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vfio: Add get_region_info_caps op

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This op does the copy to/from user for the info and can return back
a cap chain through a vfio_info_cap * result.

Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Pranjal Shrivastava <praan@google.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/15-v2-2a9e24d62f1b+e10a-vfio_get_region_info_op_jgg@nvidia.com
Signed-off-by: Alex Williamson <alex@shazbot.org>
This commit is contained in:
Jason Gunthorpe
2025-11-07 13:41:31 -04:00
committed by Alex Williamson
parent f978595038
commit 775f726a74
2 changed files with 56 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

56
drivers/vfio/vfio_main.c
View File

@@ -1259,6 +1259,57 @@ static int vfio_ioctl_device_feature(struct vfio_device *device,
}
}
static long vfio_get_region_info(struct vfio_device *device,
struct vfio_region_info __user *arg)
{
unsigned long minsz = offsetofend(struct vfio_region_info, offset);
struct vfio_region_info info = {};
struct vfio_info_cap caps = {};
int ret;
if (copy_from_user(&info, arg, minsz))
return -EFAULT;
if (info.argsz < minsz)
return -EINVAL;
if (device->ops->get_region_info_caps) {
ret = device->ops->get_region_info_caps(device, &info, &caps);
if (ret)
goto out_free;
if (caps.size) {
info.flags |= VFIO_REGION_INFO_FLAG_CAPS;
if (info.argsz < sizeof(info) + caps.size) {
info.argsz = sizeof(info) + caps.size;
info.cap_offset = 0;
} else {
vfio_info_cap_shift(&caps, sizeof(info));
if (copy_to_user(arg + 1, caps.buf,
caps.size)) {
ret = -EFAULT;
goto out_free;
}
info.cap_offset = sizeof(info);
}
}
if (copy_to_user(arg, &info, minsz)) {
ret = -EFAULT;
goto out_free;
}
} else if (device->ops->get_region_info) {
ret = device->ops->get_region_info(device, arg);
if (ret)
return ret;
} else {
return -EINVAL;
}
out_free:
kfree(caps.buf);
return ret;
}
static long vfio_device_fops_unl_ioctl(struct file *filep,
unsigned int cmd, unsigned long arg)
{
@@ -1297,10 +1348,7 @@ static long vfio_device_fops_unl_ioctl(struct file *filep,
break;
case VFIO_DEVICE_GET_REGION_INFO:
if (unlikely(!device->ops->get_region_info))
ret = -EINVAL;
else
ret = device->ops->get_region_info(device, uptr);
ret = vfio_get_region_info(device, uptr);
break;
default:

4
include/linux/vfio.h
View File

@@ -21,6 +21,7 @@ struct kvm;
struct iommufd_ctx;
struct iommufd_device;
struct iommufd_access;
struct vfio_info_cap;
/*
* VFIO devices can be placed in a set, this allows all devices to share this
@@ -134,6 +135,9 @@ struct vfio_device_ops {
unsigned long arg);
int (*get_region_info)(struct vfio_device *vdev,
struct vfio_region_info __user *arg);
int (*get_region_info_caps)(struct vfio_device *vdev,
struct vfio_region_info *info,
struct vfio_info_cap *caps);
int (*mmap)(struct vfio_device *vdev, struct vm_area_struct *vma);
void (*request)(struct vfio_device *vdev, unsigned int count);
int (*match)(struct vfio_device *vdev, char *buf);