Here are the remaining patches in my fixes series, to handle the more involved scenario of channel programs that do not move any actual data to/from the device. They were reordered per feedback from v2, which means they received minor massaging because of overlapping code and some cleanup to the commit messages. They are based on Conny's vfio-ccw tree. :) Changelog: v2 -> v3: - Patches 1-4: - [Farhan] Added r-b - [Cornelia] Queued to vfio-ccw, dropped from this version - Patches 5/6: - [Cornelia/Farhan] Swapped the order of these patches, minor rework on the placement of bytes/idaw_nr variables and the commit messages that resulted. v2: https://patchwork.kernel.org/cover/10944075/ v1: https://patchwork.kernel.org/cover/10928799/ Eric Farman (3): s390/cio: Don't pin vfio pages for empty transfers s390/cio: Allow zero-length CCWs in vfio-ccw s390/cio: Remove vfio-ccw checks of command codes drivers/s390/cio/vfio_ccw_cp.c | 92 ++++++++++++++++++++++++---------- 1 file changed, 65 insertions(+), 27 deletions(-) -- 2.17.1