Re: [Xen-devel] [PATCH] libxl: No emulated disk driver for xvdX disk

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

On 10/27/2015 09:19 AM, Ian Jackson wrote:
> George Dunlap writes ("Re: [Xen-devel] [PATCH] libxl: No emulated disk driver for 
> xvdX disk"):
> > On Tue, Oct 27, 2015 at 11:11 AM, Stefano Stabellini
> > <stefano.stabellini@xxxxxxxxxxxxx> wrote:
> > > The guest can access xvdX disks via the PV block protocol, or via
> > > UEFI firmare using EFI BootServices.
> > But it introduces a sort of regression in some setups -- namely,
> > before you could use exactly the same disk and config file for either
> > a PV or HVM guest, simply adding builder=hvm (either to the file or
> > the command line) to switch between the two.
> The purpose of the `vdev' in the xl disk specification is to say how
> the disk should be presented to the guest.
>
> Did you look at docs/misc/vbd-interface.txt ?
>
> If you want something that is accessible via the BIOS etc. in HVM
> guests, why not use vdev=hda rather than vdev=xvda ?
Yes, but since we've discovered that people do use xvda (and have been 
doing this for long time --- our test framework has been running for 
many years configured like that) --- do we want this to suddenly break?
-boris

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