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Re: [qemu-s390x] [PATCH 1/3] vfio-ccw: add capabilities chain

From: Pierre Morel
Subject: Re: [qemu-s390x] [PATCH 1/3] vfio-ccw: add capabilities chain
Date: Fri, 23 Nov 2018 13:28:25 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.2.1

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 <address@hidden>
  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 ?


Pierre Morel
Linux/KVM/QEMU in Böblingen - Germany

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