[PATCH 0/3] vfio-ccw: support hsch/csch (kernel part)

Cornelia Huck
2018-11-22T16:54:29Z

[This is the Linux kernel part, git tree is available at
https://git.kernel.org/pub/scm/linux/kernel/git/kvms390/vfio-ccw.git vfio-ccw-caps

The companion QEMU patches are available at
https://github.com/cohuck/qemu vfio-ccw-caps]

Currently, vfio-ccw only relays START SUBCHANNEL requests to the real
device. This tends to work well for the most common 'good path' scenarios;
however, as we emulate {HALT,CLEAR} SUBCHANNEL in QEMU, things like
clearing pending requests at the device is currently not supported.
This may be a problem for e.g. error recovery.

This patch series introduces capabilities (similar to what vfio-pci uses)
and exposes a new async region for handling hsch/csch.

Very lightly tested (I can interact with a dasd as before; I have not
found a reliable way to trigger hsch/csch in the Linux dasd guest driver.)

Cornelia Huck (3):
vfio-ccw: add capabilities chain
s390/cio: export hsch to modules
vfio-ccw: add handling for asnyc channel instructions

drivers/s390/cio/Makefile | 3 +-
drivers/s390/cio/ioasm.c | 1 +
drivers/s390/cio/vfio_ccw_async.c | 88 +++++++++++++
drivers/s390/cio/vfio_ccw_drv.c | 48 +++++--
drivers/s390/cio/vfio_ccw_fsm.c | 158 +++++++++++++++++++++-
drivers/s390/cio/vfio_ccw_ops.c | 195 ++++++++++++++++++++++++----
drivers/s390/cio/vfio_ccw_private.h | 44 +++++++
include/uapi/linux/vfio.h | 5 +
include/uapi/linux/vfio_ccw.h | 12 ++
9 files changed, 509 insertions(+), 45 deletions(-)
create mode 100644 drivers/s390/cio/vfio_ccw_async.c

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2.17.2