It seems that I’m not the only person getting this error with existing qcow2 images:
Header extension too large
The good news, is that if you have any way to build your own Qemu its a trivial thing to uh “fix”. Now I haven’t done that much in the way of testing, maybe there is something fundamentally wrong with Qcows created from older versions of Qemu but the error comes from HERE.
You could just comment out the “return -EINVAL;” and Qemu will continue on its merry little way.
Now I’ve tried converting my qcow2’s to other formats with 0.14 but they all have slight errors that wind up preventing OS/2 from booting (I know that 99% of the would wouldn’t care..).
I’m not sure what to make of it, but it looks like to me, that if you really really want this version its best to remove that check so you can keep your old disk images.. try converting them, but.. they may not work `exactly` right.. TEST…!!!