Re: [PATCH REPOST v2 0/3] Add callback mech for qemu and nodedev

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On Wed, Feb 22, 2017 at 03:13:05PM +0100, Paolo Bonzini wrote:
> 
> 
> On 22/02/2017 15:11, Daniel P. Berrange wrote:
> > On Wed, Feb 22, 2017 at 03:10:00PM +0100, Paolo Bonzini wrote:
> >>
> >>
> >> On 22/02/2017 14:46, Daniel P. Berrange wrote:
> >>> On Wed, Feb 22, 2017 at 02:38:32PM +0100, Paolo Bonzini wrote:
> >>>>
> >>>>
> >>>> On 22/02/2017 11:05, Daniel P. Berrange wrote:
> >>>>> I'd also suggest just assigning the whole vHBA
> >>>>
> >>>> What do you mean by "assigning the whole vHBA"?  There is no concept of
> >>>> a vHBA as e.g. a PCI virtual function.
> >>>
> >>> I thought we had a generic SCSI passthrough capability that could
> >>> attach to the SCSI vHBA in the host, or am I mis-remembering ?
> >>
> >> No, the SCSI passthrough capability attaches to a single device.
> >>
> >> With Fibre Channel, zoning allows you to configure the set of visible
> >> disks for each machine (or more accurately for each WWPN and/or WWNN) at
> >> the storage fabric level.  So the idea is to just configure the
> >> WWPN/WWNN and let libvirt handle the discovery of disks underneath.  The
> >> alternative is to do it in both oVirt and Nova though, as mentioned
> >> elsewhere in the thread, libvirt could still provide a udev wrapper.
> > 
> > What do you mean by "provide a udev wrapper" ?
> 
> Expose udev events in a way that is friendly to someone who is consuming
> the nodedev API.

We've got that support already. Apps can register to receive events
whenever a virNodeDevice is added or removed from a host, as well as
if its config changes.  

Regards,
Daniel
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