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    Subject[PATCH v9 16/22] s390: vfio-ap: implement VFIO_DEVICE_GET_INFO ioctl
    Date
    From: Tony Krowiak <akrowiak@linux.ibm.com>

    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.ibm.com>
    Reviewed-by: Pierre Morel <pmorel@linux.ibm.com>
    Acked-by: Halil Pasic <pasic@linux.ibm.com>
    Tested-by: Michael Mueller <mimu@linux.ibm.com>
    Tested-by: Farhan Ali <alifm@linux.ibm.com>
    Tested-by: Pierre Morel <pmorel@linux.ibm.com>
    Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
    ---
    drivers/s390/crypto/vfio_ap_ops.c | 38 +++++++++++++++++++++++++++++++++++++
    include/uapi/linux/vfio.h | 1 +
    2 files changed, 39 insertions(+), 0 deletions(-)

    diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
    index 280bd17..368b559 100644
    --- a/drivers/s390/crypto/vfio_ap_ops.c
    +++ b/drivers/s390/crypto/vfio_ap_ops.c
    @@ -794,6 +794,43 @@ 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)
    + 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:
    + 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,
    @@ -802,6 +839,7 @@ 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(void)
    diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
    index bfbe2be..f378b98 100644
    --- a/include/uapi/linux/vfio.h
    +++ b/include/uapi/linux/vfio.h
    @@ -200,6 +200,7 @@ 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 (1 << 5) /* vfio-ap device */
    __u32 num_regions; /* Max region index + 1 */
    __u32 num_irqs; /* Max IRQ index + 1 */
    };
    --
    1.7.1
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