On Wed, 6 May 2020 17:24:40 -0400 Jared Rossi <jrossi@xxxxxxxxxxxxx> wrote: > Remove the explicit prefetch check when using vfio-ccw devices. > This check does not trigger in practice as all Linux channel programs > are intended to use prefetch. > > It is expected that all ORBs issued by Linux will request prefetch. > Although non-prefetching ORBs are not rejected, they will prefetch > nonetheless. A warning is issued up to once per 5 seconds when a > forced prefetch occurs. > > A non-prefetch ORB does not necessarily result in an error, however > frequent encounters with non-prefetch ORBs indicate that channel > programs are being executed in a way that is inconsistent with what > the guest is requesting. While there is currently no known case of an > error caused by forced prefetch, it is possible in theory that forced > prefetch could result in an error if applied to a channel program that > is dependent on non-prefetch. > > Signed-off-by: Jared Rossi <jrossi@xxxxxxxxxxxxx> > --- > Documentation/s390/vfio-ccw.rst | 6 ++++++ > drivers/s390/cio/vfio_ccw_cp.c | 19 ++++++++++++------- > 2 files changed, 18 insertions(+), 7 deletions(-) > Thanks, applied.
