On Tue, 05 Nov 2013 16:59:19 +1030
Rusty Russell <> wrote:
> Cornelia Huck <> writes:
> > Provide a new ccw that allows devices and drivers to operate on selected
> > revision levels.
> >
> > VIRTIO-42
> >
> > Signed-off-by: Cornelia Huck <>
> >
> > ---
> >
> > Changes v2 -> v3:
> > - Reset will not clear the revision; instead, the revision is cleared
> > when the subchannel is disabled
>
> Does this work properly across kexec scenarios?
Kexec on s390 will do a diagnose (hypercall) that triggers (among other
things) a channel subsystem reset, which in turn includes disabling all
subchannels. This means the kexeced guest will be presented with an
unset revision.
>
> Cheers,
> Rusty.
