disk=['file://..xvda'] not working for boot disks anymore?

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

Hey,

This parameter
disk = ['file:/root/sol.dd,xvda,w','file:/root/sol-11_2_15_5_1-text-x86.iso,xvdb:cdrom,r']

works with qemu-traditional, but if I try with qemu-xen it
does not find the disk:

(d15) [2016-01-22 20:50:03] enter handle_19:
(d15) [2016-01-22 20:50:03]   NULL
(d15) [2016-01-22 20:50:03] Booting from ROM...
(d15) [2016-01-22 20:50:03] Booting from c980:0361

while with qemu-traditional:

(d14) [2016-01-22 20:43:15] Bochs BIOS - build: 06/23/99
(d14) [2016-01-22 20:43:15] $Revision: 1.221 $ $Date: 2008/12/07 17:32:29 $
(d14) [2016-01-22 20:43:15] Options: apmbios pcibios eltorito PMM
(d14) [2016-01-22 20:43:15]
(d14) [2016-01-22 20:43:15] ata0 master: QEMU HARDDISK ATA-7 Hard-Disk (12288 MBytes)
(d14) [2016-01-22 20:43:15]
(d14) [2016-01-22 20:43:15]
(d14) [2016-01-22 20:43:15]
(d14) [2016-01-22 20:43:15] Press F12 for boot menu.
(d14) [2016-01-22 20:43:15]
(d14) [2016-01-22 20:43:15] Booting from Hard Disk...

It does work with Xen 4.4, but that is ancient. I hadn't yet
tried Xen 4.5 nor 4.6.

I am hoping one of you knows exactly which commit might have made
this change?

Note that the name is 'xvda', not 'hda'. Thanks!