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

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

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 ?

Ian.

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