Re: Configuration vs. compat hints [was Re: [Qemu-devel] [PATCHv3 03/13] qemu: add routines to manage PCI capabilities]

[Jamie Lokier]

Avi Kivity wrote:
> On 06/16/2009 09:32 PM, Jamie Lokier wrote:
> >Avi Kivity wrote:
> >   
> >>Another issue is enumeration.  Guests will present their devices in the
> >>order they find them on the pci bus (of course enumeration is guest
> >>specific).  So if I have 2 virtio controllers the only way I can
> >>distinguish between them is using their pci slots.
> >
> >virtio controllers really should have a user-suppliable string or UUID
> >to identify them to the guest.  Don't they?
> 
> virtio controllers don't exist.  When they do, they may have a UUID or 
> not, but in either case guest infrastructure is in place for reporting 
> the PCI slot, not the UUID.
> 
> virtio disks do have a UUID.  I don't think older versions of Windows 
> will use it though, so if you reorder your slots you'll see your drive 
> letters change.  Same with Linux if you don't use udev by-uuid rules.

I guess I meant virtio disks, so that's ok.

-- Jamie