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    Subject[PATCH v5 12/13] 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.vnet.ibm.com>
    Signed-off-by: Tony Krowiak <akrowiak@linux.vnet.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 8866b0e..01a036f 100644
    --- a/drivers/s390/crypto/vfio_ap_ops.c
    +++ b/drivers/s390/crypto/vfio_ap_ops.c
    @@ -113,6 +113,48 @@ 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 ssize_t name_show(struct kobject *kobj, struct device *dev, char *buf)
    {
    return sprintf(buf, "%s\n", VFIO_AP_MDEV_NAME_HWVIRT);
    @@ -841,6 +883,7 @@ 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
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