qemu-img vdi support

[bmwiedemann]

This patch is based on the patch from http://blogs.sun.com/VirtualGuru/entry/ ... vm_virtual and includes 2 minor compile fixes plus one update so that it now applies to the recent qemu-0.9.2svn20081008 (as shipped with OpenSUSE-11.1)
It should allow using the qemu-img tool to convert between VirtualBox Virtual Disk Image (VDI) files and all qemu image formats thus greatly enhancing compatibility between the two technologies.

http://lsmod.de/~bernhard/linux/qemu-img-vdi.patch

apply as usual with patch -p0

Ciao
Bernhard M.

[bmwiedemann]

I updated the patch to fix a small bug in VDI_probe and change the "VDI" format string to lower-case when I was at it.
Also I found out, that this patch allows qemu and KVM to directly access VirtualBox Disk Images natively - i.e. just run the OS within.

[bmwiedemann]

more recent versions of qemu (I used kvm-87) need a slightly different modification.
The main code all gets into block/vdi.c now:
http://lsmod.de/~bernhard/linux/vdi.c
and the Makefile needs to list block/vdi.o right next to block/vmdk.o
There is probably some way to let configure put it there. Anyone knows?