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


From: Tony Krowiak
Subject: Re: [Qemu-devel] [PATCH v3 0/2] s390x/vfio-ap: hot plug/unplug vfio-ap device
Date: Mon, 11 Mar 2019 10:37:14 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.2.1

On 2/25/19 7:42 AM, Cornelia Huck wrote:
On Mon, 18 Feb 2019 14:49:55 -0500
Tony Krowiak <address@hidden> wrote:

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(-)


In the meantime, the signature of qbus_set_hotplug_handler() has
changed to take an Object instead of a DeviceState, but I just went
ahead and did that trivial change myself.

Thanks, applied.

Thanks Connie.






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