Re: [PATCH v2 3/4] vfio/iommufd: Implement [at|de]tach_hwpt handlers

[Eric Auger <eric.auger@redhat.com>]

On 5/30/25 11:35 AM, Zhenzhong Duan wrote:
> Implement [at|de]tach_hwpt handlers in VFIO subsystem. vIOMMU
> utilizes them to attach to or detach from hwpt on host side.
>
> Signed-off-by: Yi Liu <yi.l.liu@intel.com>
> Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
> Reviewed-by: Cédric Le Goater <clg@redhat.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>

Eric
> ---
>  hw/vfio/iommufd.c | 22 ++++++++++++++++++++++
>  1 file changed, 22 insertions(+)
>
> diff --git a/hw/vfio/iommufd.c b/hw/vfio/iommufd.c
> index 5fde2b633a..d661737c17 100644
> --- a/hw/vfio/iommufd.c
> +++ b/hw/vfio/iommufd.c
> @@ -810,6 +810,24 @@ static void vfio_iommu_iommufd_class_init(ObjectClass *klass, const void *data)
>      vioc->query_dirty_bitmap = iommufd_query_dirty_bitmap;
>  };
>  
> +static bool
> +host_iommu_device_iommufd_vfio_attach_hwpt(HostIOMMUDeviceIOMMUFD *idev,
> +                                           uint32_t hwpt_id, Error **errp)
> +{
> +    VFIODevice *vbasedev = HOST_IOMMU_DEVICE(idev)->agent;
> +
> +    return !iommufd_cdev_attach_ioas_hwpt(vbasedev, hwpt_id, errp);
> +}
> +
> +static bool
> +host_iommu_device_iommufd_vfio_detach_hwpt(HostIOMMUDeviceIOMMUFD *idev,
> +                                           Error **errp)
> +{
> +    VFIODevice *vbasedev = HOST_IOMMU_DEVICE(idev)->agent;
> +
> +    return iommufd_cdev_detach_ioas_hwpt(vbasedev, errp);
> +}
> +
>  static bool hiod_iommufd_vfio_realize(HostIOMMUDevice *hiod, void *opaque,
>                                        Error **errp)
>  {
> @@ -864,10 +882,14 @@ hiod_iommufd_vfio_get_page_size_mask(HostIOMMUDevice *hiod)
>  static void hiod_iommufd_vfio_class_init(ObjectClass *oc, const void *data)
>  {
>      HostIOMMUDeviceClass *hiodc = HOST_IOMMU_DEVICE_CLASS(oc);
> +    HostIOMMUDeviceIOMMUFDClass *idevc = HOST_IOMMU_DEVICE_IOMMUFD_CLASS(oc);
>  
>      hiodc->realize = hiod_iommufd_vfio_realize;
>      hiodc->get_iova_ranges = hiod_iommufd_vfio_get_iova_ranges;
>      hiodc->get_page_size_mask = hiod_iommufd_vfio_get_page_size_mask;
> +
> +    idevc->attach_hwpt = host_iommu_device_iommufd_vfio_attach_hwpt;
> +    idevc->detach_hwpt = host_iommu_device_iommufd_vfio_detach_hwpt;
>  };
>  
>  static const TypeInfo types[] = {