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

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

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.

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