[Qemu-devel] [PATCH v3 0/2] s390x/vfio-ap: hot plug/unplug vfio-ap device

[Tony Krowiak <akrowiak@linux.ibm.com>]

This patch series introduces hot plug/unplug of a vfio-ap device.

To hot plug a vfio-ap device, the QEMU device_add function may be used:

   (qemu) device_add vfio-ap,sysfsdev=$path-to-mdev

   Where $path-to-mdev is the absolute path to the mediated matrix device
   to which AP resources to be used by the guest have been assigned.

   A vfio-ap device can be hot plugged only if:

   1. A vfio-ap device has not been attached to the ap-bus (only one is
      allowed per guest) either via the QEMU command line or a prior hot
      plug action.

   2. The guest was started with the CPU model feature for AP enabled
      (e.g., -cpu host,ap=on).

To hot unplug a vfio-ap device, the QEMU device-del function may be used:

   (qemu) device_del vfio-ap,sysfsdev=$path-to-mdev

   Where $path-to-mdev is the absolute path to the mediated matrix device
   specified when the vfio-ap device was attached to the virtual machine's
   ap-bus.

   A vfio-ap device can be hot unplugged only if:

   1. A vfio-ap device has been attached to the virtual machine's ap-abus
      either via the QEMU command line or a prior hot plug action. 

   2. The guest was started with the CPU model feature for AP enabled
      (e.g., -cpu host,ap=on).

Tony Krowiak (2):
  s390x/vfio-ap: Implement hot plug/unplug of vfio-ap device
  s390x/vfio-ap: document hot plug/unplug of vfio-ap device

 docs/vfio-ap.txt     | 58 +++++++++++++++++++++++++++++++++++++++++++++++-----
 hw/s390x/ap-bridge.c | 12 ++++++++++-
 hw/vfio/ap.c         |  2 +-
 3 files changed, 65 insertions(+), 7 deletions(-)

-- 
Changes: v2==>v3
* Split documentation changes into a separate patch
* Grammatical changes recommended by Connie
2.7.4