From mboxrd@z Thu Jan 1 00:00:00 1970 From: Cornelia Huck Subject: Re: [PATCH v9 09/22] s390: vfio-ap: register matrix device with VFIO mdev framework Date: Tue, 14 Aug 2018 13:19:29 +0200 Message-ID: <20180814131929.37d4b530.cohuck@redhat.com> References: <1534196899-16987-1-git-send-email-akrowiak@linux.vnet.ibm.com> <1534196899-16987-10-git-send-email-akrowiak@linux.vnet.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1534196899-16987-10-git-send-email-akrowiak@linux.vnet.ibm.com> Sender: linux-kernel-owner@vger.kernel.org List-Archive: List-Post: To: Tony Krowiak Cc: linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, freude@de.ibm.com, schwidefsky@de.ibm.com, heiko.carstens@de.ibm.com, borntraeger@de.ibm.com, kwankhede@nvidia.com, bjsdjshi@linux.vnet.ibm.com, pbonzini@redhat.com, alex.williamson@redhat.com, pmorel@linux.vnet.ibm.com, alifm@linux.vnet.ibm.com, mjrosato@linux.vnet.ibm.com, jjherne@linux.vnet.ibm.com, thuth@redhat.com, pasic@linux.vnet.ibm.com, berrange@redhat.com, fiuczy@linux.vnet.ibm.com, buendgen@de.ibm.com, frankja@linux.ibm.com, Tony Krowiak List-ID: On Mon, 13 Aug 2018 17:48:06 -0400 Tony Krowiak wrote: > From: Tony Krowiak > > Registers the matrix device created by the VFIO AP device > driver with the VFIO mediated device framework. > Registering the matrix device will create the sysfs > structures needed to create mediated matrix devices > each of which will be used to configure the AP matrix > for a guest and connect it to the VFIO AP device driver. > > Registering the matrix device with the VFIO mediated device > framework will create the following sysfs structures: > > /sys/devices/vfio_ap/matrix/ > ...... [mdev_supported_types] > ......... [vfio_ap-passthrough] > ............ create > > To create a mediated device for the AP matrix device, write a UUID > to the create file: > > uuidgen > create > > A symbolic link to the mediated device's directory will be created in the > devices subdirectory named after the generated $uuid: > > /sys/devices/vfio_ap/matrix/ > ...... [mdev_supported_types] > ......... [vfio_ap-passthrough] > ............ [devices] > ............... [$uuid] > > A symbolic link to the mediated device will also be created > in the vfio_ap matrix's directory: > > /sys/devices/vfio_ap/matrix/[$uuid] > > Signed-off-by: Tony Krowiak > Reviewed-by: Halil Pasic > Tested-by: Michael Mueller > Tested-by: Farhan Ali > Signed-off-by: Christian Borntraeger > --- > MAINTAINERS | 1 + > drivers/s390/crypto/Makefile | 2 +- > drivers/s390/crypto/vfio_ap_drv.c | 23 ++++++ > drivers/s390/crypto/vfio_ap_ops.c | 124 +++++++++++++++++++++++++++++++++ > drivers/s390/crypto/vfio_ap_private.h | 45 ++++++++++++ > include/uapi/linux/vfio.h | 1 + > 6 files changed, 195 insertions(+), 1 deletions(-) > create mode 100644 drivers/s390/crypto/vfio_ap_ops.c > > diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c > new file mode 100644 > index 0000000..8018c2d > --- /dev/null > +++ b/drivers/s390/crypto/vfio_ap_ops.c > @@ -0,0 +1,124 @@ > +// SPDX-License-Identifier: GPL-2.0+ > +/* > + * Adjunct processor matrix VFIO device driver callbacks. > + * > + * Copyright IBM Corp. 2018 > + * > + * Author(s): Tony Krowiak > + * Halil Pasic > + * Pierre Morel > + */ > +#include > +#include > +#include > +#include > +#include > + > +#include "vfio_ap_private.h" > + > +#define VFIO_AP_MDEV_TYPE_HWVIRT "passthrough" > +#define VFIO_AP_MDEV_NAME_HWVIRT "VFIO AP Passthrough Device" > + > +static void vfio_ap_matrix_init(struct ap_config_info *info, > + struct ap_matrix *matrix) > +{ > + matrix->apm_max = info->apxa ? info->Na : 63; > + matrix->aqm_max = info->apxa ? info->Nd : 15; > + matrix->adm_max = info->apxa ? info->Nd : 15; > +} > + > +static int vfio_ap_mdev_create(struct kobject *kobj, struct mdev_device *mdev) > +{ > + struct ap_matrix_mdev *matrix_mdev; > + > + matrix_mdev = kzalloc(sizeof(*matrix_mdev), GFP_KERNEL); > + if (!matrix_mdev) > + return -ENOMEM; > + > + matrix_mdev->name = dev_name(mdev_dev(mdev)); > + vfio_ap_matrix_init(&matrix_dev.info, &matrix_mdev->matrix); > + mdev_set_drvdata(mdev, matrix_mdev); > + > + if (atomic_dec_if_positive(&matrix_dev.available_instances) < 0) { > + kfree(matrix_mdev); > + return -EPERM; > + } Maybe move this check to the top of the function? > + > + mutex_lock(&matrix_dev.lock); > + list_add(&matrix_mdev->list, &matrix_dev.mdev_list); > + mutex_unlock(&matrix_dev.lock); > + > + return 0; > +}