Re: [Xen-devel] xen_emul_unplug on xen 4.1, HVM guest 2.6.38

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Thu, 27 Oct 2011, Stefan Bader wrote:
> On 27.10.2011 15:42, Stefano Stabellini wrote:
> > I take we are still talking about PV on HVM guests here.
> > 
> > On Thu, 27 Oct 2011, Stefan Bader wrote:
> >> At least one part is not Ubuntu specific. And that is that the unplug logic
> >> decides to unplug emulated devices based on having the pci and the blkfront
> >> driver *available* (built-in or module). But later on the blkfront driver
> >> ignores all devices that are not *named* in a way to map to the xvd major.
> >> Which leaves you without any usable devices when you named your disk hda in
> >> the config file and you do not prevent unplugging.
> > 
> > If you name your disk hda (as you should), blkfront is going to create
> > /dev/xvda in your guest.
> > It is not ignoring your disk, it just using "xvd" to name the device in
> > the guest.
> > 
> > 
> >> Still I would love to see this unplug handling become a bit more obvious. 
> >> If
> >> unplug was successful, then blkfront should not ignore the devices. Or 
> >> maybe
> >> just make the config more what-you-write-is-what-you-get and having hd or 
> >> sd
> >> there only gives you emulated devices and xvd gives you pv devices.
> > 
> > Yes, if the unplug is unsuccessful blkfront should not ignore the
> > device: it is going to create a /dev/xvd* for you.
> 
> Hm, did you mean unsuccessful? Because then I think it *should* ignore the pv
> disk. If it was successful then it *should not*. Or am I understanding this 
> wrong?

Yes, sorry for the misspell.
If the unplug is successful then it should not ignore the disk.

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