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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>
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@ -152,6 +152,64 @@ void vfio_df_unbind_iommufd(struct vfio_device_file *df)
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vfio_device_unblock_group(device);
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}
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int vfio_df_ioctl_attach_pt(struct vfio_device_file *df,
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struct vfio_device_attach_iommufd_pt __user *arg)
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{
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struct vfio_device *device = df->device;
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struct vfio_device_attach_iommufd_pt attach;
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unsigned long minsz;
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int ret;
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minsz = offsetofend(struct vfio_device_attach_iommufd_pt, pt_id);
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if (copy_from_user(&attach, arg, minsz))
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return -EFAULT;
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if (attach.argsz < minsz || attach.flags)
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return -EINVAL;
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mutex_lock(&device->dev_set->lock);
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ret = device->ops->attach_ioas(device, &attach.pt_id);
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if (ret)
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goto out_unlock;
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if (copy_to_user(&arg->pt_id, &attach.pt_id, sizeof(attach.pt_id))) {
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ret = -EFAULT;
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goto out_detach;
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}
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mutex_unlock(&device->dev_set->lock);
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return 0;
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out_detach:
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device->ops->detach_ioas(device);
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out_unlock:
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mutex_unlock(&device->dev_set->lock);
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return ret;
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}
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int vfio_df_ioctl_detach_pt(struct vfio_device_file *df,
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struct vfio_device_detach_iommufd_pt __user *arg)
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{
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struct vfio_device *device = df->device;
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struct vfio_device_detach_iommufd_pt detach;
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unsigned long minsz;
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minsz = offsetofend(struct vfio_device_detach_iommufd_pt, flags);
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if (copy_from_user(&detach, arg, minsz))
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return -EFAULT;
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if (detach.argsz < minsz || detach.flags)
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return -EINVAL;
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mutex_lock(&device->dev_set->lock);
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device->ops->detach_ioas(device);
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mutex_unlock(&device->dev_set->lock);
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return 0;
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}
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static char *vfio_device_devnode(const struct device *dev, umode_t *mode)
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{
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return kasprintf(GFP_KERNEL, "vfio/devices/%s", dev_name(dev));
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@ -266,6 +266,11 @@ vfio_iommufd_compat_attach_ioas(struct vfio_device *device,
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}
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#endif
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int vfio_df_ioctl_attach_pt(struct vfio_device_file *df,
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struct vfio_device_attach_iommufd_pt __user *arg);
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int vfio_df_ioctl_detach_pt(struct vfio_device_file *df,
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struct vfio_device_detach_iommufd_pt __user *arg);
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#if IS_ENABLED(CONFIG_VFIO_DEVICE_CDEV)
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void vfio_init_device_cdev(struct vfio_device *device);
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@ -1162,6 +1162,19 @@ static long vfio_device_fops_unl_ioctl(struct file *filep,
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if (ret)
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return ret;
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/* cdev only ioctls */
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if (IS_ENABLED(CONFIG_VFIO_DEVICE_CDEV) && !df->group) {
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switch (cmd) {
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case VFIO_DEVICE_ATTACH_IOMMUFD_PT:
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ret = vfio_df_ioctl_attach_pt(df, uptr);
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goto out;
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case VFIO_DEVICE_DETACH_IOMMUFD_PT:
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ret = vfio_df_ioctl_detach_pt(df, uptr);
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goto out;
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}
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}
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switch (cmd) {
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case VFIO_DEVICE_FEATURE:
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ret = vfio_ioctl_device_feature(device, uptr);
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@ -1174,7 +1187,7 @@ static long vfio_device_fops_unl_ioctl(struct file *filep,
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ret = device->ops->ioctl(device, cmd, arg);
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break;
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}
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out:
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vfio_device_pm_runtime_put(device);
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return ret;
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}
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@ -924,6 +924,50 @@ struct vfio_device_bind_iommufd {
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#define VFIO_DEVICE_BIND_IOMMUFD _IO(VFIO_TYPE, VFIO_BASE + 18)
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/*
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* VFIO_DEVICE_ATTACH_IOMMUFD_PT - _IOW(VFIO_TYPE, VFIO_BASE + 19,
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* struct vfio_device_attach_iommufd_pt)
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* @argsz: User filled size of this data.
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* @flags: Must be 0.
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* @pt_id: Input the target id which can represent an ioas or a hwpt
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* allocated via iommufd subsystem.
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* Output the input ioas id or the attached hwpt id which could
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* be the specified hwpt itself or a hwpt automatically created
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* for the specified ioas by kernel during the attachment.
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*
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* Associate the device with an address space within the bound iommufd.
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* Undo by VFIO_DEVICE_DETACH_IOMMUFD_PT or device fd close. This is only
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* allowed on cdev fds.
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*
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* Return: 0 on success, -errno on failure.
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*/
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struct vfio_device_attach_iommufd_pt {
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__u32 argsz;
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__u32 flags;
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__u32 pt_id;
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};
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#define VFIO_DEVICE_ATTACH_IOMMUFD_PT _IO(VFIO_TYPE, VFIO_BASE + 19)
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/*
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* VFIO_DEVICE_DETACH_IOMMUFD_PT - _IOW(VFIO_TYPE, VFIO_BASE + 20,
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* struct vfio_device_detach_iommufd_pt)
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* @argsz: User filled size of this data.
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* @flags: Must be 0.
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*
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* Remove the association of the device and its current associated address
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* space. After it, the device should be in a blocking DMA state. This is only
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* allowed on cdev fds.
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*
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* Return: 0 on success, -errno on failure.
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*/
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struct vfio_device_detach_iommufd_pt {
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__u32 argsz;
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__u32 flags;
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};
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#define VFIO_DEVICE_DETACH_IOMMUFD_PT _IO(VFIO_TYPE, VFIO_BASE + 20)
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/*
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* Provide support for setting a PCI VF Token, which is used as a shared
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* secret between PF and VF drivers. This feature may only be set on a
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