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    Subject[RFC 15/19] s390/zcrypt: introduce ioctl access to VFIO AP Matrix driver
    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.

    Signed-off-by: Tony Krowiak <akrowiak@linux.vnet.ibm.com>
    ---
    drivers/s390/crypto/vfio_ap_matrix_ops.c | 43 ++++++++++++++++++++++++++++++
    include/uapi/linux/vfio.h | 1 +
    2 files changed, 44 insertions(+), 0 deletions(-)

    diff --git a/drivers/s390/crypto/vfio_ap_matrix_ops.c b/drivers/s390/crypto/vfio_ap_matrix_ops.c
    index fd36074..74ea8db 100644
    --- a/drivers/s390/crypto/vfio_ap_matrix_ops.c
    +++ b/drivers/s390/crypto/vfio_ap_matrix_ops.c
    @@ -137,6 +137,48 @@ static void ap_matrix_mdev_release(struct mdev_device *mdev)
    &matrix_mdev->group_notifier);
    }

    +static int ap_matrix_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_MATRIX;
    + info.num_regions = 0;
    + info.num_irqs = 0;
    +
    + return copy_to_user((void __user *)arg, &info, minsz);
    +}
    +
    +static ssize_t ap_matrix_mdev_ioctl(struct mdev_device *mdev,
    + unsigned int cmd, unsigned long arg)
    +{
    + int ret;
    +
    + switch (cmd) {
    + case VFIO_DEVICE_GET_INFO:
    + ret = ap_matrix_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", AP_MATRIX_MDEV_NAME_HWVIRT);
    @@ -651,6 +693,7 @@ static DEVICE_ATTR(control_domains, 0644, ap_matrix_control_domains_show,
    .remove = ap_matrix_mdev_remove,
    .open = ap_matrix_mdev_open,
    .release = ap_matrix_mdev_release,
    + .ioctl = ap_matrix_mdev_ioctl,

    };

    diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
    index 743456f..08f1ab4 100644
    --- a/include/uapi/linux/vfio.h
    +++ b/include/uapi/linux/vfio.h
    @@ -199,6 +199,7 @@ struct vfio_device_info {
    #define VFIO_DEVICE_FLAGS_PLATFORM (1 << 2) /* vfio-platform device */
    #define VFIO_DEVICE_FLAGS_AMBA (1 << 3) /* vfio-amba device */
    #define VFIO_DEVICE_FLAGS_CCW (1 << 4) /* vfio-ccw device */
    +#define VFIO_DEVICE_FLAGS_AP_MATRIX (1 << 5) /* vfio-ap-matrix device */
    __u32 num_regions; /* Max region index + 1 */
    __u32 num_irqs; /* Max IRQ index + 1 */
    };
    --
    1.7.1
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