From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tony Krowiak Subject: [PATCH v3 13/14] s390: vfio-ap: implement VFIO_DEVICE_GET_INFO ioctl Date: Wed, 14 Mar 2018 14:25:53 -0400 Message-ID: <1521051954-25715-14-git-send-email-akrowiak@linux.vnet.ibm.com> References: <1521051954-25715-1-git-send-email-akrowiak@linux.vnet.ibm.com> Return-path: In-Reply-To: <1521051954-25715-1-git-send-email-akrowiak@linux.vnet.ibm.com> Sender: linux-kernel-owner@vger.kernel.org List-Archive: List-Post: To: linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: freude@de.ibm.com, schwidefsky@de.ibm.com, heiko.carstens@de.ibm.com, borntraeger@de.ibm.com, cohuck@redhat.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, akrowiak@linux.vnet.ibm.com List-ID: Introduces ioctl access to the VFIO AP Matrix device driver by implementing the VFIO_DEVICE_GET_INFO ioctl. This ioctl provides the VFIO AP Matrix device driver information to the guest machine. Reviewed-by: Pierre Morel Signed-off-by: Tony Krowiak --- drivers/s390/crypto/vfio_ap_ops.c | 43 +++++++++++++++++++++++++++++++++++++ 1 files changed, 43 insertions(+), 0 deletions(-) diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c index c7911da..7223a1c 100644 --- a/drivers/s390/crypto/vfio_ap_ops.c +++ b/drivers/s390/crypto/vfio_ap_ops.c @@ -101,6 +101,48 @@ static void vfio_ap_mdev_release(struct mdev_device *mdev) &matrix_mdev->group_notifier); } +static int vfio_ap_mdev_get_device_info(unsigned long arg) +{ + unsigned long minsz; + struct vfio_device_info info; + + minsz = offsetofend(struct vfio_device_info, num_irqs); + + if (copy_from_user(&info, (void __user *)arg, minsz)) + return -EFAULT; + + if (info.argsz < minsz) { + pr_err("%s: Argument size %u less than min size %li", + VFIO_AP_MATRIX_MODULE_NAME, info.argsz, minsz); + return -EINVAL; + } + + info.flags = VFIO_DEVICE_FLAGS_AP; + info.num_regions = 0; + info.num_irqs = 0; + + return copy_to_user((void __user *)arg, &info, minsz); +} + +static ssize_t vfio_ap_mdev_ioctl(struct mdev_device *mdev, + unsigned int cmd, unsigned long arg) +{ + int ret; + + switch (cmd) { + case VFIO_DEVICE_GET_INFO: + ret = vfio_ap_mdev_get_device_info(arg); + break; + default: + pr_err("%s: ioctl command %d is not a supported command", + VFIO_AP_MATRIX_MODULE_NAME, cmd); + ret = -EOPNOTSUPP; + break; + } + + return ret; +} + static ssize_t name_show(struct kobject *kobj, struct device *dev, char *buf) { return sprintf(buf, "%s\n", VFIO_AP_MDEV_NAME_HWVIRT); @@ -807,6 +849,7 @@ static ssize_t matrix_show(struct device *dev, struct device_attribute *attr, .remove = vfio_ap_mdev_remove, .open = vfio_ap_mdev_open, .release = vfio_ap_mdev_release, + .ioctl = vfio_ap_mdev_ioctl, }; int vfio_ap_mdev_register(struct ap_matrix *ap_matrix) -- 1.7.1