Re: [Intel-gfx] [PATCH v7 8/9] vfio/pci: Extend VFIO_DEVICE_GET_PCI_HOT_RESET_INFO for vfio device cdev

Jason Gunthorpe
2023-06-13T11:47:05Z

On Fri, Jun 02, 2023 at 05:15:14AM -0700, Yi Liu wrote:
> +/*
> + * Return devid for a device which is affected by hot-reset.
> + * - valid devid > 0 for the device that is bound to the input
> + * iommufd_ctx.
> + * - devid == VFIO_PCI_DEVID_OWNED for the device that has not
> + * been bound to any iommufd_ctx but other device within its
> + * group has been bound to the input iommufd_ctx.
> + * - devid == VFIO_PCI_DEVID_NOT_OWNED for others. e.g. device
> + * is bound to other iommufd_ctx etc.
> + */
> +int vfio_iommufd_device_hot_reset_devid(struct vfio_device *vdev,
> + struct iommufd_ctx *ictx)
> +{
> + struct iommu_group *group;
> + int devid;
> +
> + if (vfio_iommufd_device_ictx(vdev) == ictx)
> + return vfio_iommufd_device_id(vdev);
> +
> + group = iommu_group_get(vdev->dev);
> + if (!group)
> + return VFIO_PCI_DEVID_NOT_OWNED;
> +
> + if (iommufd_ctx_has_group(ictx, group))
> + devid = VFIO_PCI_DEVID_OWNED;
> + else
> + devid = VFIO_PCI_DEVID_NOT_OWNED;
> +
> + iommu_group_put(group);
> +
> + return devid;
> +}
> +EXPORT_SYMBOL_GPL(vfio_iommufd_device_hot_reset_devid);

This function really should not be in the core iommufd.c file - it is
a purely vfio-pci function - why did you have to place it here?

Jason