On Mon, Oct 11, 2010 at 05:39:01PM +0200, Avi Kivity wrote:
On 10/11/2010 05:30 PM, Stefan Hajnoczi wrote:
It was discussed before, but I don't think we came to a conclusion. Are
there any circumstances under which you don't want to set the
QED_CF_BACKING_FORMAT flag?
I suggest the following:
QED_CF_BACKING_FORMAT_RAW = 0x1
When set, the backing file is a raw image and should not be probed for
its file format. The default (unset) means that the backing image file
format may be probed.
Now the backing_fmt_{offset,size} are no longer necessary.
Should it not be an incompatible option? If the backing disk starts
with a format magic, it will be probed by an older qemu,
incorrectly.
Agreed, it should be a non-compat feature bit.