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Subject[PATCH v6 17/21] s390: vfio-ap: implement VFIO_DEVICE_GET_INFO ioctl
Date
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 <pmorel@linux.ibm.com>
Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com>
---
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 bc05d40..79ac0d4 100644
--- a/drivers/s390/crypto/vfio_ap_ops.c
+++ b/drivers/s390/crypto/vfio_ap_ops.c
@@ -1114,6 +1114,48 @@ static void vfio_ap_mdev_release(struct mdev_device *mdev)
module_put(THIS_MODULE);
}

+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_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_MODULE_NAME, cmd);
+ ret = -EOPNOTSUPP;
+ break;
+ }
+
+ return ret;
+}
+
static const struct mdev_parent_ops vfio_ap_matrix_ops = {
.owner = THIS_MODULE,
.supported_type_groups = vfio_ap_mdev_type_groups,
@@ -1122,6 +1164,7 @@ static void vfio_ap_mdev_release(struct mdev_device *mdev)
.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_dev *matrix_dev)
--
1.7.1
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