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[PATCH v3 0/1] virtio-ccw: Revision handling (VIRTIO-42)
On Tue, 05 Nov 2013 16:59:19 +1030
Rusty Russell <[email protected]> wrote:
> Cornelia Huck <[email protected]> writes:
>
> Provide a new ccw that allows devices and drivers to operate on selected
>
> revision levels.
> >
>
> VIRTIO-42
> >
>
> Signed-off-by: Cornelia Huck <[email protected]>
> >
> > ---
> >
>
> 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.
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