Re: [qemu-s390x] [PATCH v2 0/2] s390x/vfio-ap: hot plug/unplug vfio-ap device

[Tony Krowiak]

On 2/18/19 12:59 PM, Tony Krowiak wrote:


PLEASE IGNORE THIS PATCH SERIES. A v3 VERSION IS FORTHCOMING. VERSION
v2 has already been posted and reviewed.

> This patch series introduces hot plug/unplug of a vfio-ap device.
>
> A vfio-ap device can be hot plugged only if:
>
> 1. The guest does not yet have a vfio-ap device (only one is allowed
>     per guest)
>
> 2. The guest was started with the following CPU model features enabled:
>     * ap=on
>     * apft=on
>
> 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 $path-to-mdev is the absolute path to the mediated matrix device
>     to be used to configure the guest's AP device matrix.
>
> A vfio-ap device can be hot unplugged only if:
>
> 1. The guest was started with a vfio-ap device configured for it:
>
>     -device vfio-ap,sysfsdev=$path-to-mdev
>
> 2. The guest was started with the following CPU model features enabled:
>     * 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(-)