linux-kernel - [PATCH RFC 0/2] vfio-ccw: exploit halt/clear subchannel support

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Message-Id: <20180509154910.23578-1-cohuck@redhat.com>
Date:   Wed,  9 May 2018 17:49:08 +0200
From:   Cornelia Huck <cohuck@...hat.com>
To:     Dong Jia Shi <bjsdjshi@...ux.ibm.com>,
        Halil Pasic <pasic@...ux.ibm.com>,
        Pierre Morel <pmorel@...ux.ibm.com>
Cc:     linux-s390@...r.kernel.org, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, qemu-s390x@...gnu.org,
        qemu-devel@...gnu.org, Cornelia Huck <cohuck@...hat.com>
Subject: [PATCH RFC 0/2] vfio-ccw: exploit halt/clear subchannel support

Hi,

this is the QEMU companion patchset to "vfio-ccw: support for {halt,clear}
subchannel", but is interface-wise independent of it.

With an old host kernel, things should work as before. With a new host
kernel, guest halt/clear requests should get passed through to the host.

I tested this with a hacked-up guest kernel to issue clears on demand.

Cornelia Huck (2):
  vfio-ccw: forward halt/clear to device if supported
  s390/css: add some tracing for pass-through handling

 hw/s390x/css.c         | 38 ++++++++++++++++++++++++++++++++++----
 hw/s390x/trace-events  |  4 ++++
 hw/vfio/ccw.c          | 11 +++++++++--
 include/hw/s390x/css.h | 10 +++++++---
 4 files changed, 54 insertions(+), 9 deletions(-)

-- 
2.14.3