linux-kernel - [PATCH v2 0/1] vfio-ccw: Enable transparent CCW IPL from DASD

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Date:   Thu, 30 Apr 2020 17:29:58 -0400
From:   Jared Rossi <jrossi@...ux.ibm.com>
To:     Eric Farman <farman@...ux.ibm.com>,
        Cornelia Huck <cohuck@...hat.com>,
        Halil Pasic <pasic@...ux.ibm.com>
Cc:     linux-s390@...r.kernel.org, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 0/1] vfio-ccw: Enable transparent CCW IPL from DASD

Remove the explicit prefetch check when using vfio-ccw devices.
This check is not needed in practice as all Linux channel programs
are intended to use prefetch.

Version 2 improves logging by issuing a warning if a non-prefetch
ORB is encountered. A kernel warning is printed when an ORB without
the p-bit set is initialized.  The warning is limited to once per
five seconds because, if encountered, non-prefetch ORBs tend to
appear in bursts of hundreds per second.

The commit message is expanded to highlight the potential for
future risk if non-prefetch dependent channel programs become
prevalent.  Furthermore, a note of prefetch only support is
added to the limitations section of the vfio-ccw.rst.

Jared Rossi (1):
  vfio-ccw: Enable transparent CCW IPL from DASD

 Documentation/s390/vfio-ccw.rst |  4 ++++
 drivers/s390/cio/vfio_ccw_cp.c  | 16 +++++++---------
 2 files changed, 11 insertions(+), 9 deletions(-)

-- 
2.17.0