Re: [Qemu-devel] VHD suport in QEMU?

[Stefan Hajnoczi]

On Fri, Nov 01, 2013 at 06:04:19AM +0100, Philipp Hahn wrote:
> sorry for high-jacking this thread, but I have a questing regarding VHD 
> (without the X): Xen-4.3 switched to upstream QEMUs support for VHD. The 
> dropped their own VHD implementation in blktap2, which supported backing 
> chains, which QEMU currently doesn't. The Xen implementation 
> (xen/tools/blktap2/vhd/lib/ is BSD 3 clause) also supports some kind of 
> journal.
> 1. Does someone know if the journal support for VHD is somehow related to 
> VHDX?
> 2. Has somewone put some work into supporting backing chains? I started to 
> have a look myself some time ago, but had to do other work since then.

Hi Philipp,
I'm not aware of block/vpc.c (classic VHD) improvements at this time.

Out of interest, are the VHD Differencing images you'd like to use come
from Xen, VirtualPC, or something else?

Stefan