[PATCH RFC 0/2] vfio-ccw: support for {halt,clear} subchannel

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Hi,

this (RFC) is an initial stab at passing the halt and clear subchannel
operations to the host device. Today, host userspace is emulating
those two operations, but we really want to execute them on the host
device (e.g. for error recovery situations).

The nice thing about this approach is that is independent from userspace
changes: Unless userspace forwards halt/clear requests, we behave as
before. Conversely, userspace can simply try to submit halt/clear, and
old kernels will simply indicate that it is not supported.

This survives triggering clear subchannel in the guest (hacked in by
myself) together with an update QEMU (to be posted in a moment).

Obviously, this needs some more work. Better support for async handling
comes to mind. We probably also want to support other channel I/O
instructions.

Cornelia Huck (2):
  s390/cio: export hsch to modules
  vfio-ccw: support for halt/clear subchannel

 drivers/s390/cio/ioasm.c        |  1 +
 drivers/s390/cio/vfio_ccw_drv.c | 10 ++++-
 drivers/s390/cio/vfio_ccw_fsm.c | 94 ++++++++++++++++++++++++++++++++++++-----
 3 files changed, 93 insertions(+), 12 deletions(-)

-- 
2.14.3

--
To unsubscribe from this list: send the line "unsubscribe linux-s390" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html



[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Index of Archives]     [Kernel Development]     [Kernel Newbies]     [IDE]     [Security]     [Git]     [Netfilter]     [Bugtraq]     [Yosemite Info]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Linux ATA RAID]     [Samba]     [Linux Media]     [Device Mapper]

  Powered by Linux