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

Jamie Lokier
2009-06-17T11:51:06Z

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