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s390: vfio-ap: implement VFIO_DEVICE_GET_INFO ioctl

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Adds support for the VFIO_DEVICE_GET_INFO ioctl to the VFIO
AP Matrix device driver. This is a minimal implementation,
as vfio-ap does not use I/O regions.

Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com>
Reviewed-by: Pierre Morel <pmorel@linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.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>
Message-Id: <20180925231641.4954-13-akrowiak@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Tony Krowiak 2018-09-25 19:16:27 -04:00 committed by Christian Borntraeger
parent 258287c994
commit e06670c5fe
2 changed files with 39 additions and 0 deletions
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38
drivers/s390/crypto/vfio_ap_ops.c
View File

@ -855,6 +855,43 @@ 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,
@ -863,6 +900,7 @@ static const struct mdev_parent_ops vfio_ap_matrix_ops = {
.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)

1
include/uapi/linux/vfio.h
View File

@ -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 */
};