On Mon, 18 Nov 2019 19:13:34 +0100 Cornelia Huck <coh...@redhat.com> wrote:
> > EIO is returned by vfio-ccw mediated device when the backing > > host subchannel is not operational anymore. So return cc=3 > > back to the guest, rather than returning a unit check. > > This way the guest can take appropriate action such as > > issue an 'stsch'. > > Hnm, I'm trying to recall whether that was actually a conscious choice, > but I can't quite remember... the change does make sense at a glance, > however. Is EIO returned if and only if the host subchannel/device is not operational any more, or are there cases as well? Is the mapping (cc to condition) documented? By the QEMU code I would think that we already have ENODEV and EACCESS for 'not operational' -- no idea why we need two codes though. Regards, Halil
