-08-05 at 10:55 +0200, Olaf Hering wrote:
> > >>>   
> > >>>       
> > >>>> The original report was that 'Reset' does not work from GUI, like
> > >>>> virt-manager or virsh. I think the expected outcome is like pushing the
> > >>>> reset button on a physical board. Xen doesnt do it that way, no idea
> > >>>> about others.
> > >>>>     
> > >>>>         
> > >>> Sounds like you want libxl_domain_reboot then, perhaps with a fallback
> > >>> on ERROR_NOPARAVIRT for an HVM guest to sending a trigger.
> > >>>   
> > >>>       
> > >> Hrm, I don't think that's right .  It should be a hard reset
> > >>
> > >> http://libvirt.org/html/libvirt-libvirt.html#virDomainReset
> > >>
> > >> destroy/start seems the correct way to implement this.
> > >>     
> > >
> > > Yes, given that requirement it is. Sorry for the noise.
> > >
> > > Would some sort of hard reset API be useful in libxl?
> > >   
> > 
> > Sure.  I think having an API that emulates a power reset button would be
> > a nice addition to libxl's domain operations.  The destroy/start
> > approach incurs a small bit of overhead, which would be avoided with
> > such an API.  Clients (perhaps incorrectly) implementing their own
> > notion of reset  would also be avoided.
> 
> I think this ought to become pretty easy once Wei's patches to record
> the guest cfg in libxl are completed. Wei -- what do you think?
> 

I don't think this "reset" API will need to record any state, i.e. this
feature looks unrelated to my work. What do I miss?

Wei.


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