vfio: Add VFIO_DEVICE_[AT|DE]TACH_IOMMUFD_PT

This adds ioctl for userspace to attach device cdev fd to and detach
from IOAS/hw_pagetable managed by iommufd.

    VFIO_DEVICE_ATTACH_IOMMUFD_PT: attach vfio device to IOAS or hw_pagetable
				   managed by iommufd. Attach can be undo
				   by VFIO_DEVICE_DETACH_IOMMUFD_PT or device
				   fd close.
    VFIO_DEVICE_DETACH_IOMMUFD_PT: detach vfio device from the current attached
				   IOAS or hw_pagetable managed by iommufd.

Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Tested-by: Matthew Rosato <mjrosato@linux.ibm.com>
Tested-by: Yanting Jiang <yanting.jiang@intel.com>
Tested-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Tested-by: Terrence Xu <terrence.xu@intel.com>
Tested-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Link: https://lore.kernel.org/r/20230718135551.6592-24-yi.l.liu@intel.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Yi Liu 2023-07-18 06:55:48 -07:00 committed by Alex Williamson
parent 5fcc26969a
commit b290a05fd8
4 changed files with 121 additions and 1 deletions

View File

@ -152,6 +152,64 @@ void vfio_df_unbind_iommufd(struct vfio_device_file *df)
vfio_device_unblock_group(device);
}
int vfio_df_ioctl_attach_pt(struct vfio_device_file *df,
struct vfio_device_attach_iommufd_pt __user *arg)
{
struct vfio_device *device = df->device;
struct vfio_device_attach_iommufd_pt attach;
unsigned long minsz;
int ret;
minsz = offsetofend(struct vfio_device_attach_iommufd_pt, pt_id);
if (copy_from_user(&attach, arg, minsz))
return -EFAULT;
if (attach.argsz < minsz || attach.flags)
return -EINVAL;
mutex_lock(&device->dev_set->lock);
ret = device->ops->attach_ioas(device, &attach.pt_id);
if (ret)
goto out_unlock;
if (copy_to_user(&arg->pt_id, &attach.pt_id, sizeof(attach.pt_id))) {
ret = -EFAULT;
goto out_detach;
}
mutex_unlock(&device->dev_set->lock);
return 0;
out_detach:
device->ops->detach_ioas(device);
out_unlock:
mutex_unlock(&device->dev_set->lock);
return ret;
}
int vfio_df_ioctl_detach_pt(struct vfio_device_file *df,
struct vfio_device_detach_iommufd_pt __user *arg)
{
struct vfio_device *device = df->device;
struct vfio_device_detach_iommufd_pt detach;
unsigned long minsz;
minsz = offsetofend(struct vfio_device_detach_iommufd_pt, flags);
if (copy_from_user(&detach, arg, minsz))
return -EFAULT;
if (detach.argsz < minsz || detach.flags)
return -EINVAL;
mutex_lock(&device->dev_set->lock);
device->ops->detach_ioas(device);
mutex_unlock(&device->dev_set->lock);
return 0;
}
static char *vfio_device_devnode(const struct device *dev, umode_t *mode)
{
return kasprintf(GFP_KERNEL, "vfio/devices/%s", dev_name(dev));

View File

@ -266,6 +266,11 @@ vfio_iommufd_compat_attach_ioas(struct vfio_device *device,
}
#endif
int vfio_df_ioctl_attach_pt(struct vfio_device_file *df,
struct vfio_device_attach_iommufd_pt __user *arg);
int vfio_df_ioctl_detach_pt(struct vfio_device_file *df,
struct vfio_device_detach_iommufd_pt __user *arg);
#if IS_ENABLED(CONFIG_VFIO_DEVICE_CDEV)
void vfio_init_device_cdev(struct vfio_device *device);

View File

@ -1162,6 +1162,19 @@ static long vfio_device_fops_unl_ioctl(struct file *filep,
if (ret)
return ret;
/* cdev only ioctls */
if (IS_ENABLED(CONFIG_VFIO_DEVICE_CDEV) && !df->group) {
switch (cmd) {
case VFIO_DEVICE_ATTACH_IOMMUFD_PT:
ret = vfio_df_ioctl_attach_pt(df, uptr);
goto out;
case VFIO_DEVICE_DETACH_IOMMUFD_PT:
ret = vfio_df_ioctl_detach_pt(df, uptr);
goto out;
}
}
switch (cmd) {
case VFIO_DEVICE_FEATURE:
ret = vfio_ioctl_device_feature(device, uptr);
@ -1174,7 +1187,7 @@ static long vfio_device_fops_unl_ioctl(struct file *filep,
ret = device->ops->ioctl(device, cmd, arg);
break;
}
out:
vfio_device_pm_runtime_put(device);
return ret;
}

View File

@ -924,6 +924,50 @@ struct vfio_device_bind_iommufd {
#define VFIO_DEVICE_BIND_IOMMUFD _IO(VFIO_TYPE, VFIO_BASE + 18)
/*
* VFIO_DEVICE_ATTACH_IOMMUFD_PT - _IOW(VFIO_TYPE, VFIO_BASE + 19,
* struct vfio_device_attach_iommufd_pt)
* @argsz: User filled size of this data.
* @flags: Must be 0.
* @pt_id: Input the target id which can represent an ioas or a hwpt
* allocated via iommufd subsystem.
* Output the input ioas id or the attached hwpt id which could
* be the specified hwpt itself or a hwpt automatically created
* for the specified ioas by kernel during the attachment.
*
* Associate the device with an address space within the bound iommufd.
* Undo by VFIO_DEVICE_DETACH_IOMMUFD_PT or device fd close. This is only
* allowed on cdev fds.
*
* Return: 0 on success, -errno on failure.
*/
struct vfio_device_attach_iommufd_pt {
__u32 argsz;
__u32 flags;
__u32 pt_id;
};
#define VFIO_DEVICE_ATTACH_IOMMUFD_PT _IO(VFIO_TYPE, VFIO_BASE + 19)
/*
* VFIO_DEVICE_DETACH_IOMMUFD_PT - _IOW(VFIO_TYPE, VFIO_BASE + 20,
* struct vfio_device_detach_iommufd_pt)
* @argsz: User filled size of this data.
* @flags: Must be 0.
*
* Remove the association of the device and its current associated address
* space. After it, the device should be in a blocking DMA state. This is only
* allowed on cdev fds.
*
* Return: 0 on success, -errno on failure.
*/
struct vfio_device_detach_iommufd_pt {
__u32 argsz;
__u32 flags;
};
#define VFIO_DEVICE_DETACH_IOMMUFD_PT _IO(VFIO_TYPE, VFIO_BASE + 20)
/*
* Provide support for setting a PCI VF Token, which is used as a shared
* secret between PF and VF drivers. This feature may only be set on a