On 07/04/2018 01:24 PM, Cornelia Huck wrote:
On Fri, 29 Jun 2018 18:48:02 -0400
Tony Krowiak <akrow...@linux.vnet.ibm.com> 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 <akrow...@linux.vnet.ibm.com>
Signed-off-by: Tony Krowiak <akrow...@linux.ibm.com>
Nit: You may want to decide one address or the other :)
Unintentional .... I'll correct it.
---
MAINTAINERS | 1 +
default-configs/s390x-softmmu.mak | 1 +
hw/vfio/Makefile.objs | 1 +
hw/vfio/ap.c | 183 +++++++++++++++++++++++++++++++++++++
include/hw/vfio/vfio-common.h | 1 +
5 files changed, 187 insertions(+), 0 deletions(-)
create mode 100644 hw/vfio/ap.c
No complaints about the code from me.
I like no complaints:)
