Re: [PATCH 1/3] vfio-ccw: add capabilities chain

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On 22/11/2018 17:54, Cornelia Huck wrote:
Allow to extend the regions used by vfio-ccw. The first user will be
handling of halt and clear subchannel.

Signed-off-by: Cornelia Huck <cohuck@xxxxxxxxxx>
---
  drivers/s390/cio/vfio_ccw_ops.c     | 182 ++++++++++++++++++++++++----
  drivers/s390/cio/vfio_ccw_private.h |  38 ++++++
  include/uapi/linux/vfio.h           |   1 +
  3 files changed, 195 insertions(+), 26 deletions(-)


Halt and clear have no parameters (the sub-channel ID is obviously the one of the mediated device).

Isn't adding a new sub-region for the purpose of handling halt and clear superfluous?

What is the reason not to use simple ioctls ?

Regards,
Pierre

--
Pierre Morel
Linux/KVM/QEMU in Böblingen - Germany




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