Re: [Qemu-devel] [PATCH v5 7/9] block: don't make snapshots for filters

["Pavel Dovgalyuk" <dovgaluk@ispras.ru>]

Kevin,

> From: Kevin Wolf [mailto:kwolf@redhat.com]
> Am 05.12.2016 um 12:49 hat Pavel Dovgalyuk geschrieben:
> > > From: Kevin Wolf [mailto:kwolf@redhat.com]
> >
> > It's not a requirement. But to make replay deterministic we have to
> > start with the same image every time. As I know, this may be achieved by:
> > 1. Restoring original disk image manually
> > 2. Using vm snapshot to start execution from
> > 3. Using -snapshot option
> > 4. Not using disks at all
> >
> > > Because if it has to be
> > > there, the next step could be that blkreplay creates temporary-overlay
> > > internally in its .bdrv_open().
> >
> > Here is your answer about such an approach :)
> > https://lists.gnu.org/archive/html/qemu-devel/2016-09/msg04687.html
> 
> Right, and unfortunately these are still good points.
> 
> Especially the part where you allowed to give the overlay filename
> really needs to work the way it does now with the 'image' option. We
> might not need to be that strict with temporary overlays, restricting to
> qcow2 with default options could be acceptable there - but whatever I
> think of to support both cases results in something that isn't really
> easier than the manual way that we figured out above.

What about the new version?

Pavel Dovgalyuk