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[libvirt] Re: [PATCH 0/12] Standardized device addressing & SCSI controller/disk hotplug



On Tue, Dec 15, 2009 at 04:53:24PM +0100, Wolfgang Mauerer wrote:
> Daniel P. Berrange wrote:
> > On Tue, Dec 15, 2009 at 01:06:51PM +0100, Wolfgang Mauerer wrote:
> >> Hi,
> >>
> >> Daniel P. Berrange wrote:
> >>> This patch series is a combination of series done by
> >>> Wolfgang Mauerer to support proper SCSI drive hotplug
> >>> and new work by myself to introduce generic addressing
> >>> for all devices.
> >>>
> >>> Wolfgang's most recent posting was
> >>>
> >>> http://www.redhat.com/archives/libvir-list/2009-November/msg00574.html
> >>> http://www.redhat.com/archives/libvir-list/2009-November/msg00701.html
> >>>
> >>> When testing that series I came across a few minor issues,
> >>> but more importantly it made me realize how important it is
> >>> that we introduce explicit device addressing in our XML format.
> >>> (...)
> >> essentially, this all looks good to me - thanks for the extensions.
> >> Unfortunately, I was not yet successful in fully testing the code
> >> because I have some issues with the underlying qemu that prevent my
> >> machines from booting correctly with recent qemu-kvms. However, I came
> >> across a small issue: When certain PCI devices are not present in the
> >> system, libvirt can crash at startup. The attached patch fixes this.
> > 
> > Hmm, which particular device did you see it crash on? These
> > functions are only called with 'def' straight out of the
> > virDomainDefPtr struct, (eg, vm->def->disks[INDEX]) and those
> > are all supposed to be non-NULL at all times. So if one is NULL
> > then I've introduced a bug somewhere else ! I guess most likely
> > in the new controllers code.
> 
> it crashed with a missing watchdog. I realise that the other
> checks are not strictly necessary when users stick to the calling
> conventions, but figured that one check too many in the startup phase
> doesn't do any harm and is better than a crash.

Ah, thanks for that. I'll include your patch anyway

Daniel
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