From e06670c5fe3b3a55547e2caeaec34acfdb4885e3 Mon Sep 17 00:00:00 2001 From: Tony Krowiak Date: Tue, 25 Sep 2018 19:16:27 -0400 Subject: [PATCH] s390: vfio-ap: implement VFIO_DEVICE_GET_INFO ioctl 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 Reviewed-by: Pierre Morel Reviewed-by: Cornelia Huck Acked-by: Halil Pasic Tested-by: Michael Mueller Tested-by: Farhan Ali Tested-by: Pierre Morel Message-Id: <20180925231641.4954-13-akrowiak@linux.vnet.ibm.com> Signed-off-by: Christian Borntraeger --- drivers/s390/crypto/vfio_ap_ops.c | 38 +++++++++++++++++++++++++++++++ include/uapi/linux/vfio.h | 1 + 2 files changed, 39 insertions(+) diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c index 1fd0beefeda6..974cf06d8a5c 100644 --- a/drivers/s390/crypto/vfio_ap_ops.c +++ b/drivers/s390/crypto/vfio_ap_ops.c @@ -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) diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h index bfbe2be8f369..f378b9802d8b 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 */ };