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Re: [libvirt] [libvirt PATCH] Port-profile ID support using IFLA_VF_PORT_PROFILE netlink msg



On Wed, May 12, 2010 at 10:06:34AM -0400, Stefan Berger wrote:
> "Daniel P. Berrange" <berrange redhat com> wrote on 05/12/2010 08:48:58 
> AM:
> 
> > 
> > On Sat, May 08, 2010 at 10:13:36PM -0400, Stefan Berger wrote:
> > > Scott Feldman <scofeldm cisco com> wrote on 05/08/2010 07:28:11 PM:
> > > 
> > > >     VSI Manager ID      1 octet
> > > >     VSI Type ID         3 octets
> > > >     VSI Type ID Version 1 octet
> > > >     VSI Instance ID    16 octets              <-- taken care of via 
> > > dimdecode
> > 
> > The code can't rely on using dmidecode I'm afraid. Far too many
> > manufacturers / machines have SMBIOS UUID field filled with complete
> > garbage. eg my main server shows
> > 
> >   # dmidecode |grep -i uuid
> >    UUID: Not Settable
> > 
> > So if we need a host UUID, I think we need to be able to either set it 
> in
> > the XML, or have it set in a per host config for the QEMU driver in 
> libvirt.
> 
> I wouldn't make it QEMU specific. It should probably go into libvirt.conf, 
> but
> then libvirt.conf would need to be modified on every machine when 
> installed.
> How should the code react if no valid UUID is found in the config file?
> Create a temporary one that changes with every restart of libvirt? Also 
> dmidecode
> should probably be used on those machine where it returns a valid UUID.

How do we decide that dmidecode is showing a valid UUID though. Is a
UUID of all 0's, all 1's or all F's valid ? 

> Once that would be done, we could show the UUID via 'virsh capabilities'
> so management software can find it.

Agree, it would be useful to expose a host UUID in the capabilities.

Daniel
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