On Wed, Feb 15, 2017 at 12:11:12PM +0100, Juergen Gross wrote:
> Specifying an empty cdrom device will result in a Xenstore entry
> params = aio:(null)
> as the physical device path isn't existing. This lets a domain booted
> via OVMF hang as OVMF is checking for "aio:" only in order to detect
> the empty cdrom case.
> Use an empty string for the physical device path in this case. As a
> cdrom device for HVM is always backed by qdisk we only need to cover this
> backend.
> Signed-off-by: Juergen Gross <jgr...@suse.com>
> ---

Acked + applied

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