Bug#782145: jessie failing on xenserver netboot

Package: installation-reports

Boot method: network
Image version: http://ftp.nl.debian.org/debian/dists/testing/main/installer-amd64/current/images/netboot/netboot.tar.gz
Date: 8.4.2015

Machine: xenserver
Processor:
Memory:
Partitions: NA

Output of lspci -knn (or lspci -nn):

Base System Installation Checklist:
[E] = Error (please elaborate below)

Initial boot:           [O]
Detect network card:    [O ]
Configure network:      [ O]
Detect CD:              [O ]
Load installer modules: [O ]
Detect hard drives:     [E ]
Partition hard drives: [ ]
Install base system:    [ ]
Clock/timezone setup:   [ ]
User/password setup:    [ ]
Install tasks:          [ ]
Install boot loader:    [ ]
Overall install:        [ ]

Comments/Problems:
I am trying to install via netboot jessie on xenserver, but this is failing with error:
"No root files system is defined".

I believe the problem is that initrd.gz doesn't contain necessary kernel modules for xvd? disks (xenserver virtual disk, eg. xvda), so this disk is not recognized during installation and failing partitioning.

I think the missing one is xen-blk

This might be relevant, if not duplicate:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=637784