Re: [PATCH v4 3/8] HostIOMMUDevice: Introduce get_iova_ranges callback

["Cédric Le Goater" <clg@redhat.com>]

On 6/14/24 11:52 AM, Eric Auger wrote:
> Introduce a new HostIOMMUDevice callback that allows to
> retrieve the usable IOVA ranges.
> 
> Implement this callback in the legacy VFIO and IOMMUFD VFIO
> host iommu devices. This relies on the VFIODevice agent's
> base container iova_ranges resource.
> 
> Signed-off-by: Eric Auger <eric.auger@redhat.com>
> Reviewed-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
> 
> ---
> 
> v2 -> v3:
> - add g_assert(vdev)
> ---
>   include/sysemu/host_iommu_device.h |  8 ++++++++
>   hw/vfio/container.c                | 16 ++++++++++++++++
>   hw/vfio/iommufd.c                  | 16 ++++++++++++++++
>   3 files changed, 40 insertions(+)
> 
> diff --git a/include/sysemu/host_iommu_device.h b/include/sysemu/host_iommu_device.h
> index 3e5f058e7b..40e0fa13ef 100644
> --- a/include/sysemu/host_iommu_device.h
> +++ b/include/sysemu/host_iommu_device.h
> @@ -80,6 +80,14 @@ struct HostIOMMUDeviceClass {
>        * i.e., HOST_IOMMU_DEVICE_CAP_AW_BITS.
>        */
>       int (*get_cap)(HostIOMMUDevice *hiod, int cap, Error **errp);
> +    /**
> +     * @get_iova_ranges: Return the list of usable iova_ranges along with
> +     * @hiod Host IOMMU device
> +     *
> +     * @hiod: handle to the host IOMMU device
> +     * @errp: error handle
> +     */
> +    GList* (*get_iova_ranges)(HostIOMMUDevice *hiod, Error **errp);
>   };
>   
>   /*
> diff --git a/hw/vfio/container.c b/hw/vfio/container.c
> index b728b978a2..c48749c089 100644
> --- a/hw/vfio/container.c
> +++ b/hw/vfio/container.c
> @@ -1164,12 +1164,28 @@ static int hiod_legacy_vfio_get_cap(HostIOMMUDevice *hiod, int cap,
>       }
>   }
>   
> +static GList *
> +hiod_legacy_vfio_get_iova_ranges(HostIOMMUDevice *hiod, Error **errp)
> +{
> +    VFIODevice *vdev = hiod->agent;
> +    GList *l = NULL;
> +
> +    g_assert(vdev);
> +
> +    if (vdev->bcontainer) {
> +        l = g_list_copy(vdev->bcontainer->iova_ranges);
> +    }
> +
> +    return l;
> +}
> +
>   static void hiod_legacy_vfio_class_init(ObjectClass *oc, void *data)
>   {
>       HostIOMMUDeviceClass *hioc = HOST_IOMMU_DEVICE_CLASS(oc);
>   
>       hioc->realize = hiod_legacy_vfio_realize;
>       hioc->get_cap = hiod_legacy_vfio_get_cap;
> +    hioc->get_iova_ranges = hiod_legacy_vfio_get_iova_ranges;
>   };
>   
>   static const TypeInfo types[] = {
> diff --git a/hw/vfio/iommufd.c b/hw/vfio/iommufd.c
> index dbdae1adbb..e502081c2a 100644
> --- a/hw/vfio/iommufd.c
> +++ b/hw/vfio/iommufd.c
> @@ -645,11 +645,27 @@ static bool hiod_iommufd_vfio_realize(HostIOMMUDevice *hiod, void *opaque,
>       return true;
>   }
>   
> +static GList *
> +hiod_iommufd_vfio_get_iova_ranges(HostIOMMUDevice *hiod, Error **errp)
> +{
> +    VFIODevice *vdev = hiod->agent;
> +    GList *l = NULL;
> +
> +    g_assert(vdev);
> +
> +    if (vdev->bcontainer) {
> +        l = g_list_copy(vdev->bcontainer->iova_ranges);
> +    }
> +
> +    return l;
> +}

May be introduce a common vfio_container_get_iova_ranges() to be called from
the get_iova_ranges() handlers ?


Thanks,

C.


>   static void hiod_iommufd_vfio_class_init(ObjectClass *oc, void *data)
>   {
>       HostIOMMUDeviceClass *hiodc = HOST_IOMMU_DEVICE_CLASS(oc);
>   
>       hiodc->realize = hiod_iommufd_vfio_realize;
> +    hiodc->get_iova_ranges = hiod_iommufd_vfio_get_iova_ranges;
>   };
>   
>   static const TypeInfo types[] = {