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RE: [Xen-devel] domains not shutting down properly-theproblemisbackagain


  • To: "James Harper" <james.harper@xxxxxxxxxxxxxxxx>, "Keir Fraser" <keir.fraser@xxxxxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: "James Harper" <james.harper@xxxxxxxxxxxxxxxx>
  • Date: Sat, 3 Jan 2009 16:36:01 +1100
  • Cc:
  • Delivery-date: Fri, 02 Jan 2009 21:36:34 -0800
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AclsEUiDJwnrGfQLQ6G5Bsw4GM+wzgAAL2RgAAIdJkkAHEzXYAAA9a8QAAD1UUAACaHcAAABmirxAAEexXAAAH2McAAAGpUAAAH94BAAAdTsvgABrLdgAASGj2IAHHluQAAA9upQ
  • Thread-topic: [Xen-devel] domains not shutting down properly-theproblemisbackagain

> > Perhaps multiprocessor dom0, plus a bug in the dom0 kernel which
means
> > that
> > the VCPU which Xen notifies for the virq is not the one which dom0
> kernel
> > is
> > expecting to receive the notification to? What do you use as dom0
> kernel?
> >
> 
> That appears to be the problem.
> 
> 1. xenstore starts up and binds VIRQ_DOM_EXC to port 18
> 2. xend starts and sets the number of cpus to 1 (dom0-cpus = 1)
> 3. xen notifies xenstore on port=18, vcpu=1, but vcpu 1 doesn't exist
> anymore so the event never gets anywhere
> 
> The curious thing is that IOCTL_EVTCHN_BIND_VIRQ explicitly sets vcpu
=
> 0, so why is the event getting delivered to vcpu 1???
> 

Something is making a call to evtchn_bind_vcpu...

James

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