Re: [qemu-s390x] [PATCH v8 5/6] s390x/vfio: ap: Introduce VFIO AP device

[Cornelia Huck]

On Wed, 12 Sep 2018 16:08:19 -0400
Tony Krowiak <address@hidden> wrote:

> Introduces a VFIO based AP device. The device is defined via
> the QEMU command line by specifying:
> 
>     -device vfio-ap,sysfsdev=<path-to-mediated-matrix-device>
> 
> There may be only one vfio-ap device configured for a guest.
> 
> The mediated matrix device is created by the VFIO AP device
> driver by writing a UUID to a sysfs attribute file (see
> docs/vfio-ap.txt). The mediated matrix device will be named
> after the UUID. Symbolic links to the $uuid are created in
> many places, so the path to the mediated matrix device $uuid
> can be specified in any of the following ways:
> 
> /sys/devices/vfio_ap/matrix/$uuid
> /sys/devices/vfio_ap/matrix/mdev_supported_types/vfio_ap-passthrough/devices/$uuid
> /sys/bus/mdev/devices/$uuid
> /sys/bus/mdev/drivers/vfio_mdev/$uuid
> 
> When the vfio-ap device is realized, it acquires and opens the
> VFIO iommu group to which the mediated matrix device is
> bound. This causes a VFIO group notification event to be
> signaled. The vfio_ap device driver's group notification
> handler will get called at which time the device driver
> will configure the the AP devices to which the guest will
> be granted access.
> 
> Signed-off-by: Tony Krowiak <address@hidden>
> ---
>  MAINTAINERS                       |    1 +
>  default-configs/s390x-softmmu.mak |    1 +
>  hw/vfio/Makefile.objs             |    1 +
>  hw/vfio/ap.c                      |  186 
> +++++++++++++++++++++++++++++++++++++
>  include/hw/vfio/vfio-common.h     |    1 +
>  5 files changed, 190 insertions(+), 0 deletions(-)
>  create mode 100644 hw/vfio/ap.c

> diff --git a/hw/vfio/ap.c b/hw/vfio/ap.c
> new file mode 100644
> index 0000000..ae8d79c
> --- /dev/null
> +++ b/hw/vfio/ap.c
> @@ -0,0 +1,186 @@
> +/*
> + * VFIO based AP matrix device assignment
> + *
> + * Copyright 2018 IBM Corp.
> + * Author(s): Tony Krowiak <address@hidden>

Maybe use the short version of your mail address here as well?

> + *            Halil Pasic <address@hidden>
> + *
> + * This work is licensed under the terms of the GNU GPL, version 2 or (at
> + * your option) any later version. See the COPYING file in the top-level
> + * directory.
> + */